Analog Devices Inc. AMP04FPZ

Overview

AMP04FPZ 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 via a single external resistor (RGAIN), input offset voltage ≤150 µV max, supply current ≤700 µA, and rail-to-rail output swing within 1 V of the positive rail - enabling direct interfacing with RTDs, strain gages, and thermocouples on +5 V supplies.

For engineers reviewing the AMP04FPZ datasheet, AMP04FPZ pinout, AMP04FPZ application, or AMP04FPZ equivalent, key selection criteria include guaranteed CMRR ≥90 dB at G ≥100, zero-in/zero-out operation with REF pin offset control, input common-mode range extending to ground (0 V), and laser-trimmed thin-film resistors ensuring 0.005% gain nonlinearity and 30 ppm/°C gain tempco.

Technical Context

The AMP04FPZ employs a proprietary three-op-amp topology with matched input buffers and laser-trimmed 11 kΩ/100 kΩ thin-film resistor networks, enabling true zero-input common-mode operation and eliminating saturation limitations seen in conventional architectures. Its internal gain-setting network fixes the gain equation as G = 100 kΩ / RGAIN, with no external feedback required.

It supports dual-supply (±2.5 V to ±18 V) and single-supply (+5 V to +12 V) operation, with input bias currents <5 nA and drift <8 pA/°C - allowing direct connection to high-impedance transducers. The accessible inverting input (Pin 8) enables external noise filtering via capacitor-based single-pole low-pass configuration.

Key Specifications

Pinout & Package

AMP04FPZ is housed in an 8-lead narrow-body SOIC (SO-8) package with standard JEDEC MS-012AC footprint (4.9 mm × 3.9 mm × 1.75 mm height). Pin 1 is marked with dot; pins are numbered counterclockwise.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8421ARZ and INA333AIDR, AMP04FPZ uniquely combines guaranteed zero-input common-mode operation on +5 V, laser-trimmed 0.005% nonlinearity, and single-resistor programmability - making it optimal for cost-sensitive, high-accuracy industrial sensor nodes where layout simplicity and calibration stability are prioritized over raw speed or ultra-low quiescent current.

Availability

AMP04FPZ is available at Aetrix Electronics and suitable for strain gage signal conditioning, RTD temperature measurement, and battery-powered data acquisition requiring stable component supply across industrial, medical, and test equipment programs.

Supply support for AMP04FPZ 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, founded in 1965 and headquartered in Wilmington, MA.

The AMP04FPZ belongs to Analog Devices' precision instrumentation amplifier product line, designed specifically for low-power, high-accuracy sensor signal conditioning in industrial process control, medical instrumentation, and portable test equipment.

FAQ

What is the maximum gain achievable with AMP04FPZ, and how is it set?

The AMP04FPZ supports a maximum gain of 1000, set precisely using a single external resistor (RGAIN) connected between Pins 1 and 8. The gain equation is G = 100 kΩ / RGAIN - for G = 1000, RGAIN = 100 Ω. This architecture eliminates external feedback components and ensures predictable, stable gain across temperature. The AMP04FPZ datasheet specifies gain accuracy of ±0.4% at G = 1000, with nonlinearity held to 0.025%.

Can AMP04FPZ operate from a single +5 V supply with inputs at ground potential?

Yes, AMP04FPZ is explicitly designed for true zero-input common-mode operation on single +5 V supplies. Its proprietary input stage allows the input common-mode voltage range to extend from 0 V to (VS+ – 1 V), and the output swings within 1 V of VS+. This enables direct connection of grounded sensors like RTDs and thermocouples without level-shifting circuitry - a key differentiator confirmed in the "Input Common-Mode Range Includes Ground" section of the AMP04FPZ datasheet.

What is the input offset voltage specification for AMP04FPZ, and how is it achieved?

The AMP04FPZ guarantees a maximum input offset voltage of 150 µV over the extended industrial temperature range (–40°C to +85°C). This performance is achieved through laser trimming of low-drift thin-film resistors in the internal gain network and high-gain input amplifiers. The datasheet confirms typical VIOS = 30 µV and max = 150 µV for the F-grade (AMP04F), which corresponds to the FPZ suffix. This enables sub-0.1°C accuracy in precision temperature measurement circuits.

Does AMP04FPZ support external noise filtering, and how is it implemented?

Yes, AMP04FPZ supports external noise filtering via its accessible inverting input (Pin 8). By placing a capacitor (CEXT) between Pins 6 (VOUT) and 8, a single-pole low-pass filter is formed with cutoff frequency fLP = 1 / (2π × 100 kΩ × CEXT). For example, a 0.15 µF capacitor yields a 10 Hz cutoff - reducing wideband noise by ~4× as demonstrated in Figure 7c of the AMP04FPZ datasheet. This feature is unique among instrumentation amplifiers and does not compromise gain accuracy or stability.

What package type and lead finish does AMP04FPZ use?

AMP04FPZ uses an 8-lead narrow-body SOIC (SO-8) package conforming to JEDEC MS-012AC outline, with dimensions 4.9 mm × 3.9 mm × 1.75 mm. It features matte tin (Sn) lead finish, RoHS-compliant, and is rated for reflow soldering per J-STD-020. The 'FPZ' suffix explicitly denotes this SOIC package with Pb-free finish - distinct from the plastic DIP (P suffix) and ceramic DIP (J suffix) variants.