Analog Devices Inc. AD7476ABRM-REEL7

Overview

AD7476ABRM-REEL7 from Analog Devices is a 12-bit, single-channel, successive-approximation analog-to-digital converter (ADC) in a 6-lead SC70 package, operating from 2.35 V to 5.25 V supply and delivering 1 MSPS throughput with 71 dB SNR at 100 kHz input. It features no pipeline delay, SPI/QSPI/MICROWIRE/DSP-compatible serial interface, and internal VDD-referenced conversion enabling 0 V to VDD analog input range. It is used in portable medical instruments requiring high-speed, low-power digitization of sensor signals.

For engineers reviewing the AD7476ABRM-REEL7 datasheet, AD7476ABRM-REEL7 pinout, AD7476ABRM-REEL7 application, or AD7476ABRM-REEL7 equivalent, this page provides verified technical context, exact pin functions, real-world use-value metrics (e.g., 250 ns track-and-hold acquisition time, ±1.5 LSB INL), and validated alternative options for battery-powered, space-constrained signal acquisition designs.

Technical Context

The AD7476ABRM-REEL7 implements a standard successive-approximation register (SAR) architecture with integrated track-and-hold amplifier, sampling on the falling edge of CS and initiating conversion simultaneously. Its conversion timing is fully synchronous to SCLK, requiring exactly 16 clock cycles per conversion with no latency or pipelining.

It uses an internal reference derived from VDD, eliminating external reference components and fixing the full-scale input range to 0 V to VDD. Digital interface logic levels are compatible across 2.35 V–5.25 V operation, with guaranteed VINH ≥ 1.8 V at minimum supply and VOL ≤ 0.4 V at ISINK = 200 μA.

Key Specifications

Pinout & Package

AD7476ABRM-REEL7 is housed in a 6-lead SC70 package (JEDEC MO-203AA), measuring 2.0 mm × 1.25 mm × 0.9 mm, optimized for ultra-compact PCB layouts in portable electronics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822UID and MAX1116EKA+T, AD7476ABRM-REEL7 uniquely combines 1 MSPS, 6-lead SC70 packaging, VDD-referenced operation, and –40°C to +85°C B-grade qualification - making it the only option meeting all three requirements for next-generation portable medical and test equipment.

Availability

AD7476ABRM-REEL7 is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, optical sensor interfaces, and industrial handheld testers requiring stable component supply across extended production lifecycles.

Supply support for AD7476ABRM-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The AD7476A series belongs to Analog Devices' precision SAR ADC product line, engineered specifically for space- and power-constrained applications demanding high speed, low noise, and minimal external components - such as portable diagnostics and IoT edge sensors.

FAQ

What is the maximum sampling rate supported by the AD7476ABRM-REEL7?

The AD7476ABRM-REEL7 supports a maximum throughput rate of 1 MSPS, achieved with a 20 MHz SCLK and 16 serial clock cycles per conversion. This rate is guaranteed across its full operating temperature range (–40°C to +85°C) and supply voltage range (2.35 V to 5.25 V). At lower SCLK frequencies, throughput scales linearly - e.g., 10 MHz SCLK yields 500 kSPS - enabling flexible power-throughput trade-offs in battery-operated systems.

Does the AD7476ABRM-REEL7 require an external voltage reference?

No, the AD7476ABRM-REEL7 uses an internal reference derived from the VDD supply, setting the full-scale analog input range to 0 V to VDD. This eliminates the need for external reference components, reduces system cost and board area, and simplifies layout. However, VDD must be well-regulated and low-noise, especially for high-SNR applications, as reference noise directly impacts ADC performance.

What is the function of the CS pin on the AD7476ABRM-REEL7?

The CS (Chip Select) pin on the AD7476ABRM-REEL7 serves two synchronized functions: it triggers the start of conversion on its falling edge and frames the serial data transfer. Sampling occurs at the same instant, and the 16-bit serial data stream (four leading zeros + 12 data bits) begins output on SDATA after the next SCLK falling edge. CS must remain low for the full 16-SCLK period to ensure complete data readout.

Is the AD7476ABRM-REEL7 compatible with standard SPI interfaces?

Yes, the AD7476ABRM-REEL7 is fully compatible with SPI, QSPI, MICROWIRE, and DSP serial interfaces. It uses a standard 3-wire interface (CS, SCLK, SDATA) with MSB-first, SCLK-falling-edge data capture, and no requirement for MOSI. Its timing parameters - including t2 (CS-to-SCLK setup), t4 (data access), and t7 (SCLK-to-data hold) - meet common microcontroller SPI peripheral specifications across 2.35 V–5.25 V operation.

What package type is used for the AD7476ABRM-REEL7?

The AD7476ABRM-REEL7 is supplied in a 6-lead SC70 package (JEDEC MO-203AA), measuring 2.0 mm × 1.25 mm × 0.9 mm. This ultra-small outline package is tape-and-reel packaged (REEL7 denotes 7-inch reel), optimized for automated pick-and-place assembly and high-density PCB layouts in portable and wearable electronics.