
TA8772AN
2002-01-17
14
Note B34: AGC Max. Gain.
(1)
Input Sand Castle Pulse to pin 7.
(2)
Pin 24 : OPEN.
(3)
Apply 9.0V to pin 25.
(4)
Apply 2.0V to pin 8.
(5)
Input 100kHz, sine wave signal, which is synchronized with fH, to pin 23.
(6)
Observe pin 29, Measure input signal amplitude. At pin 23 when output signal amplitude is
0.8Vp-p at pin 29. (V23a)
(7)
Calculate gain. G = 20og (0.8 / V23a)
Note B35: AGC Min. Gain.
(1)
Input Sand Castle Pulse to pin 7.
(2)
Pin 24 : OPEN.
(3)
Apply 9.0V to pin 25.
(4)
Apply 7.0V to pin 8.
(5)
Input 100kHz, sine wave signal, which is synchronized with fH, to pin 23.
(6)
Observe pin 29, Measure input signal amplitude. At pin 23 when output signal amplitude is
0.8Vp-p at pin 29. (V23b)
(7)
Calculate gain. G = 20og (0.8 / V23b)
Note B36: AGC Knee Level (+)
(1)
Input Sand Castle Pulse to pin 7.
(2)
Apply 9.0V to pin 24.
(3)
Apply 9.0V to pin 25.
(4)
Input 100kHz, sine wave signal, which is synchronized with fH, to pin 26.
(5)
Connect pin 3 to pin 23 via amplifier.
(6)
Set the input level at pin 23 is 0.8Vp-p by adjusting gain of amplifier.
(7)
Measure output signal at pin 29. (V29)
(8)
Measure input signal amplitude at pin 23 when the output signal amplitude at pin 29 is 0.5dB
bigger than V29 with adjusting gain of amplifier. (V23a)
(9)
Calculate knee level. 20og (V23a / 0.8)
Note B37: AGC Knee Level ()
(1)
Input Sand Castle Pulse to pin 7.
(2)
Apply 9.0V to pin 24.
(3)
Apply 9.0V to pin 25.
(4)
Input 100kHz, sine wave signal, which is synchronized with fH, to pin 26.
(5)
Connect pin 3 to pin 23 via amplifier.
(6)
Set the input level at pin 23 is 0.8Vp-p by adjusting gain of amplifier.
(7)
Measure output signal at pin 29. (V29)
(8)
Measure input signal amplitude at pin 23 when the output signal amplitude at pin 29 is
0.5dB bigger than V29 with adjusting gain of amplifier. (V23b)
(9)
Calculate knee level. 20og (V23b / 0.8)
Note B38: Clamp Det (+)
(1)
Pin 7 : GP Pulse ON.
(2)
Apply 2.0V to pin 8.
(3)
Apply 9.0V to pin 25.
(4)
Pin 24 : OPEN.
(5)
Apply 4.5V to pin 23.
(6)
Measure voltage at pin 29. (V29)
(7)
Apply 5.0V to pin 23.
(8)
Measure voltage at pin 29. (V29a)
(9)
Calculate voltage change. (V29a V29)