TDA8050 View Datasheet(PDF) - Philips Electronics

Part Name

Description

Manufacturer

TDA8050

QPSK transmitter

Philips Electronics 

Philips Semiconductors

QPSK transmitter

Product specification

TDA8050

FEATURES

• Programmable gain

• PLL controlled carrier frequency

• 3-wire transmission bus

• 5 V supply voltage.

APPLICATIONS

• QPSK modulation.

GENERAL DESCRIPTION

The Quadrature Phase Shift Keying (QPSK) transmitter is

a monolithic bipolar IC dedicated for quadrature

modulation of the I and Q signals. It includes:

• Two double-balanced mixers

• Symmetrical Voltage Controlled Oscillator (VCO) with

0 to 90 degree signal generation for modulation

• Phase-Locked Loop (PLL) for IF frequency control

• Conversion mixer

• PLL for RF frequency control

• Gain controlled output amplifier

• 3-wire bus and an output buffer.

Two PLLs are incorporated, the first PLL includes:

• Fixed main divider

• Crystal oscillator and its programmable reference

divider

• Phase/frequency detector combined with a fixed charge

pump.

The second PLL includes:

• Divide-by-four preamplifier

• 12-bit programmable divider

• Crystal oscillator and its programmable reference

divider

• Phase/frequency detector combined with a ‘clever’

charge pump which drives the tuning amplifier, including

9 V output.

QUICK REFERENCE DATA

SYMBOL

VCC

fc

Vo(max)

fxtal

fref(MOD)

fstep

Tamb

PARAMETER

supply voltage

output centre frequency

maximum output level

crystal frequency

reference frequency for modulator synthesizer

frequency step size for convertor synthesizer

operating ambient temperature

MIN.

4.75

5

−

1

−

50

0

TYP.

5.00

−

55

−

250

−

−

MAX.

5.25

40

−

4

−

500

70

UNIT

V

MHz

dBmV

MHz

kHz

kHz

°C

ORDERING INFORMATION

TYPE

NUMBER

TDA8050T

NAME

SO32

PACKAGE

DESCRIPTION

plastic small outline package; 32 leads; body width 7.5 mm

VERSION

SOT287-1

1999 Dec 14

2

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