TDA8360 datasheet(8/36 Pages) PHILIPS

8 / 36 page

March 1994

Philips Semiconductors

Objective speciﬁcation

Integrated PAL and PAL/NTSC TV

processors

TDA8360; TDA8361; TDA8362

VFB

vertical feedback input

VRAMP

vertical ramp generator

VOUT

vertical output

AFCOUT

AFC output

IFIN1

IF input 1

IFIN2

IF input 2

AGCOUT

tuner AGC output

DECAGC

AGC decoupling capacitor

TUNEADJ

tuner take-over adjustment

AUOUT

audio output

DECDEM

decoupling sound demodulator

DECBG

decoupling bandgap supply

SYMBOL

DESCRIPTION

TDA8360

The TDA8360 has the following

differences to the pinning:

Pin 6: external audio input not

connected

Pin 15: external CVBS input not

connected

Pin 16: chrominance and A/V switch

input not connected

Pin 27: hue control input not

connected.

TDA8361

The TDA8361 has the following

differences to the pinning:

Pin 1: only audio de-emphasis

Pin 27: only hue control

Pin 32: 4.43 MHz output for TDA8395

is not connected.

FUNCTIONAL DESCRIPTION

Video IF ampliﬁer

The IF amplifier contains

3 AC-coupled control stages with a

total gain control range of greater

than 60 dB. The sensitivity of the

circuit is comparable with that of

modern IF ICs.

The reference carrier for the video

demodulator is obtained by means of

passive regeneration of the picture

carrier. The external reference tuned

circuit is the only remaining

adjustment of the IC.

In the TDA8362 the polarity of the

demodulator can be switched so that

the circuit is suitable for both positive

and negative modulated signals.

The AFC circuit is driven with the

same reference signal as the video

demodulator. To ensure that the

video content does not disturb the

AFC operation a sample-and-hold

circuit is incorporated; the capacitor

for this function is internal. The AFC

output voltage is 6 V.

The AGC detector operates on levels,

top sync for negative modulated and

top white for positive modulated

signals.The AGC detector time

constant capacitor is connected

externally. This is mainly because of

the flexibility of the application.

The time constant of the AGC system

during positive modulation

(TDA8362) is slow, this is to avoid any

visible picture variations. This,

however, causes the system to react

very slowly to sudden changes in the

input signal amplitude.

To overcome this problem a speed-up

circuit has been included which

detects whether the AGC detector is

activated every frame period. If,

during a 3-frame period, no action is

detected the speed of the system is

increased. When the incoming signal

has no peak white information (e.g.

test lines in the vertical retrace period)

the gain would be video signal

dependent. To avoid this effect the

circuit also contains a black level

AGC detector which is activated when

the black level of the video signal

exceeds a certain level.

The TDA8361 and TDA8362 contain

a video identification circuit which is

independent of the synchronization

circuit. Therefore search tuning is

possible when the display section of

the receiver is used as a monitor. In

the TDA8360 this circuit is only used

for stable OSD at no signal input. In

the normal television mode the

identification output is connected to

the coincidence detector, this applies

to all three devices. The identification

output voltage is LOW when no

transmitter is identified. In this

condition the sound demodulator is

switched off (mute function). When a

transmitter is identified the output

voltage is HIGH. The voltage level is

dependent on the frequency of the

incoming chrominance signal.

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