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ICs for TV
AN5285K
Sound level automatic gain control IC
s Overview
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.
10
0.5 1.1 18.240.3
Unit: mm
s 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 monaural sound system) by two VCAs
6.00.3 (12.0)
1
0.25 -0.05 1.650.25 1.10.25
3.50.25
+0.1
1.778
SSIP010-P-0000
s Applications
* Televisions and video sets
4V CC
s Block Diagram
3 LOUT LIN 1 50 k CTL 7 VCA Level sensor 1 SW CTL Level sensor 1 RIN 10 50 k Level sensor 2 V/l reg. VCA
8 ROUT
LS2 9
LS1 2
VREF 5
GND 6
3.00.3
1
AN5285K
s Absolute Maximum Ratings
Parameter Supply voltage Supply current Power dissipation Operating ambient temperature * Storage temperature * Symbol VCC ICC PD Topr Tstg Rating 13.0 30 390 -20 to +75 -55 to +150
ICs for TV
Unit V mA mW C C
Note) * : Except for the operating ambient temperature, and storage temperature, all ratings are for Ta = 25C.
s Recommended Operating Range
Parameter Supply voltage Symbol VCC Range 8.5 to 12.5 Unit V
s Electrical Characteristics at VCC = 12 V, fIN = 1 kHz, Ta = 25C
Parameter Supply current * Input and output level 1 * Input and output level 2 * Input and output level 3 * Input and output level 4 * Input and output level 5 Input and output level 6 Total harmonic distortion * Noise level * Maximum input level
*
Symbol ICC V1 V2 V3 V4 V5 V6 THD Vn Vmax GT VSW CB
*
Conditions Without input signal VIN = 1 mV[rms] VIN = 50 mV[rms] VIN = 200 mV[rms] VIN = 1 V[rms] VIN = 100 mV[rms], Vctl = 2.5 V VIN = 300 mV[rms], Vctl = 4.5 V VIN = 200 mV[rms] No input signal (with IHF-A) Input level at THD = 1% VIN = 2 V[rms], AGC off VIN = 1 V[rms], Vctl = 1.2 V VIN = 200 mV[rms] VIN = 200 mV[rms] Level difference of fIN = 1 kHz/20 kHz VIN = 200 mV[rms], AGC off
Min 5 0.7 80 150 200 50 230 2.8 60 890 -1.0 -1.0 175
Typ 10 1.0 110 200 280 100 300 0.1
Max 15 1.4 140 250 360 150 370 0.5 100
Unit mA mV[rms] mV[rms] mV[rms] mV[rms] mV[rms] mV[rms] % V[rms] V[rms] dB
Crosstalk between channels AGC OFF voltage Channel balance
*
1 000 1 130 mV[rms] 0 0 200 1.0 1.0 225 dB dB mV[rms]
Frequency characteristics Input and output level 7
Note) * : Vctl = 3.5 V.
FC V7
2
ICs for TV
s Terminal Equivalent Circuits
Pin No. 1 Equivalent circuit Description LIN: Left side input pin
200
AN5285K
Voltage 6V
1
50 k 1/2 VCC
2
Level 1
Level 2
CTL
LSI: AGC level sensor 1 and 2
0.5 V to 1.5 V
430
20 k
2
3
143
LOUT: Left side output pin
6V
3
143
4 5
50 k 5 200
VCC : VCC pin VREF : Reference voltage stability
6V
50 k
6
GND: GND pin
3
AN5285K
s Terminal Equivalent Circuits (continued)
Pin No. 7
96 k 20 k 20 k 200 40 k 7
ICs for TV
Equivalent circuit
Description CTL: AGC on/off changeover AGC off at 1.2 V or lower
Voltage
8
143
ROUT: Right side output pin
6V
8
143
9
LS2: AGC level sensor 2
18 k 900 1/2 VCC 9
6V
250
10
RIN: Right side input pin
200 10 50 k
6V
1/2 VCC
4
ICs for TV
s Application Circuit Example
VCC
AN5285K
4
4.7 F LIN
3 1 VCA 50 k Level sensor 1 SW CTL Level sensor 1
4.7 F
LOUT
24 k 10 k
CTL 7
4.7 F RIN
10 50 k
VCA
8
4.7 F
ROUT
Level sensor 2 V/l Reg.
LS2 9
LS1 2
VREF 5
2.2 M
4.7 F
10 F
10 F
GND 6
5

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