TA1272 데이터 시트보기 (PDF) - Toshiba

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TA1272

TOSHIBA BIPOLAR LINEAR INTEGRATED CIRCUIT SILICON MONOLITHIC

Toshiba 

TA1272AF

TEST CONDITION

<PIF circuit>

Note 1: Output signal voltage

PIF input : fo = 58.75 MHz, 87.5%AM, 84 dBµV, White 100%

Measure output video signal voltage.

Note 2: PIF input signal voltage sensitivity

PIF input : fo = 58.75 MHz, fm = 15.75 kHz, 30%AM, 84 dBµV

Measure output video signal voltage (that voltage is 0 dB) Lower input signal voltage gradually,

measure input PIF signal voltage when output video signal voltage is −3 dB.

Note 3: Maximum input signal voltage

PIF input : fo = 58.75 MHz, fm = 15.75 kHz, 30%AM, 84 dBµV

Measure output video signal voltage (that voltage is 0 dB) Raise input signal voltage gradually,

measure input PIF signal voltage when output video signal voltage is +3 dB

Note 4: −3 dB video band width

(1) PIF input :

fo = 58.75 MHz, 84 dBµV, CW

Measure IF AGC voltage and supply that voltage from external source.

(2) Input following composite signals to the PIF input :

SG : 1

58.75 MHz, 84 dBµV (frequency : fixed)

SG : 2

58.65~45 MHz, 64 dBµV (frequency : variable)

Monitor spectrum of output signal at pin 24. Change frequency of SG : 2, measure frequency of

SG : 2, when video output signal is −3 dB.

Difference between that frequency and 58.75 MHz is −3 dB band width.

Note 5: Dependence of output signal voltage on power supply voltage

PIF input : fo = 58.75 MHz, 87.5%AM, 84 dBµV, standard TV signal (V / S = 10 : 4 Ramp)

Measure the output video signal voltage when power supply voltage are 3.5 V and 5.5 V. (4.5 ± 1.0 V)

Compare those voltage and the output video signal voltage when power supply voltage is 4.5 V.

Note 6: Deferential gain / Deferential phase

PIF input : fo = 58.75 MHz, 87.5%AM, 84 dBµV, standard TV signal (V / S = 10 : 4 Ramp) IF AGC :

free

Measure deferential gain and deferential phase.

Note 7: 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.

Note 8:

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).

Note 9: 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]

2001-02-28 10/17

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