Texas Instruments ADS42 EVM Series, User Manual

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Optional Configurations
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2.6 ADS42xx Performance Results
Figure 5 shows the performance result at 250 MSPS clock frequency and with a 170 MHz input tone.
Figure 5. FFT Plot: 250 MHz Clock, 170 MHz Input
3 Optional Configurations
3.1 THS4509 Input Op-Amp Configuration
The default analog input configuration is transformer coupling through T1 and T2 for channel A, and T3
and T4 for channel B. The optional configuration for analog input is through an Operational-Amplifier
THS4509. The changes required to modify the transformer coupled input to the OPA-driven input are
shown in
Table 3 .
Table 3. Jumper Setting for Transformer-Coupled or OPA-Driven Input
Jumpers or 0 Ω Transformer-Coupled Input (default) OPA-Driven Input
R119 Install Do not install
R123 Install Do not install
R120 Do not install install
R129 Do not install install
R143 Install Do not install
R141 Install Do not install
R131 Do not install Install
R132 Do not install Install
R93 Install Do not install
R94 Install Do not install
R95 Do not install Install
R96 Do not install Install
R97 Install Do not install
R98 Install Do not install
R99 Do not install Install
R114 Do not install Install
SJP3 Shunt 2 3, default Shunt 1 2
SJP4 Shunt 2 3, default Shunt 1 2
8 ADS42xx EVM SLAU333 – March 2011
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