TA1290 データシートの表示（PDF） - Toshiba

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TA1290

TOSHIBA BIPOLAR LINEAR INTEGRATED CIRCUIT SILICON MONOLITHIC

Toshiba 

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

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