參數(shù)資料
型號: TDA9808T-T
廠商: NXP SEMICONDUCTORS
元件分類: 接收器
英文描述: AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO20
文件頁數(shù): 28/35頁
文件大?。?/td> 170K
代理商: TDA9808T-T
TA1317AN
2002-09-06
35
Test Condition
SW Mode
Note
No.
Parameter
SW5
SW6
SW7
SW8
SW10
SW11
SW17
SW24
Test Method
(unless otherwise specified, VCC = 9 V, Ta = 25 ± 3°C, data = preset values)
15
EHT input dynamic range
OFF
B
ON
OFF
B
ON
A
(1) Input vertical trigger pulse to pin VIN.
Pulse level (VT)
= 3.0 V
(2) Set VD (sub-address: 00) to AC-Coupling mode (data: 81).
(3) Set V SHIFT (sub-address: 01) data to 82.
(4) Connect external power supply V3 to pin 3 (EHT IN).
(5) Set V-EHT COMPENSATION (sub-address: 02) to maximum (data: 87).
(6) Change external power supply V3 from 1 to 7 V and monitor Pin 6 (V NF)
amplitude.
(7) When Pin 6 (V NF) amplitude changes, measure V3 voltages VEHL and VEHH.
16
Horizontal amplitude
adjustment (picture width)
change amount
OFF
B
ON
OFF
B
ON
A
(1) Input vertical trigger pulse to pin VIN.
Pulse level (VT)
= 3.0 V
(2) Set EW PARABOLA (sub-address: 0A) to minimum (data: 00).
(3) Set PICTURE WIDTH to maximum ( (sub-address: 01, data: FC) and (sub-address:
0C, data: 81) ) and measure Pin 10 (EW FD) voltage VEV (FC).
(4) Set PICTURE WIDTH to minimum ( (sub-address: 01, data: 00) and (sub-address:
0C, data: 80) ) and measure Pin 10 (EW FD) voltage VEV (00).
(5) Calculate change amount VEV using the following formula.
VEV = VEV (FC) VEV (00)
Voltage applied to pin 3 (EHT IN) (V3)
P
in
6
(V
NF)
a
m
pl
it
ude
VEHL
VEHH
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