SLDS204B October 2014 – June 2020 PGA300
PRODUCTION DATA.
The temperature signal path contains a decimation filter with an internal output rate of 128 µs.
The output of the decimation filter in the temperature signal path is a 16-bit signed value. Some example decimation output codes for given differential voltages at the input of the sigma-delta modulator are shown in Table 3.
SIGMA-DELTA MODULATOR DIFFERENTIAL INPUT VOLTAGE | 16-BIT NOISE-FREE DECIMATOR OUTPUT |
---|---|
–2.5 V | –32 768 (0x8000) |
–1.25 V | –16 384 (0xC000) |
0 V | 0 (0x0000) |
1.25 V | 16 383 (0x3FFF) |
2.5 V | 32 767 (0x7FFF) |
The nominal relationship between the internal temperature sensor and the 16-bit T ADC code for T Gain = 5 V/V is shown in Equation 1.
where