TDA9885 Philips Semiconductors, TDA9885 Datasheet - Page 35

• Manufacturer Part Number: TDA9885
• Description: I2C-bus controlled single and multistandard alignment-free IF-PLL demodulators
• Manufacturer: Philips Semiconductors

Philips Semiconductors
9. Measurements taken with SAW filter M1963M (sound shelf: 20 dB); loop bandwidth BL = 70 kHz.
10. AC load; C
11. The sound carrier trap can be bypassed by switching the I
12. If selected by the I
13. The response time is valid for a VIF input level range from 200 V to 70 mV.
14. To match the AFC output signal to different tuning systems a current source output is provided. The test circuit is
15. The tolerance of the reference frequency determines the accuracy of the VIF-AFC, FM demodulator centre
16. The intercarrier output signal at pin SIOMAD can be calculated by the following formula taking into account the
17. For normal operation (with the I
18. SIF input level is 10 mV (RMS); VIF input level is 10 mV (RMS) unmodulated.
19. Measured with an FM deviation of 25 kHz and the typical AF output voltage of 500 mV (RMS). The AF output signal
20. The lower limit of the audio bandwidth depends on the value of the capacitor at pin AFD. A value of C
21. For all S/N measurements the VIF modulator in use has to meet the following specifications:
2003 Oct 02
I
alignment-free IF-PLL demodulators
2
a) Modulation Vestigial Side-Band (VSB); sound carrier off; f
b) Sound carrier on; f
the integrated sound carrier traps (see Figs 13 to 18; H (s) is the absolute value of transfer function).
appears at pin CVBS. The amplitude is 1.1 V (p-p).
this case, both pins cannot be used for the normal port function.
given in Fig.10. The AFC slope (voltage per frequency) can be changed by resistors R1 and R2.
frequency and maximum FM deviation.
internal video signal with 1.1 V (p-p) as a reference:
and
where:
in dB, 6 dB is the correction term of internal circuitry and 3 dB is the tolerance of video output and intercarrier output
V
will be activated by the application of a 2.2 k resistor between pin SIOMAD and ground. If this MAD2 is activated,
also the power-on set-up state activates a VIF frequency of 58.75 MHz.
can be attenuated by 6 dB to 250 mV (RMS) via the I
the AF output signal has to be reduced in order to avoid clipping (THD < 1.5 %).
leads to f
a) Incidental phase modulation for black-to-white jump less than 0.5 degrees.
b) QSS AF performance, measured with the television demodulator AMF2 (audio output, weighted S/N ratio) better
c) Picture-to-sound carrier ratio PC/SC
---------- -
2 2
C-bus controlled single and multistandard
V
o(intc)(rms)
1
o(intc)(rms)
than 60 dB (at deviation 27 kHz) for 6 kHz sine wave black-to-white video modulation.
r
is the correction term for RMS value,
=
----- -
20
AF( 3dB)
1
.
L
=
< 20 pF and R
1.1
V
------------- - dB
V
i(SC)
i(PC)
2
20 Hz and C
C-bus, the VIF-AGC voltage can be monitored at pin OP2, and pin OP1 can be used as input. In
---------- -
2 2
1
video
+
10
= 10 kHz to 10 MHz.
L
6 dB 3 dB
> 1 k . The sound carrier frequencies (depending on TV standard) are attenuated by
r
V
2
AF
C-bus) no DC load at pin SIOMAD is allowed. The second module address (MAD2)
= 220 nF leads to f
1
= 13 dB (transmitter).
V
--------------- dB
V
i SC
i PC
2
C-bus. For handling a frequency deviation of more than 55 kHz,
AF( 3dB)
35
is the sound-to-picture carrier ratio at pins VIF1 and VIF2
2
C-bus. In this way the full composite video spectrum
video
40 Hz.
> 0.5 MHz.
TDA9885; TDA9886
Product specification
AF
= 470 nF