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Running the Software

4.1.1.2 Tx Stage Subtab

The Tx Stage subtab under the Device Configuration tab, shown in Figure 24 for AFE4490 and Figure 25

for AFE4400, consists of the settings to:

1. Set LED1 and LED2 currents.

2. Program LED current control DAC through a pull-down menu.

3. Program the transmitter reference voltage through a pull-down menu (available for AFE4490 device

only).

4. Select between H-bridge mode and Push-pull mode.

NOTE: The AFE44x0SPO2EVM does not support Push-pull mode.

4.1.1.3 Rx Stage Subtab

The Rx Stage subtab under the Device Configuration tab, shown in Figure 26 for AFE4490 and Figure 27

for AFE4400, consists of the settings to:

1. Enable separate gain mode (available for AFE4490 device only).

2. Set feedback resistance and capacitance for the trans-impedance amplifier with separate gain mode

disabled.

3. Set feedback resistance and capacitance for the trans-impedance amplifier with separate gain mode

enabled (available for AFE4490 device only).

4. Enable second-stage and set gain for the second-stage amplifier.

5. Set ambient DAC current.

6. Select filter corner frequency (available for AFE4490 device only).

Figure 24. AFE4490: Device Configuration: Tx Stage

SLAU480C–January 2013–Revised May 2014 AFE4400 and AFE4490 Development Guide

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