Analog Devices Inc. AD8250ARMZ-RL

Overview

AD8250ARMZ-RL from Analog Devices is a digitally programmable gain instrumentation amplifier (PGIA) with GΩ input impedance, 10 MHz bandwidth, 20 V/μs slew rate, and selectable gains of 1, 2, 5, and 10 - designed for high-precision sensor signal conditioning in data acquisition systems interfacing with fast ADCs.

For engineers reviewing the AD8250ARMZ-RL datasheet, AD8250ARMZ-RL pinout, AD8250ARMZ-RL application, or AD8250ARMZ-RL equivalent, this page delivers verified specifications, functional context, package details, real-world use cases, and validated alternative options - all grounded in Rev. C datasheet parameters and iCMOS® process characteristics.

Technical Context

The AD8250ARMZ-RL implements a classic 3-op-amp instrumentation topology on Analog Devices' proprietary iCMOS® process, enabling precision DC performance (±70 μV offset RTI at G=1) alongside high-speed AC behavior (615 ns settling to 0.001%). Gain selection uses a parallel 2-bit digital interface (A0/A1) with transparent or latched modes controlled by WR.

It features laser-trimmed internal resistor arrays ensuring <0.03% gain error at G=1 and guaranteed CMRR ≥98 dB at G=10 (DC–60 Hz), while maintaining ≥80 dB CMRR up to 50 kHz. Input common-mode range extends to ±VS −1.5 V, and output swing reaches ±13.5 V on ±15 V supplies.

Key Specifications

Pinout & Package

AD8250ARMZ-RL is housed in a 10-lead MSOP package (3 mm × 3 mm, 0.5 mm pitch), optimized for high-density PCB layouts and thermal performance (θ_JA = 112°C/W on 4-layer JEDEC board).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8250ARMZ-RL, AD8251ARMZ offers finer gain resolution and lower distortion but lacks 5× gain and requires external buffering, while LTC6915CMS8#PBF trades bandwidth and bipolar supply support for SPI control and single-supply convenience - making AD8250ARMZ-RL optimal for high-speed, wide-supply, multi-gain industrial data acquisition.

Availability

AD8250ARMZ-RL is available at Aetrix Electronics and suitable for data acquisition, biomedical analysis, and test and measurement applications requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.

Supply support for AD8250ARMZ-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, headquartered in Norwood, MA, with decades of expertise in precision amplifiers and data conversion.

The AD8250ARMZ-RL belongs to Analog Devices' iCMOS® programmable gain instrumentation amplifier product line, engineered specifically for high-accuracy, high-speed sensor signal conditioning in industrial, medical, and test equipment where DC precision and AC bandwidth must coexist.

FAQ

What gain settings does the AD8250ARMZ-RL support, and how are they selected?

The AD8250ARMZ-RL supports four discrete gains: 1, 2, 5, and 10, selected via two digital inputs (A0 and A1) 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 gain updates on the falling edge of WR. The AD8250ARMZ-RL datasheet specifies logic thresholds relative to DGND, with typical 0 V/5 V compatibility.

How does the AD8250ARMZ-RL achieve high CMRR over frequency, especially above 1 kHz?

The AD8250ARMZ-RL achieves ≥80 dB CMRR up to 50 kHz through a combination of balanced input pin layout, matched internal resistor networks fabricated on the iCMOS® process, and optimized amplifier compensation. Its pinout minimizes parasitic capacitance asymmetry between +IN and −IN, while laser trimming ensures initial resistor matching better than 0.03% - directly enabling the specified high-frequency CMRR performance confirmed in Figure 19 of the AD8250ARMZ-RL datasheet.

Can the AD8250ARMZ-RL operate from a single supply, and what are the limitations?

The AD8250ARMZ-RL is specified for dual-supply operation (±5 V to ±15 V) and is not characterized for true single-supply use. While the input common-mode range extends to −VS + 1.5 V and +VS − 1.5 V, and the output swings to within 1.5 V of each rail, operation with only +VS and GND violates the absolute maximum rating for supply voltage imbalance and risks parametric degradation. For single-supply applications, Analog Devices recommends alternatives like the AD8231 or LTC6915 - not the AD8250ARMZ-RL.

What is the maximum capacitive load the AD8250ARMZ-RL can drive without instability?

The AD8250ARMZ-RL is stable driving up to 100 pF capacitive load with a 2 kΩ resistive load, as verified in Figure 36 of the datasheet showing clean small-signal pulse response. Driving larger capacitive loads (e.g., >100 pF) requires external isolation resistance (typically 10–50 Ω in series with the output) to maintain phase margin. The AD8250ARMZ-RL's output stage is not unity-gain compensated for heavy capacitive loading, so layout parasitics and cable capacitance must be accounted for in high-frequency designs.

Does the AD8250ARMZ-RL require external precision resistors for gain setting?

No, the AD8250ARMZ-RL does not require external precision resistors. All gain-setting resistors are integrated, laser-trimmed, and matched on-chip using Analog Devices' iCMOS® process. This eliminates external component count, layout sensitivity, and drift sources - delivering guaranteed gain error of ≤0.03% at G = 1 and ≤0.04% at G = 2/5/10, as specified in Table 2 of the AD8250ARMZ-RL datasheet. External resistors are unnecessary and would compromise performance.