Datasheet

4 Evaluation
4.1 TSW1200 Capture Board
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5
4.2 Quick-Test Results
www.ti.com Evaluation
The TSW1200 board can be used to analyze the performance of the EVM. The TSW1200EVM is a circuit
board that assists designers in prototyping and evaluating the performance of high-speed ADCs that
feature parallel or serialized LVDS outputs. The TSW1200 has the LVDS 100- Ω termination resistor on the
input interface for ADC outputs.
To start the TSW1200 software, note the following points.
Figure 6. TSW1200 GUI Introduction
1. Select the ADC type to be used before capturing.
2. For test, select Single Tone FFT plot.
3. For the ADC Sampling Rate, type in the value.
4. Type in the ADC Input Frequency. Auto calculation of the input frequency depends on the FFT record
length. As soon as the number is entered, the software calculates the coherent input frequency
corresponding to that FFT length. This frequency signal must be supplied through the signal generator.
5. Select the FFT Record Length.
6. Select Capture to obtain the plot
7. The Continuous Capture option is used if the user wants to continuously capture the FFT.
Adjust the input level signal to attain the dBFs of approximately -1.
The user can make the jumper setting as mentioned in Table 1 . In this configuration, the EVM uses an
external clock source from J19 and a direct input signal J6 to the ADC. This setup uses Power Option 2
(Table 3 ), Clock Option 1 (Table 5 ), and Analog Input Option 1 (Table 7 ), which is the default on the EVM.
Figure 7 shows the ADC performance capture using TSW1200 with the input signal of a 100-MHz
frequency and clock frequency of 245.76 MHz with ADS6149.
SLWU061A – December 2008 – Revised June 2009 ADS61x9/55xxEVM 19
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