TDA8705 Просмотр технического описания (PDF) - Philips Electronics

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TDA8705

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

TDA8705

FEATURES

• 2 times 6-bit resolution

• Sampling rate up to 40 MHz

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

frequency range (5.8 effective bits at 10 MHz full-scale

input at fclk = 40 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 TDA8705 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

40 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

analog supply voltage

4.75

VCCD

digital supply voltage

4.75

VCCO

output stages supply voltage

4.75

ICCA

analog supply current

20

ICCD

digital supply current

10

ICCO

output stages supply current

10

ILE

DC integral linear error

−

DLE

DC differential linearity error

−

AILE

AC integral linearity error

note 1

−

fclk(max)

maximum clock frequency

40

Ptot

total power dissipation

−

Note

1. Full-scale sine wave (fi = 10 MHz; fclk = 40 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

TDA8705T

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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