ICs for TV AN5285K Sound level automatic gain control IC ■ Overview Unit: mm 10 1.778 18.24±0.3 0.5 1.1 The AN5285K is a stereo automatic volume control IC for reducing a difference in volume between broadcasting stations and between programs. It is a kind of AGC circuit and reduces a sudden change in sound signal amplitude by using a proper time constant. ■ Features 3.0±0.3 1.65±0.25 1.1±0.25 (12.0) 3.5±0.25 +0.1 6.0±0.3 0.25 –0.05 1 • 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 monaural sound system) by two VCAs SSIP010-P-0000 ■ Applications • Televisions and video sets 4 V CC ■ Block Diagram 3 LOUT LIN 1 VCA Level sensor 1 50 kΩ SW CTL 7 CTL Level sensor 1 RIN 10 VCA 8 ROUT 50 kΩ Level sensor 2 GND 6 VREF 5 LS1 2 LS2 9 V/l reg. 1 AN5285K ICs for TV ■ Absolute Maximum Ratings Parameter Symbol Rating Unit Supply voltage VCC 13.0 V Supply current ICC 30 mA Power dissipation PD 390 mW Operating ambient temperature * Topr −20 to +75 °C Storage temperature * Tstg −55 to +150 °C Note) * : Except for the operating ambient temperature, and storage temperature, all ratings are for Ta = 25°C. ■ Recommended Operating Range Parameter Supply voltage Symbol Range Unit VCC 8.5 to 12.5 V ■ Electrical Characteristics at VCC = 12 V, fIN = 1 kHz, Ta = 25°C Parameter Symbol Min Typ Max Unit 5 10 15 mA Supply current * ICC Without input signal Input and output level 1 * V1 VIN = 1 mV[rms] 0.7 1.0 1.4 mV[rms] Input and output level 2 * V2 VIN = 50 mV[rms] 80 110 140 mV[rms] Input and output level 3 * V3 VIN = 200 mV[rms] 150 200 250 mV[rms] Input and output level 4 * V4 VIN = 1 V[rms] 200 280 360 mV[rms] Input and output level 5 V5 VIN = 100 mV[rms], Vctl = 2.5 V 50 100 150 mV[rms] Input and output level 6 V6 VIN = 300 mV[rms], Vctl = 4.5 V 230 300 370 mV[rms] VIN = 200 mV[rms] 0.1 0.5 % No input signal (with IHF-A) 100 µV[rms] Vmax Input level at THD = 1% 2.8 V[rms] Crosstalk between channels GT VIN = 2 V[rms], AGC off 60 dB AGC OFF voltage VSW VIN = 1 V[rms], Vctl = 1.2 V 890 CB VIN = 200 mV[rms] −1.0 0 1.0 dB FC VIN = 200 mV[rms] Level difference of fIN = 1 kHz/20 kHz −1.0 0 1.0 dB V7 VIN = 200 mV[rms], AGC off 175 200 225 mV[rms] Total harmonic distortion * Noise level * Channel balance THD Vn Maximum input level * * Frequency characteristics Input and output level 7 Note) * : Vctl = 3.5 V. 2 Conditions * 1 000 1 130 mV[rms] ICs for TV AN5285K ■ Terminal Equivalent Circuits Pin No. Equivalent circuit Description 1 LIN: Left side input pin Voltage 6V 200 Ω 1 50 kΩ 1/2 VCC 2 Level 1 430 Ω Level 2 CTL LSI: AGC level sensor 1 and 2 0.5 V to 1.5 V 20 kΩ 2 3 143 Ω LOUT: Left side output pin 6V VCC : VCC pin VREF : Reference voltage stability 6V GND: GND pin 3 143 Ω 4 5 50 kΩ 5 200 Ω 50 kΩ 6 3 AN5285K ICs for TV ■ Terminal Equivalent Circuits (continued) Pin No. Equivalent circuit Description 7 96 kΩ Voltage CTL: AGC on/off changeover AGC off at 1.2 V or lower ROUT: Right side output pin 6V LS2: AGC level sensor 2 6V RIN: Right side input pin 6V 20 kΩ 20 kΩ 200 Ω 7 40 kΩ 8 143 Ω 8 143 Ω 9 18 kΩ 900 Ω 250 Ω 1/2 VCC 9 10 200 Ω 10 50 kΩ 1/2 VCC 4 ICs for TV AN5285K 4 VCC ■ Application Circuit Example 4.7 µF 8 4.7 µF LOUT Level sensor 1 50 kΩ SW CTL 7 CTL Level sensor 1 10 VCA ROUT 50 kΩ Level sensor 2 GND 6 10 µF VREF 5 4.7 µF 2.2 MΩ 10 µF LS1 2 V/l Reg. LS2 9 4.7 µF RIN 4.7 µF VCA 10 kΩ 24 kΩ LIN 1 3 5