Analog Devices Inc. AD7452BRT-R2

Overview

AD7452BRT-R2 from Analog Devices is a 12-bit, successive approximation (SAR) analog-to-digital converter with fully differential input, 555 kSPS maximum throughput, 70 dB SINAD at 100 kHz, and operation from single 3 V or 5 V supply in an 8-lead SOT-23 package - used in high-accuracy transducer interface and portable instrumentation.

For engineers reviewing the AD7452BRT-R2 datasheet, AD7452BRT-R2 pinout, AD7452BRT-R2 application, or AD7452BRT-R2 equivalent, key selection considerations include differential input bandwidth (20 MHz full-power), low power consumption (3.3 mW max at 3 V/555 kSPS), no pipeline delay, SPI/QSPI/MICROWIRE-compatible serial interface, and external reference flexibility (100 mV to 3.5 V).

Technical Context

The AD7452BRT-R2 implements a SAR architecture with dual capacitive DACs and a differential track-and-hold amplifier supporting up to 3.5 MHz analog input frequencies. Conversion is initiated on the falling edge of CS, with sampling synchronized to that edge and no pipeline latency.

It uses an external reference applied to VREF (100 mV–3.5 V), enabling user-defined common-mode voltage and full-scale span of 2 × VREF. Serial data output is twos complement, MSB-first, with four leading zeros, and timing is fully controlled by SCLK - allowing throughput scaling from idle to 555 kSPS via clock rate adjustment.

Key Specifications

Pinout & Package

AD7452BRT-R2 is housed in an 8-lead SOT-23 package (2.9 mm × 1.6 mm × 1.1 mm), optimized for space-constrained PCB layouts and compatible with standard reflow processes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7452BRT-R2, AD7451ARTZ-REEL7 trades 2 bits of resolution for lower power and cost, while ADS7822U sacrifices differential capability and speed for SOIC compatibility - neither offers the combination of 12-bit differential performance, 555 kSPS, and SOT-23 footprint found in AD7452BRT-R2.

Availability

AD7452BRT-R2 is available at Aetrix Electronics and suitable for transducer interface, battery-powered systems, and portable instrumentation requiring stable component supply, long-term manufacturability, and guaranteed traceable sourcing.

Supply support for AD7452BRT-R2 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 AD7452BRT-R2 belongs to Analog Devices' precision SAR ADC product line, designed specifically for applications demanding high DC accuracy, low power, and differential input flexibility in compact form factors.

FAQ

What is the maximum recommended reference voltage for AD7452BRT-R2 when operating from a 3 V supply?

The AD7452BRT-R2 supports VREF up to 2.2 V when powered from a 3 V supply (2.7 V–3.6 V range). Exceeding this may degrade INL or cause specification violations. For specified performance, Analog Devices recommends 2.0 V (±1%) as the nominal reference voltage under 3 V operation, decoupled with ≥0.1 µF capacitance to GND.

Does AD7452BRT-R2 support single-ended input configurations?

Yes, the AD7452BRT-R2 can operate in single-ended mode by tying VIN– to a fixed common-mode voltage (e.g., VREF/2) and applying the signal to VIN+. However, this forfeits common-mode noise rejection and reduces effective dynamic range by 6 dB compared to differential operation. The datasheet provides layout guidance for stable single-ended use.

What is the minimum quiet time required between serial read completion and the next CS falling edge for AD7452BRT-R2?

The AD7452BRT-R2 requires a minimum quiet time (tQUIET) of 60 ns between the end of a serial read and the next falling edge of CS. This ensures proper three-state release of SDATA and avoids bus contention or metastability during subsequent conversion initiation.

How does the power consumption of AD7452BRT-R2 scale with throughput rate?

AD7452BRT-R2 power scales linearly with SCLK frequency: at 100 kSPS, typical dissipation is 0.64 mW (3 V) or 1.55 mW (5 V); at 555 kSPS, it reaches 3.3 mW (3 V) or 7.25 mW (5 V). Reducing SCLK lowers both conversion rate and active power - enabling dynamic power management in variable-speed systems.

Is AD7452BRT-R2 RoHS compliant and lead-free?

Yes, AD7452BRT-R2 is RoHS compliant and features lead-free (Pb-free) terminations per Analog Devices' standard packaging. The SOT-23 package uses matte tin (Sn) plating over copper leadframe, qualified for standard reflow profiles and compatible with lead-free assembly processes.