TA1290FN_01 Datasheet, PDF (8/13 Pages) Toshiba Semiconductor – PIF IC FOR TV

TA1290FN
Note 8:
Note 9:
Note 10:
Suppression of career
PIF input : fp = 58.75MHz, fm = 15.75kHz, 30%AM, 84dBµV
Add the 2nd AGC terminal from external power supply, so that the output video signal voltage
(15-b) can be 2Vp-p.
Turning modulation off, measure output career (Vcareer [Vp-p]) at pin 15. Calculate the following
equation.
(Suppression of career) = 20ℓog (2 / Vcareer) [dB]
Suppression of career harmonics
PIF input : fp = 58.75MHz, fm = 15.75kHz, 30%AM, 84dBµV
Add the 2nd AGC terminal from external power supply, so that the output video signal voltage
(15-b) can be 2Vp-p.
Turning modulation off, measure output career (117.5MHz) level (Vcareer [Vp-p]) at pin 15.
Calculate the following equation.
(Suppression of career harmonics) = 20 log (2 / Vcareer) [dB]
AFT control steepness
PIF input : fp = 58.75MHz, 84dBµV, CW
Input the above signal and adjust the AFT coil so that the AFT output voltage is 4.5V.
Measure AFT output voltage of following conditions.
(input frequency = 58.74MHz) : VAFT1
(input frequency = 58.76MHz) : VAFT2
AFT control steepness is calculated by following equality.
(AFT control steepness) = ∆f / ∆V = 20 / (VAFT1−VAFT2)
Note 11:
Intermodulation
Input following composite signals to the PIF input.
SG : 1
58.75MHz, 84dBµV (picture career)
SG : 2
54.25MHz, 74dBµV (sound career)
SG : 3
55.17MHz, 74dBµV (chroma)
Supply DC voltage to 2nd AGC terminal from external source, so that bottom of output signal
voltage (15-b) matches sync. tip level. Measure the difference of output signal voltage at pin 15
between 3.58MHz component (chroma) and 920kHz component.
2001-02-26 8/13