Panasonic AN5285K Datasheet

ICs for TV

AN5285K

Sound level automatic gain control IC

■ 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.

■ 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

■ Applications

• Televisions and video sets

■ Block Diagram

0.5

1.778

+0.1

1.1

–0.05

0.25

Unit: mm

1.65±0.25

3.0±0.3

1.1±0.25

10

18.24±0.3

1

6.0±0.3

CC

V

3.5±0.25

(12.0)

SSIP010-P-0000

4

LIN

CTL

RIN

1

7

10

50 kΩ

50 kΩ

9

LS2

VCA

CTL

VCA

Level
sensor 2

2

LS1

Level
sensor 1

Level
sensor 1

V/l reg.

3

LOUT

SW

8

ROUT

5

REF

V

6

GND

1

AN5285K ICs for T V

■ Absolute Maximum Ratings

Parameter Symbol Rating Unit

Supply voltage V
Supply current I
Power dissipation P
Operating ambient temperature
Storage temperature

Note)*: Except for the operating ambient temperature, and storage temperature, all ratings are for Ta = 25°C.

*

*

CC

CC

D

T

opr

T

stg

■ Recommended Operating Range

Parameter Symbol Range Unit

Supply voltage V

CC

■ Electrical Characteristics at VCC = 12 V, fIN = 1 kHz, Ta = 25°C

Parameter Symbol Conditions Min Typ Max Unit

*

= 3.5 V.

ctl

*

*

*

*

*

*

I

Without input signal 5 10 15 mA

CC

V1 VIN = 1 mV[rms] 0.7 1.0 1.4
V2 VIN = 50 mV[rms] 80 110 140
V3 VIN = 200 mV[rms] 150 200 2 5 0
V4 VIN = 1 V[rms] 200 280 3 60

= 2.5 V 50 100 150

ctl

= 4.5 V 230 300 370

ctl

THD VIN = 200 mV[rms]  0.1 0.5 %

VnNo input signal (with IHF-A) 100 µV[rms]

*

*

*

V

Input level at THD = 1% 2.8 V[rms]

max

SWVIN

= 1 V[rms], V

= 1.2 V 890 1 000 1 130

ctl

CB VIN = 200 mV[rms] −1.0 0 1.0 dB
FC VIN = 200 mV[rms] −1.0 0 1.0 dB

Level difference of fIN = 1 kHz/20 kHz

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 V5 VIN = 100 mV[rms], V
Input and output level 6 V6 VIN = 300 mV[rms], V
Total harmonic distortion
Noise level
Maximum input level
Crosstalk between channels GT VIN = 2 V[rms], AGC off 60  dB
AGC OFF voltage V
Channel balance
Frequency characteristics

Input and output level 7 V7 VIN = 200 mV[rms], AGC off 175 200 225

Note)*:V

13.0 V
30 mA

390 mW

−20 to +75 °C

−55 to +150 °C

8.5 to 12.5 V

mV[rms]
mV[rms]
mV[rms]
mV[rms]
mV[rms]
mV[rms]

mV[rms]

mV[rms]

2