Clock Circuit Calibration
• Monitor TP7 (w.r.t. DGND TP) with DVM and adjust R20
for 0 V ±50 mV
• Monitor TP6 (w.r.t. DGND TP) with DVM and adjust R21
for -1.3 V ±50 mV
• Set the generator # 2 to 5 MHz and ± 2 Vp-p sinewave
• Set SW1 switch to HS position
• Monitor PJ1 and PJ2 probe jacks with scope and adjust
R20 potentiometer to obtain a 50% duty cycle (approxi-
mately)
• Set the generator # 2 to 500 Hz and ± 2 Vp-p sinewave
• Set SW1 switch to LS position
• Monitor PJ1 and PJ2 probe jacks with scope and adjust
R21 potentiometer to get a clean transition.
HDAC52160 Calibration
• Set CCLK to 1 kHz, ECL logic and connect DVM to DAC
OUT
• Connect VIN to VFT and monitor the DAC OUT signal
with DVM
• Adjust R27 for -2.500 V
• Connect VIN to VFB
• Adjust R26 for +2.4951 V
SPT
AN7810/14
11
12/11/91