TDA935x Philips, TDA935x Datasheet - Page 95

• Manufacturer Part Number: TDA935x
• Description: TV Signal Processor-Teletext Decoder with Embedded u-Controller
• Manufacturer: Philips

Philips Semiconductors
14. Measured at an input signal of 10 mV
15. The time-constant of the IF-AGC is internal and the speed of the AGC can be set via the bits AGC1 and AGC0 in
16. The AFC control voltage is generated by the digital tuning system of the PLL demodulator. This system uses the
17. The weighted S/N ratio is measured under the following conditions:
18. Calculation of the FM-PLL filter can be done approximately by use of the following equations:
19. Modulation frequency: 1 kHz, f =
20. f = 4.5/5.5 MHz; FM: 70 Hz,
21. This figure is independent of the TV standard and valid for a frequency deviation of 25 kHz at a carrier frequency
2001 Jan 18
TV signal processor-Teletext decoder with
embedded -Controller
voltage (RMS value). B = 5 MHz. Weighted in accordance with CCIR 567.
subaddress 28H. The AGC response time is also dependent on the acquisition time of the PLL demodulator. The
values given are valid for the ‘norm’ setting (AGC1-AGC0 = 0-1) and when the PLL is in lock.
clock frequency of the -Controller/Teletext decoder as a reference and is therefore very accurate. For this reason
no maximum and minimum values are given for the window sensitivity figures (parameters M.7.2 and M.7.3). The
tuning information is supplied to the tuning system via the AFA and AFB bits in output byte 02H. The AFC value is
valid only when the LOCK-bit is 1.
a) The vision IF modulator must meet the following specifications:
b) The measurements must be carried out with the Siemens SAW filters G3962 for vision IF and G9350 for sound
c) The PC/SC ratio at the vision IF input is calculated as the addition of the TV transmitter ratio and the SAW filter
BL
These equations are only valid under the conditions that
Definitions:
K
K
R = loop filter resistor
C
C
f
BL
Some examples for these values are given in table 132
of 4.5 MHz or a deviation of 50 kHz at a carrier frequency of 5.5/6.0/6.5 MHz.
f o
0
0
D
S
P
= damping factor
= natural frequency of PLL
= VCO steepness in rad/V
=
= phase detector steepness A/rad
Incidental phase modulation for black-to-white jumps less than 0.5 degrees.
QSS AF performance, measured with the television-demodulator AMF2 (audio output, weighted S/N ratio) better
than 60 dB (deviation 27 kHz) for 6 kHz sine wave black-to-white modulation.
Picture-to-sound carrier ratio: PC/SC1 = 13 dB (transmitter).
IF. Input level for sound IF 10 mV
PC/SC ratio. This PC/SC ratio is necessary to achieve the S/N(W) values as indicated.
= series capacitor
= parallel capacitor
=
3dB
3dB
---------------------------------- -
2R K
------ -
2
1
= f
= loop bandwidth for 3dB
0
K
------------- -
(1.55
1
C
0
0
K
K
P
D
D
C
P
2
)
50 kHz deviation; AM: 1.0 kHz, 30% modulation.
50 kHz.
RMS
RMS
. The S/N is the ratio of black-to-white amplitude to the black level noise
with 27 kHz deviation.
95
1 and C
TDA935X/6X/8X PS/N2 series
S
5C
P
.
Tentative Device Specification