November 1987

8

Philips Semiconductors

Product specification

Television IF amplifier and demodulator

TDA8340

TDA8341

Notes

1. All input signals are measured r.m.s. at top sync and 38,9 MHz.

2. Measured with 0 dB = 200

µV.

3. Tuner AGC starting point is defined as ‘level of input signal when tuner AGC current = 1 mA’.

4. Measured with pin 3 connected via 39 k

signal and with pin 12 not loaded.

5. At the ‘projected zero point’, e.g. with switched demodulator.

6. Measured in the circuit of Fig.7:

the differential gain is expressed as a percentage of the difference in peak amplitudes between the largest and

smallest value relative to the subcarrier amplitude at blanking level;

the differential phase is defined as ‘the difference (in degrees) between the largest and smallest phase angles’.

7. Measured according to the test line shown in Fig.9:

the non-linearity is expressed as a percentage of the maximum deviation of a luminance step from the mean step,

with respect to the mean step;

the mean step is (white level

− black level) divided by the number of steps.

8. Measured up to 45 dB gain control.

9. Test set-up and input conditions for intermodulation measurements as in Figs 6 and 7.

10. Measured with a 75

Ω source:

11. Video output waveform showing white spot and noise inverter threshold levels.

SS

N

+

()

⁄

20log

V

out black to white

V

n rms

5 MHz

=

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

=

Fig.2 AFC output voltage as a function of frequency.