This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

AFE7225: AUXDAC_A and AUXDAC_B output voltage is not matching with same register configured values

Part Number: AFE7225

Hi TI Support team,

         We are configured both AUXDAC_A and AUXDAC_B channels with same external and internal termination resistor values and written same values for both 0x248 and 0x249 registers. But the measured voltage is not matching with both channels.

Please let me know why both channel outputs are not matching??

Hardware configuration:

For both AUXDAC_A and AUXDAC_B channels 402ohm external termination resistor is used.

Software configuration:

Below listed registers are configured to enable and control the AUX DAC output current.

Register 0x242 : A3 ( To enable both AUX DAC with internal 400ohm resistors)

Register 0x248 and 0x249 register are written with below values to set different output current and output voltage is measured.

0x248

0x249

OUTPUT CURRENT (mA)

AUXDAC_A output

AUXDAC_B output

0x0F

0x0F

2.5mA

400mV

460mV

0x0C

0x0C

3mA

460mV

564mV

0x0D

0x0D

3.5mA

550mV

664mV

0x02

0x02

4mA

623mV

757mv

0x03

0x03

4.5mA

722mV

847mV

0x00

0x00

5mA

798mV

947mV

0x01

0x01

5.5mA

876mV

1.05V

0x06

0x06

6mA

947mV

1.13V

0x07

0x07

6.5mA

1.03V

1.22V

0x04

0x04

7mA

1.10V

1.32V

0x05

0x05

7.5mA

1.22V

1.42V