Philips TDA8012AM-C1 Datasheet

DATA SH EET

Product specification
File under Integrated Circuits, IC02

1997 May 26

INTEGRATED CIRCUITS

TDA8012AM

Low power PLL FM demodulator for
satellite TV receivers

1997 May 26 2

Philips Semiconductors Product specification

Low power PLL FM demodulator for
satellite TV receivers

TDA8012AM

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 Automatic Frequency Control (AFC) or peak AFC

• Carrier detector

• Automatic Gain Control (AGC) output.

APPLICATIONS

• Digital Broadcast System (DBS) satellite receivers.

GENERAL DESCRIPTION

The TDA8012AM is a sensitive Phase Locked Loop (PLL)
Frequency Modulation (FM) demodulator for the second
Intermediate Frequency (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 the frequency of the signal applied
at the input. During the search procedure, the AFC output
provides a signal used for carrier detection.

QUICK REFERENCE DATA

ORDERING INFORMATION

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

V

CC

supply voltage 4.75 5.0 5.25 V

I

CC

supply current VCC=5V; T

amb

=25°C 405060mA

V

i

input level 53 57 61 dBµV

f

c

operating carrier frequency − 480 − MHz

V

o(p-p)

video output signal amplitude
(peak-to-peak value)

frequency deviation = 25 MHz − 1 − V

TYPE

NUMBER

PACKAGE

NAME DESCRIPTION VERSION

TDA8012AM SSOP20 plastic shrink small outline package; 20 leads; body width 4.4 mm SOT266-1

1997 May 26 3

Philips Semiconductors Product specification

Low power PLL FM demodulator for
satellite TV receivers

TDA8012AM

BLOCK DIAGRAM

Fig.1 Block diagram.

handbook, full pagewidth

MBH934

3

4

STABILIZER

VCO

VIDEO BUFFER

TDA8012AM

1

2

5

6

7
8

9

10

CDF1
CDF2

PD

+

PD

−

IFI1
IFI2

GND

CC

V

AGCO

V

th(AGC)

VIDEO

LF1

LF2

OSCGND

VCO1

VCO2

AFCF

KEY

AFC/CDO

AFCOS

20

19
18

17

16

15
14

13

12

11

CARRIER

DETECTOR

AFC

AGC

1997 May 26 4

Philips Semiconductors Product specification

Low power PLL FM demodulator for
satellite TV receivers

TDA8012AM

PINNING

SYMBOL PIN DESCRIPTION

CDF1 1 carrier detector filter 1 input
CDF2 2 carrier detector filter 2 input
PD+ 3 positive peak detector output
PD− 4 negative peak detector output
IFI1 5 intermediate frequency input 1
IFI2 6 intermediate frequency input 2
GND 7 general ground
V

CC

8 supply voltage
AGCO 9 automatic gain control output
V

th(AGC)

10 automatic gain control threshold

voltage input
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
AFCF 17 automatic frequency control filter

input
KEY 18 key pulse input
AFC/CDO 19 automatic frequency control

/carrier detector output
AFCOS 20 automatic frequency control of fset

input

Fig.2 Pin configuration.

handbook, halfpage

TDA8012AM

MBH931

1
2
3
4
5
6
7
8
9

10

20
19
18
17
16
15
14
13
12
11

CDF1

CDF2

IFI1
IFI2

GND

AGCO

V

CC

V

th(AGC)

PD

+

PD

−

AFCOS

VIDEO

LF1

LF2

OSCGND

VCO1

VCO2

AFCF

KEY

AFC/CDO

FUNCTIONAL DESCRIPTION

The TDA8012AM is a low power PLL FM demodulator
designed for use in satellite TV reception systems.

The demodulator is based on a 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 through a highly-linear video buffer with a low
output impedance. The centre frequency of the VCO and
the loop characteristics can be set by external components
(see Fig.4).

The circuit provides an AGC signal which is used to drive
a gain-controlled IF amplifier (TDA8011T or TDA8010AM)
for a stable PLL demodulation characteristic.

An analog AFC voltage is available. This signal fits in with
the input of the A/D converter port of the PLL frequency
synthesizer (TSA5055). The AFC function may be keyed
to address D2MAC systems.

The TDA8012AM includes a Carrier Detector (CD) used
for channel detection during search procedures.

1997 May 26 5

Philips Semiconductors Product specification

Low power PLL FM demodulator for
satellite TV receivers

TDA8012AM

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 134).

HANDLING

Inputs and outputs are protected against electrostatic discharge in normal handling. However, to be totally safe it is
desirable to take normal precautions appropriate to handling MOS devices.

THERMAL CHARACTERISTICS

SYMBOL PARAMETER MIN. MAX. UNIT

V

CC

supply voltage −0.3 +6.0 V

V

I(max)

voltage on all pins −0.3 V

CC

V

I

O(max)

output source current − 10 mA

t

sc(max)

maximum short-circuit time on outputs − 10 s

Z

L

AC load impedance at video output 600 −Ω

T

stg

IC storage temperature −55 +150 °C

T

j

junction temperature − 150 °C

T

amb

operating ambient temperature −10 +80 °C

SYMBOL PARAMETER CONDITIONS VALUE UNIT

R

th j-a

thermal resistance from junction to ambient in free air 120 K/W