Analog Devices Inc. AD7893ARZ-5

Overview

AD7893ARZ-5 from Analog Devices is a 12-bit successive-approximation ADC with on-chip track/hold amplifier, serial interface, and single +5 V supply operation. It delivers 6 µs conversion time, 0 V to +5 V unipolar input range, straight binary output coding, and 70 dB SNR at 10 kHz - used in industrial data acquisition systems requiring compact, low-power analog-to-digital conversion.

For engineers reviewing the AD7893ARZ-5 datasheet, AD7893ARZ-5 pinout, AD7893ARZ-5 application, or AD7893ARZ-5 equivalent, key selection factors include its 8-pin SOIC package, 1.5 µs track/hold acquisition time, ±1 LSB relative accuracy, 9 mA max IDD, and compatibility with microcontroller serial interfaces via SCLK/SDATA two-wire protocol.

Technical Context

The AD7893ARZ-5 implements a laser-trimmed internal clock driving a 12-bit R-2R ladder SAR core, with integrated track/hold enabling full-scale sine wave digitization up to 58 kHz. Its analog front-end scales 0 V to +5 V inputs using internal resistive networks (R1 = R3 = 5 kΩ), delivering 1.22 mV/LSB resolution referenced to +2.5 V.

Control logic synchronizes conversion initiation on the rising edge of CONVST, while serial data output (SDATA) provides 16-bit frames - four leading zeros followed by 12 MSB-first straight binary bits - valid on the falling edge of SCLK, with bus relinquish after the 16th SCLK falling edge.

Key Specifications

Pinout & Package

AD7893ARZ-5 is housed in an 8-pin SOIC (SO-8) package with 1.27 mm pitch, 5.0 mm × 4.0 mm body, and gull-wing leads. Pin 1 is marked with a beveled corner or dot; pin numbering follows standard SOIC convention (counterclockwise from top-left).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822U and MAX11131AUT+, the AD7893ARZ-5 uniquely combines 0–5 V input range, integrated track/hold, 6 µs conversion, and SOIC-8 packaging - making it the only drop-in solution for upgrading legacy 5 V data acquisition systems without layout or firmware rework.

Availability

AD7893ARZ-5 is available at Aetrix Electronics and suitable for industrial process monitoring, portable test equipment, motor control feedback, and medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD7893ARZ-5 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 was designed for space-constrained, low-power data acquisition systems requiring integrated track/hold, serial interface, and single-supply operation - targeting industrial, instrumentation, and portable measurement applications.

FAQ

What is the input voltage range supported by the AD7893ARZ-5?

The AD7893ARZ-5 supports a unipolar 0 V to +5 V analog input range, optimized for single-supply systems interfacing with sensors, transmitters, or DACs operating within that rail. This range is fixed per variant and does not require external scaling resistors or configuration pins. The AD7893ARZ-5 uses straight binary output coding aligned to this range, with 1.22 mV per LSB resolution when referenced to +2.5 V.

Does the AD7893ARZ-5 include an on-chip track/hold amplifier?

Yes, the AD7893ARZ-5 integrates a track/hold amplifier that acquires the analog input to 12-bit accuracy in ≤1.5 µs. This eliminates the need for external sample-and-hold circuitry, reducing component count and board area. The track/hold transitions to hold mode on the rising edge of CONVST and returns to track mode 6 µs later, enabling continuous sampling at up to 117 kHz with proper timing discipline.

What serial interface protocol does the AD7893ARZ-5 use?

The AD7893ARZ-5 uses a proprietary two-wire serial interface consisting of SCLK (serial clock input) and SDATA (serial data output). Data is clocked out on the rising edge of SCLK and is valid on the falling edge. Each conversion yields a 16-bit frame: four leading zeros followed by 12 MSB-first straight binary bits. The SDATA line is three-stated after the 16th SCLK falling edge.

What reference voltage is required for the AD7893ARZ-5?

The AD7893ARZ-5 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 reference input is buffered on-chip and draws ≤2 µA. Gain and offset errors scale directly with reference accuracy and stability; recommended sources include the AD780 or AD680 precision references. No internal reference is provided.

Is the AD7893ARZ-5 pin-compatible with other AD7893 variants?

Yes, all AD7893 variants - including AD7893ARZ-2, AD7893ARZ-3, AD7893ARZ-5, and AD7893ARZ-10 - share identical 8-pin SOIC (SO-8) pinouts and electrical signaling. However, input ranges, output coding (straight binary vs. two's complement), and internal scaling networks differ per variant. Swapping variants requires verifying analog input compatibility and firmware handling of output format.