Analog Devices Inc. AD7893BRZ-5

Overview

AD7893BRZ-5 from Analog Devices is a 12-bit, serial-output analog-to-digital converter with 6 µs conversion time, single +5 V supply operation, and 0 V to +5 V unipolar input range. It integrates an on-chip track/hold amplifier, internal clock, and high-speed two-wire serial interface (SCLK/SDATA), and is used in precision data acquisition systems requiring compact, low-power ADCs for industrial sensor interfacing.

For engineers reviewing the AD7893BRZ-5 datasheet, AD7893BRZ-5 pinout, AD7893BRZ-5 application, or AD7893BRZ-5 equivalent, key selection criteria include its straight-binary output coding, ±1/2 LSB relative accuracy, 72 dB SNR, 1.5 µs track/hold acquisition time, and SOIC-8 package compatibility with space-constrained embedded designs.

Technical Context

The AD7893BRZ-5 implements a successive-approximation ADC core using an R-2R ladder structure, paired with a monolithic track/hold amplifier optimized for full-scale sine wave inputs up to 58 kHz. Its internal laser-trimmed oscillator eliminates external clock components, enabling deterministic 6 µs conversion timing.

Control is edge-triggered via CONVST: rising edge initiates hold mode and conversion; falling edge resets the serial shift register. Serial data output (SDATA) delivers 16-bit frames-four leading zeros followed by 12-bit straight-binary conversion result-with data valid on SCLK falling edges and output tri-stated after the 16th falling edge.

Key Specifications

Pinout & Package

AD7893BRZ-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 AD7893ARZ-5 and ADS7822U, the AD7893BRZ-5 uniquely combines SOIC-8 packaging, integrated track/hold, internal clock, and guaranteed ±1/2 LSB linearity - making it the most space-efficient, component-minimal solution for 117 kSPS unipolar data acquisition in industrial embedded systems.

Availability

AD7893BRZ-5 is available at Aetrix Electronics and suitable for industrial process monitoring, portable data loggers, test equipment, and motor control feedback systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for AD7893BRZ-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 AD7893BRZ-5 belongs to Analog Devices' precision data acquisition ADC family, designed specifically for space-constrained, low-power industrial and instrumentation applications where integration, reliability, and dc/dc accuracy are prioritized over raw speed.

FAQ

What is the reference voltage requirement for AD7893BRZ-5?

The AD7893BRZ-5 requires a buffered +2.5 V ±5% reference applied to the REF IN pin. This reference sets the full-scale range for the 0 V to +5 V input; deviations directly cause gain errors. The part draws ≤1 µA from REF IN, supporting low-drift references like the AD780 or AD680. Using an inaccurate or noisy reference degrades SNR and linearity performance.

Does AD7893BRZ-5 support simultaneous sampling with other ADCs?

No, the AD7893BRZ-5 does not support hardware-triggered simultaneous sampling across multiple devices. It uses a single CONVST input for conversion initiation and lacks a dedicated synchronization or daisy-chain capability. For multi-channel synchronized acquisition, external timing control with matched CONVST propagation delays is required - but true simultaneous sampling is not guaranteed due to part-to-part aperture uncertainty.

Can AD7893BRZ-5 operate with a 3.3 V supply?

No, the AD7893BRZ-5 is specified only for +5 V ±5% (4.75 V to 5.25 V) operation. VDD outside this range violates Absolute Maximum Ratings and causes undefined behavior, including incorrect conversion results or permanent damage. It cannot interface directly with 3.3 V logic without level-shifting SCLK and SDATA signals, and DGND/AGND must remain referenced to the 5 V domain.

What is the purpose of the four leading zeros in AD7893BRZ-5's serial output?

The AD7893BRZ-5 outputs 16 clock cycles per conversion: the first four bits are always zero, followed by the 12-bit straight-binary result (MSB first). This framing ensures consistent word alignment regardless of MCU bit-width and simplifies firmware parsing - especially on 8-bit microcontrollers that read data in byte chunks. The zeros also provide setup time for the SDATA line before valid data appears.

How is the track/hold acquisition time used in system timing for AD7893BRZ-5?

The 1.5 µs track/hold acquisition time specifies the minimum delay required after conversion completion (or after a step change at VIN) before initiating the next CONVST rising edge. If violated, the track/hold output fails to settle within ±1/2 LSB, causing code-dependent errors. In practice, this mandates ≥600 ns gap between end of read operation and next CONVST edge - enforced via software delay or hardware timing control.