Analog Devices Inc. AD7767BRUZ

Overview

AD7767 from Analog Devices is a 24-bit, oversampled successive approximation register (SAR) analog-to-digital converter optimized for high-precision, low-power data acquisition. It delivers 109.5 dB dynamic range at 128 kSPS, consumes 15 mW, features ±3 ppm typical INL, and operates with 2.5 V analog/digital supplies and 5 V reference - ideal for USB/PCI-based instrumentation requiring simultaneous ac/dc accuracy and low thermal drift.

For engineers reviewing the AD7767 datasheet, AD7767 pinout, AD7767 application, or AD7767 equivalent, key selection considerations include its 128 kSPS output data rate, on-chip linear-phase FIR filter with ±0.005 dB pass-band ripple, differential input structure with 15 nV/°C zero-error drift, and TSSOP-16 package compatibility with vibration analysis and medical acquisition systems.

Technical Context

The AD7767 employs an oversampled SAR architecture with a three-stage decimating FIR filter (decimation factor = 8), achieving 128 kSPS output while spreading quantization noise beyond the signal band. Its fully differential analog input (VIN+, VIN−) interfaces directly to precision sensor front-ends and rejects common-mode interference up to −110 dB at 50 Hz.

Internal clocking uses a fixed 1.024 MHz MCLK to drive sampling; digital interface logic voltage (VDRIVE) is independently configurable from 1.8 V to 3.6 V, enabling seamless integration with mixed-voltage microcontrollers. Synchronization via SYNC/PD pin supports deterministic timing across multi-device acquisition systems.

Key Specifications

Pinout & Package

AD7767 is housed in a 4.4 mm × 5 mm, 16-lead TSSOP package with exposed pad (thermal pad not electrically connected). Pin layout supports compact PCB layout and standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-resolution, low-power SAR ADC applications.

Compared with AD7767-1 and AD7766, the AD7767 uniquely delivers 24-bit resolution at full 128 kSPS with 15 mW power - making it the sole option among these three for applications demanding both maximum throughput and quantum-limited precision in a single TSSOP-16 device.

Availability

AD7767 is available at Aetrix Electronics and suitable for low-power USB data acquisition systems, vibration analysis platforms, and high-precision medical instrumentation requiring stable component supply across production lifecycles.

Supply support for AD7767 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.

The AD7767 belongs to Analog Devices' precision delta-sigma and oversampled SAR ADC product line, engineered specifically for applications demanding simultaneous high resolution, wide dynamic range, low power, and robust dc accuracy in harsh environments.

FAQ

What is the maximum output data rate of the AD7767?

The AD7767 achieves a maximum output data rate of 128 kSPS when configured with a 1.024 MHz main clock (MCLK) and decimation factor of 8. This ODR is fixed for the AD7767 variant and cannot be increased beyond this value without violating specified timing and performance parameters.

Does the AD7767 require an external anti-aliasing filter?

The AD7767's oversampled SAR architecture and integrated FIR filter reduce anti-aliasing requirements significantly. With a −3 dB bandwidth of 0.49×ODR (62.7 kHz at 128 kSPS), a simple RC filter with cutoff ~100 kHz is typically sufficient - eliminating complex active filter stages required by Nyquist-rate ADCs.

Can the AD7767 operate with a 2.5 V reference instead of 5 V?

Yes, the AD7767 supports reference voltages from 2.4 V to 5 V. When using a 2.5 V reference, full-scale differential input range becomes ±2.5 V, and recommended references include the ADR441 or ADR421. Performance metrics such as dynamic range scale proportionally with reference voltage.

How does the SYNC/PD pin function in multi-device synchronization?

The SYNC/PD pin on the AD7767 provides hardware-triggered synchronization: a falling edge resets internal digital filters and aligns conversion start times across multiple AD7767 devices. This ensures phase-coherent sampling in distributed sensor arrays without software coordination overhead.

What is the purpose of the VDRIVE pin on the AD7767?

The VDRIVE pin sets the logic voltage level for all digital I/Os (SDO, SCLK, CS, SDI, DRDY), independent of AVDD/DVDD. Configured between 1.8 V and 3.6 V, it enables direct interfacing with diverse host processors - e.g., 1.8 V FPGA banks or 3.3 V microcontrollers - without external level-shifting circuitry.