Datasheet

1 TSW7001EVM Configuration Options
1.1 Board Configuration
TSW7001EVM Configuration Options www.ti.com
1 TSW7001EVM ............................................................................................................... 1
2 Optional Onboard OPA656 Transimpedance Input Stage. ............................................................. 2
3 TSW7001EVM Block Diagram ............................................................................................. 3
4 VCA824 Schematic .......................................................................................................... 3
5 TSW7001 Control Voltage GUI ............................................................................................ 9
6 TSW7001 Output for Step Function ....................................................................................... 9
7 TSW7001 Ramp Output ................................................................................................... 10
8 TSW7001 Arbitrary Gain Profile Panel .................................................................................. 10
9 Output of TSW7001 With Arbitrary Gain Profile ........................................................................ 11
10 TSW7001 Test Setup ...................................................................................................... 12
11 IMD3 Plot for TSW7001 at 10 MHz ...................................................................................... 13
12 IMD3 for TSW7001 in 40-dB Gain Mode ................................................................................ 13
13 Harmonic Distortion for TSW7001 in 40-dB Gain Mode .............................................................. 14
14 Optional Path for OPA656 Input Buffer/Transimpedance Amplifier. ................................................. 15
List of Tables
1 Input and Output Connections ............................................................................................ 11
2 Bill of Materials ............................................................................................................. 16
The TSW7001 evaluation module (EVM) can be configured to have an optional transimpedance input
stage using an OPA656 operational amplifier. In the default configuration, the OPA656 is bypassed and
the input is directly connected to the input of the VCA824 amplifier. The voltage supplies for the amplifiers
also can be optionally configured for external offboard supplies. This section outlines the various
components and configurations.
The EVM is by default configured to bypass the optional input transimpedance gain stage. This stage can
be enabled by connecting the SJP5 and SJP6 solder jumpers in the 2-3 position as shown in Figure 2 . In
this configuration, the transimpedance gain of the OPA656 circuit has to be optimized for the particular
input load/sensor input capacitance [see Section 11 , Ref 1].
Figure 2. Optional Onboard OPA656 Transimpedance Input Stage.
Voltage-Controlled Amplifier Evaluation Kit2 SLWU058 – August 2008
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