TDA8707 Просмотр технического описания (PDF) - Philips Electronics

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TDA8707

Triple RGB 6-bit video analog-to-digital interface

Philips Electronics 

Philips Semiconductors

Triple RGB 6-bit video analog-to-digital

interface

Product specification

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

SYMBOL

PARAMETER

CONDITIONS

MIN. TYP. MAX. UNIT

VDDA

VDDD

IDDA

IDDD

INL

DNL

EB

fclk

Ptot

analog supply voltage

digital supply voltage

analog supply current

digital supply current

integral non-linearity

differential non-linearity

effective bits

maximum clock conversion rate

total power dissipation

4.5

4.5

−

fclk = 35 MHz

−

fclk = 35 MHz; ramp input; −

Tamb = 25 °C

fclk = 35 MHz; ramp input; −

Tamb = 25 °C

note 1

−

35

fclk = 35 MHz; note 2

−

5.0 5.5 V

5.0 5.5 V

60

80

mA

5

8

mA

±0.35 ±0.6 LSB

±0.35 ±0.6 LSB

5.3 −

bits

−

−

MHz

335 485 mW

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 kΩ) between VDDA and CLREF, fixing internal static currents, influences Ptot.

ORDERING INFORMATION

TYPE

NUMBER

TDA8707H

NAME

QFP44

PACKAGE

DESCRIPTION

VERSION

plastic quad flat package; 44 leads; lead length 1.3 mm; body 10 × 10 × 1.75 mm SOT307-2

1996 Feb 01

2

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