1997 May 26

7

Philips Semiconductors

Product specification

Low power PLL FM demodulator for

satellite TV receivers

TDA8012AM

Notes

2. The VCO frequency drift is defined as the change in oscillator frequency for a variation of ambient temperature, on

measured in the application of Fig.4 with the following component values for the tank circuit:

Coil: 2.5 turns; diameter 2 mm; adjustable.

Capacitor: miniature ceramic plate capacitor NP0, 3.3 pF.

3. The circuit is designed for an input level of 57 dB

µV. The maximum allowable input level for the PLL design is

61 dB

µV. However, for levels different from 57 dBµV, the optimum loop filter values will be different from those given

for the 57 dB

µV input level in the reference measuring set-up.

4. The input impedance is reduced to a resistor with a parallel reactance. The values are given at 480 MHz. In order to

reduce the radiation from the oscillator to the RF input, it is recommended to use a symmetrical drive.

5. The PLL loop gain shift and drift are given without loop filter shift and drift (non-temperature compensated external

components).

Automatic gain control (note 12)

automatic gain control threshold as a

function of the voltage applied to pin 10

−−

53

dB

µV

61

−−

dB

µV

note 13

connected

−

57

−

dB

µV

LD

level detector

shift

−

1

−

dB

drift

−

1

−

dB

automatic gain control steepness

−

8

−

mA/dB

low level automatic gain control output

saturation voltage

−

200

500

mV

Keying pulse

input keyed pulse time period

−

64

−µs

keyed pulse width

8

−−µs

LOW level input keyed pulse voltage

key on

−−

0.8

V

HIGH level input keyed pulse voltage

key off

3.0

−−

V

input impedance

1

10

−

k

Ω

AFC and carrier detector output (note 15)

peak detector leakage current

note 16

50

150

250

nA

automatic frequency control steepness

with unmodulated input signal

4.5

5.5

6.5

V/MHz

∆f

AFC(shift)

shift of automatic frequency control

unmodulated 480 MHz input signal

−±180

±500

kHz

drift of automatic frequency control

−−1.1

−

MHz

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

∆V

AFC

∆f

-----------------