Analog Devices Inc. AD7265BSUZ

Overview

AD7265BSUZ from Analog Devices is a dual 12-bit, 1 MSPS successive approximation ADC with 3-channel multiplexed analog inputs per ADC, differential/single-ended/pseudo-differential input configuration, on-chip 2.5 V reference (±0.2% max at 25°C), and SPI/QSPI/MICROWIRE/DSP-compatible serial interface - used in high-speed industrial data acquisition systems requiring simultaneous sampling of two sensor channels.

For engineers reviewing the AD7265BSUZ datasheet, AD7265BSUZ pinout, AD7265BSUZ application, or AD7265BSUZ equivalent, key selection considerations include simultaneous dual-conversion timing (875 ns at 16 MHz SCLK), channel-to-channel isolation (−88 dB typ), flexible input range selection (0–VREF or 0–2×VREF), and operation across −40°C to +125°C with 32-lead TQFP packaging.

Technical Context

The AD7265BSUZ integrates two independent 12-bit SAR ADCs, each preceded by a 3-channel analog multiplexer and a wide-bandwidth track-and-hold amplifier (33 MHz full-power bandwidth at 5 V). Conversion is initiated on the falling edge of CS, with precise sampling control and no pipeline delay.

It supports three analog input modes per ADC - 12 single-ended, 6 fully differential, or 6 pseudo-differential channels - selected via SGL/DIFF, RANGE, and A2–A0 pins. The device uses straight binary or twos complement output coding and features dual independent serial outputs (DOUTA/DOUTB) for true simultaneous readout.

Key Specifications

Pinout & Package

AD7265BSUZ is packaged in a 32-lead TQFP (SU-32-2) with exposed pad. Pin 1 is located at top-left corner; exposed pad must be connected to DGND/AGND plane using multiple vias for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel SAR ADC applications.

Compared with AD7266BCPZ, AD7265BSUZ trades 1 MSPS lower throughput for 30% lower power at 3 V; compared with ADS8327IPWR, AD7265BSUZ provides integrated dual conversion and reference at the cost of 4-bit resolution reduction - making it optimal for time-critical, multi-channel industrial DAQ where 12-bit fidelity suffices.

Availability

AD7265BSUZ is available at Aetrix Electronics and suitable for industrial automation, automotive battery monitoring, and energy metering applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD7265BSUZ 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The AD7265BSUZ belongs to Analog Devices' precision SAR ADC product line, engineered for high-speed, low-power, multi-channel data acquisition in harsh industrial and automotive environments.

FAQ

What is the maximum sampling rate supported by the AD7265BSUZ?

The AD7265BSUZ supports a maximum throughput rate of 1 MSPS. This is achieved with a 16 MHz SCLK and results in a total conversion time of 875 ns. The device maintains specified dynamic performance (e.g., 70 dB SINAD) at this rate in differential mode, making it suitable for demanding real-time acquisition tasks such as motor control feedback loops and power quality analysis where timing determinism is essential. The AD7265BSUZ does not support oversampling or interpolation to increase effective sample rate.

Does the AD7265BSUZ require an external reference voltage?

No, the AD7265BSUZ includes an accurate on-chip 2.5 V reference with ±0.2% maximum error at 25°C and 20 ppm/°C temperature coefficient. This internal reference is sufficient for most industrial applications. However, the device also supports external reference inputs (100 mV to VDD) via DCAPA and DCAPB pins when higher precision or custom scaling is required. REF SELECT pin controls selection between internal and external reference sources - tying it to DGND enables the internal reference, while a logic high enables external reference mode.

How does the AD7265BSUZ handle simultaneous sampling of two channels?

The AD7265BSUZ achieves true simultaneous sampling using two independent SAR ADC cores, each with its own track-and-hold amplifier and 3-channel multiplexer. When CS falls, both ADCs begin acquisition at the exact same instant, with aperture delay matching of ≤200 ps. Conversion results appear simultaneously on DOUTA and DOUTB after 875 ns (at 16 MHz SCLK), enabling time-aligned measurements critical for vector control, phase difference analysis, and coherent multi-sensor systems - unlike interleaved or multiplexed single-core ADCs which introduce inherent channel skew.

What are the supported analog input configurations for the AD7265BSUZ?

The AD7265BSUZ supports three analog input configurations per ADC: 12 single-ended inputs (VA1–VA6, VB1–VB6), 6 fully differential pairs (e.g., VA1+/VA1−), or 6 pseudo-differential pairs (e.g., VA1+ referenced to VA1− held at fixed voltage). Configuration is controlled by SGL/DIFF (single-ended vs. differential), RANGE (0–VREF vs. 0–2×VREF), and A2–A0 (channel selection) pins. Input ranges scale accordingly: fully differential accepts VCM ± VREF/2, pseudo-differential supports 0–VREF or 0–2×VREF, and single-ended operates from 0 to VREF or 0 to 2×VREF depending on RANGE pin state.

What package type is used for the AD7265BSUZ and what are its thermal characteristics?

The AD7265BSUZ is supplied in a 32-lead TQFP package (SU-32-2), distinct from the LFCSP variant (AD7265BCPZ). Its θJA thermal impedance is 55°C/W, significantly lower than the 108.2°C/W of the LFCSP version, offering superior heat dissipation in airflow-limited industrial enclosures. The exposed pad is absent in TQFP; thermal management relies on standard PCB copper pour under the body. Maximum junction temperature is 150°C, and the device is rated for continuous operation from −40°C to +125°C ambient, validated per JEDEC JESD22-A104 reliability testing.