| Sigma delta modulator frequency |
| | 4 |
| MHz |
| ADC voltage input range |
| –2.5 |
| 2.5 |
V |
| Number of bits |
| | 16 |
| bits |
| ADC 2's complement code for –2.5-V differential input |
2's Complement |
| 8000hex |
| LSB |
| ADC 2's complement code for 0-V differential input |
| | 0000hex |
| LSB |
| ADC 2's complement code for 2.5-V differential input |
| | 7FFFhex |
| LSB |
| Output sample period (no latency) |
Sample period control bit = 0b00 |
| 96 |
| µs |
| ADC multiplexer switching time |
| | | 1 |
µs |
| Effective number of bits (ENOB) |
Procedure to calculate ENOB:
- VDD = 5 V
- Temperature = –40°C, 25°C, 125°C, 150°C
- Connect 5-KΩ, Zero TC bridge to the pressure input pins device with near zero differential voltage
- Set P GAIN = 200 V/V
- Set ADC sample period to 96 µS
- Set input MUX to pressure channel
- Measure ADC
- Calculate ENOB using the formula: 20log10((32768/2/√2)/(ADC code
rms))/6.02
|
11.4 |
| | bits |
| ENOB in the presence of crosstalk between P and T channels |
Procedure to calculate ENOB in the presence of crosstalk:
- VDD = 5 V
- Temperature = –40°C, 25°C, 125°C, 150°C
- Connect 5-KΩ, Zero TC bridge to the pressure input pins device
- Set P GAIN = 200 V/V
- Set ADC sample period to 96 µS
- Connect 1-KHz, 1.25-V common mode, 1-Vpp sine wave through 100-Ω source impedance to temperature input pins device
- Set T GAIN = 1.33 V/V
- Set input MUX to pressure channel
- Measure ADC
- Calculate ENOB using the formula: 20log10((32768/2/√2)/(ADC code
rms))/6.02
|
11.4 |
| | bits |
| Linearity |
Procedure to calculate Linearity:
- VDD = 5 V
- Temperature = 25°C
- Connect 5-KΩ, Zero TC bridge to the pressure input pins of the device with 30%FS to 70%FS input voltages
- Set GAIN = 200 V/V
- Set ADC sample period to 96 µS
- Set input MUX to pressure channel
- Measure P ADC
- Calculate linearity as maximum deviation obtaining using end-point fit
|
| ±0.8 |
| %FS |