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參數(shù)資料
| 型號： | TDA9812T |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 接收器 |
| 英文描述： | Multistandard VIF-PLL and FM-PLL/AM demodulator |
| 中文描述： | AUDIO/VIDEO DEMODULATOR, PDSO28 |
| 封裝： | PLASTIC, SO-32 |
| 文件頁數(shù)： | 17/32頁 |
| 文件大小： | 272K |
| 代理商： | TDA9812T |
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1995 Mar 21
17
Philips Semiconductors
Preliminary specification
Multistandard VIF-PLL and
FM-PLL/AM demodulator
TDA9812
Notes
1.
2.
Values of video and sound parameters are decreased at V
P
= 4.5 V.
This parameter is not tested during production and is only given as application information for designing the television
receiver.
Loop bandwidth BL = 60 kHz (natural frequency f
n
= 15 kHz; damping factor d = 2; calculated with sync level within
gain control range). Resonance circuit of VCO: Q
0
> 50; C
ext
= 8.2 pF
±
0.25 pF; C
int
≈
8.5 pF (loop voltage
approximately 2.7 V).
Temperature coefficient of external LC-circuit is equal to zero.
V
i IF
= 10 mV RMS;
f = 1 MHz (VCO frequency offset related to picture carrier frequency); white picture video
modulation.
V
i IF
signal for nominal video signal.
Offset current measured between pin 7 and half of supply voltage (V
P
= 2.5 V) under the following conditions: no
input signal at VIF input (pins 1 and 2) and VIF amplifier gain at minimum (V
28
= V
P
). Due to sample-and-hold mode
of the FPLL in L standard, the leakage current of the loop filter capacitor (C = 220 nF) should not exceed 500 nA.
Measurements taken with SAW filter G1962 (sound shelf: 20 dB); loop bandwidth BL = 60 kHz.
a) Modulation VSB; sound carrier OFF; f
video
> 0.5 MHz.
b) Sound carrier ON; SIF SAW filter L9453; f
video
= 10 kHz to 10 MHz.
The 7 dB buffer gain accounts for 1 dB loss in the sound trap. Buffer output signal is typical 2 V (p-p), in event of
CVBS video amplifier output typical 1 V (p-p). If no sound trap is applied a 330
resistor must be connected from
output to input (from pin 21 to pin 22).
10. The leakage current of the AGC capacitor should not exceed 1
μ
A at B/G standard respectively 10 nA current at
L standard. Larger currents will increase the tilt.
11. S/N is the ratio of black-to-white amplitude to the black level noise voltage (RMS value, pin 10). B = 5 MHz weighted
in accordance with “CCIR 567”
3.
4.
5.
6.
7.
8.
9.
Standard switch (pin 9);
see also Table 2
V
9
DC potential voltage for
preferred settings
input voltage for negative
standard
input voltage for negative
standard
input voltage for positive
standard
LOW level input current
B/G standard; note 25
2.8
V
P
V
negative AGC OFF
1.3
2.3
V
L standard
0
0.8
V
I
IL
V
9
= 0 V
190
250
310
μ
A
L/L accent switch (pin 11)
V
11
DC potential voltage for
L standard VCO frequency
switching
L standard
L/L accent standard and
alignment
LOW level input current
note 25
2.8
V
P
2.0
V
V
I
IL
V
11
= 0 V
150
200
250
μ
A
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
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