LS188 STMICROELECTRONICS | Alldatasheet
Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 3
Technical content
{57 S¢S-THOMSON MICROELECTRONICS LS188 MICROPHONE AMPLIFIER a VERY FEW EXTERNAL COMPONENTS internal reference and a current modulator stage = BUILT IN PARTIAL BRIDGE enabling the device to send the amplifier speech to = HIGH IMMUNITY AGAINST EMI the line. = ACCURATE GAIN CONTROL = NO CAPACITOR REQUIRED « WIDE OPERATING VOLTAGE AND CURRENT RANGE = PROGRAMMABLE DC CHARACTERISTICS MINIDIP
DESCRIPTION
The LS188 is a monolithic microphone amplifier designed to be used with several kinds of transdu- ORDER CODE : LS188CB cers. It can replace the carbon microphone in tele- phones and may also be used in cassette recorder, walky talkies, or infrared receiver applications. The circuit is assembled in a 8-pin Dual in Line Package. The LS188 consists of a differential input amplifier, PIN CONNECTION (top view) TD oc | | I] characteristics une [ ‘GROUND | i sna MIKE INPUT PROGRAMMATION f ! Tate November 1988 1/3 469
s) S [] O2 TT bali) wy) OUUY s-6905 TEST CIRCUIT 420.2 22pF See 125 2 >SH-1000 1 t—}f3 1 45 6 7 6 2 vad v tee “ $-620611 ABSOLUTE MAXIMUM RATINGS (Symbot] Parameter ——SSSCSC~sdCS eC] [vu | Micrphene Votage (ne duration) ———SCSCSC—~—~srSCSC“‘~sSSSCSC*‘d;SC CS [tu [Microphone Curent Etc [Pict | Power Dissipation | | THERMAL DATA [Finan] Thomal Resilance unctonambient SCM «Yt 23 a 28 _ gg sgg:mvompoyy) 470
2") ELECTRICAL CHARACTERISTICS (refer to the test circuit at 25 °C with f = 300 Hz to 3400 Hz (pins 5-6 floating), unless otherwise specified) [Symbol | ___ Parameter Test Conditions [ win. | Typ. [Max. | unit | G. | Sending Gain Var =1 mV f= 1 KHz 39.5 Im = 15 mA [_G___| Gain Spread vs. Temperature _| - 25 °C Tan = + 60°C [| +1 | 8 | Gain Spread vs. Polarity [iw=s15ma TT ft] 8 | Gain Spread vs. Line Current | Vi = 1 mV f=1 KHz ly = 7 to 60 mA Pa] Ire = 15 MA. Vi-z Microphone Voltage Im= 7MA Vv y= 15. mA s9 | v ly = 40 mA ass | Vv Differential Resistance and | Iy = 7 to 60 mA 120 Output Impedance [| Frequency Response [iwetsma Te Te |__| Sending Noise“ TVweo TT = 67 | cmp | [|__| input impedance | w=7t06oma 7 | 9.75 | 122 | ka | Distortion fret = 1 KHz. Iw = 71015MA Vo =04V 2 ly = 15 10 60 MA Vo = 1.25 V 7 [ta [Quiescent Curent TT TYPICAL GAIN VERSUS PIN 5 - 6 CONNECTION [ee | pag amar | [ Floating | a0saa | a7a8 Intermediate values of Gs are obtained by right resistors rom pins 5 or 6 to ground. . 33 471