The section controls the setup of the digital

interface as well as test modes and digital

features such as decimation and loopback

The general setup tab includes

controls for the digital RX interface

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Initial EVM Setup and Basic Test Procedure

4.2

RX Path Using TSW1200

First the AFE722x digital interface needs to be configured to match the serial LVDS interface that the

TSW1200 is expecting. The following control registers need to be set in the

‘General Setup’ tab of the

AFE722x programming software. Also the USB communication warning sign should be monitored after the

USB reset to ensure proper communication with the AFE722x EVM.

Register Bit

Setting

Interface

Serial LVDS

Master Override

Enabled

Format

Offset Binary

Serial LVDS

2 Wire

Data Orientation

MSB First

SDR Mode

Disabled

Wordwise Output

Disabled

Bitwise RX

Disabled

Halfrx in 2wire

Disabled

In the TSW1200 software, the AFE722x should be selected as the ADC. Next the sampling rate and ADC

input frequency need to be entered and the TSW1200 software will calculate the coherent frequency.

Performing a capture should yield:

Fs=122.88Msps

Fin= 9.98625MHz

5

SLOU330

– December 2011

EVM Description

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