Analog Devices Inc. AD7450ARZ

Overview

AD7450ARZ from Analog Devices is a 12-bit, 1 MSPS successive approximation ADC with fully differential analog input, 3 V/5 V single-supply operation, and SPI/QSPI-compatible serial interface - designed for high-accuracy transducer interface and portable instrumentation where low power and wide input bandwidth (20 MHz –3 dB) are critical.

For engineers reviewing the AD7450ARZ datasheet, AD7450ARZ pinout, AD7450ARZ application, or AD7450ARZ equivalent, this page delivers verified specifications including differential input range (±VREF), SINAD (70 dB min at 300 kHz), power-down current (1 µA max), and SOIC-8 package compatibility - all confirmed against Analog Devices' official Rev. A datasheet.

Technical Context

The AD7450ARZ implements a charge-redistribution SAR architecture with dual capacitive DACs and an integrated differential track-and-hold amplifier (T/H) featuring 20 MHz full-power bandwidth and 50 ps aperture jitter. Its conversion timing is fully synchronized to the SCLK falling edge, with no pipeline delay and precise sampling controlled by CS assertion.

It supports flexible reference scaling (100 mV–3.5 V), enabling user-defined common-mode voltage and input span (2×VREF); the two's complement output coding and 16-cycle serial readout (4 leading zeros + 12-bit data) ensure deterministic timing for microprocessor and DSP interfacing under both 3 V (833 kSPS) and 5 V (1 MSPS) supply conditions.

Key Specifications

Pinout & Package

AD7450ARZ is housed in an 8-lead SOIC package (SOIC-8, body width 3.9 mm, JEDEC MS-012). Pin layout is standardized across Analog Devices' AD74xx SAR ADC family and validated per datasheet Rev. A Figure 6 and Pin Function Description.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7451ARZ and ADS7822U, the AD7450ARZ uniquely combines differential input, external VREF scalability, 1 MSPS throughput, and 1 µA shutdown - making it the sole option for high-accuracy, low-power, flexible-range applications in portable and industrial systems.

Availability

AD7450ARZ is available at Aetrix Electronics and suitable for transducer interface, battery-powered instrumentation, and motor control applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for AD7450ARZ 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 design centers worldwide and a 50+ year heritage in precision data conversion.

The AD7450ARZ belongs to Analog Devices' AD74xx SAR ADC product line, engineered specifically for low-power, high-speed, differential-input data acquisition in portable, industrial, and automotive-qualified systems.

FAQ

What is the maximum input frequency supported by the AD7450ARZ before signal degradation occurs?

The AD7450ARZ features a full-power bandwidth of 20 MHz (–3 dB) and maintains 70 dB SINAD up to 300 kHz input frequency with 5 V supply. Its 20 MHz –3 dB point ensures accurate digitization of fast transients, while the 2.5 MHz –0.1 dB point defines the upper limit for high-fidelity applications requiring minimal amplitude error. Performance is validated per datasheet TPC 1 and TPC 3.

Does the AD7450ARZ require an external reference voltage, and what are the valid ranges?

Yes, the AD7450ARZ requires an external reference applied to the VREF pin. Valid ranges are 100 mV–3.5 V when using a 5 V supply and 100 mV–2.2 V with a 3 V supply. The reference directly sets the differential input span (2×VREF) and common-mode voltage center point. Datasheet specifies ±1% tolerance for guaranteed performance at 2.5 V (5 V supply) and 1.25 V (3 V supply).

How does the AD7450ARZ achieve low power consumption at high throughput rates?

The AD7450ARZ achieves low power via adaptive clock management: conversion rate scales directly with SCLK frequency, allowing dynamic power reduction during lower-throughput operation. At 1 MSPS (5 V), it consumes 9 mW max; at 833 kSPS (3 V), just 3.75 mW max. Its dedicated 1 µA power-down mode further minimizes idle current - all confirmed in the Power Requirements section of the Rev. A datasheet.

Is the AD7450ARZ pin-compatible with other members of the AD74xx family?

The AD7450ARZ shares the same 8-lead SOIC package and pinout with AD7451ARZ and AD7452ARZ, enabling drop-in replacement where functional requirements align. However, AD7451ARZ integrates an internal 2.5 V reference and lacks VREF flexibility, while AD7452ARZ supports 2.7 V–5.25 V supplies but has different timing specs. Always verify reference, power, and timing compatibility before substitution.

What is the significance of the four leading zeros in the AD7450ARZ serial output format?

The AD7450ARZ outputs a 16-bit word comprising four leading zeros followed by the 12-bit two's complement result, MSB first. This fixed-length framing simplifies FPGA and microcontroller firmware design by ensuring consistent bit alignment and eliminating byte-boundary ambiguity during SPI reads. The format is explicitly defined in the Serial Interface Timing Diagram (Figure 1) and Functional Block Diagram sections of the datasheet.