p roduction d ata s heet microsemi integrated products 5973 avenida encinas, suite 101, carlsbad 92008, fax (760) 431-0541 page 1 copyright ? 2001 rev. 1.0,2002-05-08 www. microsemi . com lx1790 low voltage, low power, audiomite? class-d audio am p lifie r integrated products description description description description the msc-lx1790 offers a patent pending, low voltage, low power, and high efficiency amplifier for driving a hearing aid receiver. it comes with three programmable gain settings of 14db, 20db and 26db. the msc-lx1790 also comes with three output switch resistance settings to accommodate different receivers. it is delivered in bare die form. important: for the most current data, consult microsemi ?s website: http://www.microsemi.com key features key features key features key features low operating current: 100a typical low operating voltage: 0.9v minimum 3 gain settings: 14, 20 & 26db 3 output switch resistance settings: 48, 24 & 16 ? small form factor: 2.03mm 2 bare die applications applications applications applications hearing aid product highlight product highlight product highlight product highlight s peaker d in c lock p re a mp cmp h bridge simplified block diagram package order info package order info package order info package order info t j ( c) j cermic dip 14 -pin lm plastic dip 8-pin bd bare die 7-pin 10 to 55 lx1790cj LX1790CLM lx1790cbd l l x x 1 1 7 7 9 9 0 0
p roduction d ata s heet microsemi integrated products 5973 avenida encinas, suite 101, carlsbad 92008, fax (760) 431-0541 page 2 copyright ? 2001 rev. 1.0,2002-05-08 www. microsemi . com lx1790 low voltage, low power, audiomite? class-d audio am p lifie r integrated products absolute maximum rat absolute maximum rat absolute maximum rat absolute maximum ratings ings ings ings input logic supply voltage (v dd ) .............................................................. -0.3v to +3.0v operating temperature range........................................................................ 10c to 55c 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. package pin out package pin out package pin out package pin out pad locations are (x min , y min ) and are in m (100,952) (100,279) (100,100) (1590,105) (1590,349) (1590,609) (1590,818) imp sel in gain sel (0,0) v dd out p out n v ss bd (bottom view) 1 2 3 4 5 6 7 8 v ss out n imp sel in gain sel out p v dd lm p ackage (top view) 1 2 3 4 5 6 78 9 10 11 12 13 14 out n v ss imp sel in gain sel v dd out p j p ackage (top view) functional pin descr functional pin descr functional pin descr functional pin description iption iption iption p in n ame p in n o 8 p in lm p in n o 14 pin j d escription v dd 8 13 supply voltage v ss 1 2 ground in 5 8 analog audio input out p 7 14 positive output voltage out n 2 1 negative output voltage gain sel 6 9 gain select. see settings table below for selections. imp sel 3 6 output resistance select. see settings table below for selections. settings settings settings settings pin gain sel =vdd imp sel =vss gain sel =vss imp sel =vdd gain sel =floating imp sel =floating gain sel 14db 20db 26db imp sel 16 ? 24 ? 48 ? p p a a c c k k a a g g e e d d a a t t a a
p roduction d ata s heet microsemi integrated products 5973 avenida encinas, suite 101, carlsbad 92008, fax (760) 431-0541 page 3 copyright ? 2001 rev. 1.0,2002-05-08 www. microsemi . com lx1790 low voltage, low power, audiomite? class-d audio am p lifie r integrated products recommended operatin recommended operatin recommended operatin recommended operating conditions g conditions g conditions g conditions lx1790 parameter symbol test conditions min typ max units ! operating conditions supply voltage v dd 0.9 1.5 v ground v ss 0 v electrical character electrical character electrical character electrical characteristics istics istics istics unless otherwise specified, the following specifications apply over the operating ambient temperature t a =25c except where otherwise noted. test conditions: v dd =1.3v, v ss =0v, r load =200 ? in series with 60mh lx1790 parameter symbol test conditions min typ max units switch output resistance @ low drive r out-l 48 switch output resistance @ med drive r out-m 24 switch output resistance @ high drive r out-hi 16 19 ? quiescent current @ low drive iddq l 100 quiescent current @ med drive iddq m 110 quiescent current @ high drive iddq h 120 a 3db bandwidth ? mid frequency f min 40 100 hz 3db bandwidth ? max frequency f max all gain settings 20 khz output switching frequency f clk 200 khz gain setting 1 a 1 v in = 100mv rms @ 1khz 12 14 16 db gain setting 2 a 2 v in = 50mv rms @ 1khz 18 20 22 db gain setting 3 a 3 v in = 25mv rms @ 1khz 24 26 28 db power supply rejection ratio psrr input reference 45 db total harmonic distortion @ gain = 14db thd 14 v in = 50mv rms @ 1khz 0.3 % total harmonic distortion @ gain = 20db thd 20 v in = 25mv rms @ 1khz 0.3 % total harmonic distortion @ gain = 26bd thd 26 v in =12mv rms @ 1khz 0.3 % input referred noise v n-14 gain = 14db, 100hz ? 10khz, a-weighted 20 v input referred noise v n-20 gain = 20db, 100hz ? 10khz, a-weighted 10 v input referred noise v n-26 gain = 26db, 100hz ? 10khz, a-weighted 6 v input resistance r in-14 gain = 14db 120 k ? input resistance r in-20 gain = 20db 83 k ? input resistance r in-26 gain = 26db 53 k ? output clock frequency f clk 140 200 300 khz dc offset outn-outp v off-np no input signal -5 0 5 mv e e l l e e c c t t r r i i c c a a l l s s
p roduction d ata s heet microsemi integrated products 5973 avenida encinas, suite 101, carlsbad 92008, fax (760) 431-0541 page 4 copyright ? 2001 rev. 1.0,2002-05-08 www. microsemi . com lx1790 low voltage, low power, audiomite? class-d audio am p lifie r integrated products charts charts charts charts thd vs input level 0 0.5 1 1.5 2 2.5 3 3.5 4 0 20406080100 input [mvrms] thd [%] figure 1 ? thd vs. input level fin = 1khz, gain = 20db (note: clip level at 90mvrms) lx1790 h-bridge on impedance 0 5 10 15 20 25 30 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5 1.6 supply voltage ron [ohm] figure 2 ? h-bridge impedance vs. supply voltage (lowest impedance setting) c c h h a a r r t t s s
p roduction d ata s heet microsemi integrated products 5973 avenida encinas, suite 101, carlsbad 92008, fax (760) 431-0541 page 5 copyright ? 2001 rev. 1.0,2002-05-08 www. microsemi . com lx1790 low voltage, low power, audiomite? class-d audio am p lifie r integrated products mechanicals mechanicals mechanicals mechanicals bd 7-pin bare die (100,952) (100,279) (100,100) (1590,105) (1590,349) (1590,609) (1590,818) pad locations are (x min , y min ) and are in m (0,0) 1.15mm 1.78mm m illimeters i nches dim min max min max x 1.15 0.045 y 1.78 0.070 z 0.190 0.216 0.0075 0.0085 j 14-pin ceramic dip c h 1 b a g d f k l j m m illimeters i nches dim min max min max a 19.30 19.94 0.760 0.785 b 5.59 7.11 0.220 0.280 c - 5.08 - 0.200 d 0.38 0.51 0.015 0.020 f 1.02 1.77 0.040 0.070 g 2.54 bsc 0.100 bsc h - 2.03 - 0.080 j 0.20 0.38 0.008 0.015 k 3.17 5.08 0.125 0.200 l 7.37 7.87 0.290 0.310 m - 15 - 15 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
p roduction d ata s heet microsemi integrated products 5973 avenida encinas, suite 101, carlsbad 92008, fax (760) 431-0541 page 6 copyright ? 2001 rev. 1.0,2002-05-08 www. microsemi . com lx1790 low voltage, low power, audiomite? class-d audio am p lifie r integrated products mechanicals mechanicals mechanicals mechanicals lm 8-pin plastic mlp-micro exposed pad g a b f d c internally connected together, but isolated from all other terminals k j i e h m illimeters i nches dim min max min max a 2.90 3.10 0.114 0.122 b 2.90 3.10 0.114 0.122 c 0.65 0.75 0.025 0.029 d 0.15 0.25 0.005 0.009 e 1.841 bsc 0.075 bsc f 0.27 0.43 0.010 0.016 g 0.65 bsc 0.025 bsc h 1.22 bsc 0.048 bsc i 0 0.10 0 0.003 j 0.21 0.37 0.008 0.014 k 0 0.10 0 0.003 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
p roduction d ata s heet microsemi integrated products 5973 avenida encinas, suite 101, carlsbad 92008, fax (760) 431-0541 page 7 copyright ? 2001 rev. 1.0,2002-05-08 www. microsemi . com lx1790 low voltage, low power, audiomite? class-d audio am p lifie r integrated products notes notes notes 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
|
