Analog Devices Inc. AD7273BRMZ

Overview

AD7273BRMZ from Analog Devices is a 10-bit, 3.45 MSPS successive approximation ADC in an 8-lead TSOT package, operating from a single 2.35 V to 3.6 V supply. It features 74 MHz full-power bandwidth, 61 dB SINAD at 1 MHz input, ±0.5 LSB INL, and 9.6 mW typical power dissipation at 3 V - optimized for high-speed data acquisition in portable instrumentation and sensor interfaces.

For engineers reviewing the AD7273BRMZ datasheet, AD7273BRMZ pinout, AD7273BRMZ application, or AD7273BRMZ equivalent, key selection criteria include its 10-bit resolution with no missing codes, external reference flexibility (1.4 V to VDD), SPI/QSPI/MICROWIRE-compatible serial interface, and −40°C to +125°C operation - all critical for battery-powered, space-constrained signal chain designs.

Technical Context

The AD7273BRMZ implements a charge redistribution SAR architecture with on-chip track-and-hold, enabling precise sampling of input frequencies up to 74 MHz (−3 dB) and 10 MHz (−0.1 dB). Conversion is initiated by the falling edge of CS and clocked by SCLK, with no pipeline delay and deterministic 250 ns max conversion time (12 SCLK cycles at 48 MHz).

It uses a single-supply analog front end referenced to an externally applied VREF (1.4 V to VDD), with separate AGND and DGND pins requiring ≤0.3 V potential difference. Power management includes three modes: normal (3.2 mA typ), partial power-down (34 μA typ), and full power-down (0.1 μA typ), supporting dynamic throughput scaling.

Key Specifications

Pinout & Package

AD7273BRMZ is housed in an 8-lead TSOT (Thin Small Outline Transistor) package, 3 mm × 3 mm × 0.8 mm, with exposed pad for thermal enhancement and standard JEDEC moisture sensitivity level (MSL) 1 handling.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7273BRMZ, AD7274BRMZ delivers 2 extra bits and 7 dB higher SINAD but at 15% lower throughput and higher power; ADS7822U offers pin-compatible 12-bit resolution at lower speed and voltage, requiring layout changes and sacrificing high-frequency performance.

Availability

AD7273BRMZ is available at Aetrix Electronics and suitable for portable instrumentation, motor phase sensing, wireless sensor node front ends, and automotive battery monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD7273BRMZ 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 ISO 9001-certified manufacturing.

The AD7273BRMZ belongs to Analog Devices' high-speed, low-power SAR ADC product line, engineered for compact, battery-operated, and thermally demanding applications where precision, speed, and supply flexibility are co-prioritized.

FAQ

What is the maximum sampling rate supported by the AD7273BRMZ?

The AD7273BRMZ achieves a maximum throughput rate of 3.45 MSPS under specified conditions (VDD = 3 V, fSCLK = 48 MHz). This rate is determined by the serial clock frequency and fixed 12-cycle conversion timing. At lower SCLK frequencies, throughput scales linearly - for example, 24 MHz yields ~1.7 MSPS. The AD7273BRMZ does not support oversampling or decimation modes; its rated speed reflects native SAR conversion performance.

Does the AD7273BRMZ require an external reference, and what voltage range is supported?

Yes, the AD7273BRMZ requires an external reference applied to the VREF pin. It accepts reference voltages from 1.4 V up to the VDD supply voltage (2.35 V to 3.6 V), enabling direct use of regulated system rails or precision references. A 10 µF capacitor must be placed between VREF and AGND for stability. The analog input range is strictly 0 V to VREF, and exceeding this range may cause erroneous codes or damage.

How does the power-down mode operate on the AD7273BRMZ?

The AD7273BRMZ supports three power states: normal (3.2 mA typ), partial power-down (34 µA typ), and full power-down (0.1 µA typ at −40°C to +85°C). Full power-down is entered by holding CS high while SCLK is inactive; exit requires CS low followed by SCLK activity, with 1 µs max power-up time. This mode eliminates dynamic current draw and is ideal for duty-cycled sensor acquisition in battery-powered devices.

Is the AD7273BRMZ pin-compatible with the AD7274BRMZ?

Yes, the AD7273BRMZ and AD7274BRMZ share identical 8-lead TSOT pinouts, electrical interfaces, supply requirements, and timing specifications. They differ only in resolution (10-bit vs. 12-bit), dynamic performance (61 dB vs. 68 dB SINAD), and conversion time (250 ns vs. 291 ns). This allows drop-in replacement in existing layouts when higher resolution is needed, provided firmware handles the extended data word length.

What serial interface protocols does the AD7273BRMZ support?

The AD7273BRMZ supports SPI®, QSPI™, MICROWIRE™, and generic DSP-compatible serial interfaces. It uses a 3-wire configuration (CS, SCLK, SDATA) with MSB-first transmission, two leading zeros, 10 data bits, and four trailing zeros. The interface operates with standard CMOS logic levels and tolerates SCLK frequencies from 500 kHz to 48 MHz, making it interoperable with most microcontrollers without level shifters or protocol adapters.