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TDA8040T Datasheet

Quadrature demodulator

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INTEGRATED CIRCUITS
DATA SHEET
TDA8040T
Quadrature demodulator
Objective specification
Supersedes data of 1995 Feb 07
File under Integrated Circuits, IC02
1996 Oct 08


NXP Semiconductors Electronic Components Datasheet

TDA8040T Datasheet

Quadrature demodulator

No Preview Available !

Philips Semiconductors
Quadrature demodulator
Objective specification
TDA8040T
FEATURES
+5 V supply voltage
Bandgap internal reference voltage
Low crosstalk between I (in-phase) and Q (quadrature)
channel outputs
High operating input sensitivity
High Carrier-to-Noise Ratio (CNR) of the VCO.
APPLICATIONS
Quadrature Phase Shift Keying (QPSK) demodulation.
GENERAL DESCRIPTION
The TDA8040T is a monolitic bipolar IC dedicated for
quadrature demodulation.
It has been designed to operate in conjunction with the
TDA8041H to provide a complete QPSK demodulator.
The design of this circuit has been optimized to provide the
best quadrature accuracy necessary for digital receiver
applications and particularly for digital television.
The TDA8040T includes two matched mixers, an
RF amplifier, a symmetrical Voltage Controlled Oscillator
(VCO), a frequency divider and two matched amplifiers.
Two external filters are required for the baseband filtering.
The VCO requires an external LC tank circuit with two
varicap diodes. This oscillator operates at twice the
IF carrier frequency and can be used in a carrier recovery
AFC loop.
QUICK REFERENCE DATA
SYMBOL
VCC
ICC(tot)
Vi(RF)
fi(RF)
VolQ(p-p)
Eφ(IQ)
EG(IQ)
EG(tilt)
αct(IQ)
IM3
PARAMETER
supply voltage
total supply current
operating input voltage level
RF input signal frequency
I and Q output voltage
(peak-to-peak value)
phase error between the
I and Q channels
gain error between the
I and Q channels
gain tilt error in the I and Q channels
crosstalk between the
I and Q channels
intermodulation distortion in the
I and Q channels
CONDITIONS
VCC = 5 V
MIN.
4.5
70
64
10.7
30
40
TYP.
5.0
79
67
0.5
MAX.
5.5
90
70
150
UNIT
V
mA
dBµV
MHz
V
3 deg
1 dB
1 dB
dB
dB
ORDERING INFORMATION
TYPE NUMBER
TDA8040T
NAME
SO16
PACKAGE
DESCRIPTION
plastic small outline package; 16 leads; body width 3.9 mm
VERSION
SOT109-1
1996 Oct 08
2


Part Number TDA8040T
Description Quadrature demodulator
Maker NXP
Total Page 16 Pages
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