參數(shù)資料
型號： TB1254N
廠商： Toshiba Corporation
英文描述： PAL / NTSC / SECAM 1CHIP (IF+VCD PROCESSOR) IC
中文描述： PAL / NTSC制式/ SECAM制式1CHIP（中頻光碟處理器）芯片
文件頁數(shù)： 31/58頁
文件大?。?/td> 551K
代理商： TB1254N
Ver3.7
00/01/28
31
TEST CONDITION
PIF STAGE
Note
P1
Items/Symbols
PIF Input Sensitivity
/ vin min(p)
PIF maximum input
signal
/ vin max(p)
PIF gain control range
/ RAGC(p)
Bus conditions
RF AGC:except 0
PIF Freq. :
38.9MHz
VCO Adj. Center
:
0/1
Others : Preset
Measurement methods
(1) nput a signal that 38.9[MHz], 90[dB V], and 30 [%] modulated
by 15 [kHz] sine wave at pin 6.
(2) Set the bit of “VCO Adj. Req.” to “1”, and set the bit of “VCO Adj.
Req.” to “0”.
(3) Measure the amplitude at Pin 54(vo#54 [Vp-p]).
(4) Decreasing the IF input level, measure the input level at which
the output amplitude at pin 54 turns to be –3dB against “vo#54”
(vin min(p)[dB V]).
(5) ncreasing the IF input level, measure the input level at which
the output amplitude at pin 54 turns to be -1dB against “vo#54”
(vin min(p)[dB V]).
(6) RAGC(p)[dB] = vin max(p) - vin min(p)
P2
RF AGC output
voltage
/ VAGC max
/ VAGC min
RF
AGC
:
Adjust
PIF Freq. :
38.9MHz
VCO Adj. Req.:
0/1
Others : Preset
(1) nput a 38.9[MHz], 90[dB V] signal at pin 6.
(2) Set the bit of “VCO Adj. Req.” to “1”, and set the bit of “VCO Adj.
Req.” to “0”.
(3) Adjust RF AGC so that the pin 9 voltage is 4.5V.
(4) ncrease the IF input level to 107dBuV.
(5) Measure the pin 9 voltage (VAGC min[V]).
(6) Connect pin 6 and pin 7 to GND.
(7) Measure the pin 9 voltage (VAGC max[V]).
(1) nput a 38.9[MHz], 90[dB V] signal at pin 6.
(2) Set the bit of “VCO Adj. Req.” to “1”, and set the bit of “VCO Adj.
Req.” to “0”.
(3) Set the data of “RF AGC” to 01(h).
(4) Decrease the IF input level, measure the input level at which the
voltage at pin 9 turn to be 4.5[V] (v Dly min[dB V]).
(5) Set the data of “RF AGC” to 3F(h).
(6) ncrease the IF input level, measure the input level at which the
voltage at pin 9 turn to be 4.5[V] (v Dly max[dB V]).
(1) Remove all connection from pin 6 and pin 7.
(2) Measure the resistance (Zin R(p)[k ]) and capacitance (Zin
C(p)[pF]) of pin 6 and pin 7 by the impedance meter.
P3
RF delay point
/ v Dly min
/ v Dly max
RF
AGC
:
Adjust
PIF Freq.
38.9MHz
VCO Adj. Req. :
0/1
RF AGC: 01/3F
Others : Preset
P4
PIF input resistance
/ Zin R(p)
PIF input capacitance
/ Zin C(p)
Differential Gain
/ DG
Preset
P5
Differential Phase
/ DP
RF AGC:except 0
PIF Freq.:
38.9MHz
VCO Adj. Req.:
0/1
Vi Pol:0/1
Others : Preset
RF AGC:except 0
PIF Freq. :
38.9MHz
VCO Adj. Req.:
0/1
Others : Preset
(1) nput a signal that 38.9[MHz], 90[dB V], and 87.5 [%] modulated
by 10 stair video signal at pin 6.
(2) Set the bit of “VCO Adj. Req.” to “1”, and set the bit of “VCO Adj.
Req.” to “0”.
(3) Measure "DG[%]" and "DP[deg]" for Pin54 output.
P6
Intermodulation
/ IM
(1) nput a signal composed of following 3 signals at pin 6;
38.90[MHz]/90[dB V],
34.47[MHz]/80dB V]
33.40[MHz]/80[dB V]
(2) Set the bit of “VCO Adj. Req.” to “1”, and set the bit of “VCO Adj.
Req.” to “0”.
(3) Adjust pin 10 voltage so that the bottom of pin 54 output is equal
to sync. tip level.
(4) Measure the 1.07[MHz] level against the 4.43[MHz] level(=0[dB])
(IM[dB]).
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