Analog Devices Inc. AD7264BSTZ

Overview

AD7264BSTZ 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 delivers 1 MSPS per channel, supports true differential analog inputs, and operates across −40°C to +105°C for industrial motor control feedback and sensor monitoring applications.

For engineers reviewing the AD7264BSTZ datasheet, AD7264BSTZ pinout, AD7264BSTZ application, or AD7264BSTZ equivalent, this page provides verified specifications, validated package mapping (48-lead LQFP), confirmed comparator roles (A/B low-power, C/D fast-propagation), calibrated DC accuracy (±1.5 LSB INL), and real-world timing behavior (19 × tSCLK conversion, 33-clock serial interface).

Technical Context

The AD7264BSTZ integrates two independent SAR ADCs sharing a common clock domain but operating in true simultaneous sampling mode-enabling precise phase-aligned acquisition of dual sensor signals. Each channel features a programmable gain amplifier with 14 discrete gain settings and dedicated analog input pairs (VA±/VB±) referenced to AGND.

Its four comparators are partitioned into two functional groups: Comparators A and B operate at ultra-low quiescent current (3 µA at 3.3 V) for position-sensing duty cycles, while Comparators C and D deliver sub-0.13 µs propagation delay (at 5 V) for high-speed edge detection in encoder pulse counting.

Key Specifications

Pinout & Package

AD7264BSTZ is packaged in a 48-lead LQFP (7 mm × 7 mm, 0.5 mm pitch) with exposed thermal pad. Pin assignments follow standard Analog Devices LQFP layout; all AVCC, AGND, and DGND pins are distributed for optimal power integrity and noise isolation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7264BSTZ, AD7262BCPZ-RL7 trades 2 bits of resolution and comparator functionality for lower power and cost, while ADS8684IPWR offers higher resolution at half the speed and requires external analog support circuitry-making AD7264BSTZ uniquely balanced for dynamic closed-loop industrial control.

Availability

AD7264BSTZ is available at Aetrix Electronics and suitable for industrial motor control, power quality monitoring, condition-based maintenance, and high-reliability sensor data acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD7264BSTZ 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, with R&D centers worldwide focused on precision signal chain innovation.

The AD7264BSTZ belongs to Analog Devices' precision SAR ADC product line, engineered specifically for real-time industrial automation systems requiring simultaneous multi-channel acquisition, on-chip signal conditioning, and robust operation in harsh electromagnetic environments.

FAQ

What is the maximum guaranteed sampling rate for AD7264BSTZ?

The AD7264BSTZ guarantees a throughput rate of 1 MSPS per ADC channel under all specified conditions-including full temperature range (−40°C to +105°C), worst-case supply (AVCC = 4.75 V), and internal reference operation. This is achieved using a 34 MHz SCLK and 19-clock conversion cycle, with timing validated per Table 2 in Rev. E datasheet. The AD7264BSTZ maintains this rate without performance degradation across its entire operating range.

Does AD7264BSTZ support true simultaneous sampling of both channels?

Yes, AD7264BSTZ implements hardware-synchronized track-and-hold circuits for both ADCs, ensuring simultaneous sampling with <1 ns inter-channel aperture jitter. This is confirmed in the Functional Block Diagram (Figure 1) and General Description section, which states "two complete ADC functions allow simultaneous sampling and conversion." The dual DOUTA/DOUTB outputs provide independent, time-aligned results-critical for vector control and phase-sensitive measurements.

How does the PGA gain selection work on AD7264BSTZ?

The AD7264BSTZ supports 14 discrete PGA gain settings (×1, ×2, ×3, ×4, ×6, ×8, ×12, ×16, ×24, ×32, ×48, ×64, ×96, ×128) selected via hardware pins G0–G3. When all four pins are low, PD0/DIN becomes a serial data input for register-based configuration. Gain selection directly affects input bandwidth (e.g., 1.7 MHz at ×2, 1.2 MHz at ×128) and common-mode voltage range-details are in Table 1 and Figure 15 of the datasheet.

Can AD7264BSTZ operate with an external reference?

Yes, AD7264BSTZ supports external reference operation via the REFSEL pin: tie REFSEL high for internal 2.5 V reference, or low to disable it and apply an external reference to VREFA and/or VREFB pins. External reference voltage must be 2.5 V ±5 mV, with ≤20 pF input capacitance and ≤4 Ω output impedance per datasheet Section "REFERENCE INPUT/OUTPUT." The internal reference can be disabled independently per ADC channel.

What are the key differences between the four comparators in AD7264BSTZ?

AD7264BSTZ integrates two comparator pairs with distinct optimization goals: Comparators A and B are optimized for ultra-low power (3 µA at 3.3 V), making them ideal for always-on position sensing in battery-backed systems; Comparators C and D prioritize speed (0.13 µs propagation delay at 5 V), suited for fast edge detection in encoder zero-crossing or fault signaling. All four share 1 GΩ input impedance and 0.5 µV/°C offset drift, but differ in supply domains (CA_CBVCC vs. CC_CDVCC) and output drive strength.