National Semiconductor DAC5682Z, User Manual

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Optional Configurations
25 SLWU055A – May 2008 – Revised May 2016
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TSW3070EVM: Amplifier Interface to Current Sink DAC - Arbitrary Waveform
Generator Demonstration
9 Optional Configurations
9.1 External VCXO
It is possible to configure the TSW3070EVM to use an external VCXO for application flexibility. J13 and
J14 can be used in position 2-3 to select an external VCXO or clock signal.
9.2 Transformer Passive Output
The board is by default set up to output signals through the OPA695, THS3091, and THS3095. These
devices can be individually bypassed to a transformer output, if needed. To bypass the OPA695, move R6
to R109, and R15 to R134. To bypass the THS3091 and THS3095, move R20 to R135, and R27 to R136.
Figure 17. DAC5682Z Resistor Jumper Configuration
The blue denotes the default configuration (operational amplifier output), whereas the yellow denotes the
transformer output option.
Table 6. Optional Output Signal Path
R109 R134 R15 R6
Bypass OPA695 Install Install Remove Remove
Use OPA695 (default) Remove Remove Install Install
R135 R136 R20 R27
Bypass THS3091 and THS3095 Install Install Remove Remove
Use THS3095 (default) Remove Remove Install Install