TA8772AN
2002-01-17
13
Note B25: SW1 Threshold Voltage.
(1)
Pin 7 : Pulse OFF.
(2)
Pin 25 : OPEN.
(3)
Input 100kHz, 0.8Vp-p, sine wave to pin 26 with, 5.2V bias.
(4)
Connect external voltage supply to pin 24 observe pin 29 with changing supply voltage,
Measure the voltage of when output level is changed supply voltage to pin 24.
Note B26: SW2 Threshold Voltage.
(1)
Pin 7 : Pulse OFF.
(2)
Pin 24 : OPEN.
(3)
Input 100kHz, 0.8Vp-p, sine wave to pin 23.
(4)
Apply 4.5V to pin 28.
(5)
Apply 4.5V to pin 8.
(6)
Connect external voltage supply to pin 25 observe pin 29 with changing supply voltage,
Measure the voltage of when the signal appear at pin 29.
Note B27: VCO Free-run Frequency.
(1)
Pin 7 : Pulse OFF.
(2)
Measure the frequency of output signal at pin 10.
Note B28: VCO Max. Frequency.
(1)
Pin 7 : Pulse OFF.
(2)
Apply 3.0V to pin 9.
(3)
Measure the frequency of output signal at pin 10.
Note B29: VCO Min. Frequency.
(1)
Pin 7 : Pulse OFF.
(2)
Apply 3.0V to pin 9.
(3)
Measure the frequency of output signal at pin 10.
Note B30: Frequency Control Sensitivity.
(1)
Pin 7 : Pulse OFF.
(2)
Apply 4.2V to pin 9. (f10a)
(3)
Measure the frequency of output signal at pin 10.
(4)
Apply 4.8V to pin 9. (f10b)
(5)
Measure the frequency of output signal at pin 10.
(6)
Calculate frequency control sensitivity. (f10b f10a) / 0.6
Note B31: APC Pull-in Range (+)
(1)
Input 0.3V, 15.734kHz, 10s pulse to pin 7.
(2)
Observe pin 9 contain AFC is locked.
(3)
Increase input frequency due to unlock APC. Then decrease input frequency measure the input
frequency when APC is locked again. (f7a)
(4)
Calculate pull-in frequency. (f7a 15.734kHz)
Note B32: APC Pull-in Range ()
(1)
Input 0.3V, 15.734kHz, 10s pulse to pin 7.
(2)
Observe pin 9 contain AFC is locked.
(3)
Increase input frequency due to unlock APC. Then decrease input frequency measure the input
frequency when APC is locked again. (f7b)
(4)
Calculate pull-in frequency. (f7b 15.734kHz)
Note B33: VCO Output Level.
(1)
Input Sand Castle Pulse to pin 7.
(2)
Measure amplitude of output signal at pin 10.