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AD7795

Analog Devices
Part Number AD7795
Manufacturer Analog Devices
Description 24-/16-Bit ADC
Published Jun 8, 2010
Detailed Description www.DataSheet4U.com 6-Channel, Low Noise, Low Power, 24-/16-Bit ∑-Δ ADC with On-Chip In-Amp and Reference AD7794/AD7795...
Datasheet PDF File AD7795 PDF File

AD7795
AD7795

Overview
www.
DataSheet4U.
com 6-Channel, Low Noise, Low Power, 24-/16-Bit ∑-Δ ADC with On-Chip In-Amp and Reference AD7794/AD7795 FEATURES Up to 23 effective bits RMS noise: 40 nV @ 4.
17 Hz 85 nV @ 16.
7 Hz Current: 400 μA typ Power-down: 1 μA max Low noise, programmable gain, instrumentation amp Band gap reference with 4 ppm/°C drift typ Update rate: 4.
17 Hz to 470 Hz Six differential analog inputs Internal clock oscillator Simultaneous 50 Hz/60 Hz rejection Reference detect Programmable current sources On-chip bias voltage generator Burnout currents Low-side power switch Power supply: 2.
7 V to 5.
25 V –40°C to +105°C temperature range Independent interface power supply 24-lead TSSOP 3-wire serial interface SPI®, QSPI™, MICROWIRE™, and DSP compatible Schmitt trigger on SCLK Gas analysis Industrial process control Instrumentation Blood analysis Smart transmitters Liquid/gas chromatography 6-digit DVM GENERAL DESCRIPTION The AD7794/AD7795 are low power, low noise, complete analog front ends for high precision measurement applications.
They contain a low noise, 24-/16-bit ∑-Δ ADC with six differential inputs.
The on-chip low noise instrumentation amplifier means that signals of small amplitude can be interfaced directly to the ADC.
Each device contains a precision, low noise, low drift internal band gap reference, and can also accept up to two external differential references.
Other on-chip features include programmable excitation current sources, burnout currents, and a bias voltage generator, which is used to set the commonmode voltage of a channel to AVDD/2.
The low-side power switch can be used to power down bridge sensors between conversions, minimizing the system’s power consumption.
The AD7794/AD7795 can operate with either an internal clock or an external clock.
The output data rate from each part can vary from 4.
17 Hz to 470 Hz.
Both parts operate with a power supply from 2.
7 V to 5.
25 V.
Each consumes a current of 400 μA typical and is housed in a 24-lead TSSOP.
APPL...


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