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4.1.1.2 Tx Stage Subtab

The Tx Stage subtab under the Device Configuration tab, shown in Figure 18 for AFE4490 and Figure 19

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 20 for AFE4490 and Figure 21

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 18. AFE4490: Device Configuration: Tx Stage

AFE4400 and AFE4490 Development Guide SLAU480A–January 2013–Revised February 2013

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