TDA8042M Datasheet, PDF (2/16 Pages) NXP Semiconductors – Quadrature demodulator

Philips Semiconductors
Quadrature demodulator
Product specification
TDA8042M
FEATURES
• 5 V supply voltage
• Internal voltage reference
• 350 to 650 MHz input frequency range
• On-chip 0° and 90° phase shifter
• Symbol rate up to 45 Msymbols/s
• High input sensitivity
• Built-in voltage stabilizer
• AGC amplifier with 21 dB control range
• AGC detector.
APPLICATION
• Binary Phase-Shift Keying (BPSK) and Quadrature
Phase-Shift Keying (QPSK) demodulation.
GENERAL DESCRIPTION
The TDA8042M is a monolitic bipolar IC dedicated for
BPSK and QPSK demodulation. It is designed to be used
together with the TDA8043 as part of a complete
BPSK/QPSK satellite demodulator and decoder.
The bandwidth of the TDA8042M allows symbol rates up
to 45 Msymbols/s. It includes two matched mixers, an IF
gain controlled amplifier, a symmetrical oscillator, a 0°/90°
phase shifter, two low-pass filters and two matched
baseband amplifiers.
The high input sensitivity makes interfacing with various
sources easy. The input sensitivity can be adjusted by
means of an internal AGC amplifier.
The oscillator operates at half the IF frequency. The local
oscillator signal driving the mixers is made by doubling the
oscillator frequency by an internal frequency multiplier.
The oscillator frequency can be set by the appropriate
external LC tank circuit. The internal wideband phase
shifter provides two oscillator signals which are
90 degrees out of phase to drive the mixers.
An AGC detector at the I and Q outputs makes it possible
to keep the I and Q signals at a constant level to drive the
analog-to-digital converters of the TDA8043.
QUICK REFERENCE DATA
SYMBOL
V_CC
I_CC
V_i(RF)
f_i(RF)
V_olQ(p-p)
∆E_Φ(I-Q)
∆E_G(I-Q)
∆G_tilt
PARAMETER
supply voltage
supply current
operating input level
RF input signal frequency
I and Q output voltage (peak-to-peak value)
phase matching error between I and Q channels
gain matching error between I and Q channels
gain tilt error between I and Q channels
CONDITIONS MIN.
4.75
V_CC = 5.0 V 54
−
350
−
−
−
−
TYP.
5.0
67.5
57
−
0.8
0.7
0.15
0.3
MAX.
5.25
81
−
650
−
2
0.8
0.5
UNIT
V
mA
dBµV
MHz
V
deg
dB
dB
ORDERING INFORMATION
TYPE
NUMBER
TDA8042M
NAME
SSOP20
PACKAGE
DESCRIPTION
plastic shrink small outline package; 20 leads; body width 4.4 mm
VERSION
SOT266-1
1997 Apr 11
2