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BA7781K

Rohm

Stereo microphone amplifier for camcorders

Video ICs Stereo microphone amplifier for camcorders BA7781K The BA7781K allows construction of a stereo-microphone amp...



BA7781K

Rohm


Octopart Stock #: O-179245

Findchips Stock #: 179245-F

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Description
Video ICs Stereo microphone amplifier for camcorders BA7781K The BA7781K allows construction of a stereo-microphone amplifier for camcorder use with a minimum number of external components. The IC has a built-in wind-noise detection circuit, and wind-noise rejection filter. The filter circuit is controlled automatically. The IC can operate off a 3
More View .0V power supply. Applications • Camcorders Features • 1) Operates off a 3.0V to 5.25V power supply. 2) Automatic wind-noise rejection circuit. 3) Matrix circuit for stereo emphasis. 4) Automatic switching circuit for external microphones, built-in external monaural decision circuit, and input switch mode decision circuit. •Block diagram MTX OUT L PRE OUT L INV OUT L MTX IN L MODE 24 HPF IN L 18 WND 15dB DET NOR INV IN L 24 EXT IN L 25 EXT BG 26 INT IN L 27 GND REG GND 28 VREG 29 INT 23 22 21 20 19 17 16 DET OUT 15 DET IN 14 BIAS BIAS VCC 13 VCC 12 LPF INV OUT – + 13dB + – MIX 10dB EXT + – BIAS INT IN R 30 RIPL 31 INT OUT L 11 LPF INV IN 10 MIX OUT 09 MIC MONO 08 OUT R EXT 13dB NOR WND 06 MTX OUT R EXT IN R 32 EXT 01 MODE 1 02 PRE OUT R 03 INV IN R 04 INV OUT R + – 05 MTX IN R 15dB 07 HPF IN R 1 Video ICs BA7781K •Absolute maximum ratings (Ta = 25°C) Parameter Power supply voltage Power dissipation Operating temperature Storage temperature Symbol VCC Pd Topr Tstg Limits 7.0 400∗ – 10 ~ +70 – 55 ~ +125 Unit V mW °C °C •Recommended operating conditions (Ta = 25°C) Parameter Power supply voltage Symbol VCCS Min. 3.0 Typ. — Max. 5.25 Unit V CC ∗ Reduced by 4mW for each increase in Ta of 1°C over 25°C. •Electrical characteristics (unless otherwise noted, Ta = 25°C and V Parameter Current dissipation 1 Current dissipation 2 Preamplifier gain Output amplifier gain Distortion Maximum output voltage Output noise voltage Input switch separation Interchannel separation Internal microphone power supply voltage Input switch control voltage Symbol I INT IEXT VGPR VGOA THD Vom VNO CTI→E CTL← →R = 3.3V) Unit mA mA dB dB % Vrms dBV dB dB V V V Conditions INT MIC IN, L / Rch No dissipation by mic EXT MIC IN, L / Rch No dissipation by mic 30 / 32pin→2pin GAIN 27 / 25pin→23pin GAIN 3 / 6 / 7pin→8pin GAIN 22 / 19 / 18pin→17pin GAIN INT / EXT, Vo = 300mVrms, L / Rch∗2 INT / EXT MIC IN, L / Rch f = 1kHz (distortion 1%∗2 ) INT / EXT, L / Rch, Rg = 1kΩ When gain is 28dB∗1 INT→EXT MIC IN, Rg = 1kΩ, L / Rch (distortion 1%∗2 ) , when gain is 28dB∗1 INT / EXT MIC, Lch→Rch, Rg = 1kΩ (distortion 1%∗2 ) , when gain is 28dB∗1 Pin 27 output voltage for 30kΩ load “H”level, 1 / 24 pin DC “L” level, 1 / 24 pin DC Input 80Hz signal to pin 15, and measure gain at switch off side.∗1 Min. — — 12 14 — 0.85 — — — 2.3 1.6 0 Typ. 5.0 4.8 13 15 0.05 1.1 – 90 – 88 – 61 2.5 — — Max. 8.0 8.0 14 16 0.3 — – 80 – 70 – 50 2.75 VCC 0.6 VREG VHSWH VHSWL High-pass filter switch






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