Analog Devices Inc. AD7450ABRM-REEL7

Overview

AD7450ABRM-REEL7 from Analog Devices is a 12-bit, 1 MSPS successive approximation register (SAR) analog-to-digital converter with fully differential analog inputs, 70 dB SINAD at 100 kHz, ±1 LSB INL max, and operation from single 3 V or 5 V supply. It serves as a high-speed, low-power data acquisition front-end in precision transducer interface and portable instrumentation systems.

For engineers reviewing the AD7450ABRM-REEL7 datasheet, AD7450ABRM-REEL7 pinout, AD7450ABRM-REEL7 application, or AD7450ABRM-REEL7 equivalent, key selection criteria include guaranteed no missing codes to 12 bits, flexible external reference range (100 mV–3.5 V), SPI/QSPI/MICROWIRE-compatible serial interface, and 8-lead SOT-23 package compatibility with space-constrained PCB layouts.

Technical Context

The AD7450ABRM-REEL7 implements a true SAR architecture with no pipeline delay, enabling deterministic conversion timing and precise sampling control via CS falling edge. Its differential track-and-hold amplifier supports input frequencies up to 3.5 MHz and delivers 70 dB minimum SINAD at 100 kHz with 2.5 V reference.

Conversion is clocked by an external SCLK (up to 18 MHz), requiring exactly 16 cycles per sample; power scales linearly with throughput, and full power-down mode draws ≤1 µA. The device accepts externally applied VREF (100 mV–3.5 V), directly setting full-scale span (2 × VREF) and common-mode input range (VCM ± VREF/2).

Key Specifications

Pinout & Package

AD7450ABRM-REEL7 is housed in an 8-lead SOT-23 package (JEDEC MO-178AA), with exposed pad not electrically connected. Pin 1 is marked by a dot; top view orientation matches Figure 5 in Rev. D datasheet.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7450ABRM-REEL7, AD7450ARMZ offers identical performance in a thermally superior but larger package, while ADS7822U trades speed, differential capability, and supply flexibility for lower cost and simpler interface-making it unsuitable for noise-prone or high-throughput use cases.

Availability

AD7450ABRM-REEL7 is available at Aetrix Electronics and suitable for transducer interface, battery-powered systems, and portable instrumentation requiring stable component supply, long-term production continuity, and RoHS-compliant packaging.

Supply support for AD7450ABRM-REEL7 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.

The AD7450A belongs to Analog Devices' precision SAR ADC product line, engineered for high-speed, low-power data acquisition in space- and energy-constrained applications where accuracy, noise immunity, and deterministic timing are essential.

FAQ

What is the maximum sampling rate supported by the AD7450ABRM-REEL7?

The AD7450ABRM-REEL7 supports a maximum throughput rate of 1 MSPS, achieved with an 18 MHz SCLK and 16 clock cycles per conversion. This rate is guaranteed across the full operating temperature range (–40°C to +85°C) and both 3 V and 5 V supply conditions. At lower SCLK frequencies, the throughput scales linearly, enabling flexible power/performance trade-offs in the AD7450ABRM-REEL7 design.

Does the AD7450ABRM-REEL7 require an external reference voltage?

Yes, the AD7450ABRM-REEL7 requires an external reference voltage applied to the VREF pin. It does not include an internal reference. The reference can range from 100 mV to 3.5 V, directly setting the full-scale differential input span (2 × VREF) and common-mode input range. For specified performance, Analog Devices recommends 2.06 V at 3 V supply and 2.55 V at 5 V supply, each with ±1% tolerance. The AD7450ABRM-REEL7 datasheet specifies decoupling with ≥0.1 µF capacitor to GND.

Is the AD7450ABRM-REEL7 compatible with SPI interface standards?

Yes, the AD7450ABRM-REEL7 features a native SPI-compatible serial interface that also supports QSPI™ and MICROWIRE™ protocols. It uses CS (active-low chip select), SCLK (serial clock), and SDATA (serial data output) pins. Data is output MSB-first with four leading zeros, followed by 12 bits of twos-complement result. The interface operates with standard SPI timing and requires no additional level-shifting or protocol translation when interfacing with common microcontrollers or DSPs.

What is the meaning of "no pipeline delay" in the AD7450ABRM-REEL7 specifications?

"No pipeline delay" means the AD7450ABRM-REEL7 uses a successive approximation register (SAR) architecture rather than a pipelined or sigma-delta topology. As a result, the conversion result is available deterministically after exactly 16 SCLK cycles following the CS falling edge-there is no latency from prior conversions affecting current output. This enables precise timing control, eliminates output jitter due to pipeline staging, and ensures consistent sample-to-sample timing critical for synchronous multi-channel acquisition in the AD7450ABRM-REEL7.

Can the AD7450ABRM-REEL7 operate from a 3.3 V supply?

Yes, the AD7450ABRM-REEL7 is fully specified for operation from a 3 V supply (2.7 V to 3.6 V range). At 3 V, it delivers 70 dB minimum SINAD at 100 kHz, ±1 LSB INL, and consumes ≤4 mW at 1 MSPS. The recommended reference voltage is 2.06 V (±1%) for optimal performance. All digital interface levels (VINH = 2.4 V min, VINL = 0.8 V max) are compatible with standard 3.3 V logic families, confirming robust interoperability in 3.3 V system designs using the AD7450ABRM-REEL7.