TDA8705AT datasheet(2/16 Pages) PHILIPS

2 / 16 page

1996 Jan 12

Philips Semiconductors

Product speciﬁcation

6-bit high-speed dual Analog-to-Digital

Converter (ADC)

TDA8705A

FEATURES

• 2 times 6-bit resolution

• Sampling rate up to 80 MHz

• High signal-to-noise ratio over a large analog input

frequency range (5.5 effective bits at 20 MHz full-scale

input at fclk = 80 MHz)

• TTL output

• Two separated inputs (AC-coupling)

• TTL compatible digital inputs

• Low-level AC clock input signal allowed

• Internal reference voltage regulator

(external reference regulation possible)

• Power dissipation only 250 mW (typical)

• Low analog input capacitance, no buffer amplifier

required

• No sample-and-hold circuit required.

APPLICATIONS

High-speed analog-to-digital conversion for:

• DBS (Digital Broadcast Satellite)

• QPSK (Quadrature Phase Shift Keying) demodulation

• Video.

GENERAL DESCRIPTION

The TDA8705A is a 6-bit high-speed dual analog-to-digital

converter (ADC) for satellite video and other applications.

It converts the two analog input signals into two 6-bit

binary-coded digital words at a maximum sampling rate of

80 MHz. All digital inputs and outputs are TTL compatible,

although a low-level sine wave clock input signal is

allowed.

QUICK REFERENCE DATA

Note

1. Full-scale sine wave (fi = 20 MHz; fclk = 80 MHz).

ORDERING INFORMATION

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

VCCA

analog supply voltage

4.75

5.0

5.25

VCCD

digital supply voltage

4.75

5.0

5.25

VCCO

output stages supply voltage

4.75

5.0

5.25

ICCA

analog supply current

ICCD

digital supply current

ICCO

output stages supply current

ILE

DC integral linear error

−±0.25

±0.5

LSB

DLE

DC differential linearity error

−±0.25

±0.5

LSB

AILE

AC integral linearity error

note 1

−±0.5

±1.0

LSB

fclk(max)

maximum clock frequency

−−

MHz

Ptot

total power dissipation

−

250

−

TYPE

NUMBER

PACKAGE

NAME

DESCRIPTION

VERSION

TDA8705AT

SO28

plastic small outline package; 28 leads; body width 7.5 mm

SOT136-1

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