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TDA8732

NICAM-728 demodulator (NIDEM)

Philips Electronics 

Philips Semiconductors

NICAM-728 demodulator (NIDEM)

Product specification

TDA8732

FEATURES

• 5 V supplies for analog and digital circuitry

• Low cost application

• Improved noise behaviour

• Limiting amplifier for QPSK input

• Suitable with PAL B, G and I NICAM-728 systems.

APPLICATIONS

• NICAM-728 systems.

QUICK REFERENCE DATA

Measured over full voltage and temperature ranges.

SYMBOL

PARAMETER

VCCA

analog supply voltage

VCCD

VCCA

VCCA−VCCD

digital supply voltage

analog supply voltage

differential supply voltage

ICCA

analog supply current

ICCD

digital supply current

V3

QPSK input level (peak-to-peak value)

RI

CI

fCAROSC

input resistance

input capacitance

carrier oscillator frequency

fXTAL

crystal frequency

PAL B, G

PAL I

fCLKOSC

clock oscillator frequency

fC5M

C5M output frequency

GENERAL DESCRIPTION

The NIDEM is a dedicated device providing a DQPSK

(Differential Quadrature Phase Shift Keying) demodulator

for a NICAM-728 system.

The device interfaces with NICAM-728 decoders and

provides data synchronized to a 728 kHz clock (either

supplied externally or by the on-board clock).

The device consists of a costas loop quadrature

demodulator, a bit-rate clock recovery and differential

decoder with parallel-to-serial conversion.

The Voltage Controlled Oscillator (VCO) used in the

costas loop is achieved with a single-pin crystal oscillator.

A second single-pin crystal oscillator with a divider chain

provides signals at 5.824 MHz and at 728 kHz.

The NIDEM is suitable for PAL B and G (carrier oscillator

crystal at 11.7 MHz) and PAL I (carrier oscillator crystal at

13.104 MHz).

MIN.

4.5

4.5

4.5

−0.5

−

−

30

1.75

−

11.5

TYP.

5

5

5

−

12.5

14.5

100

2.5

2

−

−

11.7

−

13.104

−

11.648

−

5.824

MAX.

5.5

5.5

5.5

0.5

−

−

300

3.25

−

13.5

UNIT

V

V

V

V

mA

mA

mV

kΩ

pF

MHz

−

MHz

−

MHz

−

MHz

−

MHz

ORDERING INFORMATION

EXTENDED

TYPE

NUMBER

TDA8732

PINS

20

Note

1. SOT146-1; 1996 December 3.

April 1993

PIN POSITION

DIL

PACKAGE

MATERIAL

plastic

2

CODE

SOT146(1)

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