Datasheet

Demonstration Kit Test Configuration Test Equipment www.ti.com
Figure 9. THS3091/5 With +/-15-V External Supplies, 50- Ω Input, Gain at 10x
A low-pass filter (LPF) is between the DAC outputs and the OPA695 and THS3091/5. This prevents any
higher frequency DAC images from affecting performance of the amplifiers. The wide bandwidth OPA695
is typically operated at lower gains with smaller output swings with a wider input LPF, about 200 MHz. The
THS3095 is normally operated at larger gains (larger feedback resistor) and larger output swings which
results in narrower output bandwidth. Consequently, the LPF for the THS3091/5 is set lower at 100 MHz.
Both LPFs are 50- Ω differential, fifth-order Chebyshev filters with a 0.1-dB ripple. Filter design can be
done according to application report SLWA053 with freely available tools.
20 TSW3070EVM: Amplifier Interface to Current Sink DAC - Arbitrary Waveform Generator Demonstration SLWU055 – May 2008
Submit Documentation Feedback