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TDA8040T Datasheet(PDF) 2 Page - NXP Semiconductors

Part # TDA8040T
Description  Quadrature demodulator
Download  16 Pages
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TDA8040T Datasheet(HTML) 2 Page - NXP Semiconductors

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1996 Oct 08
2
Philips Semiconductors
Objective specification
Quadrature demodulator
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
ORDERING INFORMATION
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
VCC
supply voltage
4.5
5.0
5.5
V
ICC(tot)
total supply current
VCC = 5 V
70
79
90
mA
Vi(RF)
operating input voltage level
64
67
70
dB
µV
fi(RF)
RF input signal frequency
10.7
150
MHz
VolQ(p-p)
I and Q output voltage
(peak-to-peak value)
0.5
V
E
φ(IQ)
phase error between the
I and Q channels
−−
3
deg
EG(IQ)
gain error between the
I and Q channels
−−
1dB
EG(tilt)
gain tilt error in the I and Q channels
−−
1dB
α
ct(IQ)
crosstalk between the
I and Q channels
30
−−
dB
IM3
intermodulation distortion in the
I and Q channels
40
−−
dB
TYPE NUMBER
PACKAGE
NAME
DESCRIPTION
VERSION
TDA8040T
SO16
plastic small outline package; 16 leads; body width 3.9 mm
SOT109-1


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