Analog Devices Inc. AD7898ARZ-10

Overview

AD7898ARZ-10 from Analog Devices is a 12-bit successive approximation ADC with ±10 V bipolar input range, 220 kSPS throughput, single 5 V supply operation, and integrated track/hold amplifier - designed for precision data acquisition in industrial sensor interfaces and motor control feedback loops.

For engineers reviewing the AD7898ARZ-10 datasheet, AD7898ARZ-10 pinout, AD7898ARZ-10 application, or AD7898ARZ-10 equivalent, key selection criteria include its 71 dB SNR at 30 kHz, ±1 LSB relative accuracy, 3.6 MHz full-power bandwidth (±10 V range), dual-mode serial interface (Mode 0/Mode 1), and Pb-free 8-lead SOIC package compatibility with 3 V or 5 V logic systems.

Technical Context

The AD7898ARZ-10 implements a laser-trimmed internal oscillator for Mode 0 operation (CONVST-triggered, 3.3 µs conversion time) and supports external SCLK-synchronized Mode 1 operation (16-cycle serial read, power-down capable). Its analog front-end uses a resistive ladder network (R1=30 kΩ, R2=7.5 kΩ, R3=10 kΩ) to scale ±10 V inputs to the internal 2.5 V reference, enabling high-impedance sampling without dynamic charge injection.

It delivers twos-complement 16-bit serial output (4 leading zeros + 12-bit result, MSB first), with guaranteed data validity window of 20 ns after SCLK falling edge and bus relinquish timing defined per VDRIVE voltage (2.7–5.25 V). Aperture jitter is 75 ps typ, supporting accurate subsampling up to 3.6 MHz full-power bandwidth.

Key Specifications

Pinout & Package

AD7898ARZ-10 is housed in an 8-lead Pb-free SOIC (R-8) package with standard 1.27 mm pitch and 5.0 mm × 6.2 mm body dimensions. Pin 1 is marked by a beveled corner or dot; device orientation follows JEDEC MS-012AA.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7898ARZ-10, AD7490BRUZ offers higher resolution at the cost of increased BOM complexity and loss of integrated signal conditioning, while ADS7822U reduces feature set to meet lower-cost targets but sacrifices input range and interface flexibility essential for industrial analog front-ends.

Availability

AD7898ARZ-10 is available at Aetrix Electronics and suitable for industrial automation, motor control, and portable instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for AD7898ARZ-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA.

The AD7898 product line delivers compact, low-power, high-accuracy SAR ADCs optimized for industrial data acquisition where ±10 V input range, single-supply operation, and serial interface flexibility are critical design requirements.

FAQ

What is the maximum input voltage the AD7898ARZ-10 can safely handle?

The AD7898ARZ-10 has an absolute maximum analog input rating of ±17 V, but its specified linear input range is ±10 V. Operation beyond ±10 V will saturate the ADC and may cause measurement errors or damage if sustained. For robust protection, external clamping diodes and series resistors are recommended when transient overvoltage risk exists.

Does the AD7898ARZ-10 require an external reference voltage?

Yes, the AD7898ARZ-10 requires an external 2.5 V ±5% reference applied to the REF IN pin. The internal reference buffer supports up to 1 µA input current, and a 0.1 µF ceramic capacitor must be placed directly at the REF IN pin to maintain stability and noise performance.

How does the VDRIVE pin affect the AD7898ARZ-10's digital interface?

The VDRIVE pin sets the logic voltage level for SDATA, SCLK, and CS/CONVST pins independently of VDD. When VDRIVE = 3.0 V, the AD7898ARZ-10 drives and accepts 3 V logic signals while operating from a 5 V VDD supply - eliminating level shifters in mixed-voltage microcontroller systems.

What is the difference between Mode 0 and Mode 1 operation in the AD7898ARZ-10?

In Mode 0, conversion is initiated by a falling edge on CS/CONVST and controlled by the internal oscillator (3.3 µs conversion time); in Mode 1, SCLK serves as both conversion clock and serial interface clock (4.33 µs min conversion time), enabling power-down between conversions. Both modes support 220 kSPS and identical 3-wire communication.

Can the AD7898ARZ-10 interface directly with a 3.3 V microcontroller?

Yes - configure VDRIVE = 3.3 V and connect SCLK, CS/CONVST, and SDATA directly to the microcontroller's GPIOs. The AD7898ARZ-10's output VOH is VDRIVE – 0.4 V (≥2.9 V) and VOL is ≤0.4 V, meeting 3.3 V logic thresholds. No level-shifting circuitry is needed when VDRIVE matches the host I/O voltage.