MP4680 datasheet(2/28 Pages) PHILIPS

2 / 28 page

1996 Oct 25

Philips Semiconductors

Product speciﬁcation

Video processor with automatic cut-off

and white level control

TDA4680

FEATURES

• Operates from an 8 V DC supply

• Black level clamping of the colour difference, luminance

and RGB input signals with coupling-capacitor DC level

storage

• Two fully-controlled, analog RGB inputs, selected either

by fast switch signals or via I2C-bus

• Saturation, contrast and brightness adjustment via

I2C-bus

• Same RGB output black levels for Y/CD and RGB input

signals

• Timing pulse generation from either a 2 or 3-level

sandcastle pulse for clamping, horizontal and vertical

synchronization, cut-off and white level timing pulses

• Automatic cut-off control with picture tube leakage

current compensation

• Software-based automatic white level control or fixed

white levels via I2C-bus

• Cut-off and white level measurement pulses in the last

4 lines of the vertical blanking interval (I2C-bus selection

for PAL, SECAM, or NTSC, PAL-M)

• Increased RGB signal bandwidths for progressive scan

and 100 Hz operation (selected via I2C-bus)

• Two switch-on delays to prevent discolouration before

steady-state operation

• Average beam current and peak drive limiting

• PAL/SECAM or NTSC matrix selection via I2C-bus

• Three adjustable reference voltage levels (via I2C-bus)

for automatic cut-off and white level control

• Emitter-follower RGB output stages to drive the video

output stages

• Hue control output for the TDA4555, TDA4650/T,

TDA4655/T or TDA4657.

GENERAL DESCRIPTION

The TDA4680 is a monolithic integrated circuit with a

colour difference interface for video processing in TV

receivers. Its primary function is to process the luminance

and colour difference signals from multistandard colour

decoders, TDA4555, TDA4650/T, TDA4655/T or

TDA4657, Colour Transient Improvement (CTI) IC,

TDA4565, Picture Signal Improvement (PSI) IC,

TDA4670, or from a feature module.

The required input signals are:

• Luminance and negative colour difference signals

• 2 or 3-level sandcastle pulse for internal timing pulse

generation

• I2C-bus data and clock signals for microcontroller

control.

Two sets of analog RGB colour signals can also be

inserted, e.g. one from a peritelevision connector and the

other from an on-screen display generator; both inputs are

fully-controlled internally. The TDA4680 includes full

I2C-bus control of all parameters and functions with

automatic cut-off and white level control of the picture tube

cathode currents. It provides RGB output signals for the

video output stages.

There is a very similar IC TDA4681 available. The only

differences are in the NTSC matrix.

ORDERING INFORMATION

TYPE NUMBER

PACKAGE

NAME

DESCRIPTION

VERSION

TDA4680

DIP28

plastic dual in-line package; 28 leads (600 mil)

SOT117-1

TDA4680WP

PLCC28

plastic leaded chip carrier; 28 leads

SOT261-2

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