Analog Devices Inc. AD7899ARZ-1REEL

Overview

AD7899ARZ-1REEL 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 ±10 V/±5 V input ranges, delivers 78 dB SNR at 100 kHz input, and features 2.2 µs conversion time and 0.3 µs track/hold acquisition - used in precision data acquisition systems for industrial process control and automated test equipment.

For engineers reviewing the AD7899ARZ-1REEL datasheet, AD7899ARZ-1REEL pinout, AD7899ARZ-1REEL application, or AD7899ARZ-1REEL equivalent, key selection criteria include bipolar input range support (±10 V/±5 V), internal reference accuracy (±10 mV @ 25°C), power-down via STBY pin (20 µA standby current), and compatibility with both 3 V and 5 V digital logic through VDRIVE.

Technical Context

The AD7899ARZ-1REEL implements a laser-trimmed internal clock oscillator (enabling 400 kSPS throughput without external timing components) and supports external clocking via CLKIN with 6.5 MHz max frequency. Its track/hold amplifier achieves 4.5 MHz –3 dB full-power bandwidth and 25 ps aperture jitter, ensuring accurate sampling of high-frequency analog signals up to 200 kHz.

Conversion control uses edge-triggered CONVST to initiate hold mode and start conversion; BUSY/EOC serves dual-mode signaling (busy-active or EOC-pulse), while read access employs standard CS/RD strobes with 35 ns minimum pulse width and 3–40 ns data access time depending on VDRIVE level (3 V or 5 V).

Key Specifications

Pinout & Package

AD7899ARZ-1REEL is housed in a 28-lead SOIC package (R-28), RoHS-compliant, with 0.3-inch body width and standard gull-wing lead form. Pin 1 marked by notch or dot; recommended PCB layout includes separate AGND/DGND planes tied at single point near OPGND (Pin 14) and decoupling capacitors (0.1 µF) on VREF (Pin 1), VDD (Pin 5), and VDRIVE (Pin 15).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7899BR-1, AD7899ARZ-1REEL trades 0.5 LSB linearity for broader commercial availability and lower unit cost; versus ADS8515IPWR, it delivers 1.6× higher throughput and eliminates four external components (SHA, REF, CLK, level shifter), reducing design risk and validation time.

Availability

AD7899ARZ-1REEL is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, and power quality analyzers requiring stable component supply, long-term obsolescence planning, and traceable sourcing from authorized channels.

Supply support for AD7899ARZ-1REEL 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, precision ADCs with integrated analog front-ends for demanding data acquisition applications where accuracy, speed, and system integration efficiency are critical.

FAQ

What input voltage ranges does the AD7899ARZ-1REEL support?

The AD7899ARZ-1REEL supports ±10 V and ±5 V bipolar input ranges. Configuration is achieved by strapping VINB to AGND (for ±10 V) or tying VINA and VINB together (for ±5 V). The part tolerates overvoltage up to ±18 V on analog inputs without damage, making it robust in noisy industrial settings. This capability is confirmed in the Absolute Maximum Ratings and Analog Input Section of the AD7899 datasheet.

Does the AD7899ARZ-1REEL require an external clock to operate?

No, the AD7899ARZ-1REEL includes a laser-trimmed internal clock oscillator enabling full 400 kSPS throughput without any external timing components. An external clock may be applied via CLKIN only if user-controlled conversion timing is needed; the device automatically selects internal or external clock based on CLKIN state at CONVST rising edge. This dual-clock flexibility is documented in the Timing and Control section.

How does the AD7899ARZ-1REEL handle power management?

The AD7899ARZ-1REEL uses the STBY pin to enter a low-power standby mode drawing just 20 µA max. In this state, the internal reference and oscillator remain active, allowing wake-up in under 5 µs. Power dissipation drops from 80 mW (normal) to 125 µW (standby), supporting energy-sensitive portable instrumentation. This behavior is specified in the POWER REQUIREMENTS table and Standby Mode Operation section.

What is the role of the VDRIVE pin on the AD7899ARZ-1REEL?

The VDRIVE pin supplies power to the digital I/O buffers, enabling independent voltage setting for the parallel interface. It can be tied to 3 V or 5 V, allowing seamless connection to 3 V microcontrollers or FPGAs without level-shifting circuitry. Logic thresholds scale with VDRIVE (e.g., VIH = VDRIVE/2 + 0.4 V), and timing parameters adjust accordingly - details are in the LOGIC INPUTS/OUTPUTS specifications.

Is the AD7899ARZ-1REEL compatible with 3 V microprocessors?

Yes, the AD7899ARZ-1REEL is fully compatible with 3 V microprocessors via its VDRIVE pin. When VDRIVE is set to 3 V, all digital inputs (CS, RD, CONVST, CLKIN, STBY) recognize 1.9 V as high and 1.1 V as low, while outputs (DB0–DB13, BUSY/EOC) drive to 2.6 V high and 0.4 V low - meeting 3 V logic standards. This interoperability is verified in the LOGIC INPUTS/OUTPUTS tables and PRODUCT HIGHLIGHTS.