Datasheet

AD9959
Rev. B | Page 17 of 44
EQUIVALENT INPUT AND OUTPUT CIRCUITS
AVOID OVERDRIVING
DIGITAL INPUTS.
FORWARD BIASING
DIODES MAY COUPLE
DIGITAL NOISE ON
POWER PINS.
DVDD_I/O = 3.3V
INPUT OUTPUT
05246-002
Figure 29. CMOS Digital Inputs
TERMINATE OUTPUTS
INTO AVDD. DO NOT
EXCEED VOLTAGE
COMPLIANCE OF
OUTPUTS.
CHx_IOUT
05246-032
CHx_IOUT
Figure 30. DAC Outputs
05246-033
AMP
REF_CLK REF_CLK
AVDD
1.5kΩ
A
V
DD
1.5kΩ
AVDD
Z Z
REF_CLK INPUTS ARE
INTERNALLY BIASED AND
NEED TO BE AC-COUPLED.
OSC INPUTS ARE DC-COUPLED.
OSCOSC
Figure 31. REF_CLK/
REF_CLK
Inputs