Datasheet

10MHz

Ref

BPF

USB

3.3V

6V Input

TSW1200

CLK IN

AIN +

Quick Start Setup

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4 Quick Start Setup

1. Set up the ADS41xxEVM according the following diagram.

• Two signal generators are used and externally locked through the 10-MHz reference. Furthermore,

bandpass filters on clock and data input are used to minimize spurs and noise created by the

signal generators. Depending on filter attenuation, the clock generator amplitude must be set to

10-13 dBm.

• USB connection of the PC to ADS41xxEVM as well as TSW1200 must be established and if

necessary the USB drivers installed accordingly (see Section 3.2).

• The ADS41xx EVM requires a 3.3V power supply and the TSW1200 the 6-V wall wart.

2. If Serial mode (SPI) is used, ensure that jumpers are set for SPI mode (SCLK, SDATA, SEN).

3. Configure the following SPI registers:

• Reset USB.

• Reset ADC.

• Disable low latency mode (ADS41xx only).

• Enable gain (ADS41xx only).

• Set gain to 1 dB (ADS41xx only).

4. Configure the TSW1200 (see Figure 9).

• Select correct ADC from ADC selection pull down menu

• Press control + shift + I to initialize the TSW1200.

• Enter sampling rate (e.g., 245.76 Msps).

• Enter input frequency, and then enter calculated coherent frequency into the signal generator (e.g.,

10 MHz).

• Select ‘Single Tone FFT.’

• Hit capture to perform a measurement.

• Adjust input signal amplitude until fundamental amplitude reaches ~ –1 dBFS.

5. Measurement is illustrated in Figure 10.

ADS41xx/58B18EVM SLWU067C–November 2009–Revised May 2012

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