Analog Devices Inc. AMP04ESZ-R7

Overview

AMP04ESZ-R7 from Analog Devices is a precision single-supply instrumentation amplifier optimized for low-power, high-accuracy signal conditioning in battery-powered and industrial sensor interfaces. It delivers gain of 1–1000 set by one external resistor, input offset voltage ≤150 µV, supply current ≤700 µA, and rail-to-rail output swing within 1 V of the positive rail - enabling direct interfacing with strain gages, RTDs, and thermocouples on +5 V supplies.

For engineers reviewing the AMP04ESZ-R7 datasheet, AMP04ESZ-R7 pinout, AMP04ESZ-R7 application, or AMP04ESZ-R7 equivalent, key selection considerations include its zero-in/zero-out operation, guaranteed CMRR ≥90 dB at G ≥100, laser-trimmed thin-film resistors for 0.005% gain nonlinearity, and validated performance across –40°C to +85°C in SOIC-8 packaging.

Technical Context

The AMP04ESZ-R7 implements a proprietary three-op-amp topology with input buffers that enable true ground-referenced common-mode input (0 V to V_S – 1 V) and extended negative common-mode capability down to –0.25 V. Its internal 100 kΩ feedback network and dual 11 kΩ gain-setting paths ensure stable gain accuracy independent of source impedance.

Unlike conventional instrumentation amplifiers, the AMP04ESZ-R7 exposes Pin 8 (inverting input of output stage) for external noise filtering via capacitor-to-ground, enabling configurable single-pole low-pass response (e.g., 10 Hz with 0.15 µF). The REF pin supports precise output offset control in both single- and dual-supply configurations without degrading CMRR.

Key Specifications

Pinout & Package

AMP04ESZ-R7 is housed in an 8-lead narrow-body SOIC (SO-8) package, RoHS-compliant and moisture-sensitive level 3. Pin 1 is marked with a dot; device orientation follows JEDEC MS-012 standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8221ARMZ and INA333AIDR, AMP04ESZ-R7 uniquely combines guaranteed ground-referenced input, 700 kHz bandwidth, and laser-trimmed 0.005% nonlinearity in a single SOIC-8 package - making it optimal for precision single-supply sensor interfaces demanding long-term calibration stability.

Availability

AMP04ESZ-R7 is available at Aetrix Electronics and suitable for strain gage amplification, RTD temperature measurement, and 4–20 mA loop interface applications requiring stable component supply across industrial, medical, and test equipment lifecycles.

Supply support for AMP04ESZ-R7 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 AMP04 product line was engineered specifically for precision, low-power, single-supply instrumentation amplifier applications - targeting sensor signal conditioning where ground-referenced inputs, laser-trimmed accuracy, and minimal external components are critical.

FAQ

What is the maximum guaranteed common-mode rejection ratio (CMRR) for AMP04ESZ-R7 at gain = 100?

The AMP04ESZ-R7 guarantees CMRR ≥90 dB at gain = 100 over the full –40°C to +85°C temperature range, as verified in the official Analog Devices datasheet Rev. C, page 3. This performance is enabled by laser-trimmed thin-film resistors and a proprietary input buffer architecture that maintains symmetry under varying common-mode conditions. The AMP04ESZ-R7 achieves this specification without requiring external matching components.

Can AMP04ESZ-R7 operate with a single +5 V supply and still accept input signals at ground potential?

Yes, AMP04ESZ-R7 supports true zero-volt common-mode input on a +5 V supply - its input common-mode range extends from ground to V_S – 1 V (i.e., 0 V to 4 V). This is confirmed in the "Input Common-Mode Range Includes Ground" section (page 6) and functional block diagram. Unlike conventional three-op-amp IAs, AMP04ESZ-R7's topology allows internal nodes to swing below ground, enabling direct connection of grounded sensors like 4-wire RTDs without level-shifting circuitry.

What external resistor value sets gain = 100 for AMP04ESZ-R7?

To achieve gain = 100 with AMP04ESZ-R7, connect a 1.00 kΩ resistor between Pins 1 and 8 (RGAIN terminals), per the gain equation G = 100 kΩ / R_GAIN. This value is specified in the "Programming the Gain" section (page 7) and validated across temperature. Standard 1% metal-film resistors are sufficient; no precision matching is required due to the device's internal resistor ratio accuracy.

Does AMP04ESZ-R7 support noise filtering, and how is it implemented?

Yes, AMP04ESZ-R7 supports external noise filtering via its accessible output-stage inverting input (Pin 8). As shown in Figure 6 (page 8), placing a capacitor (e.g., 0.15 µF) between Pin 6 (VOUT) and Pin 8 creates a single-pole low-pass filter with cutoff f_LP = 1/(2π × 100 kΩ × C_EXT). This feature reduces wideband noise without adding external op amps or altering gain-setting components - a unique capability not found in most instrumentation amplifiers.

What is the minimum recommended load resistance for AMP04ESZ-R7 at full output swing?

The AMP04ESZ-R7 is characterized with RL = 2 kΩ for output voltage swing specifications (e.g., VOH ≥4.0 V on +5 V supply). Driving loads lighter than 2 kΩ may reduce output swing and increase distortion; the datasheet does not guarantee performance below this value. For 5 kΩ loads, nonlinearity remains ≤0.025% at G = 100. Always verify output headroom in final layout using the actual load and supply conditions specified in the "OUTPUT" section (pages 2–4).