Analog Devices Inc. AD7893ARZ-3REEL

Overview

AD7893ARZ-3REEL from Analog Devices is a 12-bit, serial-output analog-to-digital converter (ADC) with 6 µs conversion time, on-chip track/hold amplifier, and ±2.5 V input range. It operates from a single +5 V supply, consumes 25 mW typical, and interfaces via high-speed two-wire serial interface (SCLK/SDATA). It is used in precision data acquisition systems requiring compact size and low power, such as portable instrumentation and industrial sensor interfaces.

For engineers reviewing the AD7893ARZ-3REEL datasheet, AD7893ARZ-3REEL pinout, AD7893ARZ-3REEL application, or AD7893ARZ-3REEL equivalent, key selection criteria include its 12-bit resolution, ±2.5 V bipolar input range, 6 µs conversion time, SOIC-8 package, and compatibility with microcontrollers via synchronous serial interface without external timing components.

Technical Context

The AD7893ARZ-3REEL implements a successive-approximation ADC core with an R-2R ladder DAC, integrated laser-trimmed internal clock oscillator, and buffered on-chip track/hold amplifier. Its analog input stage uses resistor scaling to support ±2.5 V full-scale range with 4 kΩ minimum input resistance.

It features a 16-bit serial output format (four leading zeros + 12-bit twos-complement data), edge-triggered CONVST control, and SCLK-synchronized SDATA valid on falling edge. Timing requires 600 ns minimum gap between read completion and next CONVST rising edge for full-spec performance at up to 117 kHz throughput.

Key Specifications

Pinout & Package

AD7893ARZ-3REEL is housed in an 8-pin SOIC (SO-8) package, 3.9 mm × 4.9 mm body, 1.27 mm pitch, RoHS-compliant, tape-and-reel format (REEL).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7893BRZ-3, AD7893ARZ-3REEL trades 0.5 LSB linearity for lower cost and broader availability; compared with ADS7822U, it integrates track/hold and uses simpler two-wire timing but lacks supply voltage flexibility and requires strict CONVST/SCLK coordination.

Availability

AD7893ARZ-3REEL is available at Aetrix Electronics and suitable for industrial process monitoring, portable test equipment, medical vital sign acquisition, and automated calibration systems requiring stable component supply, long-term obsolescence management, and traceable sourcing.

Supply support for AD7893ARZ-3REEL 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 AD7893 product line delivers compact, single-supply, serial-output ADCs optimized for space-constrained, low-power data acquisition in industrial, medical, and instrumentation applications.

FAQ

What is the input voltage range supported by the AD7893ARZ-3REEL?

The AD7893ARZ-3REEL supports a bipolar analog input range of ±2.5 V. This is fixed for the -3 variant and is implemented using on-chip resistor scaling with 4 kΩ minimum input resistance. The input connects directly to the integrated track/hold amplifier, and output coding is twos-complement to represent negative and positive values natively. Operation requires a +2.5 V reference applied to the REF IN pin.

Does the AD7893ARZ-3REEL require an external clock source?

No, the AD7893ARZ-3REEL does not require an external clock for conversion timing. It contains a laser-trimmed internal oscillator that generates the 6 µs conversion cycle autonomously. However, an external serial clock (SCLK) is required to read data - this clock controls the serial interface timing and can run up to 8.33 MHz. The internal clock eliminates timing jitter concerns associated with external sources while preserving flexible host-controlled data retrieval.

How is data formatted and read from the AD7893ARZ-3REEL?

Data from the AD7893ARZ-3REEL is output as a 16-bit serial frame: four leading zero bits followed by 12 bits of twos-complement conversion result (MSB first). The SDATA line is valid on the falling edge of each SCLK pulse. After the 16th falling SCLK edge, SDATA enters high-impedance (three-state) mode. Reading must be completed before the next CONVST rising edge, with ≥600 ns gap to maintain full-spec performance. The AD7893ARZ-3REEL does not provide a BUSY or DRDY status signal.

What are the power supply requirements for the AD7893ARZ-3REEL?

The AD7893ARZ-3REEL operates from a single +5 V supply (VDD) with ±5% tolerance. Typical current draw is 5 mA, resulting in 25 mW typical power dissipation. AGND and DGND must be connected to separate ground planes or star-point grounded to minimize noise coupling. A 0.1 µF ceramic decoupling capacitor is required between VDD and AGND, placed as close as possible to pins 8 and 3. No negative or auxiliary supplies are needed.

Can the AD7893ARZ-3REEL be used with a 3.3 V microcontroller interface?

Yes, the AD7893ARZ-3REEL's digital interface is compatible with 3.3 V logic systems when properly level-shifted. Its SCLK and CONVST inputs accept VIH ≥ 2.4 V and VIL ≤ 0.8 V at VDD = 5 V, meeting 3.3 V CMOS thresholds. SDATA output swings from 0.4 V to 4.0 V, so a series resistor or dedicated level shifter is recommended to avoid overstressing 3.3 V inputs. DGND must be tied to the microcontroller's digital ground, and timing margins (e.g., t5 bus relinquish time) remain valid under these conditions.