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TDA8222

VIDEO & SOUND IF SYSTEM WITH VIDEO AND SOUND SWITCHES

STMicroelectronics 

TDA8222

Tuner AGC

It sinks a current to control the gain of the tuner RF

amplifier. Its starting point is adjusted by an external

potentiometer (Pin 1).

AFC Circuit

It is a FM demodulator stage which delivers on

Pin 19 a current proportional to the frequency dif-

ference between the IF input signal and the refer-

ence IF frequency of the external LC on Pin 20. This

current is converted into a voltage by means of a

resistor network.

FM Demodulation

It consists of a three stage limiter amplifier in order

to reject the amplitude modulation and a quadra-

ture demodulator. The deemphasis filter is built

with an internal resistor and an external capacitor

on Pin 11.

ABSOLUTE MAXIMUM RATINGS

Symbol

VS

VX

Tstg

Toper

Supply Voltage

Tuner AGC Voltage

Storage Temperature

Operating Temperature

Parameter

Mute Function

It is an internal switch to cut-off the internal audio

signal. It acts when a level below 2.1V is applied

on Pin 15. When no mute, the Pin 15 must be driven

with a high DC impedance.

Video and Audio Switches

They are both controlled by the Pin 21 voltage.

Internal sources or external sources can be sent to

the outputs (Pin 12 for video and Pin 8 for audio).

The internal signals are selected by a control level

below 2.5V on Pin 21, the external ones by a control

level above 5V.

The gain of the video switch is 6dB for both internal

and external signals.

The gain of the audio switch is 0dB for the maxi-

mum volume.

Value

13.5

VCC

-40, +150

0, +70

Unit

V

V

oC

oC

THERMAL DATA

Symbol

Rth (j-a)

Parameter

Junction-ambient Thermal Resistance

Max.

Value

75

Unit

oC/W

ELECTRICAL CHARACTERISTICS

(Tamb = 25oC, VCC = 9V, IF input = 10mVRMS top sync, D = 90%, Video BW = 5MHz,

Sound carrier input : 5.5MHz, 10mVRMS, fm = 1kHz, Audio BW = 20kHz, ∆f = ± 25kHz,

Volume attenuation = 0dB, Rload on Pin 12 = 1kΩ, unless otherwise specified)

Symbol

Parameter

Test Conditions

Min. Typ.

SUPPLY

VCC

Voltage Operating Range

ICC

Supply Current

IF AMPLIFIER

I(3) + I(4), VCC = 9V

8.1

9

24

38

Input Sensitivity

Refer to test circuit

70

R22-23 Differential Input Resistance

1.5

C22-23 Differential Input Capacitance

2

GR

Gain Control Range

64

DEMODULATED VIDEO OUTPUT (Pin 18)

VA18

VS18

BW

Amplitude

Top Sync Level

Bandwidth

Top sync to white

without output filter

See Figure 1

1.8

2.1

1.6

1.9

5

7

Max.

12.6

52

2.4

2.2

Unit

V

mA

µV

kΩ

pF

dB

VPP

V

MHz

3/9

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