NAFE73388 GAIN SETTING

[jathishjk]

NAFE73388 GAIN SETTING, Iam not able to set PGA Gain above 1V/V in NAFE73388. Datasheet says it support gain upyo 16V/V. But configuration register setting does not accept settings value for 1V/V and above. Please clarify.

[jathishjk]

Thank you for the reply. Need some more clarification on configuring a channel for a gain of 16. It will be helpful if you could give the registers value to be set for PGA gain and gaincoefficient register setting for this.    

[ErikaC]

Hello

To help resolve the issue, please provide details about your current configuration: Which channel(s) are you using and in what mode (single-ended or differential)? How is the input signal connected and what is the expected voltage range? What exact values are you writing to the registers for PGA gain adjustment, and could you share the configuration of CH_CONFIG0, CH_CONFIG1, and CH_CONFIG2? 

[jathishjk]

We are using all AI1-AI4channels in differential mode. Voltage range we need to acquire in 0-1V. Please see the portion of the datasheet which shows configuration for gain above 1V/V is unused?  

[ErikaC]

Hello

Thank you for the clarification. If you need to configure gains higher than 1 V/V, this cannot be done using the 16‑bit CH_GAIN field, since its maximum value is 0.8 V/V.

Instead, you must use the 24‑bit calibrated coefficient registers, specifically:
GAIN_COEF0..15 — addresses 0x80h–0x8Fh

Please see section 7.3.6 Gain and offset calibration and Table 30. 24-bit channel-based coefficient and data registers

These registers allow you to apply any effective gain greater than 1 V/V, since they function as 24‑bit multiplicative calibration coefficients.

Hope this helps!