Analog Devices Inc. AD7264BCPZ

Overview

AD7264BCPZ from Analog Devices is a dual-channel, 14-bit, simultaneous-sampling SAR ADC with integrated PGA (×1 to ×128), four on-chip comparators, and internal 2.5 V reference. It operates from a single 5 V supply, delivers 1 MSPS per ADC, supports true differential analog inputs, and targets precision sensor signal acquisition in motor control feedback loops.

For engineers reviewing the AD7264BCPZ datasheet, AD7264BCPZ pinout, AD7264BCPZ application, or AD7264BCPZ equivalent, key selection considerations include simultaneous dual-channel sampling rate, programmable gain amplifier range, comparator propagation delay matching, SNR at gain = 2 (78 dB typical), and LFCSP-48 thermal performance (θJA = 30°C/W).

Technical Context

The AD7264BCPZ integrates two independent SAR ADCs sharing a common clock domain, enabling true simultaneous sampling of VA± and VB± with no inter-channel skew. Each channel includes a fully differential input stage followed by a digitally programmable PGA with 14 discrete gain settings (×1–×128) and calibrated offset/gain compensation registers.

Four dedicated comparators are partitioned into two low-power pairs (A/B) and two high-speed pairs (C/D), each with separate supply domains (CA_CBVCC/CC_CDVCC) and ground references (CA_CB_GND/CC_CD_GND). The device uses a 2.5 V internal reference (±5 mV tolerance, 20 ppm/°C drift) that can be disabled via REFSEL for external reference use.

Key Specifications

Pinout & Package

The AD7264BCPZ is housed in a 48-lead LFCSP package (7 mm × 7 mm × 0.85 mm) with exposed thermal pad requiring solder connection to PCB ground for optimal thermal dissipation (θJC = 3°C/W) and noise immunity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7262BCPZ, AD7264BCPZ adds 2 bits of resolution, 4 comparators, and extended PGA range-critical for motor control. Compared with ADS8684IPWR, AD7264BCPZ offers 2× throughput and true simultaneous sampling but trades off 2 bits of resolution and uses a larger package.

Availability

AD7264BCPZ is available at Aetrix Electronics and suitable for motor control position feedback, industrial sensor signal conditioning, power quality monitoring, and multi-channel data acquisition requiring stable component supply and long-term production continuity.

Supply support for AD7264BCPZ 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, headquartered in Norwood, MA.

The AD7264BCPZ belongs to Analog Devices' precision SAR ADC product line, engineered specifically for real-time, multi-channel analog acquisition in motion control, industrial automation, and energy systems where simultaneous sampling and on-chip signal conditioning are essential.

FAQ

What is the maximum guaranteed sampling rate for AD7264BCPZ?

The AD7264BCPZ guarantees a throughput rate of 1 MSPS per ADC channel under all operating conditions (−40°C to +105°C, AVCC = 4.75 V to 5.25 V). This is achieved with a minimum SCLK frequency of 200 kHz and maximum of 34 MHz; operation above 34 MHz is functional at 25°C but not specified for full performance compliance. The conversion time is fixed at 19 × tSCLK, ensuring deterministic timing critical for motor control loop synchronization.

Does AD7264BCPZ support true simultaneous sampling across both ADC channels?

Yes, AD7264BCPZ implements true simultaneous sampling using two independent track-and-hold circuits and SAR cores, eliminating inter-channel skew. Both VA± and VB± inputs are sampled at the exact same instant upon CS assertion, and conversion results are available simultaneously on DOUTA and DOUTB. This architecture ensures phase coherence required for vector control algorithms and eliminates software interpolation artifacts inherent in multiplexed dual-channel ADCs.

How does the PGA in AD7264BCPZ improve dynamic range for low-level sensor signals?

The AD7264BCPZ PGA provides 14 programmable gain settings (×1 to ×128) that amplify small analog inputs before digitization, effectively extending usable dynamic range without sacrificing resolution. For example, a 10 mVpp resolver signal amplified ×64 yields ~640 mVpp at the ADC input-occupying 26% of full-scale range-while maintaining 14-bit quantization granularity. Combined with system gain calibration registers, the PGA enables end-to-end linearity correction across the entire signal chain.

Can AD7264BCPZ operate with an external reference instead of the internal 2.5 V reference?

Yes, AD7264BCPZ supports external reference operation via the REFSEL pin: tying REFSEL to GND disables the internal 2.5 V reference and enables external reference injection through VREFA and/or VREFB pins. External references must be stable, low-noise, and capable of driving ≥1 µA load. The internal reference remains available as a buffered 2.5 V source on VREFA/VREFB when enabled, allowing it to serve as a system-wide reference for other components.

What are the power consumption characteristics of AD7264BCPZ in normal and shutdown modes?

In ADC normal mode at AVCC = 5.25 V and fS = 1 MSPS, AD7264BCPZ draws 23–33.3 mA (120–175 mW). In shutdown mode-with ADCs and comparators powered down-it consumes only 0.5–1 µA (2.625–5.25 µW). Separate comparator supply domains (CA_CBVCC/CC_CDVCC) allow selective powering of A/B (low-power) or C/D (high-speed) comparators to further optimize system-level power budget without affecting ADC operation.