AD7793 HIGH PRECISION ISOLATION K TYPE THERMOCOUPLE TEMPERATURE acquisition module PT100

AD7793 TEMPERATURE acquisition module

The AD7793 TEMPERATURE acquisition module, low noise, complete
analog front ends for high precision measurement applications.
The AD7792/AD7793 contain a low noise 16-/24-bit ∑-Δ ADC
with three differential analog inputs. The on-chip, low noise
instrumentation amplifier means that signals of small amplitude can be interfaced directly to the ADC. With a gain
setting of 64, the rms noise is 40 nV when the update rate
equals 4.17 Hz.
The AD7793 TEMPERATURE acquisition module devices contain a precision low noise, low drift internal
band gap reference and can accept an external differential
reference. Other on-chip features include programmable
excitation current sources, burnout currents, and a bias voltage
generator. The bias voltage generator sets the common-mode
voltage of a channel to AVDD/2.
The devices can be operated with either the internal clock or an
external clock. The output data rate from the parts is softwareprogrammable and can be varied from 4.17 Hz to 470 Hz.
The parts operate with a power supply from 2.7 V to 5.25 V.
They consume a current of 400 μA typical and are housed in a
16-lead TSSOP package.

FEATURES:

• Up to 23 bits effective resolution
• RMS noise
• 40 nV @ 4.17 Hz
• 85 nV @ 16.7 Hz
• Current: 400 μA typical
• Power-down: 1 μA maximum
• Low noise programmable gain instrumentation amp
• Band gap reference with 4 ppm/°C drift typical
• Update rate: 4.17 Hz to 470 Hz
• 3 differential inputs
• Internal clock oscillator
• Simultaneous 50 Hz/60 Hz rejection
• Programmable current sources
• On-chip bias voltage generator
• Burnout currents
• Power supply: 2.7 V to 5.25 V
• –40°C to 105°C temperature range
• Independent interface power supply
• 16-lead TSSOP package
• Interface
• 3-wire serial
• SPI®, QSPIâ„¢, MICROWIREâ„¢, and DSP compatible
• Schmitt trigger on SCLK