Analog Devices Inc. AD7899BR-1

Overview

AD7899BR-1 from Analog Devices is a 14-bit, 400 kSPS successive-approximation ADC with integrated track/hold, 2.5 V reference, and high-speed parallel interface. It operates from a single 5 V supply, supports ±5 V and ±10 V bipolar input ranges, and delivers ±1.5 LSB INL max over –40°C to +85°C - used in precision industrial data acquisition systems requiring fast, low-power digitization of sensor or control signals.

For engineers reviewing the AD7899BR-1 datasheet, AD7899BR-1 pinout, AD7899BR-1 application, or AD7899BR-1 equivalent, this page provides verified technical context, real-world timing and accuracy specs, package-validated pin functions, and two confirmed alternative parts for design flexibility in high-throughput analog-to-digital conversion.

Technical Context

The AD7899BR-1 implements a laser-trimmed internal clock oscillator (2.2 µs conversion time) or accepts external CLKIN up to 6.5 MHz for precise throughput control. Its track/hold acquires to ±1/2 LSB in 0.3 µs and features ±18 V overvoltage protection on VINA/VINB when configured for ±10 V range.

It uses two's complement output coding, supports 3 V or 5 V digital I/O via dedicated VDRIVE pin, and integrates a buffered 2.5 V reference (±20 mV max error over temperature) accessible at VREF pin - enabling direct connection to external precision references like AD780 or REF43.

Key Specifications

Pinout & Package

AD7899BR-1 is housed in a 28-lead SOIC (R-28) package with standard 0.3-inch body width and 1.27 mm pitch. Pin 1 is marked by a beveled corner; pins are numbered counterclockwise from top-left in top view.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 14-bit, high-speed parallel ADC applications.

Compared with AD7899AR-1 and AD7899BR-3, the AD7899BR-1 uniquely balances tighter ±1.5 LSB linearity, wide ±5 V/±10 V input flexibility, and commercial temperature grade - making it optimal for general-purpose industrial DAQ where accuracy and range adaptability are both critical.

Availability

AD7899BR-1 is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, portable instrumentation, and motor drive current sensing requiring stable component supply and long-term obsolescence management.

Supply support for AD7899BR-1 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 AD7899 product line delivers high-speed, low-power 14-bit ADCs with integrated signal conditioning for precision data acquisition - designed specifically for industrial instrumentation, test & measurement, and embedded control systems demanding robustness and accuracy.

FAQ

What input voltage ranges does the AD7899BR-1 support?

The AD7899BR-1 supports ±5 V and ±10 V bipolar input ranges. Configuration is achieved externally: for ±10 V, VINB is grounded and signal applied to VINA; for ±5 V, VINA and VINB are tied together. Absolute maximum ratings allow ±18 V on VINA during transients - protecting against field-induced surges without external clamping.

How does the AD7899BR-1 handle reference voltage selection?

The AD7899BR-1 uses an internal 2.5 V ±20 mV reference by default, accessible at the VREF pin with a 0.1 µF decoupling capacitor to AGND. To improve accuracy or enable system-level calibration, an external 2.5 V ±5% reference (e.g., AD780 or REF43) can be connected directly to VREF - overriding the internal source while maintaining full 14-bit performance.

Can the AD7899BR-1 interface with 3 V microcontrollers?

Yes - the AD7899BR-1 supports 3 V logic interfacing via its dedicated VDRIVE pin. When VDRIVE is supplied with 3 V ±10%, all digital inputs (CS, RD, CONVST, CLKIN) and outputs (DB0–DB13, BUSY/EOC) operate at 3 V logic levels. This eliminates level shifters and simplifies integration with modern low-voltage processors and FPGAs.

What is the conversion timing behavior of the AD7899BR-1?

The AD7899BR-1 completes conversion in 2.2 µs using its internal laser-trimmed oscillator, enabling 400 kSPS throughput. With external CLKIN (up to 6.5 MHz), conversion time extends to 2.46 µs. The BUSY/EOC signal goes high on CONVST rising edge and returns low upon completion - providing precise hardware handshaking for tightly timed read cycles.

Does the AD7899BR-1 require external components for basic operation?

Yes - minimum external components include: a 0.1 µF ceramic capacitor from VREF to AGND (for internal reference use), a 0.1 µF capacitor from VDRIVE to DGND, and proper grounding of OPGND to the analog ground plane. No external clock, op-amps, or reference buffers are required unless higher accuracy or external synchronization is needed.