Manufacturer Part Number

AD7761BSTZ-RL

Description

16-bit analog to digital converter uses sigma-delta architecture for high precision. 8 differential inputs for simultaneous sampling. Packaged in a 64-pin LQFP (10x10mm). Offers high accuracy and signal integrity with external reference support. Obsolete product, so availability is limited to existing stock. Ideal for multi-channel data acquisition applications.

Specifications

Resolution: 16 bits

Sample Rate: 256k samples per second

Inputs: 8 differential channels

Data Interface: SPI serial communication

Supply Voltage (Analog): 2V to 5.5V

Operating Temperature: -40°C to 105°C

Package: 64-pin LQFP, moisture sensitivity level 3 (168 hours)

Mounting: Surface mount

Reference: External reference required

Series: No specific series

Base Product Number: AD7761

Inventory: 1601 pcs available, new original stock

Device Structure

Sigma-delta ADC architecture

Eight input channels accepting differential signals

64-pin LQFP package with 10x10mm foot-print

Surface-mount design for PCB integration

No internal reference, requires external reference connection

Integrated SPI interface for digital data output

Performance Characteristics

High data precision (16 bits)

Fast sampling rate suitable for high-speed applications

Eight simultaneous sampling converters

Low distortion and noise due to sigma-delta technology

Supports wide range of analog supply voltages

Operates reliably in industrial environments (-40 to +105°C)

Excellent channel-to-channel matching

External reference allows flexible precision adjustment

Application Environments

Multi-channel industrial data acquisition systems

Medical instruments needing high accuracy

Precision measurement equipment

Automated testing applications

Process control and monitoring

Scientific research instrumentation

Any system where simultaneous multi-channel analog conversion is needed

Selection Guidelines

Choose if 8 simultaneous differential inputs and high (16-bit) resolution are needed

Check package compatibility with board layout (64-LQFP surface mount)

Verify SPI interface works with your data system

Confirm that external reference circuitry is designed into your project

Ensure industrial temperature range fits your application

Consider product status: Obsolete, plan for last-time buys or alternatives

Usage Considerations

Plan for external reference voltage circuit

Obsolete status means future support may be limited

Stock is limited to 1601 pcs, may require alternate sourcing

Handle/package with care due to moisture sensitivity (MSL 3, 168 hours)

Check SPI compatibility with microcontroller/processor

Review thermal and power requirements for reliability

Surface mount assembly must adhere to LQFP standards

Potential Equivalent/Replacement Models

AD7761 (other variants) may offer similar specifications

AD7761B family if available may provide direct compatibility

AD7768 / AD7762 from Analog Devices could be considered for multi-channel sigma-delta ADC needs

Texas Instruments also offers similar multi-channel sigma-delta ADCs, e.g., ADS1278

If none of the above meet requirements, contact Ariat-Tech sales team for supported alternatives or cross-reference models

No direct drop-in replacement guaranteed—review datasheets for pin compatibility and performance matching

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