Philips Semiconductors
Product specification
Quadrature demodulator
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
TDA8042M
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
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
V
CC
= 5.0 V
PARAMETER
CONDITIONS
MIN.
4.75
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
PACKAGE
NAME
SSOP20
DESCRIPTION
plastic shrink small outline package; 20 leads; body width 4.4 mm
VERSION
SOT266-1
1997 Apr 11
2
Philips Semiconductors
Product specification
Quadrature demodulator
PINNING
SYMBOL
IDET
GND1
VAGC
IOUT
GND2
IFA
IFB
V
CC2
QOUT
GND1
V
CC1
FDIV(B)
FDIV(A)
GND1
OSCB
OSCA
OSCDIS
V
CC1
GND1
VTH
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
ground
gain control input voltage
I channel amplifier output
ground
IF input A
IF input B
supply voltage 2
Q channel amplifier output
ground
supply voltage 1
prescaler output B
prescaler output A
ground
oscillator tank circuit B
oscillator tank circuit A
oscillator disable input
supply voltage 1
ground
AGC threshold voltage input
MBH967
TDA8042M
DESCRIPTION
AGC detector output signal
handbook, halfpage
IDET 1
GND1 2
VAGC 3
IOUT 4
GND2 5
20 VTH
19 GND1
18 VCC1
17 OSCDIS
16 OSCA
TDA8042M
IFA 6
IFB 7
VCC2 8
QOUT 9
GND1 10
15 OSCB
14 GND1
13 FDIV(A)
12 FDIV(B)
11 VCC1
Fig.2 Pin configuration.
1997 Apr 11
4
Philips Semiconductors
Product specification
Quadrature demodulator
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOL
V
CC
V
i
P
tot
T
stg
T
j
T
amb
Note
supply voltage
input voltage on all pins
total power dissipation
IC storage temperature
junction temperature
operating ambient temperature
PARAMETER
MIN.
−0.3
−0.3
−
−55
−
0
TDA8042M
MAX.
+6.0
V
CC
470
+150
+150
+70
(1)
V
V
UNIT
mW
°C
°C
°C
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
All pins withstand the ESD test in accordance with
“UZW-BO/FQ-A302 (human body model)”
and with
“UZW-BO/FQ-B302 (machine model)”.
These numbers can be found in the
“Quality reference Handbook”.
The handbook
can be ordered using the code 9397 750 00192.
THERMAL CHARACTERISTICS
SYMBOL
R
th j-a
PARAMETER
thermal resistance from junction to ambient in free air
VALUE
120
UNIT
K/W
1997 Apr 11
5
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