AN5285K PANASONIC

Document overview

  • Manufacturer or author: Provided By digicamel.com
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Technical content

Sound level automatic gain control IC n Overview The AN5285K is a stereo automatic volume control IC for reducing a difference in volume between broad- casting stations and between programs. It is a kind of AGC circuit and reduces a sudden change in sound sig- nal amplitude by using a proper time constant. n Features

  • Sound level AGC function by VCA gain control
  • Prevention of S/N ratio degradation by reducing VCA gain at no signal (typ. 20 mV[rms] or less)
  • AGC function can be switched on and off externally.
  • Operating point of VCA gain lowering is adjustable by means of external resistor.
  • Usable for stereo sound system (also usable for monau- ral sound system) by two VCAs n Applications
  • Televisions and video sets SSIP010-P-0000 Unit: mm n Block Diagram 1.1±0.25 1.65±0.25 0.25 3.0±0.3 0.5 1.1 1.778 +0.1 –0.05 6.0±0.3 (12.0) 18.24±0.3 3.5±0.25 50 kW 50 kW V REF LS1 2 LS2 9 GND 6 VCA VCA CTL SW Level sensor 1 ROUT8 RIN 10 CTL 7 LIN 1 LOUT3 Level sensor 2 Level sensor 1 V/l reg. V CC

Parameter Symbol Rating Unit Supply voltage V CC 13.0 V Supply current I CC 30 mA Power dissipation P D 390 mW Operating ambient temperature * Topr -20 to +75 °C Storage temperature * T stg -55 to +150 °C Parameter Symbol Range Unit Supply voltage V CC 8.5 to 12.5 V n Recommended Operating Range Note) * : Except for the operating ambient temperature, and storage temperature, all ratings are for Ta = 25°C. n Absolute Maximum Ratings n Electrical Characteristics at VCC = 12 V, fIN = 1 kHz, Ta = 25°C Parameter Symbol Conditions Min Typ Max Unit Supply current * ICC Without input signal 5 10 15 mA Input and output level 1 * V1 V IN = 1 mV[rms] 0.7 1.0 1.4 mV[rms] Input and output level 2 * V2 V IN = 50 mV[rms] 80 110 140 mV[rms] Input and output level 3 * V3 V IN = 200 mV[rms] 150 200 250 mV[rms] Input and output level 4 * V4 V IN = 1 V[rms] 200 280 360 mV[rms] Input and output level 5 V5 V IN = 100 mV[rms], Vctl = 2.5 V 50 100 150 mV[rms] Input and output level 6 V6 V IN = 300 mV[rms], Vctl = 4.5 V 230 300 370 mV[rms] Total harmonic distortion * THD V IN = 200 mV[rms] ¾ 0.1 0.5 % Noise level * V n No input signal (with IHF-A) ¾¾ 100 mV[rms] Maximum input level * V max Input level at THD = 1% 2.8 ¾¾ V[rms] Crosstalk between channels GT V IN = 2 V[rms], AGC off 60 ¾¾ dB AGC OFF voltage V SW V IN = 1 V[rms], Vctl = 1.2 V 890 1 000 1 130 mV[rms] Channel balance * CB V IN = 200 mV[rms] -1.0 0 1.0 dB Frequency characteristics * FC V IN = 200 mV[rms] -1.0 0 1.0 dB Level difference of fIN = 1 kHz/20 kHz Input and output level 7 V7 V IN = 200 mV[rms], AGC off 175 200 225 mV[rms] Note) * :V ctl = 3.5 V.

Pin No. Equivalent circuit Description Voltage

1 LIN: 6 V

2 LSI: 0.5 V AGC level sensor 1 and 2 to 1.5 V

3 LOUT: 6 V

4 ¾ V CC : ¾ V CC pin 5V REF :6 V Reference voltage stability 6 ¾ GND: ¾ GND pin n Terminal Equivalent Circuits 200 W 50 kW 1/2 VCC 20 kW Level 1 Level 2 CTL 430 W 143 W 143 W 200 W 50 kW 50 kW

Pin No. Equivalent circuit Description Voltage

7 CTL: ¾

AGC off at 1.2 V or lower

8 ROUT: 6 V

9 LS2: 6 V

10 RIN: 6 V

n Terminal Equivalent Circuits (continued) 20 kW 200 W 20 kW 96 kW 40 kW 143 W 143 W 250 W 900 W 18 kW 1/2 VCC 200 W 50 kW 1/2 VCC

n Application Circuit Example 50 kW 24 kW10 kW 50 kW V REF 5 LS1 2 LS2 9 GND 6 VCA VCA CTL SW Level sensor 1 ROUT8 RIN 10 CTL 7 LIN 4.7 mF 1 LOUT3 Level sensor 2 Level sensor 1 V/l Reg. V CC 4.7 mF 4.7 mF 10 mF 10 mF 4.7 mF 2.2 MW 4.7 mF