01W016A Stereo microphone amplifier for camcorder BH7871FV Dimension (Units : mm) 6.5±0.2 11 1. 15±0.1 1 0.65 0.15±0. 1 4.4±0.2 6.4±0.3 20 0. 1 Description BH7871FV is a stereo microphone amplifier for camcorder. Matrix circuit to emphasize stereo sound, microphone element power regulator, and filter to eliminate the wind noise all are incorporated in this IC. Low operating voltage of 2.7V and small SSOP-B20 package are other merits of this product. 10 0.22±0. 1 0.3Min. 0. 1 Features 1) Low power consumption 2) Low input noise 3) Microphone element power regulator and filter circuit for eliminating wind noise are incorporated into a single chip. 4) Built-in matrix circuit to enhance the stereo sound. SSOP-B20 Applications Camcorder Absolute Maximum Ratings (Ta=25˚C) Parameter Applied voltage Power dissipation Operating temperature range Storage temperature range Symbol Vcc Pd Topr Tstg Limits 4.0 640 * –10 ~ +70 –55 ~ +125 Unit V mW ˚C ˚C *Derating : 6.4mW/˚C for operation above Ta=25˚C April, 2001 Recommended Operating Conditions (Ta=25˚C) Parameter Supply voltage Symbol Min. Typ. Max. Unit VCC 2.7 3.0 3.3 V Electrical characteristics (Unless otherwise noted, Ta=25˚C, Vcc=3.0V, 20pin=H or OPEN, Input signal level=–38.5dBV, measurement pin=9,12pin, *1 JIS-A Filter, *2 400 ~30kHz Filter) Parameter Typ. Max. Unit IMONO Min. – – 2.6 2.0 3.9 3.0 mA mA No Input No Input GV 16.0 19.0 22.0 dB VIN=–38.5dbV, f=1kHz *2 THD VOM – 0.05 0.5 % VIN=–38.5dbV, f=1kHz *2 –9.2 –6.2 – dBV Symbol Consumption current (ST) IST Consumption current (MONO) Voltage gain Distortion rate Maximum output level Conditions THD=1%, f=1kHz *2 Rg=1kΩ *1 Vin=–38.5dBV, f=1kHz, (4⇔17) VON – –98 –90 Gain difference of inverter out L/R GVINVLR –1 0 1 dBV dB Internal microphone power supply output voltage VREG 2.3 2.5 2.75 V 3pin output voltage (30kΩ loaded) VTHHPFH VTHHPFL 2.2 – Vcc V HPF OFF, 18PIN DC 0 – 0.5 V HPF ON, 18PIN DC Output noise voltage HPF, CTL holding voltage *2 Application circuit + BIAS 21 20 1 BIAS 10µ VCC 2 GND 0.1µ 21 19 2 +13dB +6dB +6dB 0.068µ 17 4 5.6k 12k +6dB 0.33µ 18k 14 100µH 0dB HPF on HPF off HPF on Vcc 0dB OUT Vcc BH7871FV 11 0.1µ 10 + 100µ OUT + 1µ 0.022µ 12 9 ROUT 6.8k 0.015µ 13 8 33k 0 0.022µ HPF off 0.022µ 0.33µ 4700p + + – 7 0.022µ RCH SLEEP (MONO/ST) HPF CTRL 22k 15 6 0.015µ – 18k 0 4700p 6.8k 16 +6dB 5 22k 5.6k 0.068µ 33k LOUT + 12k HPF ON/OFF 20 18 + 3 10µ 2.2k PRE PRE REG 2.5V +13dB LIN 0.1µ 1µ 0.1µ + RIN 2.2k 100µ 100µH