Analog Devices Inc. AD8251ARMZ-RL

Overview

AD8251ARMZ-RL from Analog Devices is a programmable gain instrumentation amplifier (PGIA) with iCMOS® process technology, delivering 10 MHz bandwidth, 20 V/μs slew rate, and digitally selectable gains of 1, 2, 4, or 8. It features 98 dB minimum CMRR at G = 8, 1.8 μV/°C offset drift, and 785 ns settling time to 0.001%, making it ideal for high-precision sensor signal conditioning in data acquisition systems.

For engineers reviewing the AD8251ARMZ-RL datasheet, AD8251ARMZ-RL pinout, AD8251ARMZ-RL application, or AD8251ARMZ-RL equivalent, key selection criteria include guaranteed gain error ≤0.04%, input impedance >1 GΩ, ±5 V to ±15 V dual-supply operation, and MSOP-10 package compatibility with space-constrained PCB layouts.

Technical Context

The AD8251ARMZ-RL implements a classic 3-op-amp topology with laser-trimmed internal resistor arrays enabling precise, stable gain switching. Its iCMOS® fabrication ensures robust digital interface performance alongside analog precision, supporting both transparent and latched gain modes via A0/A1 control pins and WR strobe.

It delivers frequency-compensated bandwidth up to 10 MHz (G = 1), maintains ≥80 dB CMRR to 50 kHz, and achieves −110 dB THD at 1 kHz with 10 V swing-enabling direct interfacing with high-speed SAR ADCs while preserving dc accuracy and dynamic linearity.

Key Specifications

Pinout & Package

AD8251ARMZ-RL is housed in a 10-lead MSOP package (3 mm × 3 mm, 0.5 mm pitch), optimized for thermal performance and high-density layout. Pin 1 is marked by a dot; exposed pad is not electrically connected.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar programmable gain instrumentation amplifier applications.

Compared with AD8253ARMZ and LTC6915CMS, the AD8251ARMZ-RL uniquely combines 10 MHz bandwidth, dual-supply flexibility, parallel/latched/transparent gain modes, and guaranteed 98 dB CMRR at G = 8-making it the preferred choice for high-speed, high-accuracy industrial DAQ and test equipment where timing predictability and dc precision are co-critical.

Availability

AD8251ARMZ-RL is available at Aetrix Electronics and suitable for data acquisition, biomedical analysis, and test and measurement applications requiring stable component supply, extended temperature operation (−40°C to +85°C), and RoHS-compliant packaging.

Supply support for AD8251ARMZ-RL 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, serving industrial, communications, automotive, and healthcare markets since 1965.

The AD8251ARMZ-RL belongs to Analog Devices' precision instrumentation amplifier product line, engineered specifically for applications demanding simultaneous high speed, low drift, and programmable gain-such as automated test equipment and medical diagnostics systems.

FAQ

What gain settings does the AD8251ARMZ-RL support, and how are they selected?

The AD8251ARMZ-RL supports four discrete gain settings: 1, 2, 4, and 8. These are selected via two digital control pins-A0 (LSB) and A1 (MSB)-using either transparent mode (WR tied to −VS) or latched mode (WR edge-triggered). In transparent mode, gain changes immediately with A0/A1 logic levels; in latched mode, the falling edge of WR captures the A0/A1 state. Both methods are fully supported in the AD8251ARMZ-RL datasheet Rev. B and require no external components.

Does the AD8251ARMZ-RL require external resistors for gain setting?

No, the AD8251ARMZ-RL does not require external resistors for gain setting. All gain configurations are implemented using an internal, laser-trimmed precision resistor array fabricated on the iCMOS® process. This eliminates external component variation, ensures gain error ≤0.04% across all settings, and guarantees matched resistor ratios critical for CMRR and gain linearity-key advantages confirmed in the AD8251ARMZ-RL specifications table.

What is the maximum operating temperature range for the AD8251ARMZ-RL?

The AD8251ARMZ-RL is specified for full performance over the industrial temperature range of −40°C to +85°C. This includes all key parameters such as gain error, CMRR, offset drift, and settling time. The device's junction temperature must not exceed 140°C, and its thermal resistance (θJA) is 112°C/W on a four-layer JEDEC board-details verified in the AD8251ARMZ-RL Absolute Maximum Ratings and Thermal Characteristics sections.

Can the AD8251ARMZ-RL operate from a single supply?

No, the AD8251ARMZ-RL is designed exclusively for dual-supply operation, with specified supply range of ±5 V to ±15 V. It does not support true single-supply operation (e.g., 0 V and +5 V). Attempting single-supply use violates the Absolute Maximum Ratings and will result in undefined behavior or damage. For single-supply applications, consider alternatives like the LTC6915CMS-but note that AD8251ARMZ-RL requires symmetric rails for guaranteed performance.

How does the AD8251ARMZ-RL handle reference voltage configuration?

The AD8251ARMZ-RL uses the REF pin to set the output common-mode voltage, accepting any dc voltage from −VS to +VS. When REF = 0 V, the output centers at 0 V; when REF = +2.5 V, the output swings symmetrically around 2.5 V. This enables direct interfacing with unipolar ADCs or level-shifting to match downstream signal chain requirements. The REF input has 20 kΩ input resistance and 1 μA bias current, as specified in the AD8251ARMZ-RL datasheet Table 2.