TA1272 데이터 시트보기 (PDF) - Toshiba

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TA1272

TOSHIBA BIPOLAR LINEAR INTEGRATED CIRCUIT SILICON MONOLITHIC

Toshiba 

TA1272AF

Note 10:

Note 11:

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 0V to IF AGC from external source. Raise that voltage gradually, measure black noise

inverter level.

<SIF circuit>

Note 12: Output signal voltage

SIF input : fo = 4.5 MHz, fm = 400 Hz, 25 kHz / devi, 84 dBµV

Measure output audio signal voltage.

Note 13: SIF input signal voltage sensitivity

SIF input : fo = 4.5 MHz, fm = 400 Hz, 25 kHz / devi, 84 dBµV

Measure output audio signal voltage (that voltage is 0 dB). Lower input SIF signal voltage gradually,

measure input SIF signal voltage when output audio signal voltage is −3 dB.

Note 14: Total harmonic distortion

SIF input : fo = 4.5 MHz, fm = 400 Hz, 7.5 kHz / devi, 84 dBµV

Note 15: AM Rejection

SIF input :

(1) FM : fo = 4.5 MHz, fm = 400 Hz, 25 kHz / devi, 84 dBµV

(2) AM : fo = 4.5 MHz, fm = 400 Hz, 30%AM, 84 dBµV

Measure difference of output audio signal voltage between (1) and (2).

Note 16: Signal-noise ratio

SIF input : fo = 4.5 MHz, fm = 400 Hz, 25 kHz / devi, 84 dBµV

Measure audio signal output voltage. : V1 [mVrms]

SIF input : fo = 4.5 MHz, fm = 400 Hz, 25 kHz / devi, 84 dBµV

Measure audio signal output voltage. : V2 [mVrms]

Signal-noise ratio is calculated by following equality.

Signal-noise ratio = 20 ℓog (V1 / V2) [dB]

Note 17: −3 dB bandwidth

SIF input : fo = 4.5 MHz, fm = 400 Hz, 25 kHz / devi, 84 dBµV

Measure audio signal output voltage. (that voltage is 0 dB) Then change input signal frequency,

measure bandwidth that audio signal output voltage within −3 dB.

Note 18: Dependence of output signal voltage on power supply voltage

SIF input : fo = 4.5 MHz, fm = 400 Hz, 25 kHz / devi, 84 dBµV

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

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

2001-02-28 11/17

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