Analog Devices Inc. AD7893BRZ-2

Overview

AD7893BRZ-2 from Analog Devices is a 12-bit, serial-output analog-to-digital converter (ADC) with 6 µs conversion time, single +5 V supply operation, and on-chip track/hold amplifier. It accepts 0 V to +2.5 V unipolar input range, delivers straight binary output coding, and achieves 72 dB SNR at 10 kHz input frequency - ideal for precision data acquisition in space-constrained industrial sensor interfaces.

For engineers reviewing the AD7893BRZ-2 datasheet, AD7893BRZ-2 pinout, AD7893BRZ-2 application, or AD7893BRZ-2 equivalent, this page provides verified technical context, validated pin functions, confirmed dynamic and DC specifications, real-world application mappings, and two rigorously cross-checked alternative parts for system-level design continuity.

Technical Context

The AD7893BRZ-2 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 connects directly to the track/hold stage without scaling resistors, supporting only 0 V to +2.5 V unipolar range with ≤500 nA input current.

It uses a two-wire high-speed serial interface: SCLK clocks data out on rising edges, SDATA presents 16-bit frames (4 leading zeros + 12-bit result), and the output is three-stated after the 16th falling SCLK edge. No BUSY or EOC signal is provided - timing coordination relies entirely on CONVST edge control and fixed 6 µs conversion latency.

Key Specifications

Pinout & Package

AD7893BRZ-2 is housed in an 8-pin SOIC (SO-8) package with 1.27 mm pitch, 5.0 mm × 6.2 mm body size, and standard JEDEC MS-012 outline. Pin 1 is marked by a beveled corner or dot; pins are numbered counterclockwise from top-left when viewed from top.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7893ARZ-2, the AD7893BRZ-2 offers superior thermal performance and SMT compatibility; compared with ADS7822U, it delivers lower system-level BOM cost and deterministic acquisition timing - making AD7893BRZ-2 optimal for compact, self-contained analog front-ends where board space and design cycle time are constrained.

Availability

AD7893BRZ-2 is available at Aetrix Electronics and suitable for industrial sensor interfaces, portable data loggers, medical vital sign monitors, and test equipment requiring stable component supply across extended temperature ranges (–40°C to +85°C).

Supply support for AD7893BRZ-2 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, serving industrial, automotive, communications, and healthcare markets since 1965.

The AD7893 product line delivers compact, single-supply, serial-output ADCs optimized for space-constrained, low-power data acquisition systems - emphasizing integration (track/hold + clock + interface), ease of use, and guaranteed DC/dynamic performance across temperature.

FAQ

What is the maximum recommended serial clock (SCLK) frequency for reliable operation of the AD7893BRZ-2?

The AD7893BRZ-2 supports up to 8.33 MHz SCLK frequency under standard operating conditions (VDD = +5 V, TA = +25°C). At this rate, the full 16-bit read cycle completes in 1.92 µs. Timing margins must still respect t4 (SCLK rising edge to data valid delay ≤60 ns) and t5 (bus relinquish time ≥100 ns), so PCB trace lengths and driver strength should be verified per Figure 5 in the AD7893BRZ-2 datasheet.

Does the AD7893BRZ-2 require an external reference voltage, and what are the tolerance requirements?

Yes, the AD7893BRZ-2 requires an external +2.5 V reference applied to the REF IN pin. The datasheet specifies REF IN input voltage range as 2.375 V to 2.625 V (±5%), with input current ≤10 µA max. Reference accuracy directly impacts full-scale error - a ±0.1% reference contributes ~±0.5 LSB gain error. Recommended references include AD780 or ADR421 for stability and low drift.

How does the CONVST signal control conversion timing in the AD7893BRZ-2?

The AD7893BRZ-2 uses edge-triggered CONVST: the rising edge initiates track-to-hold transition and starts the 6 µs conversion sequence; the falling edge resets the internal serial counter. To avoid invalid reads, software must ensure SDATA access occurs either during conversion or ≥6 µs after the rising edge - and must complete ≥600 ns before the next rising edge. Using CONVST as both trigger and interrupt simplifies synchronization.

Can the AD7893BRZ-2 interface directly with a microcontroller lacking hardware SPI support?

Yes - the AD7893BRZ-2's two-wire serial interface (SCLK + SDATA) is fully compatible with GPIO-based bit-banging. Since it has no chip-select or frame-sync signal, timing is controlled solely by CONVST and SCLK edges. A 16-cycle software loop can reliably capture data; setup/hold times (t2 ≥60 ns high, t3 ≥40 ns low) are easily met by most 10+ MHz MCUs using standard I/O toggling.

What is the significance of the "BRZ" suffix in AD7893BRZ-2, and how does it differ from "ARZ" or "AN" variants?

The "BRZ" suffix denotes the AD7893BRZ-2 is a lead-free, RoHS-compliant, 8-pin SOIC (SO-8) package rated for –40°C to +85°C operation with ±1/2 LSB relative accuracy and 72 dB SNR. "ARZ" indicates same specs but in plastic DIP (N-8); "AN" denotes the same DIP package with ±1 LSB accuracy and 70 dB SNR. All share identical pinout and functionality - only package, grade, and compliance differ.