Analog Devices Inc. AD7893BN-5

Overview

AD7893BN-5 from Analog Devices is a 12-bit, single-supply serial analog-to-digital converter (ADC) with 6 µs conversion time, on-chip track/hold amplifier, and 0 V to +5 V unipolar input range. It operates from a +5 V ±5% supply, consumes 25 mW typical power, and delivers 72 dB SNR at 10 kHz input-designed for high-speed data acquisition in industrial sensor interfaces and portable instrumentation.

For engineers reviewing the AD7893BN-5 datasheet, AD7893BN-5 pinout, AD7893BN-5 application, or AD7893BN-5 equivalent, this page provides verified technical context, validated pin functions, confirmed dynamic and DC specifications, real-world use scenarios, and two rigorously cross-checked alternative parts for system-level design continuity.

Technical Context

The AD7893BN-5 implements a successive-approximation ADC core with an R-2R ladder DAC and laser-trimmed internal clock oscillator. Its on-chip track/hold acquires signals to ±1/2 LSB accuracy within 1.5 µs and supports up to 117 kHz throughput when read timing is synchronized to CONVST.

It uses a two-wire serial interface: SCLK clocks data out on rising edges, SDATA delivers 16-bit frames (4 leading zeros + 12-bit straight binary result), with data valid on falling SCLK edges. The REF IN pin accepts a buffered +2.5 V ±5% reference, directly determining full-scale gain and unipolar offset error.

Key Specifications

Pinout & Package

AD7893BN-5 is housed in an 8-pin plastic mini-DIP (N-8) package, 0.3" wide, with through-hole mounting and industry-standard pin spacing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7893BR-5, AD7893BN-5 offers lower thermal impedance for through-hole thermal management; versus ADS7822U, it integrates track/hold and reference buffer-reducing component count and layout risk at the cost of lower max sample rate.

Availability

AD7893BN-5 is available at Aetrix Electronics and suitable for industrial process monitoring, portable data loggers, medical instrumentation, and test & measurement equipment requiring stable component supply across extended temperature ranges (–40°C to +85°C).

Supply support for AD7893BN-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 DSP technologies, serving industrial, automotive, communications, and healthcare markets since 1965.

The AD7893 product line delivers fast, low-power, serial-output ADCs in minimal-footprint packages-designed specifically for space-constrained, battery-aware, and high-fidelity data acquisition systems.

FAQ

What is the input voltage range supported by the AD7893BN-5?

The AD7893BN-5 supports a unipolar analog input range of 0 V to +5 V. This is fixed for the -5 variant and requires a +2.5 V reference applied to the REF IN pin. Input resistance is specified at 9 kΩ minimum, and the device uses straight (natural) binary coding for output data. The AD7893BN-5 does not support bipolar or other input ranges-those are assigned to other variants like AD7893BN-10 or AD7893BN-3.

Does the AD7893BN-5 include an on-chip track/hold amplifier?

Yes, the AD7893BN-5 integrates a precision track/hold amplifier optimized for 12-bit performance. It acquires input signals to ±1/2 LSB accuracy within 1.5 µs and transitions from track to hold on the rising edge of the CONVST signal. This eliminates the need for external sample-and-hold circuitry, reducing board area and component count in compact data acquisition designs using the AD7893BN-5.

What reference voltage is required for proper operation of the AD7893BN-5?

The AD7893BN-5 requires a +2.5 V ±5% reference voltage applied to the REF IN pin. The input is buffered on-chip with ≤1 µA max current draw. Recommended sources include the AD780 or AD680 precision references. Deviations in reference voltage directly scale full-scale gain and contribute to unipolar offset error-so stability and accuracy of the reference directly impact AD7893BN-5 measurement fidelity.

How is serial data formatted and timed on the AD7893BN-5?

The AD7893BN-5 outputs 16-bit serial frames: four leading zeros followed by 12 bits of straight binary conversion data (MSB first). Data is clocked out on SCLK rising edges and valid on falling edges. After the 16th falling SCLK edge, SDATA is three-stated. SCLK must go low between reads, and CONVST falling edge resets the shift register-ensuring deterministic framing for reliable microcontroller or FPGA interface to the AD7893BN-5.

What is the maximum achievable sampling rate for the AD7893BN-5?

The AD7893BN-5 achieves a maximum throughput rate of 117 kHz when operated under optimum timing conditions: conversion time (6 µs), serial read time (1.92 µs at 8.33 MHz SCLK), and 600 ns acquisition guard band. Reading data during conversion allows up to 133 kHz, but with ~1.5 dB SNR degradation and increased code flicker. Full datasheet specifications-including 72 dB SNR and ±1/2 LSB linearity-are guaranteed only at ≤117 kHz with proper timing alignment per the AD7893BN-5 timing diagram.