Running the Software
4.1.1.2
Tx Stage Subtab
The Tx Stage subtab under the Device Configuration tab, shown in
for AFE4490 and
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
for AFE4490 and
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
16
AFE4400 and AFE4490 Development Guide
SLAU480A – January 2013 – Revised February 2013
Copyright © 2013, Texas Instruments Incorporated