TDA8705A View Datasheet(PDF) - Philips Electronics

Part Name

Description

Manufacturer

TDA8705A

6-bit high-speed dual Analog-to-Digital Converter (ADC)

Philips Electronics 

Philips Semiconductors

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

Converter (ADC)

Product specification

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

SYMBOL

PARAMETER

CONDITIONS MIN.

VCCA

VCCD

VCCO

ICCA

ICCD

ICCO

ILE

DLE

AILE

fclk(max)

Ptot

analog supply voltage

digital supply voltage

output stages supply voltage

analog supply current

digital supply current

output stages supply current

DC integral linear error

DC differential linearity error

AC integral linearity error

maximum clock frequency

total power dissipation

note 1

4.75

4.75

4.75

20

10

10

−

−

−

80

−

Note

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

TYP.

5.0

5.0

5.0

27

14

14

±0.25

±0.25

±0.5

−

250

MAX.

5.25

5.25

5.25

32

18

18

±0.5

±0.5

±1.0

−

−

UNIT

V

V

V

mA

mA

mA

LSB

LSB

LSB

MHz

mW

ORDERING INFORMATION

TYPE

NUMBER

TDA8705AT

NAME

SO28

PACKAGE

DESCRIPTION

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

VERSION

SOT136-1

1996 Jan 12

2

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