SLDS204B October 2014 – June 2020 PGA300
PRODUCTION DATA.
The device has the ability to perform temperature compensation via an internal or external temperature sensor. The user can select the source of the temperature measurement with the TEMP_MUX_CTRL[3:0] bits in the TEMP_CTRL register. The device connects to an external temperature sensor via the INT+ and INT– pins.
The T Gain block is constructed with a low-flicker-noise, low-offset, chopper-stabilized amplifier. The gain is configured using the T_GAIN[1:0] bits in the T_GAIN_SELECT register. Figure 5 shows the T Gain amplifier topology.
The T Gain amplifier can be configured for single-ended or differential operation using the TEMP_SE bit in the TEMP_SE register. When the T Gain amplifier is configured for single-ended operation, the differential voltage converted by the T ADC is with respect to ground. The T Gain amplifier must be set up for either single-ended or differential configuration, depending on the source of signal to the T Gain stage. Table 2 shows the configuration that the user must select for the different temperature sources.
TEMPERATURE SOURCE | T GAIN CONFIGURATION |
---|---|
Internal temperature sensor | Single-ended |
External temperature sensor with one terminal of the sensor connected to ground | Single-ended |
External temperature sensor with neither terminal of the sensor connected to ground | Differential |
The T Gain value must be set based on the temperature sense element used: