Analog Devices Inc. AD7766BRUZ

Overview

AD7766BRUZ 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 ±6 ppm typical INL, and operates with 2.5 V analog/digital supplies and 5 V reference in a 16-lead TSSOP package - ideal for USB/PCI-based instrumentation requiring simultaneous ac/dc accuracy.

For engineers reviewing the AD7766BRUZ datasheet, AD7766BRUZ pinout, AD7766BRUZ application, or AD7766BRUZ equivalent, key selection considerations include its 128 kSPS output data rate, on-chip linear-phase FIR filter with ±0.005 dB pass-band ripple, 15 nV/°C zero-error drift, daisy-chain capability via SDI, and synchronization support across multiple devices using SYNC/PD.

Technical Context

The AD7766BRUZ implements an oversampled SAR architecture with a three-stage decimating FIR filter (decimation factor = 8), reducing quantization noise bandwidth while delivering full 24-bit no-missing-codes resolution. Its fully differential analog input structure accepts ±VREF+ differential signals with 22 pF input capacitance and supports common-mode voltages centered at VREF+/2 ±5%.

Digital interface flexibility includes 1.8 V–3.6 V logic-level programmability via VDRIVE, serial 24-bit two's complement MSB-first output on SDO, and configurable timing via MCLK (1.024 MHz nominal) and SCLK. The device enables synchronized multi-ADC systems through the SYNC/PD pin and supports daisy-chaining via SDI/SDO interconnection without external logic.

Key Specifications

Pinout & Package

AD7766BRUZ is housed in a 4.4 mm × 5 mm, 16-lead TSSOP package (RoHS-compliant, lead-free). Pin assignments are validated per Analog Devices Rev. D datasheet Figure 6 and Table 5.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7767 and AD7765, the AD7766BRUZ uniquely delivers verified 24-bit no-missing-codes performance at 128 kSPS with fully integrated reference handling and on-chip filtering - making it optimal for applications demanding both precision and design simplicity without external analog signal conditioning.

Availability

AD7766BRUZ is available at Aetrix Electronics and suitable for vibration analysis systems, portable medical monitors, USB-based lab data loggers, and industrial PCI data acquisition cards requiring stable component supply and long-term production continuity.

Supply support for AD7766BRUZ 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 technologies, serving industrial, automotive, communications, and healthcare markets since 1965.

The AD7766BRUZ belongs to Analog Devices' precision data acquisition portfolio, engineered specifically for applications demanding simultaneous high dynamic range, low power, and dc accuracy - such as portable instrumentation and distributed sensor networks.

FAQ

What is the maximum output data rate supported by the AD7766BRUZ?

The AD7766BRUZ supports a maximum output data rate of 128 kSPS when configured with decimation factor 8 and MCLK = 1.024 MHz. This ODR is fixed for the AD7766 variant (not adjustable like AD7766-1 or AD7766-2); scaling ODR requires changing MCLK frequency linearly, but 128 kSPS represents the highest validated rate with full 24-bit performance and 109.5 dB dynamic range. The AD7766BRUZ datasheet confirms this value in Table 2 and Section "AD7766 Models".

Does the AD7766BRUZ require an external reference voltage?

Yes, the AD7766BRUZ requires an external reference voltage applied to the VREF+ pin (Pin 2). It accepts 2.4 V to 5 V, with 5 V being the nominal value specified for full performance. The device does not include an internal reference; VREF+ directly sets the full-scale differential input range as ±VREF+. Reference stability and low-noise decoupling to REFGND (Pin 3) are critical to achieving ±6 ppm INL and 15 nV/°C zero-drift specs stated in the AD7766BRUZ datasheet.

Can multiple AD7766BRUZ devices be synchronized for coherent sampling?

Yes, the AD7766BRUZ includes a dedicated SYNC/PD pin (Pin 7) that enables hardware synchronization across multiple units. Asserting a common active-low pulse on SYNC/PD aligns internal filter states and sampling clocks, ensuring phase-coherent acquisition across distributed channels. This capability is explicitly documented in the "Power-Down, Reset, and Synchronization" section and timing diagram Figure 5 of the AD7766BRUZ datasheet.

What digital interface options does the AD7766BRUZ support?

The AD7766BRUZ supports a flexible 3-wire SPI-compatible serial interface with SDO, SCLK, and CS pins, plus optional SDI for daisy-chaining. Logic levels are programmable via VDRIVE (Pin 9) from 1.8 V to 3.6 V, allowing direct connection to diverse host processors. Data is output as 24-bit two's complement, MSB-first, with DRDY signaling readiness. All timing parameters - including t8 setup/hold and SCLK min period - are fully specified in Table 3 of the AD7766BRUZ datasheet.

Is the AD7766BRUZ pin-compatible with other members of the AD7766 family?

Yes, the AD7766BRUZ shares identical pinout, package (16-lead TSSOP), and footprint with AD7766-1BRUZ and AD7766-2BRUZ. All variants use the same AVDD, VREF+, VIN+, VIN−, SYNC/PD, SDO, DRDY, SCLK, MCLK, SDI, and CS pin assignments per Figure 6 of the AD7766BRUZ datasheet. Functional differences (ODR, power, DR) are determined by internal decimation settings, not pin configuration - enabling drop-in replacement where performance trade-offs are acceptable.