Demonstration Kit Test Configuration Test Equipment 7.1 Test
19
SLWU055A – May 2008 – Revised May 2016
Copyright © 2008–2016, Texas Instruments Incorporated
TSW3070EVM: Amplifier Interface to Current Sink DAC - Arbitrary Waveform
Generator Demonstration
7.4
Typical Performance Measurements
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, THS3091 or THS3095 output. The OPA695, THS3091 and THS3095 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 and THS3095 have 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 inputs of the THS3091 and THS3095 have 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 7. Typical THS3091 and THS3095 Voltage Output, Default Gain 3.3x
Figure 8. THS3091 and THS3095 With ±15-V External Supplies, 50-
Ω
Input, Gain at 10x
