TA1275BFNG Datasheet, PDF (15/21 Pages) Toshiba Semiconductor – SECAM Demodulator Processor

TA1275BFNG
Test Conditions (Unless otherwise specified, V_CC = 5 V (Pins 2 & 15), Ta = 25°C)
Note
Item
Test Condition
(1) : Input a 20 mV_p-p sine wave whose frequency is sweep
into Pin 20.
(2) : Connect Pin 20 to GND through 27 kΩ.
1 Bell / Filter f₀
(3) : Keep Pin 24 GND.
(4) : Measure the frequency at which the Pin 7 output is the
greatest, that is, "f_0BEL".
(5) : Calculate : "f_0B-C" = f_0BEL−4,286 kHz.
(1) : Input a 20 mV_p-p sine wave whose frequency is sweep into Pin
20.
(2) : Connect pin 20 to GND through 27 kΩ.
2 Bell / Filter f₀ Variable Range _{(3) : Measure the frequency at which the Pin 7 output is the greatest}
when V_CC is 5.5 V / 4.5 V, that is, f_0BEL5.5 / f_0BEL4.5.
(4) : Calculate : "f_0B-H" = f_0BELH−4,286 kHz.
"f_0B-L" = f_0BELL−4,286 kHz.
(1) : Input a 20 mV_p-p sine wave whose frequency is sweep into Pin
20.
3 Bell / Filter Q
(2) : Connect Pin 20 to GND through 27 kΩ.
(3) : Pin 24 is GND.
(4) : Observe the frequency response of the Pin 7 output.
(5) : Calculate : "Q_BEL" = (MAX−3dB Band Width) / f_0BEL.
4
Color Difference Output
Amplitude
(1) : Input a 75% color bar (200 mV_p-p at R ID) into Pin 20.
(2) : Measure the R-Y output amplitude at Pin 9, that is, "V_RS".
(3) : Measure the B-Y output amplitude at Pin 11, that is, "V_BS".
5
Color Difference Relative
Amplitude
Calculate : "R / B-S" = V_RS / V_BS.
6 Linearity
7 Rising Time
(1) : Input a 75% color bar (200 mV_p-p at R ID) into Pin 20.
(2) : Measure the amplitude between Black and Cyan / Red,
that is, V_Cyan / V_Red.
(3) : Measure the amplitude between Black and Yellow /
Blue, that is, V_Yellow / V_Blue.
(4) : Calculate : "LinR" = V_Cyan / V_Red
"LinB" = V_Yellow / V_Blue
(1) : Input a 75% color bar (200 mV_p-p at R ID)
into Pin 20.
(2) : Measure the rising time (from 10% to 90%)
between Green and Magenta at Pin 9 / Pin 11, that is,
"t_rR" / "t_rB".
8 Demodulation Hold Range (1) : Input a 200 mV_p-p, 2 MHz sine wave into Pin 20.
(2) : Increasing the input frequency, measure the
frequencies at which demodulated output
appears at Pin 9, that is, "C_RL", and at which
demodulated output disappears at Pin 11, that is,
9 Demodulation Capture Range
"H_BH".
(3) : Input a 200 mV_p-p, 7 MHz sine wave into Pin 20.
(4) : Decreasing the input frequency, measure the frequencies at which demodulated
output appears at Pin 11, that is, "C_BH", and at which demodulated output
disappears at Pin 9, that is, "H_RL".
15
2005-03-14