AD7785 - ADI

The pictures are for reference only, and the specific specifications can be found in the product manual.

Part No

AD7785
Manufacturer

ADI
ChipWorker Part#

CW353113714
Description

3Channel, Low Noise, Low Power, 20Bit Σ-Δ ADC with On-Chip In-Amp and Reference
Documentation

Datasheet

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AD7785 Specifications

Attribute	Attribute Value

Part Number	AD7785
Manufacturer	ADI
ChipWorker Part#	CW353113714
Documentation	Datasheet
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Product Lifecycle Status	Active

Product Description

Product Details
The AD7785 is a low power, low noise, complete analog front ends for high precision measurement applications. It contains a low noise 20-bit Σ-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 device contains a precision low noise, low drift internal band gap reference and can also 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 being used to set the common-mode voltage of a channel to AVDD/2.
The device can be operated with either the internal clock or an external clock. The output data rate from the part is software-programmable and can be varied from 4.17 Hz to 470 Hz.
The part operates with a power supply from 2.7 V to 5.25 V. It consumes a current of 400 µA typical and is housed in 16-lead TSSOP packages.
**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
### Features and Benefits
Up to 20 bits effective resolution
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
3 differential inputs
Simultaneous 50 Hz/60 Hz rejection

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