Analog Devices Inc. AD7450BRZ

Overview

AD7450BRZ from Analog Devices is a 12-bit, 1 MSPS successive approximation ADC with fully differential analog input, SPI/QSPI/MICROWIRE-compatible serial interface, and operation on single 3 V or 5 V supply. It delivers 70 dB SINAD at 300 kHz input frequency, supports external reference from 100 mV to 3.5 V, and achieves 3.75 mW max power at 833 kSPS (3 V) or 9 mW max at 1 MSPS (5 V), targeting high-accuracy transducer and motor control signal acquisition.

For engineers reviewing the AD7450BRZ datasheet, AD7450BRZ pinout, AD7450BRZ application, or AD7450BRZ equivalent, this page provides verified technical context, real-world design meaning of key specs, validated SOIC-8 pin functions, confirmed alternative parts with documented functional differences, and supply-chain support for industrial data acquisition and battery-powered instrumentation designs.

Technical Context

The AD7450BRZ implements a charge-redistribution SAR architecture with dual capacitive DACs and an integrated differential track-and-hold amplifier-enabling no pipeline delay, 20 MHz full-power bandwidth, and 50 ps aperture jitter. Its conversion timing is directly controlled by SCLK edge rate, allowing throughput scaling from 100 kSPS to 1 MSPS via clock speed adjustment.

It features true differential input with user-configurable common-mode voltage (set externally, dependent on VREF), two's complement output coding, and flexible power management including full power-down mode drawing ≤1 µA. Reference voltage (applied to VREF pin) sets both full-scale span (±VREF differential) and input common-mode range per supply rail constraints.

Key Specifications

Pinout & Package

AD7450BRZ is housed in an 8-lead SOIC package (SOIC-8, body width 3.9 mm), RoHS-compliant, with standard JEDEC MS-012AC footprint and 1.27 mm pitch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit SAR ADC applications.

Compared with AD7451BRZ and ADS7822U, the AD7450BRZ uniquely balances 1 MSPS speed, dual 3 V/5 V supply flexibility, and true differential input - making it the only option among the three that supports high-accuracy, low-noise acquisition across both battery and line-powered industrial platforms without layout or reference redesign.

Availability

AD7450BRZ is available at Aetrix Electronics and suitable for transducer interface, battery-powered instrumentation, and motor control applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for industrial OEMs.

Supply support for AD7450BRZ 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, with decades of expertise in precision data conversion and signal conditioning.

The AD7450BRZ belongs to Analog Devices' high-speed, low-power SAR ADC product line, designed specifically for demanding industrial and instrumentation applications where accuracy, speed, and power efficiency must coexist in compact, single-supply solutions.

FAQ

What is the maximum input frequency the AD7450BRZ can accurately digitize?

The AD7450BRZ features a 20 MHz full-power bandwidth (–3 dB point), meaning it can accurately capture input signals up to 20 MHz without significant amplitude loss. At 300 kHz input frequency, it maintains 70 dB SINAD under 5 V supply conditions, confirming high-fidelity performance well within its usable Nyquist range for 1 MSPS sampling.

Does the AD7450BRZ require an external reference voltage?

Yes, the AD7450BRZ requires an external reference voltage applied to the VREF pin. It supports 100 mV to 3.5 V (with 5 V supply) or 100 mV to 2.2 V (with 3 V supply). The reference sets both the full-scale differential input range (±VREF) and influences the allowable common-mode voltage range, so proper decoupling with ≥0.1 µF capacitor is mandatory for stability.

Is the AD7450BRZ pin-compatible with other members of the AD745x family?

The AD7450BRZ shares identical SOIC-8 pinout and function mapping with AD7451BRZ and AD7452BRZ, including VREF, VIN+, VIN–, GND, CS, SDATA, SCLK, and VDD assignments. However, AD7451BRZ operates only at 5 V and offers higher 1.25 MSPS throughput, while AD7452BRZ adds internal reference - so electrical compatibility requires verification of supply and reference configuration per device.

What is the power consumption of the AD7450BRZ during active conversion?

At 1 MSPS with 5 V supply, the AD7450BRZ consumes ≤9 mW (1.8 mA typical). At 833 kSPS with 3 V supply, it consumes ≤3.75 mW (1.25 mA typical). Power scales linearly with throughput due to SCLK-driven conversion timing, and full power-down mode draws ≤1 µA - enabling aggressive duty-cycling in energy-constrained applications.

How does the differential input structure improve noise immunity in the AD7450BRZ?

The AD7450BRZ's fully differential input rejects common-mode noise - such as EMI from switching power supplies or motor drives - with up to 90 dB CMRR at 10 kHz. By accepting complementary signals on VIN+ and VIN–, it cancels interference equally coupled to both paths, preserving signal integrity without requiring additional external filtering or matched PCB routing beyond basic symmetry.