AD7782

PRODUCTION

AD7782

2-Channel, Read-Only, Pin-Configured, 24-bit Sigma-Delta ADC

PRODUCTION

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Features

2-Channel, 24-Bit Σ-Δ ADC
Pin Configurable (No Programmable Registers)
Pin Selectable Input Channels
Pin Programmable Input Ranges (±2.56 V or ±160 mV)
Fixed 19.79 Hz Update Rate
Simultaneous 50 Hz and 60 Hz Rejection
24-Bit No Missing Codes

Interface
Master or Slave Mode of Operation
Power
Specified for Single 3 V and 5 V Operation
Normal: 1.3 mA @ 3 V
Power-Down: 9 µA
See data sheet for additional features

Additional Details

The AD7782 is a complete analog front end for low-frequency measurement applications. The 24-bit sigma-delta ADC contains two fully differential analog input channels that can be configured with a gain of 1 or 16 allowing full-scale input signal ranges of ±2.56 V or ± 160 mV from a +2.5 V differential reference input.

The AD7782 has an extremely simple, read-only digital interface which can be operated in master mode or slave mode. There are no on-chip registers to be programmed. The input signal range and input channel selection are configured using two external pins.

The device operates from a 32.768 kHz crystal with an on-chip PLL generating the required internal operating frequency. The output data rate from the part is fixed via the master clock at 19.79 Hz and provides simultaneous 50 Hz and 60 Hz rejection at this update rate. Eighteen-bit p-p resolution can be obtained at this update rate.

The part operates from a single 3 V or 5 V supply. When operating from 3 V supplies, the power dissipation for the part is 3.9 mW. The AD7782 is available in a 16-lead TSSOP package.

Another part in the AD778x family is the AD7783. It is similar to the AD7782 except it has two integrated current sources and only one differential input channel.

APPLICATIONS

Sensor Measurement
Industrial Process Control
Temperature Measurement
Pressure Measurements
Weigh Scales
Portable Instrumentation

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Analog Devices Support Portal is a one-stop shop to answer all your ADI questions.

Visit the ADI Support Page

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FAQs

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Part Models 3

1ku List Price Starting From $5.45

Technical Documents 14

AD7782: Read Only, Pin Configured 24-Bit Sigma-Delta ADC Datasheet (Rev.A) 09/28/2006

AN-611: 50 Hz/60Hz Rejection on Sigma-Delta ADCs (Rev.0) 08/15/2003

AN-968: Current Sources: Options and Circuits (Rev.0) 10/22/2008

AN-397: Electrically Induced Damage to Standard Linear Integrated Circuits: 11/18/2002

AN-614: Using the AD7782 in Low Power Applications (Rev.0) 08/15/2003

AN-610: The PGA on Sigma-Delta ADCs (Rev.A) 02/14/2015

AN-615: Peak-to-Peak Resolution Versus Effective Resolution (Rev.0) 12/21/2004

AN-311: How to Reliably Protect CMOS Circuits Against Power Supply Overvoltaging 03/08/2008

AN-608: Input Buffers on Sigma-Delta ADCs (Rev.0) 02/14/2015

AN-609: Chopping on Sigma-Delta ADCs (Rev.0) 02/14/2015

AN-202: An IC Amplifier User’s Guide to Decoupling, Grounding, and Making Things Go Right for a Change (Rev.B) 02/14/2015

AN-607: Selecting a Low Bandwidth (<15 kSPS) Sigma-Delta ADC 10/01/2006

Delta-Sigma Rocks RF, As ADC Designers Jump On Jitter 01/12/2006

Designing Power Supplies for High Speed ADC 02/01/2012

Design Resources 3

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
AD7782BRUZ	16-Lead TSSOP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
AD7782BRUZ-REEL	16-Lead TSSOP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
AD7782BRUZ-REEL7	16-Lead TSSOP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys