1 m e m o r y all data sheets are subject to change without notice (858) 503-3300- fax: (858) 503-3301- www.maxwell.com 12-bit buffered multiplying 7545A ?2001 maxwell technologies all rights reserved. digital to analog converter 02.05.02 rev 4 ref v v dd dgnd agnd out1 db11-dbo input data latches dac 12 12 12-bit multipying r fb r wr cs f eatures : ?r ad -p ak ? patented shielding against natural space radia- tion total dose hardness: - > 100 krad (si), depending upon space mission excellent single event effects - sel th : > 120 mev/mg/cm 2 - seu th : > 120 mev/mg/cm 2 using all 1?s package: - 20 pin r ad -p ak ? flat pack - 20 pin r ad -p ak ? dip low gain temperature coefficient: - 5 ppm/ c typ. fast interface timing single +5 v to +15 v supply d escription : maxwell technologies? 7545A is a 12-bit cmos-buffered mul- tiplying dac with internal data latches, which features a greater than 100 krad (si) total dose tolerance, depending upon space mission. the 7545A features a wr pulse width of 100 ns which allows interfacing to a much wider range of fast 8-bit and 16-bit microprocessors. it is loaded by a single 12-bit wide word under the control of the cs and wr inputs; tying these control inputs low makes the input latches transparent allowing unbuffered operation of the dac. the 7545A is par- ticularly suitable for single supply operations and applications with wide temperature variations. maxwell technologies' patented r ad -p ak ? packaging technol- ogy incorporates radiation shielding in the microcircuit pack- age. it eliminates the need for box shielding while providing the required radiation shielding for a lifetime in orbit or space mission. in a geo orbit, r ad -p ak provides greater than 100 krad (si) radiation dose tolerance. this product is available with screening up to class s.
m e m o r y 2 all data sheets are subject to change without notice ?2001 maxwell technologies all rights reserved. 12-bit buffered multiplying digital to analog converter 7545A 02.05.02 rev 4 t able 1. 7545A p inout d escription p in s ymbol d escription 1 out 1 output current 2 agnd analog ground 3 dgnd digital ground 4 db 11 data bit 11 (msb) 5 db 10 data bit 10 6 db 9 data bit 9 7 db 8 data bit 8 8 db 7 data bit 7 9 db 6 data bit 6 10 db 5 data bit 5 11 db 4 data bit 4 12 db 3 data bit 3 13 db 2 data bit 2 14 db 1 data bit 1 15 db 0 data bit 0 (lsb) 16 cs chip select (active low) 17 wr write (active low) 18 v dd digital supply voltage 19 v ref reference input 20 rfb feedback resistance t able 2. 7545A a bsolute m aximum r atings p arameter s ymbol m in m ax u nit v dd to dgnd -- -0.3 17 v digital input voltage to dgnd -- -0.3 v dd + 0.3 v v rfb , v ref to dgnd -- -- 25 v v pin1 to dgnd -- -0.3 v dd + 0.3 v agnd to dgnd -- -0.3 v dd + 0.3 v power dissipation to 75 cp d -- 450 mw thermal impedance ? flat package jc -- 6.08 c/w thermal impedance ? dip package jc -- 6.04 c/w operating temperature -- -55 125 c storage temperature range t s -65 150 c
m e m o r y 3 all data sheets are subject to change without notice ?2001 maxwell technologies all rights reserved. 12-bit buffered multiplying digital to analog converter 7545A 02.05.02 rev 4 t able 3. d elta l imits p arameter v ariation i dd 10% t able 4. 7545A s pecifications (v dd = +5 v 10%, t a = -55 to 125 c unless otherwise noted ) t est s ymbol t est c ondition m in m ax u nit resolution res 12 -- bits relative accuracy ra -1/2 1/2 lsb differential nonlinearity dnl 12-bit monotonic t min to t max -1 1 lsb gain error 1 1. measured using feedback resistor. a e dac register loaded with 1111 1111 1111 -4 4 lsb gain temperature coefficient 2 2. guaranteed by design. tc ae -5 5 ppm/ c power supply rejection psrr v dd = 5% -0.004 0.004 %/% output current settling time 2 t sl to 1/2lsb; out1 load = 100 ? , dac output measured from fall- ing edge of wr . cs = 0v -- 2 s feed through error ft 5 (typical) mv p-p reference input resistance (pin 19 to ground) 2 r in 10 25 k ? digital input high voltage v ih 2.4 -- v digital input low voltage v il -- 0.8 v digital input leakage current i in v in = 0 v or v dd -10 10 a digital input capacitance 2 c in db0 - db11; wr , cs -- 20 pf output capacitance 2 c out1 db0 - db11 = 0 v, wr , cs = 0v -- 70 pf db0 - db11 = v dd , wr , cs = 0v -- 200 chip select to write setup time 3 3. not tested. t cs t cs > t wr , t ch > 0 380 -- ns chip select to write hold time 3 t ch 0-- write pulse width 3 t wr 400 -- data setup time 3 t ds 210 -- data hold time 3 t dh 10 -- supply current from v dd i dd all digital inputs v il or v ih -- 2 ma all digital inputs 0 or v dd -- 500 a
m e m o r y 4 all data sheets are subject to change without notice ?2001 maxwell technologies all rights reserved. 12-bit buffered multiplying digital to analog converter 7545A 02.05.02 rev 4 t able 5. 7545A s pecifications (v dd = +15 v 10%, t a = -55 to 125 c unless otherwise noted ) t est s ymbol t est c ondition m in m ax u nit relative accuracy ra -1/2 1/2 lsb differential nonlinearity dnl 12-bit monotonic t min to t max -1 1 lsb gain error 1 1. measured using feedback resistor. a e dac register loaded with 1111 1111 1111 -4 4 lsb gain temperature coefficient 2 2. guaranteed by design. tc ae -5 5 ppm/ c power supply rejection psrr v dd = 5% -0.004 0.004 %/% output current settling time 2 t sl to 1/2lsb; out1 load = 100 ? , dac output measured from fall- ing edge of wr . cs = 0v -- 2 s feed through error ft 5 (typical) mv p-p reference input resistance (pin 19 to ground) 2 r in 10 25 k ? digital input high voltage v ih 13.5 -- v digital input low voltage v il -- 1.5 v digital input leakage current i in v in = 0 v or v dd -10 10 a digital input capacitance 2 c in db0 - db11; wr , cs -- 15 pf output capacitance 2 c out1 db0 - db11 = 0 v, wr , cs = 0v -- 70 pf db0 - db11 = v dd , wr , cs = 0v -- 150 chip select to write setup time t cs t cs > t wr , t ch > 095--ns chip select to write hold time t ch 0-- write pulse width 3 t wr 95 -- data setup time 3 t ds 80 -- data hold time 3 t dh 5-- supply current from v dd i dd all digital inputs v il or v ih -- 2 ma all digital inputs 0 or v dd -- 100 a
m e m o r y 5 all data sheets are subject to change without notice ?2001 maxwell technologies all rights reserved. 12-bit buffered multiplying digital to analog converter 7545A 02.05.02 rev 4 f igure 1. w rite c ycle t iming d iagram f igure 2. m ode s election t able mode selection write mode: cs and wr low, dac responds to data bus (db0 - db11) inputs hold mode: either cs or wr high, data bus (db0 - db11) is locked out; dac holds last data present when wr or cs assumed high state.
m e m o r y 6 all data sheets are subject to change without notice ?2001 maxwell technologies all rights reserved. 12-bit buffered multiplying digital to analog converter 7545A 02.05.02 rev 4 d20-01 note: all dimensions in inches 20 p in r ad -p ak ? d ual i n l ine p ackage s ymbol d imension m in n om m ax a -- 0.202 0.230 b 0.014 0.018 0.026 b2 0.045 0.050 0.065 c 0.008 0.010 0.018 d -- 1.000 1.060 e 0.220 0.290 0.310 ea 0.300 bsc ea/2 0.150 bsc e 0.100 bsc l 0.125 0.145 0.155 q 0.015 0.045 0.070 s1 0.005 0.025 -- s2 0.005 -- -- n20
m e m o r y 7 all data sheets are subject to change without notice ?2001 maxwell technologies all rights reserved. 12-bit buffered multiplying digital to analog converter 7545A 02.05.02 rev 4 f20-01 note: all dimensions in inches 20 p in r ad -p ak ? f lat p ackage s ymbol d imension m in n om m ax a 0.128 0.141 0.154 b 0.015 0.017 0.022 c 0.003 0.005 0.009 d 0.470 0.480 0.490 e 0.287 0.295 0.303 e1 -- -- 0.333 e2 0.155 0.160 -- e3 0.030 0.068 -- e 0.050 bsc l 0.350 0.380 0.390 q 0.026 0.034 0.045 s1 0.005 0.007 -- n20
m e m o r y 8 all data sheets are subject to change without notice ?2001 maxwell technologies all rights reserved. 12-bit buffered multiplying digital to analog converter 7545A 02.05.02 rev 4 important notice: these data sheets are created using the chip manufacturers published specifications. maxwell technologies verifies functionality by testing key parameters either by 100% testing, sample testing or characterization. the specifications presented within these data sheets represent the latest and most accurate information available to date. however, these specifications are subject to change without notice and maxwell technologies assumes no responsibility for the use of this information. maxwell technologies? products are not authorized for use as critical components in life support devices or systems without express written approval from maxwell technologies. any claim against maxwell technologies must be made within 90 days from the date of shipment from maxwell tech- nologies. maxwell technologies? liability shall be limited to replacement of defective parts.
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