Datasheet

7.3 Calibration
7.4 Typical Performance Measurements
www.ti.com Demonstration Kit Test Configuration Test Equipment
In order to measure the proper output power, the insertion loss of the analyzer cable must be calibrated.
Measure a calibrated 0-dBm source to see how much loss is in the cable at the frequency of interest.
The TSW3070EVM ac measurements at the transformer outputs can be used to verify the performance of
the DAC5682Z if necessary, or if a reference signal is needed when measuring the performance at the
OPA695 or THS3091/5 output. The OPA695 and THS3091/5 are both implemented in a differential-in to
single-ended-out configuration. The gain of the OPA695 has been set to 2.2x, and the THS3091/5 has
been set to a gain of 3.3x. The input on the OPA695 has an effective 25- Ω load on a 20-mA ac signal.
The input of the THS3091/5 has an effective 50- Ω load with a 20-mA ac signal.
Using the TSW3100 in the Multi-Tone GUI mode, a single tone can be generated and measured at both
outputs. This measurement must be verified first before any other testing or modification of the board is
attempted to ensure that all hardware and software interfaces are operational. The OPA695 output is
about 1.8 Vpp, whereas the THS3095 is about 5 Vpp.
Figure 8. Typical THS3091/5 Voltage Output, Default Gain 3.3x
SLWU055 – May 2008 TSW3070EVM: Amplifier Interface to Current Sink DAC - Arbitrary Waveform Generator Demonstration 19
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