1996 Feb 01

2

Philips Semiconductors

Product specification

Triple RGB 6-bit video analog-to-digital

interface

TDA8707

FEATURES

• Triple analog-to-digital converter (ADC)

• 6-bit resolution

• Sampling rate up to 35 MHz

• Power dissipation of 335 mW (typical)

• Internal clamping function

• TTL compatible digital inputs

•−40 to +85 °C operating temperature

• CMOS digital outputs.

APPLICATIONS

• High-speed analog-to-digital conversion for video

signals

• VGA signal treatment.

DESCRIPTION

The TDA8707 is a CMOS triple 6-bit video low-power

analog-to-digital converter (ADC) for RGB signals.

It converts the analog inputs into 6-bit binary coded digital

words at a sampling rate of 35 MHz. All analog signal

inputs are clamped.

Analog-to-digital converter

The TDA8707 implements 3 independent 6-bit

analog-to-digital converters in CMOS process. These

converters use a full-flash approach.

Clamping feature

An internal clamping circuit is provided in each of the

3 analog channels. The analog pins INR, ING and INB are

switched, through series capacitors, to on-chip clamping

levels during an active pulse on the clamp input CLP.

Clamping level in the R, G and B channels is Code 0.

Input buffers

Internal buffers are provided to drive the analog-to-digital

converter inputs. Their ratio can be adjusted externally at

1.5 or 2.0 with select input SLT.

QUICK REFERENCE DATA

Notes

1. The number of effective bits is measured with a clock frequency of 35 MHz. This value is given for a 4.43 MHz

frequency on the R, G and B channels.

2. The external resistor (value 15 k

ORDERING INFORMATION

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

analog supply voltage

4.5

5.0

5.5

V

digital supply voltage

4.5

5.0

5.5

V

analog supply current

−

60

80

mA

digital supply current

−

58mA

INL

integral non-linearity

−±0.35 ±0.6

LSB

DNL

differential non-linearity

−±0.35 ±0.6

LSB

EB

effective bits

note 1

−

5.3

−

bits

maximum clock conversion rate

35

−−

MHz

total power dissipation

−

335

485

mW

TYPE

NUMBER

PACKAGE

NAME

DESCRIPTION

VERSION

TDA8707H

QFP44

plastic quad flat package; 44 leads; lead length 1.3 mm; body 10

× 10 × 1.75 mm SOT307-2