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acs722 approximate scale 1:1 the allegro ? acs722 current sensor ic is an economical and precise solution for ac or dc current sensing in industrial, commercial, and communications systems. the small package is ideal for space constrained applications while also saving costs due to reduced board area. typical applications include motor control, load detection and management, switched-mode power supplies, and overcurrent fault protection. the device consists of a precise, low-offset, linear hall sensor circuit with a copper conduction path located near the surface of the die. applied current flowing through this copper conduction path generates a magnetic field which is sensed by the integrated hall ic and converted into a proportional voltage. device accuracy is optimized through the close proximity of the magnetic field to the hall transducer. a precise, proportional voltage is provided by the low-offset, chopper-stabilized bicmos hall ic, which includes allegros patented digital temperature compensation, resulting in extremely accurate performance over temperature. the output of the device has a positive slope when an increasing current flows through the primary copper conduction path (from pins 1 and 2, to pins 3 and 4), which is the path used for current sensing. the internal resistance of this conductive path is 0.65 m? typical, providing low power loss. the terminals of the conductive path are electrically isolated from the sensor leads (pins 5 through 8). this allows the acs722 current sensor ic to be used in high-side current sense applications without the use of high-side differential amplifiers or other costly isolation techniques. the acs722 is provided in a small, low profile surface mount soic8 package. the leadframe is plated with 100% matte tin, acs722-ds, rev. 2 ? patented integrated digital temperature compensation circuitry allows for near closed loop accuracy over temperature in an open loop sensor ? ul60950-1 (ed. 2) certified dielectric strength voltage = 2.4 kvrms basic isolation working voltage = 420 vpk/297 vrms ? industry-leading noise performance with greatly improved bandwidth through proprietary amplifier and filter design techniques ? pin-selectable band width: 80 khz for high bandwidth applications or 20 khz for low noise performance ? 0.65 m? primary conductor resistance for low power loss and high inrush current withstand capability ? small footprint, low-profile soic8 package suitable for space-constrained applications ? integrated shield virtually eliminates capacitive coupling from current conductor to die, greatly suppressing output noise due to high dv/dt transients ? 3 to 3.6 v, single supply operation high accuracy, galvanically isolated current sensor ic with small footprint soic8 package continued on the next page package: 8-pin soic (suff?ix lc) typical application p p p l c byp ass 0.1 f acs722 c 2 1 3 4 6 8 5 7 ip+ vcc ?i +i ip+ viout ip? ip? bw_sel gnd i the acs722 outputs an analog signal, v iout , that changes, proportionally, with the bidirectional ac or dc primary sensed current, i p , within the specified measurement range. the bw_sel pin can be used to select one of the two bandwidths to optimize the noise performance. grounding the bw_sel pin puts the part in the high bandwidth (80 khz) mode. continued on the next page cb certif?icate number: us-22334-a1-ul features and benefits description
2 selection guide part number i pr (a) sens(typ) at v cc = 3.3 v (mv/a) t a (c) packing 1 acs722llctr-05ab-t 2 5 264 -40 to 150 tape and reel, 3000 pieces per reel acs722llctr-10au-t 2 10 acs722llctr-10ab-t 2 10 132 acs722llctr-20au-t 2 20 acs722llctr-20ab-t 2 20 66 acs722llctr-40au-t 2 40 acs722llctr-40ab-t 2 40 33 1 contact allegro for additional packing options. 2 variant not intended for automotive applications. which is compatible with standard lead (pb) free printed circuit board assembly processes. internally, the device is pb-free, except for flip-chip high-temperature pb-based solder balls, currently exempt from rohs. the device is fully calibrated prior to shipment from the factory. description (continued) ? output voltage proportional to ac or dc current ? factory-trimmed sensitivity and quiescent output voltage for improved accuracy ? chopper stabilization results in extremely stable quiescent output voltage ? nearly zero magnetic hysteresis ? ratiometric output from supply voltage features and benefits (continued) high accuracy, galvanically isolated current sensor ic with small footprint soic8 package acs722 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
3 thermal characteristics characteristic symbol test conditions* value units package thermal resistance (junction to ambient) r ja mounted on the allegro 85-0593 evaluation board with 400 mm 2 of 4 oz. copper on each side, connected to pins 1 and 2, and to pins 3 and 4, with thermal vias connecting the layers. performance values include the power consumed by the pcb. 23 oc/w package thermal resistance (junction to lead) r jl mounted on the allegro asek 722 evaluation board. 5 oc/w *additional thermal information available on the allegro website. isolation characteristics characteristic symbol notes rating unit dielectric strength test voltage v iso agency type-tested for 60 seconds per ul 60950-1 (edition. 2). production tested at v iso for 1 second, in accordance with ul 60950-1 (edition. 2). 2400 v rms working voltage for basic isolation v wvbi maximum approved working voltage for basic (single) isolation according ul 60950-1 (edition 2). 420 v pk or vdc 297 v rms clearance d cl minimum distance through air from ip leads to signal leads. 3.9 mm creepage d cr minimum distance along package body from ip leads to signal leads. 3.9 mm absolute maximum ratings characteristic symbol notes rating units supply voltage v cc 6 v reverse supply voltage v rcc C0.1 v output voltage v iout 25 v reverse output voltage v riout C0.1 v operating ambient temperature t a range l C40 to 150 c junction temperature t j (max) 165 c storage temperature t stg C65 to 165 c specifications high accuracy, galvanically isolated current sensor ic with small footprint soic8 package acs722 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
4 dynamic of fset cancellation master current supply programming control eeprom and control logic of fset control sensitivity control t uned filter t emperature sensor hall current drive por to all subcircuits ip+ ip+ ip C ip C vcc viout gnd bw_sel functional block diagram high accuracy, galvanically isolated current sensor ic with small footprint soic8 package acs722 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
5 terminal list table number name description 1, 2 ip+ terminals for current being sensed; fused internally 3, 4 ipC terminals for current being sensed; fused internally 5 gnd signal ground terminal 6 bw_sel terminal for selecting 20 khz or 80 khz bandwidth 7 viout analog output signal 8 vcc device power supply terminal ip+ ip+ ip? ip? vcc viout bw_sel gnd 1 2 3 4 8 7 6 5 pin-out diagram pin-out diagram and terminal list high accuracy, galvanically isolated current sensor ic with small footprint soic8 package acs722 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
6 common electrical characteristics 1 : valid through the full range of t a = C40c to 150c , and at v cc = 3.3 v; unless otherwise specif?ied characteristic symbol test conditions min. typ. max. units supply voltage v cc 3 3.3 3.6 v supply current i cc v cc within v cc (min) and v cc (max) C 9 12 ma output capacitance load c l viout to gnd C C 10 nf output resistive load r l viout to gnd 4.7 C C k? primary conductor resistance r ip t a = 25c C 0.65 C m? magnetic coupling factor c f C 10 C g/a rise time t r i p = i p (max), t a = 25c, c l = 1 nf, bw_sel tied to gnd C 4 C s i p = i p (max), t a = 25c, c l = 1 nf, bw_sel tied to vcc C 17.5 C s propagation delay t pd i p = i p (max), t a = 25c, c l = 1 nf, bw_sel tied to gnd C 1 C s i p = i p (max), t a = 25c, c l = 1 nf, bw_sel tied to vcc C 5 C s response time t response i p = i p (max), t a = 25c, c l = 1 nf, bw_sel tied to gnd C 5 C s i p = i p (max), t a = 25c, c l = 1 nf, bw_sel tied to vcc C 22.5 C s internal bandwidth bwi small signal C3 db; c l = 1 nf, bw_sel tied to gnd C 80 C khz small signal C3 db; c l = 1nf, bw_sel tied to vcc C 20 C khz noise density i nd input referenced noise density; t a = 25c, c l = 1 nf C 150 C a (rms) / hz noise i n input referenced noise; bwi = 80 khz, t a = 25c, c l = 1 nf C 42 C ma (rms) input referenced noise; bwi = 20 khz, t a = 25c, c l = 1 nf C 21 C ma (rms) nonlinearity e lin through full range of i p C 1 % saturation voltage 2 v oh r l = 4.7 k?, t a = 25c v cc C 0.33 C C v v ol r l = 4.7 k?, t a = 25c C C 0.33 v power-on time t po output reaches 90% of steady-state level, t a = 25c, i p = i pr (max) applied C 64 C s 1 device may be operated at higher primary current levels, i p , ambient temperatures, t a , and internal leadframe temperatures, provided the maximum junction tem - perature, t j (max), is not exceeded. 2 the sensor ic will continue to respond to current beyond the range of i p until the high or low saturation voltage; however, the nonlinearity in this region will be worse than through the rest of the measurement range. high accuracy, galvanically isolated current sensor ic with small footprint soic8 package acs722 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
7 xllctr-5ab performance characteristics : t a range l, valid at t a = C?40c to 150c, v cc = 3.3 v, unless oth - erwise specif?ied characteristic symbol test conditions min. typ. max. units nominal performance current sensing range i pr C5 C 5 a sensitivity sens i pr (min) < i p < i pr (max) C 264 C mv/a zero current output voltage v iout(q) bidirectional; i p = 0 a C v cc x 0.5 C v accuracy performance sensitivity error e sens t a = 25c to 150c; measured at i p = i pr (max) C2 C 2 % t a = C40c to 25c; ; measured at i p = i pr (max) C 2.5 C % offset voltage 1 v oe i p = 0 a; t a = 25c to 150c C15 C 15 mv i p = 0 a; t a = -40c to 25c C 20 C mv total output error 2 e tot i p = i pr (max), t a = 25c to 150c C2.5 C 2.5 % i p = i pr (max), t a = C40c to 25c C 3 C % lifetime drift characteristics sensitivity error lifetime drift e sens_drift C 2 C % total output error lifetime drift e tot_drift C 2 C % 1 offset voltage does not incorporate any error due to external magnetic fields. see section: impact of external magnetic fields. 2 percentage of i p , with i p = i pr (max) high accuracy, galvanically isolated current sensor ic with small footprint soic8 package acs722 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
8 xllctr-10au performance characteristics : t a range l, valid at t a = C?40c to 150c, v cc = 3.3 v, unless otherwise specif?ied characteristic symbol test conditions min. typ. max. units nominal performance current sensing range i pr 0 C 10 a sensitivity sens i pr (min) < i p < i pr (max) C 264 C mv/a zero current output voltage v iout(q) unidirectional; i p = 0 a C v cc x 0.1 C v accuracy performance sensitivity error e sens t a = 25c to 150c; measured at i p = i pr (max) C2 C 2 % t a = C40c to 25c; ; measured at i p = i pr (max) C 2.5 C % offset voltage 1 v oe i p = 0 a; t a = 25c to 150c C15 C 15 mv i p = 0 a; t a = -40c to 25c C 20 C mv total output error 2 e tot i p = i pr (max), t a = 25c to 150c C2.5 C 2.5 % i p = i pr (max), t a = C40c to 25c C 3 C % lifetime drift characteristics sensitivity error lifetime drift e sens_drift C 2 C % total output error lifetime drift e tot_drift C 2 C % 1 offset voltage does not incorporate any error due to external magnetic fields. see section: impact of external magnetic fields. 2 percentage of i p , with i p = i pr (max) xllctr-10ab performance characteristics : t a range l, valid at t a = C?40c to 150c, v cc = 3.3 v, unless otherwise specif?ied characteristic symbol test conditions min. typ. max. units nominal performance current sensing range i pr C10 C 10 a sensitivity sens i pr (min) < i p < i pr (max) C 132 C mv/a zero current output voltage v iout(q) bidirectional; i p = 0 a C v cc x 0.5 C v accuracy performance sensitivity error e sens t a = 25c to 150c; measured at i p = i pr (max) C1.5 C 1.5 % t a = C40c to 25c; ; measured at i p = i pr (max) C 2 C % offset voltage 1 v oe i p = 0 a; t a = 25c to 150c C10 C 10 mv i p = 0 a; t a = -40c to 25c C 15 C mv total output error 2 e tot i p = i pr (max), t a = 25c to 150c C2 C 2 % i p = i pr (max), t a = C40c to 25c C 3 C % lifetime drift characteristics sensitivity error lifetime drift e sens_drift C 2 C % total output error lifetime drift e tot_drift C 2 C % 1 offset voltage does not incorporate any error due to external magnetic fields. see section: impact of external magnetic fields. 2 percentage of i p , with i p = i pr (max) high accuracy, galvanically isolated current sensor ic with small footprint soic8 package acs722 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
9 xllctr-20au performance characteristics : t a range l, valid at t a = C?40c to 150c, v cc = 3.3 v, unless otherwise specif?ied characteristic symbol test conditions min. typ. max. units nominal performance current sensing range i pr 0 C 20 a sensitivity sens i pr (min) < i p < i pr (max) C 132 C mv/a zero current output voltage v iout(q) unidirectional; i p = 0 a C v cc x 0.1 C v accuracy performance sensitivity error e sens t a = 25c to 150c; measured at i p = i pr (max) C1.5 C 1.5 % t a = C40c to 25c; ; measured at i p = i pr (max) C 2 C % offset voltage 1 v oe i p = 0 a; t a = 25c to 150c C10 C 10 mv i p = 0 a; t a = -40c to 25c C 15 C mv total output error 2 e tot i p = i pr (max), t a = 25c to 150c C2 C 2 % i p = i pr (max), t a = C40c to 25c C 3 C % lifetime drift characteristics sensitivity error lifetime drift e sens_drift C 2 C % total output error lifetime drift e tot_drift C 2 C % 1 offset voltage does not incorporate any error due to external magnetic fields. see section: impact of external magnetic fields. 2 percentage of i p , with i p = i pr (max) xllctr-20ab performance characteristics : t a range l, valid at t a = C?40c to 150c, v cc = 3.3 v, unless otherwise specif?ied characteristic symbol test conditions min. typ. max. units nominal performance current sensing range i pr C20 C 20 a sensitivity sens i pr (min) < i p < i pr (max) C 66 C mv/a zero current output voltage v iout(q) bidirectional; i p = 0 a C v cc x 0.5 C v accuracy performance sensitivity error e sens t a = 25c to 150c; measured at i p = i pr (max) C1.5 C 1.5 % t a = C40c to 25c; ; measured at i p = i pr (max) C 2 C % offset voltage 1 v oe i p = 0 a; t a = 25c to 150c C10 C 10 mv i p = 0 a; t a = -40c to 25c C 15 C mv total output error 2 e tot i p = i pr (max), t a = 25c to 150c C2 C 2 % i p = i pr (max), t a = C40c to 25c C 3 C % lifetime drift characteristics sensitivity error lifetime drift e sens_drift C 2 C % total output error lifetime drift e tot_drift C 2 C % 1 offset voltage does not incorporate any error due to external magnetic fields. see section: impact of external magnetic fields. 2 percentage of i p , with i p = i pr (max) high accuracy, galvanically isolated current sensor ic with small footprint soic8 package acs722 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
10 xllctr-40au performance characteristics : t a range l, valid at t a = C?40c to 150c, v cc = 3.3 v, unless otherwise specif?ied characteristic symbol test conditions min. typ. max. units nominal performance current sensing range i pr 0 C 40 a sensitivity sens i pr (min) < i p < i pr (max) C 66 C mv/a zero current output voltage v iout(q) unidirectional; i p = 0 a C v cc x 0.1 C v accuracy performance sensitivity error e sens t a = 25c to 150c; measured at i p = i pr (max) C1.5 C 1.5 % t a = C40c to 25c; ; measured at i p = i pr (max) C 2 C % offset voltage 1 v oe i p = 0 a; t a = 25c to 150c C10 C 10 mv i p = 0 a; t a = -40c to 25c C 15 C mv total output error 2 e tot i p = i pr (max), t a = 25c to 150c C2 C 2 % i p = i pr (max), t a = C40c to 25c C 3 C % lifetime drift characteristics sensitivity error lifetime drift e sens_drift C 2 C % total output error lifetime drift e tot_drift C 2 C % 1 offset voltage does not incorporate any error due to external magnetic fields. see section: impact of external magnetic fields. 2 percentage of i p , with i p = i pr (max) xllctr-40ab performance characteristics : t a range l, valid at t a = C?40c to 150c, v cc = 3.3 v, unless otherwise specif?ied characteristic symbol test conditions min. typ. max. units nominal performance current sensing range i pr C40 C 40 a sensitivity sens i pr (min) < i p < i pr (max) C 33 C mv/a zero current output voltage v iout(q) bidirectional; i p = 0 a C v cc x 0.5 C v accuracy performance sensitivity error e sens t a = 25c to 150c; measured at i p = i pr (max) C1.5 C 1.5 % t a = C40c to 25c; ; measured at i p = i pr (max) C 2 C % offset voltage 1 v oe i p = 0 a; t a = 25c to 150c C10 C 10 mv i p = 0 a; t a = -40c to 25c C 15 C mv total output error 2 e tot i p = i pr (max), t a = 25c to 150c C2 C 2 % i p = i pr (max), t a = C40c to 25c C 3 C % lifetime drift characteristics sensitivity error lifetime drift e sens_drift C 2 C % total output error lifetime drift e tot_drift C 2 C % 1 offset voltage does not incorporate any error due to external magnetic fields. see section: impact of external magnetic fields. 2 percentage of i p , with i p = i pr (max) high accuracy, galvanically isolated current sensor ic with small footprint soic8 package acs722 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
11 characteristic performance zero current output vo ltage vs. t emperatur e offset v oltage vs. t emperature sensitivity vs. t emperature nonlinearity vs. t emperature t otal error at i vs. t emperature pr(max) sensitivity error vs. t emperature t emperature (oc) offset v oltage (mv) -50 -50 -50 -50 -50 -50 0 0 0 0 0 0 50 50 50 50 50 50 100 100 100 100 100 100 150 150 150 150 150 150 t emperature (oc) 1600 258 -4 1610 260 -3 1620 262 -2 1630 264 -1 1660 270 2 1640 266 0 1670 272 3 1650 268 1 1680 274 4 v (mv) iout(q) t emperature (oc) sensitivity (mv/a) t emperature (oc) sensitivity error (%) t emperature (oc) t otal error (%) t emperature (oc) nonlinearity (%) -1.00 -5 -0.80 -4 -0.40 -2 -0.20 -1 0.00 0 0.20 1 0.80 4 0.60 3 1.00 5 +3 sigma a verage -3 sigma -50 -40 -30 -20 10 -10 20 0 30 0.40 2 -0.60 -3 xllctr-5ab key parameters high accuracy, galvanically isolated current sensor ic with small footprint soic8 package acs722 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
12 zero current output vo ltage vs. t emperature offset v oltage vs. t emperature sensitivity vs. t emperature nonlinearity vs. t emperature t otal error at i vs. t emperature pr(max ) sensitivity error vs. t emperature t emperature (oc) offset v oltage (mv) -50 -50 -50 -50 -50 -50 0 0 0 0 0 0 50 50 50 50 50 50 100 100 100 100 100 100 150 150 150 150 150 150 t emperature (oc) 1635 -15 129 -4 130 -3 1640 -10 131 -2 1645 -5 132 -1 1655 5 135 2 133 0 136 3 1650 0 134 1 1660 10 137 4 v (mv) iout(q) t emperature (oc) sensitivity (mv/a) t emperature (oc) sensitivity error (%) t emperature (oc) t otal error (%) t emperature (oc) nonlinearity (%) -1.00 -5 -0.80 -4 -0.40 -2 -0.20 -1 0.00 0 0.20 1 0.80 4 0.60 3 1.00 5 +3 sigma a verage -3 sigma 0.40 2 -0.60 -3 xllctr-10ab key parameters high accuracy, galvanically isolated current sensor ic with small footprint soic8 package acs722 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
13 zero current output vo ltage vs. t emperature offset v oltage vs. t emperature sensitivity vs. t emperature nonlinearity vs. t emperature t otal error at i vs. t emperature pr(max) sensitivity error vs. t emperature t emperature (oc) offset v oltage (mv) -50 -50 -50 -50 -50 -50 0 0 0 0 0 0 50 50 50 50 50 50 100 100 100 100 100 100 150 150 150 150 150 150 t emperature (oc) 256 300 -30 -4 258 305 -25 -3 262 310 -20 -2 264 315 -15 -1 272 330 0 2 266 320 -10 0 274 335 5 3 268 325 -5 1 276 340 10 5 v (mv) iout(q) t emperature (oc) sensitivity (mv/a) t emperature (oc) sensitivity error (%) t emperature (oc) t otal error (%) t emperature (oc) nonlinearity (%) -1.00 -5 -0.80 -4 -0.40 -2 -0.20 -1 0.00 0 0.20 1 0.80 4 0.60 3 1.00 5 +3 sigma a verage -3 sigma 0.40 2 -0.60 -3 270 260 4 xllctr-10au key parameters high accuracy, galvanically isolated current sensor ic with small footprint soic8 package acs722 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
14 zero current output vo ltage vs. t emperatur e offset v oltage vs. t emperature sensitivity vs. t emperature nonlinearity vs. t emperature t otal error at i vs. t emperature pr(max) sensitivity error vs. t emperature t emperature (oc) offset v oltage (mv) -50 -50 -50 -50 -50 -50 0 0 0 0 0 0 50 50 50 50 50 50 100 100 100 100 100 100 150 150 150 150 150 150 t emperature (oc) 65 1634 1634 -4 65 1636 1636 -3 66 1638 1638 -2 67 1640 1640 -1 68 1648 1648 2 1644 1644 0 69 1650 1650 3 67 1646 1646 1 69 1652 1652 5 v (mv) iout(q) t emperature (oc) sensitivity (mv/a) t emperature (oc) sensitivity error (%) t emperature (oc) t otal error (%) t emperature (oc) nonlinearity (%) -1.00 -6 -0.80 -4 -0.40 -2 -0.20 0.00 0 0.20 0.80 4 0.60 1.00 6 +3 sigma a verage -3 sigma 0.40 2 -0.60 68 66 4 1642 1642 xllctr-20ab key parameters high accuracy, galvanically isolated current sensor ic with small footprint soic8 package acs722 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
15 zero current output vo ltage vs. t emperatur e offset v oltage vs. t emperature sensitivity vs. t emperature nonlinearity vs. t emperature t otal error at i vs. t emperature pr(max) sensitivity error vs. t emperature t emperature (oc) offset v oltage (mv) -50 -50 -50 -50 -50 -50 0 0 0 0 0 0 50 50 50 50 50 50 100 100 100 100 100 100 150 150 150 150 150 150 t emperature (oc) 129 310 -20 -4 130 315 -15 -3 132 -2 133 320 -10 -1 137 2 325 -5 0 138 335 5 3 135 330 0 1 139 340 10 5 v (mv) iout(q) t emperature (oc) sensitivity (mv/a) t emperature (oc) sensitivity error (%) t emperature (oc) t otal error (%) t emperature (oc) nonlinearity (%) -1.00 -5 -0.80 -4 -0.40 -2 -0.20 -1 0.00 0 0.20 1 0.80 4 0.60 3 1.00 5 +3 sigma a verage -3 sigma 0.40 2 -0.60 -3 136 131 4 134 xllctr-20au key parameters high accuracy, galvanically isolated current sensor ic with small footprint soic8 package acs722 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
16 zero current output vo ltage vs. t emperatur e offset v oltage vs. t emperature sensitivity vs. t emperature nonlinearity vs. t emperature t otal error at i vs. t emperature pr(max) sensitivity error vs. t emperature t emperature (oc) offset v oltage (mv) -50 -50 -50 -50 -50 -50 0 0 0 0 0 0 50 50 50 50 50 50 100 100 100 100 100 100 150 150 150 150 150 150 t emperature (oc) 32 1634 -16 -4 1636 -14 -3 33 1640 -10 -2 1642 -8 -1 35 1650 0 2 0 1652 2 3 1646 -4 1 35 1654 4 6 v (mv) iout(q) t emperature (oc) sensitivity (mv/a) t emperature (oc) sensitivity error (%) t emperature (oc) t otal error (%) t emperature (oc) nonlinearity (%) -1.00 -5 -0.80 -4 -0.40 -2 -0.20 -1 0.00 0 0.20 1 0.80 4 0.60 3 1.00 5 +3 sigma a verage -3 sigma 0.40 2 -0.60 -3 34 1648 -2 33 1638 -12 4 34 1644 -6 5 xllctr-40ab key parameters high accuracy, galvanically isolated current sensor ic with small footprint soic8 package acs722 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
17 zero current output vo ltage vs. t emperatur e offset v oltage vs. t emperature sensitivity vs. t emperature nonlinearity vs. t emperature t otal error at i vs. t emperature pr(max) sensitivity error vs. t emperature t emperature (oc) offset v oltage (mv) -50 -50 -50 -50 -50 -50 0 0 0 0 0 0 50 50 50 50 50 50 100 100 100 100 100 100 150 150 150 150 150 150 t emperature (oc) 65 310 -20 -4 315 -15 -3 66 320 -10 -2 325 -5 -1 69 2 0 340 10 3 330 0 1 69 345 15 v (mv) iout(q) t emperature (oc) sensitivity (mv/a) t emperature (oc) sensitivity error (%) t emperature (oc) t otal error (%) t emperature (oc) nonlinearity (%) -1.00 -5 -0.80 -4 -0.40 -2 -0.20 -1 0.00 0 0.20 1 0.80 4 0.60 3 1.00 5 +3 sigma a verage -3 sigma 0.40 2 -0.60 -3 68 335 5 65 4 67 5 68 67 66 xllctr-40au key parameters high accuracy, galvanically isolated current sensor ic with small footprint soic8 package acs722 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
18 sensitivity (sens) the change in sensor ic output in response to a 1 a change through the primary conductor. the sensitivity is the product of the magnetic circuit sensitivity (g / a) (1 g = 0.1 mt)and the linear ic amplifier gain (mv/g). the linear ic amplifier gain is programmed at the factory to optimize the sensitivity (mv/a) for the full-scale current of the device. nonlinearity (e lin ) the nonlinearity is a measure of how linear the output of the sen - sor ic is over the full current measurement range. the nonlinear - ity is calculated as: 1? [ { [ { v iout (i pr (max)) ? v iout(q) 100 (%) e lin = 2 v iout (i pr (max)/2) ? v iout(q) where v iout (i pr (max)) is the output of the sensor ic with the maximum measurement current flowing through it and v iout (i pr (max)/2) is the output of the sensor ic with half of the maximum measurement current flowing through it. zero current output voltage (v iout(q) ) the output of the sensor when the primary current is zero. for a unipolar supply voltage, it nominally remains at 0.5 v cc for a bidirectional device and 0.1 v cc for a unidirectional device. for example, in the case of a bidirectional output device, v cc = 3.3 v translates into v iout(q) = 1.65 v. variation in v iout(q) can be attributed to the resolution of the allegro linear ic quiescent voltage trim and thermal drift. offset voltage (v oe ) the deviation of the device output from its ideal quiescent value of 0.5 v cc (bidirectional) or 0.1 v cc (unidirectional) due to nonmagnetic causes. to convert this voltage to amperes, divide by the device sensitivity, sens. total output error (e tot ) the difference between the current measurement from the sensor ic and the actual current (i p ), relative to the actual current. this is equivalent to the difference between the ideal output voltage and the actual output voltage, divided by the ideal sensitivity, relative to the current flowing through the primary conduction path: e tot (i p ) v iout_ideal (i p ) ? v iout (i p ) sens ideal (i p ) i p 100 (%) = the total output error incorporates all sources of error and is a function of i p . at relatively high currents, e tot will be mostly definitions of accuracy characteristics figure 1: output voltage versus sensed current figure 2: total output error versus sensed current 0 a decreasing v iout (v) accuracy across temperature accuracy across temperature accuracy across temperature accuracy at 25c only accuracy at 25c only accuracy at 25c only increasing v iout (v) ideal v iout i pr (min) i pr (max) +i p (a) ?i p (a) v iout(q) full scale i p +i p ?i p +e t o t ?e t o t across t e m p e r a t u r e 25c only due to sensitivity error, and at relatively low currents, e tot will be mostly due to offset voltage (v oe ). in fact, at i p = 0, e tot approaches infinity due to the offset. this is illustrated in figures 1 and 2. figure 1 shows a distribution of output voltages versus i p at 25c and across temperature. figure 2 shows the correspond - ing e tot versus i p . high accuracy, galvanically isolated current sensor ic with small footprint soic8 package acs722 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
19 impact of external magnetic fields the acs722 works by sensing the magnetic field created by the current flowing through the package. however, the sensor cannot differentiate between fields created by the current flow and exter - nal magnetic fields. this means that external magnetic fields can cause errors in the output of the sensor. magnetic fields which are perpendicular to the surface of the package affect the output of the sensor, as it only senses fields in that one plane. the error in amperes can be quantified as: err or(b) = b c f where b is the strength of the external field perpendicular to the surface of the package in gauss, and c f is the coupling factor in g/a. then, multiplying by the sensitivity of the part, sens, gives the error in mv. for example, an external field of 1 gauss will result in around 0.1 a of error. if the acs722llctr-10ab, which has a nominal sensitivity of 132 mv/a, is being used, that equates to 13.2 mv of error on the output of the sensor. external field (gauss) error (a) error (mv) 5ab 10ab 20ab 40ab 0.5 0.05 13.2 6.6 3.3 1.65 1 0.1 26.4 13.2 6.6 3.3 2 0.2 52.8 26.4 13.2 6.6 application information high accuracy, galvanically isolated current sensor ic with small footprint soic8 package acs722 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
20 definitions of dynamic response characteristics power-on time (t po ) when the supply is ramped to its operating voltage, the device requires a finite time to power its internal components before responding to an input magnetic field. power-on time, t po , is defined as the time it takes for the output voltage to settle within 10% of its steady state value under an applied magnetic field, after the power supply has reached its minimum specified operating voltage, v cc (min), as shown in the chart at right. rise time (t r ) the time interval between a) when the sensor ic reaches 10% of its full scale value, and b) when it reaches 90% of its full scale value. the rise time to a step response is used to derive the band - width of the current sensor ic, in which ?(C3 db) = 0.35 / t r . both t r and t response are detrimentally affected by eddy current losses observed in the conductive ic ground plane. propagation delay (t pd ) the propagation delay is measured as the time interval a) when the primary current signal reaches 20% of its final value, and b) when the device reaches 20% of its output corresponding to the applied current. response time (t response ) the time interval between a) when the primary current signal reaches 90% of its final value, and b) when the device reaches 90% of its output corresponding to the applied current. v iout v t v cc v cc (min.) 90% v iout 0 t 1 = time at which power supply reaches minimum specified operating voltage t 2 = time at which output voltage settles within 10% of its steady state value under an applied magnetic field t 1 t 2 t po v cc (typ.) primary current v iout 90 0 (%) response time, t response t primary current v iout 90 10 20 0 (%) propagation delay, t pd rise time, t r t figure 3: power-on time (t po ) figure 4: rise time (t r ) and propagation delay ( t pd ) figure 5: response time (t response ) high accuracy, galvanically isolated current sensor ic with small footprint soic8 package acs722 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
21 figure 6: package lc, 8-pin soicn c 1.27 bsc a b b c 2 1 8 branding scale and appearance at supplier discretion c sea ting plane c 0.10 8x 0.25 bsc 1.04 ref 1.75 max 1.75 4.90 0.10 3.90 0.10 6.00 0.20 0.51 0.31 0.25 0.10 0.25 0.17 1.27 0.40 8 0 a standard branding reference v iew 2 1 1 8 c 0.65 1.27 5.60 branded face for reference only ? not for t ooling use (reference ms-012aa) dimensions in millimeters ? not to scale dimensions exclusive of mold ?ash, gate burrs, and dambar protrusions exact case and lead con?guration at supplier discretion within limits show n sea ting plane gauge plane pcb layout reference v iew nnnnnnn tpp-aaa lllll n = device part numbe r t= device temperature rang e p= package designator a=amperage l= lot number belly brand = country of origin te rminal #1 mark area reference land pattern layout (reference ipc7351 soic127p600x175-8m); all pads a minimum of 0.20 mm from all adjacent pads; adjust as necessary to meet application process requirements and pcb layout tolerances package outline drawing high accuracy, galvanically isolated current sensor ic with small footprint soic8 package acs722 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com
22 for the latest version of this document, visit our website: www.allegromicro.com copyright ?2011-2015, allegro microsystems, llc allegro microsystems, llc reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the performance, reliability, or manufacturability of its products. before placing an order, the user is cautioned to verify that the information being relied upon is current. allegros products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of allegros product can reasonably be expected to cause bodily harm. the information included herein is believed to be accurate and reliable. however, allegro microsystems, llc assumes no responsibility for its use; nor for any infringement of patents or other rights of third parties which may result from its use. revision history revision revision date description of revision C june 10, 2014 initial release. 1 october 29, 2014 added magnetic coupling factor characteristic and error due to external magnetic fields section 2 april 29, 2015 added characteristic performance graphs high accuracy, galvanically isolated current sensor ic with small footprint soic8 package acs722 allegro microsystems, llc 115 northeast cutoff worcester, massachusetts 01615-0036 u.s.a. 1.508.853.5000; www.allegromicro.com

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