Analog Devices Inc. AD7893AR-5REEL7

Overview

AD7893AR-5REEL7 from Analog Devices is a 12-bit, serial-output successive-approximation ADC with 6 µs conversion time, single +5 V supply operation, and integrated track/hold amplifier. It supports 0 V to +5 V unipolar input range, delivers 70 dB SNR at 10 kHz, and uses straight binary coding - designed for compact data acquisition in industrial sensor interfaces and portable instrumentation.

For engineers reviewing the AD7893AR-5REEL7 datasheet, AD7893AR-5REEL7 pinout, AD7893AR-5REEL7 application, or AD7893AR-5REEL7 equivalent, this page provides verified technical context, real-world timing constraints (e.g., 600 ns read-to-CONVST setup), package-specific SOIC-8 footprint details, and validated alternative options for 12-bit serial ADC replacement.

Technical Context

The AD7893AR-5REEL7 implements a laser-trimmed internal clock driving a 12-bit R-2R ladder SAR core, with on-chip track/hold acquiring to ±1/2 LSB in ≤1.5 µs. Its analog front-end scales 0 V to +5 V inputs via internal resistive network (R1 = R3 = 5 kΩ), delivering 1.22 mV/LSB resolution with buffered 2.5 V reference input.

Timing is edge-triggered: conversion starts on rising CONVST, outputs 16-bit serial data (4 leading zeros + 12-bit result) synchronized to SCLK rising edges, with data valid on falling SCLK edges. No BUSY or EOC signal is provided - system timing must enforce 600 ns minimum gap between SDATA read completion and next CONVST rising edge.

Key Specifications

Pinout & Package

AD7893AR-5REEL7 is housed in an 8-pin SOIC (SO-8) package, 3.9 mm × 4.9 mm body, 1.27 mm pitch, RoHS-compliant lead finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7893BR-5, AD7893AR-5REEL7 trades 0.5 LSB linearity for lower cost and identical timing/package compatibility; versus ADS7822U, it offers smaller footprint and lower power but requires stricter software-controlled timing due to lack of BUSY signal.

Availability

AD7893AR-5REEL7 is available at Aetrix Electronics and suitable for industrial process monitoring, portable data loggers, motor control feedback, and medical instrumentation requiring stable component supply across long production lifecycles.

Supply support for AD7893AR-5REEL7 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, founded in 1965 and headquartered in Wilmington, MA.

The AD7893 product line delivers compact, single-supply 12-bit serial ADCs optimized for space-constrained, low-power data acquisition in industrial, instrumentation, and embedded control systems.

FAQ

What is the maximum recommended serial clock frequency for AD7893AR-5REEL7?

The AD7893AR-5REEL7 supports a maximum SCLK frequency of 8.33 MHz, as specified in the Timing Characteristics table. At this rate, the 16-bit serial read completes in 1.92 µs. Exceeding this frequency risks setup/hold violations on SDATA, leading to corrupted LSBs or invalid output frames. System designs must also ensure SCLK returns low after transmission to avoid unintended shift register retriggering.

Does AD7893AR-5REEL7 require an external reference voltage?

Yes, AD7893AR-5REEL7 requires an external 2.5 V reference applied to the REF IN pin, with tolerance of ±5% (2.375 V to 2.625 V). The part includes an on-chip buffer, drawing ≤2 µA, but does not generate its own reference. Precision sources like the AD780 or AD680 are recommended to maintain specified full-scale accuracy and minimize gain error.

Can AD7893AR-5REEL7 interface directly with a 3.3 V microcontroller?

No - AD7893AR-5REEL7 operates exclusively from a +5 V supply and produces CMOS-level outputs referenced to VDD (4.0 V VOH min, 0.4 V VOL max). Direct connection to 3.3 V logic risks overvoltage damage to the MCU inputs. Level-shifting circuitry (e.g., TXB0104 translator or resistor-divider + Schmitt trigger) is required for safe interoperability.

What is the purpose of the four leading zeros in AD7893AR-5REEL7's serial output format?

The AD7893AR-5REEL7 outputs 16 clock cycles per conversion: the first four bits are always zero, followed by the 12-bit straight binary result (MSB first). This fixed-length framing ensures consistent timing for microcontroller SPI peripherals that expect 16-bit words, simplifies byte alignment in firmware, and prevents misreads caused by variable-length data streams.

How does the track/hold acquisition time affect system throughput in AD7893AR-5REEL7 designs?

The AD7893AR-5REEL7's track/hold acquisition time is ≤1.5 µs - the minimum interval needed after conversion ends (or after a step input change) before initiating the next CONVST pulse. To achieve full 117 kHz throughput, the system must schedule CONVST edges with ≥600 ns gap after SDATA read completion and ≥1.5 µs after prior conversion end, enforcing a total minimum cycle time of 8.52 µs.