TA8805F(2001) Ver la hoja de datos (PDF) - Toshiba
Número de pieza
componentes Descripción
Fabricante
TA8805F Datasheet PDF : 17 Pages
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TA8805F,TA1207F
Note 7:
Note 8:
Note 9:
Note 10:
Note 11:
Signal-noise ratio
(1) PIF input : fo = 58.75 MHz, fm = 15.75 kHz, 30%AM, 84 dBµV
Measure IF AGC voltage and supply that voltage from external source.
(2) Measure output video signal voltage. : V1
(3) PIF input : fo = 58.75 MHz, 84 dBµV, CW
Measure output video signal voltage. : V2
Signal-noise ratio is calculated by following equality.
Signal-noise ratio = 20 log (V1 × 6 / V2) [dB]
Intermodulation
(1) PIF input : fo = 58.75 MHz, 84 dBµV, CW
Supply DC voltage to IF AGC from external source to fix IF AGC voltage.
(2) PIF input : following composite signals
fo = 58.75 MHz, 84 dBµV, CW
fc = 55.17 MHz, 74 dBµV, CW
Input
fs = 54.25 MHz, 74 dBµV, CW
Measure the difference of signal level at pin 24 920 kHz component and 3.58 MHz component
(Chroma sub-carrier).
Suppression of picture career
(1) PIF input : fo = 58.75 MHz, fm = 15.75 kHz, 78%AM, 84 dBµV
Measure IF AGC voltage and supply that voltage from external source.
(2) Measure output video signal voltage. : V1
(3) PIF input : fo = 58.75 MHz, 84 dBµV, CW
Measure signal level of 58.75 MHz component at pin 24. : V2
Signal-noise ratio is calculated by following equality.
Suppression of picture career = 20 × log (V1 / V2) [dB]
Output voltage at no signal
PIF input : no input IF AGC : GND
Measure output video signal DC voltage.
Black noise inverter level / Black noise clamp level
PIF input : fo = 58.75 MHz, fm = 15.75 kHz, 78%AM, 84 dBµV
Supply 0 V to IF AGC from external source. Raise that voltage gradually, measure black noise
inverter level.
2001-02-26 10/17
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