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AD7798

Analog Devices
Part Number AD7798
Manufacturer Analog Devices
Description 3-Channel Low Noise Low Power ADC
Published Mar 27, 2010
Detailed Description 04856-001 Data Sheet 3-Channel, Low Noise, Low Power, 16-/24-Bit, Σ-Δ ADC with On-Chip In-Amp AD7798/AD7799 FEATURES ...
Datasheet PDF File AD7798 PDF File

AD7798
AD7798

Overview
04856-001 Data Sheet 3-Channel, Low Noise, Low Power, 16-/24-Bit, Σ-Δ ADC with On-Chip In-Amp AD7798/AD7799 FEATURES RMS noise: 27 nV at 4.
17 Hz (AD7799) 65 nV at 16.
7 Hz (AD7799) 40 nV at 4.
17 Hz (AD7798) 85 nV at 16.
7 Hz (AD7798) Current: 380 µA typical Power-down: 1 µA maximum Low noise, programmable gain, instrumentation amp Update rate: 4.
17 Hz to 470 Hz 3 differential inputs Internal clock oscillator Simultaneous 50 Hz/60 Hz rejection Reference detect Low-side power switch Programmable digital outputs 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®, QSPI™, MICROWIRE™, and DSP compatible Schmitt trigger on SCLK APPLICATIONS Weigh scales Pressure measurement Strain gauge transducers Gas analysis Industrial process control Instrumentation Portable instrumentation Blood analysis Smart transmitters Liquid/gas chromotography 6-digit DVM FUNCTIONAL BLOCK DIAGRAM GND AVDD REFIN(+) REFIN(–) AD7798/AD7799 REFERENCE DETECT AIN1(+) AIN1(–) AIN2(+) AIN2(–) AIN3(+)/P1 AIN3(–)/P2 PSW AVDD MUX IN-AMP Σ-Δ ADC GND GND INTERNAL CLOCK Figure 1.
SERIAL INTERFACE AND CONTROL LOGIC AD7798: 16-BIT AD7799: 24-BIT DOUT/RDY DIN SCLK CS DVDD GENERAL DESCRIPTION The AD7798/AD7799 are low power, low noise, complete analog front ends for high precision measurement applications.
The AD7798/AD7799 contains a low noise, 16-/24-bit ∑-∆ 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 27 nV for the AD7799 and 40 nV for the AD7798 when the update rate equals 4.
17 Hz.
On-chip features include a low-side power switch, reference detect, programmable digital output pins, burnout currents, and an internal clock oscillator.
The output data rate from the part is software-programmable and can be varied from 4...


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