AD7781BRUZ - ADI

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

Part No

AD7781BRUZ
Manufacturer

ADI
ChipWorker Part#

CW3258365
Category

Analog to Digital, ADC IC
Package

TSSOP-16
Description

ANALOG DEVICES AD7781BRUZ Analogue to Digital Converter, 20Bit, 16.7 SPS, Single, 2.7V, 5.25V, TSSOP
Documentation

Datasheet

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AD7781BRUZ Specifications

Attribute	Attribute Value

Part Number	AD7781BRUZ
Manufacturer	ADI
ChipWorker Part#	CW3258365
Category	Analog to Digital, ADC IC
Documentation	Datasheet
Mounting Style	Surface Mount
Number of Pins	16 Pin
Case/Package	TSSOP-16
Number of Circuits	1 Circuit
Number of Channels	1 Channel
Number of Positions	16 Position
Number of Bits	20 Bit
Power Dissipation	2.10 mW
Sample Rate	16.7 SPS
Resolution (Bits)	20.0 Bit
Number of ADCs	1 ADC
Number of Inputs	1 Input
Operating Temperature (Max)	105 ℃
Operating Temperature (Min)	-40 ℃
Number of Input Channels	1 Channel
Supply Voltage (Max)	5.25 V
Supply Voltage (Min)	2.7 V
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Size-Length	5.1 mm
Size-Width	5.1 mm
Size-Height	1.05 mm
Operating Temperature	-40℃ ~ 105℃
Product Lifecycle Status	Active
Packaging	Tube
RoHS	RoHS Compliant
Lead-Free Status	Lead Free
REACH SVHC Compliance	No SVHC
Mil-Spec	No
REACH SVHC Compliance Edition	2015/12/17
ECCN Code	EAR99

Product Description

Product Details
The AD7781 is a complete low power front-end solution for bridge sensor products, including weigh scales, strain gages, and pressure sensors. It contains a precision low power 20-bit sigma-delta (Σ-Δ) ADC, an on-chip, low noise programmable gain amplifier (PGA), and an on-chip oscillator.
Consuming only 330 μA, the AD7781 is particularly suitable for portable or battery-operated products where very low power is required. The AD7781 also has a power-down mode that allows the user to switch off the power to the bridge sensor and power down the AD7781 when not converting, thus increasing the battery life of the product.
For ease of use, all the features of the AD7781 are controlled by dedicated pins. Each time that a data read occurs, eight status bits are appended to the 20-bit conversion. These status bits contain a pattern sequence that can be used to confirm the validity of the serial transfer.
The on-chip PGA has a gain of 1 or 128, supporting a full-scale differential input of ±5 V or ±39 mV. The device has two filter response options. The filter response at the 16.7 Hz update rate provides superior dynamic performance. The settling time is 120 ms at this update rate. At the 10 Hz update rate, the filter response provides better than -45 dB of stop-band attenuation. In load cell applications, this stop-band rejection is useful to reject low frequency mechanical vibrations of the load cell. The settling time is 300 ms at this update rate. Simultaneous 50 Hz/60 Hz rejection occurs at both the 10 Hz and 16.7 Hz update rates.
The AD7781 operates with a power supply from 2.7 V to 5.25 V. It is available in a narrow body, 14-lead SOIC package and in a 16-lead TSSOP package.
**Applications**
Weigh scales
Pressure measurement
Industrial process control
Portable instrumentation
### Features and Benefits
Pin-programmable filter response
Update rate: 10 Hz or 16.7 Hz
Pin-programmable in-amp gain
Pin-programmable power-down and reset
Status function
|
Internal clock oscillator
Internal bridge power-down switch
Current:
115 μA typical (Gain = 1)
330 μA typical (Gain = 128)
Simultaneous 50 Hz/60 Hz rejection
Please see data sheet for additional features
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