Philips TDA8042M Datasheet
INTEGRATED CIRCUITS
DATA SH EET
TDA8042M
Quadrature demodulator
Product specification
File under Integrated Circuits, IC02
1997 Apr 11
Philips Semiconductors Product specification
Quadrature demodulator 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 PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
V
CC
I
CC
V
i(RF)
f
i(RF)
V
olQ(p-p)
∆E
∆E
∆G
Φ(I-Q)
G(I-Q)
tilt
supply voltage 4.75 5.0 5.25 V
supply current VCC= 5.0 V 54 67.5 81 mA
operating input level − 57 − dBµV
RF input signal frequency 350 − 650 MHz
I and Q output voltage (peak-to-peak value) − 0.8 − V
phase matching error between I and Q channels − 0.7 2 deg
gain matching error between I and Q channels − 0.15 0.8 dB
gain tilt error between I and Q channels − 0.3 0.5 dB
ORDERING INFORMATION
TYPE
NUMBER
NAME DESCRIPTION VERSION
PACKAGE
TDA8042M SSOP20 plastic shrink small outline package; 20 leads; body width 4.4 mm SOT266-1
1997 Apr 11 2
Philips Semiconductors Product specification
Quadrature demodulator TDA8042M
BLOCK DIAGRAM
handbook, full pagewidth
IDET
1
DET
20
VTH
IFA
IFB
2
3
4
5
6
7
8
×
0°
90°
×
9
10
I
× 2
Q
VOLTAGE
REFERENCE
VCO
32
GND1
VAGC
IOUT
GND2
V
CC2
QOUT FDIV(B)
GND1
19
GND1
18
V
CC1
17
OSCDIS
16
OSCA
15
OSCB
14
GND1
13
FDIV(A)
12
11
V
CC1
TDA8042M
MBH968
Fig.1 Block diagram.
1997 Apr 11 3
Philips Semiconductors Product specification
Quadrature demodulator TDA8042M
PINNING
SYMBOL PIN DESCRIPTION
IDET 1 AGC detector output signal
GND1 2 ground
VAGC 3 gain control input voltage
IOUT 4 I channel amplifier output
GND2 5 ground
IFA 6 IF input A
IFB 7 IF input B
V
CC2
8 supply voltage 2
QOUT 9 Q channel amplifier output
GND1 10 ground
V
CC1
11 supply voltage 1
FDIV(B) 12 prescaler output B
FDIV(A) 13 prescaler output A
GND1 14 ground
OSCB 15 oscillator tank circuit B
OSCA 16 oscillator tank circuit A
OSCDIS 17 oscillator disable input
V
CC1
18 supply voltage 1
GND1 19 ground
VTH 20 AGC threshold voltage input
handbook, halfpage
IDET VTH
1
GND1 GND1
2
3
VAGC V
IOUT OSCDIS
4
5
GND2 OSCA
IFA OSCB
IFB GND1
V
CC2
QOUT FDIV(B)
GND1 V
TDA8042M
6
7
8
9
10
MBH967
20
19
18
17
16
15
14
13
12
11
CC1
FDIV(A)
CC1
Fig.2 Pin configuration.
1997 Apr 11 4
Philips Semiconductors Product specification
Quadrature demodulator TDA8042M
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOL PARAMETER MIN. MAX. UNIT
V
CC
V
i
P
tot
T
stg
T
j
T
amb
Note
1. The operating ambient temperature can be extended up to +85 °C providing the supply voltage remains lower or
equal to 5.2 V in order to maintain the junction temperature below 150 °C.
QUALITY SPECIFICATION
supply voltage −0.3 +6.0 V
input voltage on all pins −0.3 V
CC
V
total power dissipation − 470 mW
IC storage temperature −55 +150 °C
junction temperature − +150 °C
operating ambient temperature 0 +70
(1)
°C
All pins withstand the ESD test in accordance with
“UZW-BO/FQ-B302 (machine model)”
. These numbers can be found in the
“UZW-BO/FQ-A302 (human body model)”
“Quality reference Handbook”
and with
. The handbook
can be ordered using the code 9397 750 00192.
THERMAL CHARACTERISTICS
SYMBOL PARAMETER VALUE UNIT
R
th j-a
thermal resistance from junction to ambient in free air 120 K/W
1997 Apr 11 5
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