參數(shù)資料
型號(hào)： TDA936X
廠商： NXP Semiconductors N.V.
英文描述： TV signal processor-Teletext decoder with embedded m-Controller
中文描述： 電視信號(hào)處理器與嵌入式米圖文電視解碼器控制器
文件頁數(shù)： 121/140頁
文件大小： 570K
代理商： TDA936X
1999 Sep 28
121
Philips Semiconductors
Preliminary Device Specification
TV signal processor-Teletext decoder with
embedded
μ
-Controller
TDA935X/6X/8X series
11. This figure is valid for the complete video signal amplitude (peak white-to-black), see Fig.50.
12. The noise inverter is only active in the ‘strong signal mode’ (no noise detected in the incoming signal)
13. Measured at an input signal of 10 mV
RMS
. The S/N is the ratio of black-to-white amplitude to the black level noise
voltage (RMS value). B = 5 MHz. Weighted in accordance with CCIR 567.
14. 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
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.
15. The AFC control voltage is generated by the digital tuning system of the PLL demodulator. This system uses the
clock frequency of the
μ
-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.
16. The weighted S/N ratio is measured under the following conditions:
a) The vision IF modulator must meet the following specifications:
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).
b) The measurements must be carried out with the Siemens SAW filters G3962 for vision IF and G9350 for sound
IF. Input level for sound IF 10 mV
RMS
with 27 kHz deviation.
c) The PC/SC ratio at the vision IF input is calculated as the addition of the TV transmitter ratio and the SAW filter
PC/SC ratio. This PC/SC ratio is necessary to achieve the S/N(W) values as indicated.
17. Calculation of the FM-PLL filter can be done approximately by use of the following equations:
BL
3dB
= f
0
(1.55
υ
2
)
These equations are only valid under the conditions that
υ ≤
1 and C
S
>
5C
P
.
Definitions:
K
0
= VCO steepness in rad/V
K
D
= phase detector steepness
μ
A/rad
R = loop filter resistor
C
S
= series capacitor
C
P
= parallel capacitor
f
0
= natural frequency of PLL
BL
3dB
= loop bandwidth for
3dB
υ
= damping factor
Some examples for these values are given in table 121
18. Modulation frequency: 1 kHz,
f =
±
50 kHz.
19. f = 4.5/5.5 MHz; FM: 70 Hz,
±
50 kHz deviation; AM: 1.0 kHz, 30% modulation.
fo
2
π
--1
K
K
D
C
P
--------------
=
υ
2R K
0
K
D
C
P
----------------1
=
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