Analog Devices Inc. AD7893ANZ-10

Overview

AD7893ANZ-10 from Analog Devices is a 12-bit successive-approximation ADC with ±10 V analog input range, 6 µs conversion time, on-chip track/hold amplifier, and high-speed two-wire serial interface (SCLK/SDATA), operating from a single +5 V supply and consuming 25 mW typical power. It is used in precision data acquisition systems requiring fast, low-power digitization of bipolar industrial sensor signals.

For engineers reviewing the AD7893ANZ-10 datasheet, AD7893ANZ-10 pinout, AD7893ANZ-10 application, or AD7893ANZ-10 equivalent, this page delivers verified technical context, real-world timing constraints, input scaling behavior, serial data format (4 leading zeros + 12-bit twos-complement), and validated alternative options for ±10 V signal chain design.

Technical Context

The AD7893ANZ-10 implements a laser-trimmed internal clock driving a 12-bit R-2R ladder SAR core, with integrated track/hold that acquires to ±1/2 LSB in ≤1.5 µs after conversion end or input step change. Its analog front-end includes resistor-scaling network (R1=30 kΩ, R2=7.5 kΩ, R3=10 kΩ) enabling ±10 V input into 16 kΩ min input resistance while maintaining single +5 V operation.

Serial interface timing requires strict coordination: CONVST rising edge initiates conversion and hold mode; SDATA outputs 16 bits (4 zeros + 12-bit twos-complement) synchronized to SCLK rising edges, with data valid on falling edges; read must avoid 600 ns before next CONVST rising edge to meet 70 dB SNR and ±1 LSB relative accuracy specifications.

Key Specifications

Pinout & Package

AD7893ANZ-10 is housed in an 8-pin plastic mini-DIP (N-8 package), 0.3" wide, with through-hole mounting and standard DIP pin spacing. Pin 1 is marked by notch or dot; top view orientation follows industry-standard numbering (1–4 top row left-to-right, 8–5 bottom row right-to-left).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7893ARZ-10, the AD7893ANZ-10 offers easier manual handling and thermal margin in convection-cooled enclosures, while ADS7822U lacks on-chip ±10 V scaling and adds design complexity-making AD7893ANZ-10 the optimal choice for compact, low-risk ±10 V acquisition where board space and supply simplicity are critical.

Availability

AD7893ANZ-10 is available at Aetrix Electronics and suitable for industrial process monitoring, portable data loggers, automated test equipment, and motor control feedback loops requiring stable component supply across extended temperature ranges (–40°C to +85°C).

Supply support for AD7893ANZ-10 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 specifically for space-constrained, low-power data acquisition systems requiring fast, precise digitization of bipolar analog signals without external support components.

FAQ

What is the absolute maximum analog input voltage for AD7893ANZ-10?

The absolute maximum analog input voltage for AD7893ANZ-10 is ±17 V referenced to AGND. Exceeding this rating-even momentarily-may cause permanent damage. The specified operating range remains ±10 V; operation beyond ±10 V violates linearity and accuracy specs and risks latch-up. Always include input clamping diodes or series resistors in designs exposed to transient overvoltage.

Does AD7893ANZ-10 require an external clock source?

No, AD7893ANZ-10 does not require an external clock for conversion-it uses an internal laser-trimmed oscillator to achieve its guaranteed 6 µs conversion time. However, an external serial clock (SCLK) is mandatory to read data from the SDATA pin; SCLK frequency must be ≤8.33 MHz and properly timed relative to CONVST to meet SNR and accuracy specs.

How is the serial data formatted on SDATA for AD7893ANZ-10?

AD7893ANZ-10 outputs 16 bits per conversion on SDATA: four leading zeros followed by the 12-bit twos-complement result, MSB first. After the 16th falling edge of SCLK, SDATA enters high-impedance (three-state) mode. Attempting to clock beyond 16 bits corrupts the shift register state unless reset by CONVST's falling edge.

Can AD7893ANZ-10 operate with a 3.3 V supply?

No, AD7893ANZ-10 is specified only for +5 V ±5% (4.75 V to 5.25 V) operation. Applying 3.3 V will result in undefined behavior, failure to convert, or damage. The internal bandgap reference, track/hold amplifier, and logic thresholds are all calibrated for 5 V; no 3.3 V variant exists in the AD7893 family.

What is the purpose of the 600 ns timing constraint before the next CONVST rising edge?

The 600 ns delay ensures the track/hold amplifier fully settles after returning to track mode post-conversion (which occurs 6 µs after CONVST rising edge). Violating this window degrades SNR below 70 dB and increases code flicker due to incomplete acquisition-directly impacting measurement repeatability in precision applications using AD7893ANZ-10.