AD7792BRUZ-REEL Data Converter IC ADC 3Ch Lo Noise Lo Pwr 16B w/ On-Chip Ref
dac integrated circuit
,da converter chip
AD7792BRUZ-REEL Data Converter IC ADC 3Ch Lo Noise Lo Pwr 16B w/ On-Chip Ref
FEATURES
- FUNCTIONAL BLOCK DIAGRAM
- 3-Channel, Low Noise, Low Power, 16-/24-Bit ∑-Δ ADC with On-Chip In-Amp and Reference
- Up to 23 bits effective resolution
- RMS noise
- 40 nV @ 4.17 Hz
- 85 nV @ 16.7 Hz AVDD Current: 400 μA typical
- AIN1(+)
- Power-down: 1 μA maximum AIN1(–) MUX AIN2(+)
- DOUT/RDY
- GND AVDD
- REFIN(+)/AIN3(+) REFIN(–)/AIN3(–)
- GND
- DIN ADC SCLK
- AD7792/AD7793
- VBIAS
- BAND GAP REFERENCE
- INTERNAL CLOCK
- SERIAL INTERFACE AND CONTROL LOGIC
- Low noise programmable gain instrumentation amp AIN2(–) Band gap reference with 4 ppm/°C drift typical
- BUF
- IN-AMP Σ-Δ
- 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®, QSPITM, MICROWIRETM, and DSP compatible Schmitt trigger on SCLK
APPLICATIONS
- Thermocouple measurements RTD measurements Thermistor measurements Gas analysis
- Industrial process control Instrumentation Portable instrumentation Blood analysis
- Smart transmitters Liquid/gas chromatography 6-digit DVM
GENERAL DESCRIPTION
The AD7792/AD7793 are low power, 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 ampli- tude 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 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 software- programmable 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.
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