View LX1704ILQ-TR_4574440.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

lx1704 p roduction d ata s heet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, 800-877-6458, fax: 714-893-2570 page 1 www. microsemi . com 2w filter less stereo class-d amplifier tm ? copyright ? 2009 rev.1.4, 2009-02-23 description the lx1704 family represents a new generation of a fully integrated audio stereo class-d amplifier from microsemi. this cmos stereo 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: portable speakers, dvds, pmp, and other low power systems. the lx1704 family provides very low quiescent current consumption through the use of a proprietary output modulation scheme. this technology enables filterless operation in many applications. the part features on board, low rdson, complementary output mosfet?s that reduces the need for external components. the lx1704 is offered in a small footprint, low profile, 4mm x 4mm 16- pin mlpq. important: for the most current data, consult microsemi ?s website: http://www.microsemi.com product highlight part pvss1 vdd in1+ in1- out1+ pvdd1 out1- pvss3 out2- pvdd2 out2+ pvss2 in2- in2+ vss en lx1704 vdd in1+ in1- in2- in2+ enable speaker out 2 pvdd speaker out 1 pvdd key features ? no output filter required ? low emi design ? low quiescent current: 4ma ? low shutdown current: 1a ? wide supply voltage range: 2.5 - 5.5 volt ? 2w output power into 4 ? load with thd<1% @ 5.0v ? thd+n as low as 0.1% ? small form factor...16 pin mlp package only 4 x 4mm ? built-in clock frequency ? built-in feedback loop, keep high audio fidelity ? fixed 20db gain ? full 20 - 20khz audio bandwidth ? shut-down function ? internal thermal shutdown ? high efficiency: over 85% through modulation scheme and class-d operation ? built-in de-pop circuit applications ? portable speakers ? portable dvd ? pmp / pmc ? notebook pc package order info lq plastic mlpq 4mm x 4mm 16-pin t a ( c) rohs compliant / pb-free -40 to 85 lx1704ilq note: available in tape & reel. append the letters ?tr? to the part number. (i.e. LX1704ILQ-TR) l l x x 1 1 7 7 0 0 4 4
lx1704 p roduction d ata s heet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, 800-877-6458, fax: 714-893-2570 page 2 www. microsemi . com 2w filter less stereo class-d amplifier tm ? copyright ? 2009 rev.1.4, 2009-02-23 absolute maximum ratings positive supply voltage (vdd, pvdd) ........................................................... -0.3 to 6.5v analog input voltage (in1+, in1-, in 2+, in2 -).................................. -0.3 to vdd + 0.3v digital input voltage(en, mute) ...................................................... -0.3 to vdd + 0.3v operating temperature range (t a ) ............................................................ -40c to +85c maximum operating junction temperature (t j ) ....................................................... 150 c storage temperat ure rang e.........................................................................-65 c to 150 c package peak temp. for solder reflow (40 seconds 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 mlpq 16-pin 4mm x 4mm thermal resistance - junction to a mbient , ja 24.6 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. package pin out e msc 1704 xxxx 1 2 3 49 10 11 12 pvss1 vdd in1+ in1- pvss2 out2+ pvdd2 out2- pvss3 out1+ pvdd1 out1- in2- in2+ vss en 13 14 15 16 567 8 lq p ackage (top view) rohs / pb-free 100% matte tin lead finish xxxx = date/lot code functional pin description name description vss negative supply to analog stage (ground) in1- negative audio input channel 1 in1+ positive audio input channel 1 en enable pin, active high in2- negative audio input channel 2 in2+ positive audio input channel 2 vdd analog positive power supply pvss1 pvss2 pvss3 negative supply to negative output stage (ground) for channel1 out1+ positive audio (pwm) output for channel 1 pvdd1 & pvdd2 positive supply to positive output stage for channel 1 out1- negative audio (pwm) output for channel 1 out2+ positive audio (pwm) output channel 2 out2- negative audio (pwm) output channel 2 p p a a c c k k a a g g e e d d a a t t a a
lx1704 p roduction d ata s heet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, 800-877-6458, fax: 714-893-2570 page 3 www. microsemi . com 2w filter less stereo class-d amplifier tm ? copyright ? 2009 rev.1.4, 2009-02-23 system characteristics the following specifications apply over the operating ambient temperature 0 < t a < 70c except where otherwise noted and the following test conditions: pvdd = vdd = 5.0v, pvss = vss = 0v, rl = 4 ? lx1704 parameter symbol test conditions min typ max units supply current: quiescent i qq no load 2.5 5 ma supply current: shutdown mode i qqsd disable pin active 1 a thd+n = 1% 2.4 vdd = pvdd = 5v, fin = 1khz thd+n = 10% 3.3 thd+n = 1% 0.9 output power @ 4 ohms p q vdd = pvdd = 3.3v, fin = 1khz thd+n = 10% 1.2 w power efficiency vdd = pvdd = 5v, fin = 1khz 85 % total harmonic distortion @ 50% of maxim power thd_n vdd = pvdd = 5v, fin = 1khz, r l = 4 ? 0.1 % signal to noise ratio snr vdd = pvdd = 5v, f = 1khz, p o = 1w, a- weighted 90 db output noise floor v n input grounded a-weighted 20 to 20khz 100 v rms frequency response lower corner frequency f lo 3db relative to 1khz 20 20k hz frequency response vdd = pvdd = 2.5 to 5.5v, rl = 4 ? , p o = 200mw @ 20 to 80khz, filter less 3 db power supply rejection ratio psrr input referred, vdd = pvdd = 2.5v to 5.5v 55 60 db common mode rejection ratio cmrr vdd = pvdd = 2.5v to 5.5v 55 60 db gain g sys 20 db e e l l e e c c t t r r i i c c a a l l s s
lx1704 p roduction d ata s heet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, 800-877-6458, fax: 714-893-2570 page 4 www. microsemi . com 2w filter less stereo class-d amplifier tm ? copyright ? 2009 rev.1.4, 2009-02-23 electrical characteristics the following specifications apply over the operating ambient temperature 0 < t a < 70c except where otherwise noted and the following test conditions: pvdd = vdd = 5.0v, pvss = vss = 0v, rl = 4 ? lx1704 parameter symbol test conditions min typ max units supply voltage vdd pvdd 2.5 5.5 v oscillator frequency f sw vdd = pvdd = 2.5 to 5.5v 200 khz vdd = pvdd = 5v 2.5 5 supply current: quiescent i qq no load vdd = pvdd = 3.3v 2 4 ma supply current: shutdown mode i qqsd disable pin active 1 a power supply rejection ratio psrr vdd = pvdd = 2.5v to 5.5v 55 60 db input resistance r in vdd = pvdd = 2.5v to 5.5v single ended 18 k ? output dc offset v off input shorted to gnd -50 +50 mv p channel 350 vdd = pvdd = 5v n channel 350 p channel 470 vdd = pvdd = 3.3v n channel 470 p channel 600 static drain-to-source on- resistance rdson vdd = pvdd = 2.5v n channel 600 m ? stage gain g h vdd = pvdd = 2.5v to 5.5v 9 10 11 v/v thermal indicator junction t j 150 c under voltage threshold level v dd 1.8 2.0 2.2 v enable threshold en 2.10 2.25 2.40 v e e l l e e c c t t r r i i c c a a l l s s
lx1704 p roduction d ata s heet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, 800-877-6458, fax: 714-893-2570 page 5 www. microsemi . com 2w filter less stereo class-d amplifier tm ? copyright ? 2009 rev.1.4, 2009-02-23 simplified block diagram vinp vinn vdd vss en pvss2 pvss1 outn outp pvdd1 pvdd2 de-pop signal ground generation dynamic pulse generation triangle wave generator driver driver lp lp lx1704 figure 1 ? lx1704 simplified block diagram (half circuit) b b l l o o c c k k d d i i a a g g r r a a m m
lx1704 p roduction d ata s heet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, 800-877-6458, fax: 714-893-2570 page 6 www. microsemi . com 2w filter less stereo class-d amplifier tm ? copyright ? 2009 rev.1.4, 2009-02-23 system test setup audio precision system one audio precision system one power supply output1- output1+ input1- input1+ in1- in1+ out1+ out1- + c1 tp1- tp1+ gnd lx1704 evaluation kit in2- in2+ output2- output2+ 2nd order rc lpf 2nd order rc lpf out2+ out2- tp2- tp2+ 2nd order rc lpf 2nd order rc lpf lx1704 input2- input2+ vbat gnd - figure 2 ? typical evaluation test setup circuit default settings: equipments: audio precision system 1 oscilloscope, power supply ~ +5v; supply voltage: 2.5v / 3.3v / 5.0v 3 corner voltages on-board passive lpf: 40khz cut off frequency ( -6db) ap settings: 10hz ~ 22khz bpf a a p p p p l l i i c c a a t t i i o o n n s s
lx1704 p roduction d ata s heet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, 800-877-6458, fax: 714-893-2570 page 7 www. microsemi . com 2w filter less stereo class-d amplifier tm ? copyright ? 2009 rev.1.4, 2009-02-23 application circuits for test purposes only for test purposes only for test purposes only r7 470 c2 1f part pvss1 vdd in1+ in1- in2- in2+ vss en out2- pvdd2 out2+ pvss2 out1+ pvdd1 out1- pvss3 lx1704 c3 0.47f c4 0.47f j1 inr+ inr- jp1 tp2 v in c1 47f tp1 +vin rtn c5 0.47f c6 0.47f j2 inl+ inl- jp2 v in tp1 tp4 enable c8 1f v in tp8 tp7 r8 470 c15 4700pf c16 2200pf tp12 r5 470 r6 470 c14 4700pf c13 2200pf tp11 outl- outl+ tb3 r3 470 r4 470 c19 4700pf c10 2200pf tp10 r1 470 r2 470 c12 4700pf c11 2200pf tp9 outr+ outr- tb2 tp6 c7 1f tb1 tp5 for test purposes only figure 3 ? typical lx1704 application a a p p p p l l i i c c a a t t i i o o n n s s
lx1704 p roduction d ata s heet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, 800-877-6458, fax: 714-893-2570 page 8 www. microsemi . com 2w filter less stereo class-d amplifier tm ? copyright ? 2009 rev.1.4, 2009-02-23 functional description g eneral d escription the lx1704 is a filterless, low-emi, class-d audio power amplifier. it offers high performance (thd+n is just 0.1% @ 2w), high efficiency (>85% @ 1.2w), and best in class emi radiation (just 20dbv/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 lx1704 may be operated w ith just a single decoupling capacitor. f ilterless 3-l evel c lass -d m odulation the lx1704 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 v dd 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 audio signal. this type of modulation can be described as driving +v dd , -v dd , and 0v across the speaker which is why it is referred to as 3-level modulation. classical, 2-level modulation drives either +v dd or ?v dd 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 lc filters or ferrite beads located close to the ampl ifier. in the lx1704, the output stage has been carefully 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 ove rshoot which occurs at each transition. these two techniques allow the lx1704 to easily meet fcc standards fo r radiated emissions when driving up to 3 meters of speaker wire. 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 pulse width modulation 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 is fixed by internal resistors at 20db. the differential signal path and internal voltage boosters allow for wide dynamic range. in fact, the lx1704 can be operated from supplies as low as 2.5v and as high as 5.5v. the output power will be limited by the available supply voltage. an internal thermal sensing circuit shuts down the outputs when the junction temperature exceeds about 150c to provide thermal overload protection. a a p p p p l l i i c c a a t t i i o o n n s s
lx1704 p roduction d ata s heet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, 800-877-6458, fax: 714-893-2570 page 9 www. microsemi . com 2w filter less stereo class-d amplifier tm ? copyright ? 2009 rev.1.4, 2009-02-23 thd+n vs. power thd+n vs. frequency gain response noise floor channel crosstalk iqq vs. supply voltage 0 0.5 1 1.5 2 2.5 3 3.5 2.5 3 3.5 4 4.5 5 5.5 supply voltage (v) iqq (ma) pvdd=vdd; no input no load 4 ohm load g g r r a a p p h h s s
lx1704 p roduction d ata s heet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, 800-877-6458, fax: 714-893-2570 page 10 www. microsemi . com 2w filter less stereo class-d amplifier tm ? copyright ? 2009 rev.1.4, 2009-02-23 supply current vs output power psrr output power (mw) current (ma) 0 100 200 300 400 500 600 700 800 900 0 200 400 600 800 1000 1200 1400 1600 1800 2000 pvdd = vdd = 5v; r l = 4 ohms; both channels driven output power vs supply voltage supply voltage (v) power/ch (mw) 0 500 1000 1500 2000 2500 3000 3500 2.5 3 3.5 4 4.5 5 5.5 pvdd = vdd; f in = 1khz; r l = 4 ohms thd + n = 1% thd + n = 10% g g r r a a p p h h s s
lx1704 p roduction d ata s heet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, 800-877-6458, fax: 714-893-2570 page 11 www. microsemi . com 2w filter less stereo class-d amplifier tm ? copyright ? 2009 rev.1.4, 2009-02-23 package dimensions lq 16-pin mlpq plastic (4mm x 4mm ep / 114x114cu exposed pad) e d e b e2 d2 a a3 a1 l k pin 1 indicator or 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 0.18 0.30 0.007 0.012 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
lx1704 p roduction d ata s heet microsemi analog mixed signal group 11861 western avenue, garden grove, ca. 92841, 714-898-8121, 800-877-6458, fax: 714-893-2570 page 12 www. microsemi . com 2w filter less stereo class-d amplifier tm ? copyright ? 2009 rev.1.4, 2009-02-23 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 necessarily 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

▲Up To Search▲

Price & Availability of LX1704ILQ-TR

	To Download LX1704ILQ-TR Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .