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lx1701 p roduction d ata s heet microsemi integrated products division 11861 western avenue, garden grove ca. 92841 714-898-8121, fax 714-893-2570 page 1 www. microsemi . com 2w filterless mono class-d audio amplifier copyright ? 2004 rev. 1.0b, 2005-04-29 tm ? description the lx1701 family represents a new generation of a fully integrated audio mono class-d amplifier from microsemi. this cmos monolithic class-d amplifier series is optimized for low voltage, low power operation and minimum system cost. the products are ideal for use in battery powered applications where low power consumption is desirable such as cell phones, pda?s, web tablets and other low power systems. the lx1701 family provides very low quiescent current consumption through the use of a proprietary output modulation scheme. this technology enables filter-less operation in many applications. the part features on board, low rdson, complementary output mosfet?s that reduces the need for external components. the lx1701 is offered in a small footprint, low profile surface mountable 16-pin mlpq package. important: for the most current data, consult microsemi ?s website: http://www.microsemi.com product highlight lx1701 gain inp inn vss pvss vdd pvdd outp outn + _ gain decoder clock pwm h-bridge & driver lpf lpf pvdd de-pop vdd audio input key features ? no output filter required ? low emi design ? low quiescent current: 2ma ? low shutdown current:1a ? low and wide supply voltage range: 1.8-6.0 volt ? 2w output power into 4 ? load with thd<1% 3w into 2 ? with thd<1% ? thd+n as low as 0.09% ? small form factor: 16-pin mlpq package: 4mmx4mm ? -40 to +85c operating range ? only 1 external component needed, no input ac coupling capacitor required, under certain conditions ? built-in clock frequency 200khz ? built-in feedback loop, allows high audio fidelity ? 14db/8db gain selectable ? 20/300hz bandwidth selectable ? shut-down function ? internal thermal shut-down ? high efficiency: 85% through modulation scheme and class-d operation ? built-in de-pop circuit, no turn on/off ?pop? noise applications/benefits ? pda's ? cell phones ? portable audio ? laptop computer speaker amplifier ? lcd tv/desktop monitor speaker amplifier ? pc audio multimedia amplifier package order info bare die lq plastic mlpq 16-pin t j ( c) rohs complaint / pb-free -40 to 85 lx1701 lx1701clq note: available in tape & reel. append the letters ?tr? to the part number. (i.e. lx1701clq-tr) l l x x 1 1 7 7 0 0 1 1
lx1701 p roduction d ata s heet microsemi integrated products division 11861 western avenue, garden grove ca . 92841 714-898-8121, fax 714-893-2570 page 2 www. microsemi . com 2w filterless mono class-d audio amplifier copyright ? 2004 rev. 1.0b, 2005-04-29 tm ? absolute maximum ratings positive supply voltage ( vdd, pvdd)............................................. -0 .3 to 7.0v operating temperature ..................................................................-40c to +85c maximum operating junc tion temperat ure ................................................ 150 c storage temperature......................................................................-65c to 150c lead temperature (soldering, 10 seconds................................................... 300 c package peak temp for solder reflow(40 s econd maximum exposure)...... 260c (+0, -5) note: exceeding these ratings could cause damage to the device. all voltages are with respect to ground. currents are positive into, negative out of specified terminal . thermal data lq plastic micro lead quad package 16-pin thermal resistance - junction to c ase , jc 3.22 c/w thermal resistance - junction to a mbient , ja 38.1 c/w junction temperature calculation: t j = t a + (p d x ja ). the ja numbers are guidelines for the thermal performan ce of the device/pc-board system. all of the above assume no ambient airflow. thermal te st board: jesd5-7 (leaded surface mount package) package pin out 1234 5 6 7 8 9 10 11 12 13 14 15 16 vdd 3lel vss pvss outn pvdd pvdd outp pvss vss en bw_sel gain vinn vinp tovl lq p ackage (top view) pb-free 100% matte tin finish functional pin description name description outn negative audi o (pwm) output pvdd positive supply to negative output stage pvdd positive supply to positive output stage outp positive audio (pwm) output pvss negative supply to positive output stage (ground) vss negative supply to analog stage (ground) en enable pin, active high. bw_sel bandwidth selection pin: vdd 300hz hp filter vss no hp (< 20hz) gain gain selection pin: tied to vdd gain = 14db tied to vss gain = 8db vinn negative audio input vinp positive audio input tovl thermal overload indicator output, active high. vdd analog positive power supply 3lvl three level modulation selection pin: tied to vss 2 level pwm modulat ion scheme, +pvdd | -pvdd; tied to vdd 3 level pwm modulati on scheme, +pvdd | pvss | -pvdd; vss negative power supply to analog stage pvss negative supply to negative output stage (ground) p p a a c c k k a a g g e e d d a a t t a a
lx1701 p roduction d ata s heet microsemi integrated products division 11861 western avenue, garden grove ca . 92841 714-898-8121, fax 714-893-2570 page 3 www. microsemi . com 2w filterless mono class-d audio amplifier copyright ? 2004 rev. 1.0b, 2005-04-29 tm ? system characteristics unless otherwise specified, the following specifications apply over the operating ambient temperature t a = 25 c except where otherwise noted and the following test conditions: default settings: 20hz corner low frequency, 14db gain. lx1701 parameter symbol test conditions min typ max units no load, vdd = pvdd = 1.8v 0.9 1.2 no load, vdd = pvdd = 3.3v 1.3 1.8 supply current, quiescent iqq no load, vdd = pvdd = 5.0v 2.0 2.5 ma supply current, shutdown mode iqqsd disable pin active 1 a thd+n = 1% 1.3 vdd = pvdd = 5v, fin = 1khz thd+n = 10% 1.8 thd+n = 1% 0.5 output power @ 8 ohms po vdd = pvdd = 3.3v, fin = 1khz thd+n = 10% 0.7 w thd+n = 1% 2.1 vdd = pvdd = 5v, fin = 1khz thd+n = 10% 2.8 thd+n = 1% 0.9 output power @ 4 ohms po vdd = pvdd = 3.3v, fin = 1khz thd+n = 10% 1.2 w thd+n = 1% 3.0 vdd = pvdd = 5v, fin = 1khz thd+n = 10% 3.9 thd+n = 1% 1.3 output power @ 2 ohms po vdd = pvdd = 3.3v, fin = 1khz thd+n = 10% 1.8 w power efficiency vdd = pvdd = 5v, fin = 1khz, rl = 8 ? 85 % total harmonic distortion @ 50% of max power thd+n vdd = pvdd = 5v, fin = 1khz, rl = 8 ? 0.09 % signal-to-noise ratio snr vdd = pvdd = 5v, f = 1khz, po = 1w, a-weighted 99 db output noise floor vn input grounded a-weighted 20-20khz 25 v rms flo 3db relative to 1khz, bw select = vss 20 hz frequency response lower corner frequency fhi 3db relative to 1khz, bw select = vdd 300 hz frequency response vdd = pvdd = 1.8 to 5.5v, rl = 4 ? , po = 200mw @ 20~80khz, filterless 3 db power supply rejection ratio psrr vdd = pvdd = 1.8v to 5.5v 65 db common mode rejection ratio cmrr vdd = pvdd = 1.8v to 5.5v 70 db pin 9 tied to vdd, vdd = pvdd = 1.8v to 5.5v 14 gain gsys pin 9 tied to vss, vdd = pvdd = 1.8v to 5.5v 8 db e e l l e e c c t t r r i i c c a a l l s s
lx1701 p roduction d ata s heet microsemi integrated products division 11861 western avenue, garden grove ca . 92841 714-898-8121, fax 714-893-2570 page 4 www. microsemi . com 2w filterless mono class-d audio amplifier copyright ? 2004 rev. 1.0b, 2005-04-29 tm ? electrical characteristics unless otherwise specified, the following specificati ons apply over the operating ambient temperature -40 c t a 85 c except where otherwise noted. lx1701 parameter symbol test conditions min typ max units supply voltage vdd pvdd 1.8 6.0 v oscillator frequency fsw vdd = pvdd = 1.8~5.5v 180 200 225 khz vdd = pvdd = 5v 2.0 2.5 vdd = pvdd = 3.3v 1.3 1.8 supply current, quiescent iqq no load vdd = pvdd = 1.8v 0.9 1.2 ma supply current, shutdown mode iqqsd disable pin active 1 a power supply rejection ratio psrr vdd = pvdd = 1.8v to 5.5v 65 db common mode rejection ratio cmrr vdd = pvdd = 1.8v to 5.5v 70 db input impedance input voltage range vin vdd = pvdd = 1.8~5.5v -0.3 vdd +0.3 v k in gain = 14db, bw = 20hz 65 gain = 14db, bw = 300hz 72 k ? gain = 8db, bw = 20hz 98 input resistance differential gain = 8db, db = 300hz 102 output dc offset voff input shorted to gnd, 20hz corner, 14db gain vdd = pvdd = 3.3v 2 8 mv v inoff gain = 14db bw = 20hz, pvdd = 5v 0.14 gain = 14db, bw = 300hz, pvdd = 5v 1.50 gain = 8db, bw = 20hz, pvdd = 5v 0.25 input dc offset dynamic range max. with output voff < 200mv gain = 8db, bw = 300hz, pvdd = 5v 2.70 v p channel 360 vdd = pvdd=5v n channel 350 p channel 490 vdd = pvdd=3.3v n channel 460 p channel 600 ? static drain-to-source on- resistance rdson vdd = pvdd=1.8v n channel 600 ? m ? gh pin 9 tied to vdd, vdd = pvdd = 1.8v to 5.5v 14 stage gain gl pin 9 tied to vss, vdd = pvdd = 1.8v to 5.5v 8 db thermal indicator junction t j 150 c thermal indicator output vtovl vdd = pvdd = 1.8~5.5v vdd vdd +0.3 v under voltage threshold level vuv 1.55 1.65 1.75 v enable threshold vdd = pvdd =3.3v 1.3 1.5 1.7 v ? at +85 c ambient temperature. e e l l e e c c t t r r i i c c a a l l s s
lx1701 p roduction d ata s heet microsemi integrated products division 11861 western avenue, garden grove ca . 92841 714-898-8121, fax 714-893-2570 page 5 www. microsemi . com 2w filterless mono class-d audio amplifier copyright ? 2004 rev. 1.0b, 2005-04-29 tm ? simplified block diagram gain vinp vinn pvss outp outn gain decoder triangle wave generator dynamic pulse generator lpf lpf de-pop ground signal ground generation vdd vss pvss pvdd pvdd en driver driver figure 1 ? lx1701 simplified block diagram b b l l o o c c k k d d i i a a g g r r a a m m
lx1701 p roduction d ata s heet microsemi integrated products division 11861 western avenue, garden grove ca . 92841 714-898-8121, fax 714-893-2570 page 6 www. microsemi . com 2w filterless mono class-d audio amplifier copyright ? 2004 rev. 1.0b, 2005-04-29 tm ? typical application schematic outn pvdd pvdd outp gain vinn vinp tovl pvss vss en bw_sel vdd 3lel vss pvss lx1701 vbat jp1 c2 c3 audio in thermal indicator vbat vbat vbat vbat gnd c1 vbat + jp3 jp4 1 2 1 2 1 2 j1 j2 j3 9 10 11 12 13 14 15 16 1 2 3 4 5 6 7 8 figure 2 ? lx1701 typical application circuit a a p p p p l l i i c c a a t t i i o o n n s s
lx1701 p roduction d ata s heet microsemi integrated products division 11861 western avenue, garden grove ca . 92841 714-898-8121, fax 714-893-2570 page 7 www. microsemi . com 2w filterless mono class-d audio amplifier copyright ? 2004 rev. 1.0b, 2005-04-29 tm ? functional description g eneral d escription the lx1701 is a filterless, low-emi, class-d audio power amplifier. it offers high performance (thd+n is just 0.1% at 2w), high effici ency (>85% at 1.2w), and best in class emi radiation (just 20dbuv/m). the internal signal path is completely differential to minimize common- mode noise pickup. the inputs may be driven single-ended or differentially and they may be direct or ac coupled. the lx1701 may be operated w ith just a single decoupling capacitor. f ilterless 3-l evel c lass -d m odulation the lx1701 output stage is co nfigured as a full h-bridge push-pull driver. the speaker must be driven differentially from the outp and outn pins. each side of the speaker is driven by a 200khz switching signal that transitions between vdd and gnd. with zero input voltage, the duty cycle at each output is around 50% and the signals are in- phase with each other. in this case, there is basically no differential voltage across the speaker. when the input signal goes positive, the duty cycle at outp increases above 50% and the duty cycle at outn decreases below 50%. this causes a net positive current to flow into the speaker. a negative input voltage causes the outn duty cycle to increase and the outp duty cycle to decrease which causes a net negative current to flow into the speaker. the differential voltage across the speaker has a fundamental frequency of twice the 200khz switching frequency. the speaker itself serves as the low pass filter which then recreates the audi o signal. this type of modulation can be described as driving +vdd, -vdd, and 0v across the speaker which is why it is referred to as 3- level modulation. classical, 2-level modulation drives either +vdd or ?vdd across the speaker at all times. this scheme requires an l- c filter between the amplifier?s outputs and the speaker in order to keep the output current low. l ow -emi o utput s tage with s lew r ate l imiting and a ctive o vershoot c lamping with 3-level modulation, the carrier frequency drives a full amplitude common-mode signal to the speaker wires. this can cause high emi radiation. one way to combat this would be to filter the outputs with l-c filters or ferrite beads located close to the ampl ifier. in the lx1701, the output stage has been carefull y designed to minimize emi radiation so that these types of filters are not required. slew rate limiting is used to keep the outputs from switching too quickly. active overshoot clamping is used to minimize the inductive over shoot which occurs at each transition. these two techniques allow the lx1701 to easily meet fcc standards fo r radiated emissions when driving up to 3 meters of speaker wire. a ctive dc i nput o ffset c ancellation an internal dc servo loop senses the output differential voltage and feeds it back to the error amplifier through a low pass filter. the corner frequency of this filter can be set at 20hz or 300hz via a control pin. this allows the lx1701 to reject signals below these frequencies. since this is an active control loop, it does not have the same dynamic range as a purely passive solution (such as an input ac-coupling capacitor). the dynamic range of the offset cancellation loop is a fu nction of the selected gain and high pass corner frequency. in applications where the input offset may be higher th an the dc offset cancellation range, ac-coupling capacitors should be used. d ifferential s ignal p ath , w ide d ynamic r ange , and b uilt - in t hermal o verload p rotection the fully differential signal path uses delta-sigma techniques and multiple feedback loops to provide high performance and low distortion. this is all fully-integrated to eliminate the need for any external feedback components or filters. the gain can be selected to be either 8 or 14db by a control pin. the differential signal path and internal voltage boosters allow for wide dynamic range. in fact, the lx1701 can be operated from supplies as low as 1.8v and as high as 6v. the output power will be limited by the available supply voltage. an internal thermal sensing circuit shuts down the outputs and forces the tovl output pin high when the junction temperature exceeds about 150degc to provide thermal overload protection. d d e e s s c c r r i i p p t t i i o o n n
lx1701 p roduction d ata s heet microsemi integrated products division 11861 western avenue, garden grove ca . 92841 714-898-8121, fax 714-893-2570 page 8 www. microsemi . com 2w filterless mono class-d audio amplifier copyright ? 2004 rev. 1.0b, 2005-04-29 tm ? evaluation module test set-up power supply audio precision system one lx1701 c1 c2 c3 on-board resistor load 2 nd order rc lpf 2 nd order rc lpf audio precision system one output - output + in - in + input + gnd input - vbat gnd + - tp+ out+ out - tp - lx1701 eval kit figure 3 ? typical test setup circuit default settings: equipments: audio precision system 1, oscilloscope, power supply ~+5v; supply voltage: 1.8v/3.3v/5.0v 3 corner voltages on-board passive lpf: 40khz cut off frequency (-3db) on-board resistor load: 2/4/8 ? , 5w ap settings: 10hz ~ 22khz bpf e e v v a a l l u u a a t t i i o o n n
lx1701 p roduction d ata s heet microsemi integrated products division 11861 western avenue, garden grove ca . 92841 714-898-8121, fax 714-893-2570 page 9 www. microsemi . com 2w filterless mono class-d audio amplifier copyright ? 2004 rev. 1.0b, 2005-04-29 tm ? application information for test purpose outn pvdd pvdd outp gain vinn vinp tovl pvss vss en bw_sel vdd 3lel vss pvss lx1701 vbat jp1 c8 c9 audio in thermal indicator vbat vbat vbat vbat gnd c1 vbat + jp3 jp2 1 2 1 2 1 2 j1 j2 j3 9 10 11 12 13 14 15 16 1 2 3 4 5 6 7 8 r1 4/2w c7 470nf c6 470nf jp4 jp5 r4 470 r5 470 c4 4700pf c5 2200pf tp2 r2 470 r3 470 c2 4700pf c3 2200pf tp1 j4 option for test purpose *c1 value is dependant on the current drain from powe r supply, 1.0 ~ 33f with output power 350mw ~ 3.5w figure 4 ? lxe1701 evaluation module schematic a a p p p p l l i i c c a a t t i i o o n n s s
lx1701 p roduction d ata s heet microsemi integrated products division 11861 western avenue, garden grove ca . 92841 714-898-8121, fax 714-893-2570 page 10 www. microsemi . com 2w filterless mono class-d audio amplifier copyright ? 2004 rev. 1.0b, 2005-04-29 tm ? thd+n vs. power 0.001 100 0.01 0.1 1 10 % 10m 2 20m 50m 100m 200m 500m 1 w 8 ohm,f=1khz, 10~22khz bpf 14db, bw - 20hz vdd=5.0v vdd=3.3v vdd=1.8v thd+n vs. power 0.001 100 0.01 0.1 1 10 50 % 10m 2 20m 50m 100m 200m 500m 1 w 8 ohm,f=1khz, 10~22khz bpf 14db, bw - 300hz vdd=5.0v vdd=3.3v vdd=1.8v thd+n vs. power 0.001 100 0.01 0.1 1 10 50 % 10m 2 20m 50m 100m 200m 500m 1 8ohm,f=1khz, 10~22khz bpf 8db, bw - 20hz vdd=5.0v vdd=3.3v vdd=1.8v thd+n vs. power 0.001 100 0.01 0.1 1 10 50 % 10m 2 20m 50m 100m 200m 500m 1 w t 8 ohm,f=1khz, 10~22khz bpf 8db, bw - 300hz vdd=3.3v vdd=5.0v vdd=1.8v thd+n vs. power 0.001 100 0.01 0.1 1 10 50 % 10m 3 20m 50m 100m 200m 500m 1 2 w 4 ohm,f=1khz, 10~22khz bpf 14db, bw - 20hz vdd=5.0v vdd=3.3v vdd=1.8v thd+n vs. power 0.001 100 0.01 0.1 1 10 50 % 10m 3 20m 50m 100m 200m 500m 1 2 w 4 ohm,f=1khz, 10~22khz bpf 14db, bw - 300hz vdd=5.0v vdd=3.3v vdd=1.8v c c h h a a r r t t s s
lx1701 p roduction d ata s heet microsemi integrated products division 11861 western avenue, garden grove ca . 92841 714-898-8121, fax 714-893-2570 page 11 www. microsemi . com 2w filterless mono class-d audio amplifier copyright ? 2004 rev. 1.0b, 2005-04-29 tm ? thd+n vs. power 0.001 100 0.01 0.1 1 10 50 % 10m 3 20m 50m 100m 200m 500m 1 2 w 4 ohm,f=1khz, 10~22khz bpf 8db, bw - 20hz vdd=5.0v vdd=3.3v vdd=1.8v thd+n vs. power 0.001 100 0.01 0.1 1 10 50 % 10m 3 20m 50m 100m 200m 500m 1 2 w 4 ohm,f=1khz, 10~22khz bpf 8db, bw - 300hz vdd=3.3v vdd=5.0v vdd=1.8v thd+n vs. power 0.001 100 0.01 0.1 1 10 50 10m 4 20m 50m 100m 200m 500m 1 2 w 2 ohm,f=1khz, 10~22khz bpf 14db, bw - 20hz vdd=5.0v vdd=3.3v vdd=1.8v % thd+n vs. power 0.001 100 0.01 0.1 1 10 50 % 10m 4 20m 50m 100m 200m 500m 1 2 w 2 ohm,f=1khz, 10~22khz bpf 14db, bw - 300hz vdd=5.0v vdd=3.3v vdd=1.8v thd+n vs. power 0.001 100 0.01 0.1 1 10 50 % 10m 4 20m 50m 100m 200m 500m 1 2 w 2ohm,f=1khz, 10~22khz bpf 8db, bw - 20hz vdd=5.0v vdd=3.3v vdd=1.8v thd+n vs. power 0.001 100 0.01 0.1 1 10 50 % 10m 4 20m 50m 100m 200m 500m 1 2 w t t 2 ohm,f=1khz, 10~22khz bpf 8db, bw - 300hz vdd=3.3v vdd=5.0v vdd=1.8v c c h h a a r r t t s s
lx1701 p roduction d ata s heet microsemi integrated products division 11861 western avenue, garden grove ca . 92841 714-898-8121, fax 714-893-2570 page 12 www. microsemi . com 2w filterless mono class-d audio amplifier copyright ? 2004 rev. 1.0b, 2005-04-29 tm ? lx1701 2w mono class-d audio amplifier thd+n vs. frequency 0.001 100 0.01 0.1 1 10 % 100 20k 200 500 1k 2k 5k 10k hz 4ohm,po=50%pmax, 10~22khz bpf vdd=1.8v vdd=5.0v vdd=3.3v lx1701 2w mono class-d audio amplifier thd+n vs. frequency 0.001 10 0 0.01 0. 1 1 10 % 10 0 20k 200 500 1k 2k 5k 10k hz vdd=3.3v vdd=5.0v vdd=1.8v 4ohm,po=100mw, 10~22khz bpf lx1701 2w mono class-d audio amplifier thd+n vs. frequency 0.001 100 0.01 0.1 1 10 % 100 20k 200 500 1k 2k 5k 10k hz vdd=5.0v vdd=1.8v vdd=3.3v 8ohm,po=100mw, 10~22khz bpf -5 +5 -3 -1 +1 +3 20 80k 100 500 1k 5k 10k 50k hz dbr lx1701 2w mono class-d audio amplifier frequency response 8ohm,po=100mw, 20hz corner frequency vdd=1.8v/3.3v/5.0v -5 +5 -3 -1 +1 +3 20 80k 50 100 500 1k 5k 10k 50k hz 8ohm,po=100mw, 300hz corner frequency vdd=1.8v/3.3v/5.0v lx1701 2w mono class-d audio amplifier frequency response dbr -5 +5 -3 -1 +1 +3 20 80k 50 100 500 1k 5k 10k 50k hz 4ohm,po=100mw, 20hz corner frequency vdd=1.8v/3.3v/5.0v lx1701 2w mono class-d audio amplifier frequency response dbr c c h h a a r r t t s s
lx1701 p roduction d ata s heet microsemi integrated products division 11861 western avenue, garden grove ca . 92841 714-898-8121, fax 714-893-2570 page 13 www. microsemi . com 2w filterless mono class-d audio amplifier copyright ? 2004 rev. 1.0b, 2005-04-29 tm ? -5 +5 -3 -1 +1 +3 20 80k 50 100 500 1k 5k 10k 50k hz 4ohm,po=100mw, 300hz corner frequency vdd=1.8v/3.3v/5.0v lx1701 2w mono class-d audio amplifier frequency response dbr 0 +12 +2 +4 +6 +8 +10 20 20k 50 100 200 500 1k 2k 5k 10k hz dbr lx1701 2w mono class-d audio amplifier system gain 4ohm,po=100mw, 8db gain setting vdd=1.8v/3.3v/5.0v 20hz corner freq. vdd=1.8v/3.3v/5.0v 300hz corner freq. 0 +12 +2 +4 +6 +8 +10 20 20k 50 100 500 1k 5k 10k hz dbr lx1701 2w mono class-d audio amplifier system gain 8ohm,po=100mw, 8db gain setting vdd=1.8v/3.3v/5.0v 20hz corner freq. vdd=1.8v/3.3v/5.0v 300hz corner freq. 0 +12 +2 +4 +6 +8 +10 20 20k 50 100 500 1k 5k 10k hz dbr lx1701 2w mono class-d audio amplifier system gain 8ohm,po=100mw, 8db gain setting vdd=1.8v/3.3v/5.0v 20hz corner freq. vdd=1.8v/3.3v/5.0v 300hz corner freq. 0 +20 +2 +4 +6 +8 +10 +12 +14 +16 +18 20 20k 50 100 200 500 1k 2k 5k 10k hz dbr lx1701 2w mono class-d audio amplifier system gain 4ohm,po=100mw, 14db gain setting vdd=1.8v/3.3v/5.0v 20hz corner freq. vdd=1.8v/3.3v/5.0v 300hz corner freq. 0 +20 +2 +4 +6 +8 +10 +12 +14 +16 +18 20 20k 50 100 500 1k 5k 10k hz dbr lx1701 2w mono class-d audio amplifier system gain 8ohm,po=100mw, 14db gain setting vdd=1.8v/3.3v/5.0v 20hz corner freq. vdd=1.8v/3.3v/5.0v 300hz corner freq. c c h h a a r r t t s s
lx1701 p roduction d ata s heet microsemi integrated products division 11861 western avenue, garden grove ca . 92841 714-898-8121, fax 714-893-2570 page 14 www. microsemi . com 2w filterless mono class-d audio amplifier copyright ? 2004 rev. 1.0b, 2005-04-29 tm ? lx1701 2w mono class-d audio amplifier signal-to-noise ratio -180 +0 -160 -140 -120 -100 -80 -60 -40 -20 20 20k 50 100 200 500 1k 2k 5k 10k hz dbr 4ohm,10~22khz bpf 1.8v / 3.3v / 5.0v lx1701 2w mono class-d audio amplifier signal-to-noise ratio -140 +0 -120 -100 -80 -60 -40 -20 20 20k 50 100 200 500 1k 2k 5k 10k hz dbr 8ohm,10~22khz bpf 1.8v / 3.3v / 5.0v lxe1701 3 feet speaker wire. test distance: 3 meters; horizential date: 1/16/2004 time: 1:08:40pm ckc laboratories 40 50 30 20 10 0 -10 30 100 1000 frequency (mhz) db v/m 1 - cispr 22 b radiated lxe1701 3 feet speaker wire. test distance: 3 meters; vertical date: 1/16/2004 time: 1:22:07pm ckc laboratories 50 40 30 20 10 -10 30 100 1000 frequency (mhz) db v/m 1 - cispr 22 b radiated c c h h a a r r t t s s
lx1701 p roduction d ata s heet microsemi integrated products division 11861 western avenue, garden grove ca . 92841 714-898-8121, fax 714-893-2570 page 15 www. microsemi . com 2w filterless mono class-d audio amplifier copyright ? 2004 rev. 1.0b, 2005-04-29 tm ? -100 -40 -95 -90 -85 -80 -75 -70 -65 -60 -55 -50 -45 - 63.25 5 dbr 10 80k 20 50 100 200 500 1k 2k 5k 10k 20k hz lx1701 power supply rejection ratio pvdd=vdd=4.0v +/-1v, 8ohm load pow er efficiency (8 ohm) 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% 0 200 400 600 800 1000 1200 1400 p out (mw) efficiency (%) 3.0v 4.5v 5.5v iqq vs. supply voltage 0.6 0.8 1.0 1.2 1.4 1.6 1.8 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 voltage (v) iqq (ma) 8ohm spk c c h h a a r r t t s s
lx1701 p roduction d ata s heet microsemi integrated products division 11861 western avenue, garden grove ca . 92841 714-898-8121, fax 714-893-2570 page 16 www. microsemi . com 2w filterless mono class-d audio amplifier copyright ? 2004 rev. 1.0b, 2005-04-29 tm ? pcb design guidelines pcb d esign g uidelines one of the key efforts in implementing the mlp package on a pc board is the design of the land pattern. the mlp has rectangular metallized terminals exposed on the bottom surface of the pack age body. electrical and mechanical connection between the component and the pc board is made by screen printing solder paste on the pc board and reflowing the paste after plac ement. to guarantee reliable solder joints it is essential to design the land pattern to the mlp terminal pattern, exposed pad and thermal pad via. there are two basic designs for pcb land pads for the mlp: copper defined style (also known as non solder mask defined (nsmd)) and the solder mask defined style (smd). the industry has had some debate of the merits of both styles of land pads, and although we recommend the copper defined style land pad (nsmd), both styles are acceptable for use with the ml p package. nsmd pads are recommended over smd pads due to the tighter tolerance on copper etching than solder masking. nsdm by definition also provides a larg er copper pad area and allows the solder to anchor to the edges of the copper pads thus providing improved solder joint reliability. d esign of pcb l and p attern for p ackage t erminals as a general rule, the pcb lead finger pad (y) should be designed 0.2-0.5mm longer than the package terminal length for good filleting. the pad length should extended 0.05mm towards the centerline of the package. the pad width (x) should be a minimum 0.05mm wider than the package terminal width (0.025mm per side), refer to figure 5. however, the pad width is reduced to the width of the component terminal for lead pitches below 0.65mm. this is done to minimize the risk of solder bridging. 0.05mm y2 0.20mm y1 pcb pcb pad solder part lead part figure 5 ? pc board land pattern geometry for mlp terminals e xposed p ad pcb d esign the construction of the exposed pad mlp enables enhanced thermal and electrical characteristics. in order to take full advantage of this feature the exposed pad must be physically connected to the pcb substrate with solder. the thermal pad (d2th) should be greater than d2 of the mlp whenever possible, howe ver adequate clearance (cpl > 0.15mm) must be met to prevent solder bridging. if this clearance cannot be met, then d2th should be reduced in area. the formula would be: d2th >d2 only if d2th < gmin - (2 x cpl). d2th 2.5mm max gmin 2.9mm zmin 4.55mm figure 6 ? land pattern for lq16 (4x4mm) zmin= d + aaa + 2(0.2) (where pkg body tolerance aaa=0.15) (where 0.2 is outer pad extension) gmin= d-2(lmax)-2(0.05) (where 0.05 is inner pad extension) (lmax=0.50 for this example) d2th max = gmin-2(cpl) (where cpl=0.2) a a p p p p l l i i c c a a t t i i o o n n s s (x1) min: 0.025mm per side for lead pitches > 0.65mm
lx1701 p roduction d ata s heet microsemi integrated products division 11861 western avenue, garden grove ca . 92841 714-898-8121, fax 714-893-2570 page 17 www. microsemi . com 2w filterless mono class-d audio amplifier copyright ? 2004 rev. 1.0b, 2005-04-29 tm ? pcb design guidelines (continued) t hermal p ad v ia d esign there are two types of on-board thermal pad design, one is using thermal vias to sink the heat to the other layer with metal traces. based on jedec specification jesd 51-5, the thermal vias should be designed like figure 7. another one is the no via thermal pad which is using the same side copper pad as heatsink, this type of thermal pad is good for two layer board, since the bottom side is filled with all other kinds of trace also, it?s ha rd to use the whole plane for the heatsink. but you still can use vias to sink the heat to the bottom layer by the metal traces, then layout a nmsd on which a metal heatsink is put to sink the heat to the air. micro lead quad package land pattern land pattern for four layer board with vias figure 7 ? comparison of land pattern theory for lx1701 with mlpq-4x4 16lds p ackage, which has ja =38.1 c/w by package itself, with maximum 2w (@4ohm) output it only has 300mw power dispassion (assuming 85% efficiency), which only has 11.4 c temperature rise. so the non-via type thermal pad is suggested. 0.3mm dia. 0.15mm minimum gap 2.50mm maximum 0.28mm 0.37mm nominal 0.05mm minimum 0.5mm 0.15mm minimum package pad pcb land thermal via pin 1 indicator (bottom of package) 1 - 1.2mm top view figure 8 ? recommended land pad with vias for lq16 a a p p p p l l i i c c a a t t i i o o n n s s
lx1701 p roduction d ata s heet microsemi integrated products division 11861 western avenue, garden grove ca . 92841 714-898-8121, fax 714-893-2570 page 18 www. microsemi . com 2w filterless mono class-d audio amplifier copyright ? 2004 rev. 1.0b, 2005-04-29 tm ? application information figure 9 ? lxe1701 evaluation module pcb layout figure 10 ? lx1701 real pcb area with decoupling capacitor a a p p p p l l i i c c a a t t i i o o n n s s 6mm 4mm
lx1701 p roduction d ata s heet microsemi integrated products division 11861 western avenue, garden grove ca . 92841 714-898-8121, fax 714-893-2570 page 19 www. microsemi . com 2w filterless mono class-d audio amplifier copyright ? 2004 rev. 1.0b, 2005-04-29 tm ? package dimensions lq 16-pin mlpq plastic (4x4mm ep / 114x114cu exposed pad) e d e b e2 d2 a a3 a1 l k m illimeters i nches dim min max min max a 0.80 1.00 0.031 0.039 a1 0 0.05 0 0.002 a3 0.2 ref 0.008 ref b 0.23 0.38 0.009 0.015 d 4.00 bsc 0.157 bsc e 4.00 bsc 0.157 bsc e 0.65 bsc 0.026 bsc d2 2.55 2.80 0.100 0.110 e2 2.55 2.80 0.100 0.110 k 0.20 - 0.008 - l 0.30 0.50 0.012 0.020 note: 1. dimensions do not include mold flash or protrusions; these shall not exceed 0.155mm(.006?) on any side. lead dimension shall not include solder coverage. m m e e c c h h a a n n i i c c a a l l s s
lx1701 p roduction d ata s heet microsemi integrated products division 11861 western avenue, garden grove ca . 92841 714-898-8121, fax 714-893-2570 page 20 www. microsemi . com 2w filterless mono class-d audio amplifier copyright ? 2004 rev. 1.0b, 2005-04-29 tm ? notes production data ? information contained in this document is proprietary to microsemi and is current as of publication date. this document may not be modified in any way without the express written consent of microsemi. product processing does not nece ssarily include testing of all parameters. microsemi reserves the right to change the configuration and performance of the product and to discontinue product at any time. n n o o t t e e s s

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