Philips tda8012m DATASHEETS
INTEGRATED CIRCUITS
DATA SH EET
TDA8012M
Low power PLL FM demodulator
for satellite TV receivers
Product specification
Supersedes data of 1995 Feb 02
File under Integrated Circuits, IC02
1996 Mar 26
Philips Semiconductors Product specification
Low power PLL FM demodulator
TDA8012M
for satellite TV receivers
FEATURES
• High input sensitivity
• Fully balanced two-pin Voltage Controlled Oscillator
(VCO)
• Low input impedance (50 Ω)
• Low impedance video baseband output
• Internal voltage stabilizer
• Keyed AFC or peak-to-peak AFC
• Carrier detector
• AGC output
• Suitable for High Definition TV (HDTV).
QUICK REFERENCE DATA
SYMBOL PARAMETER CONDITION MIN. TYP. MAX. UNIT
V
CC
I
CC
V
i
V
o(p-p)
f
i
supply voltage 4.5 5.0 5.5 V
supply current VCC=5V; T
input signal voltage level 53 57 61 dBµV
video output signal voltage
amplitude (peak-to-peak value)
operating input frequency − 480 − MHz
APPLICATIONS
• Direct Broadcast Satellite (DBS) receivers.
GENERAL DESCRIPTION
The TDA8012M is a sensitive PLL FM demodulator which
is used for the second IF in satellite receivers. It provides
Automatic Gain Control (AGC) and Automatic Frequency
Control (AFC) outputs that can be used to optimize the
level and frequency of the input signal. During the
searching procedure, the AFC output provides a signal
which is used for carrier detection.
=25°C506070mA
amb
∆fo= 25 MHz (p-p) − 1 − V
ORDERING INFORMATION
TYPE
NUMBER
TDA8012M SSOP20 plastic shrink small outline package; 20 leads; body width 4.4 mm SOT266-1
NAME DESCRIPTION VERSION
PACKAGES
1996 Mar 26 2
Philips Semiconductors Product specification
Low power PLL FM demodulator
for satellite TV receivers
BLOCK DIAGRAM
handbook, full pagewidth
IFI1
IFI2
GND
V
CC
1
2
3
4
5
6
7
STABILIZER
8
AGC
9
10
th
CDF1
CDF2
PD(pos)
PD(neg)
AGCO
AGC
CARRIER
DETECTOR
AFC
TDA8012M
VCO
VIDEO BUFFER
20
19
18
17
16
15
14
13
12
11
TDA8012M
AFC
os
AFC
CDO
KEY
NF
VCO2
VCO1
OSCGND
LF2
LF1
VIDEO
MBE251
1996 Mar 26 3
Fig.1 Block diagram.
Philips Semiconductors Product specification
Low power PLL FM demodulator
for satellite TV receivers
PINNING
SYMBOL PIN DESCRIPTION
CDF1 1 carrier detector filter 1 input
CDF2 2 carrier detector filter 2 input
PD(pos) 3 positive peak detector output
PD(neg) 4 negative peak detector output
IFI1 5 IF input 1
IFI2 6 IF input 2
GND 7 ground
V
CC
AGCO 9 AGC output
AGC
th
VIDEO 11 baseband signal output
LF1 12 loop filter 1 input
LF2 13 loop filter 2 input
OSCGND 14 oscillator ground
VCO1 15 oscillator tank circuit 1 input
VCO2 16 oscillator tank circuit 2 input
NF 17 noise filter input
KEY 18 key pulse input
AFC
CDO
AFC
os
8 supply voltage
10 AGC threshold voltage input
19 AFC and carrier detector output
20 AFC offset input
dbook, halfpage
CDF1
1
2
CDF2
PD(pos)
PD(neg)
IFI1
3
4
5
TDA8012M
6
IFI2
7
GND
V
8
CC
AGCO
AGC
9
10
th
Fig.2 Pin configuration.
MBE250
TDA8012M
AFC
20
19
18
17
16
15
14
13
12
11
os
AFC
CDO
KEY
NF
VCO2
VCO1
OSCGND
LF2
LF1
VIDEO
FUNCTIONAL DESCRIPTION
The TDA8012M is a low power PLL FM demodulator
designed for use in satellite TV reception systems.
The demodulator is based on a Phase-Locked Loop (PLL)
structure including a fully balanced two-pin VCO. A high
gain IF amplifier ensures a high input sensitivity. The video
output voltage is supplied via a highly linear video buffer
which has a low output impedance. The centre frequency
of the VCO and the loop characteristics can be set using
external components.
The circuit provides an AGC signal which is used to drive
a gain-controlled IF amplifier (TDA8011T or TDA8010M)
to ensure a stable PLL demodulation characteristic.
An analog AFC voltage is also made available. This signal
can be suitably applied to the input of the ADC port of the
PLL frequency synthesizer (TSA5055). The AFC function
may be keyed to address D2MAC and MUSE systems.
The TDA8012M includes a Carrier Detector (CD) which is
used for channel detection during search procedures.
1996 Mar 26 4
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