Analog Devices Inc. AD8031ANZ

Overview

AD8031ANZ from Analog Devices is a single-channel, rail-to-rail input/output voltage feedback operational amplifier optimized for high-speed, low-power applications. It delivers 80 MHz small-signal bandwidth, 30 V/μs slew rate, and 125 ns settling time to 0.1% while consuming only 800 μA per amplifier at +5 V supply - enabling high-fidelity signal conditioning in battery-powered instrumentation and A/D converter buffering.

For engineers reviewing the AD8031ANZ datasheet, AD8031ANZ pinout, AD8031ANZ application, or AD8031ANZ equivalent, key selection criteria include its rail-to-rail I/O swing (within 20 mV of rails), −62 dBc THD at 1 MHz, 2.7 V to 12 V single-supply operation, and guaranteed performance across −40°C to +85°C industrial temperature range.

Technical Context

The AD8031ANZ employs an XFCB bipolar process with dual-input-stage architecture: a PNP pair active for common-mode voltages up to 1.1 V below V_CC, and an NPN pair engaged near the positive rail to enable true rail-to-rail input operation without phase reversal up to 500 mV beyond supplies. Its output stage uses complementary common-emitter transistors with ~25 Ω effective collector resistance.

This architecture enables 80 MHz bandwidth at G = +1 with only 800 μA quiescent current, while maintaining 76 dB open-loop gain and 64 dB CMRR (at 25°C, V_CM = 0–1.55 V) - critical for precision, wide-dynamic-range signal acquisition in single-supply systems.

Key Specifications

Pinout & Package

AD8031ANZ is supplied in an 8-lead PDIP (N) package with standard through-hole mounting and 0.3-inch body width. Pin 1 is NC (no connect); pins 2 and 3 are inverting and non-inverting inputs; pin 4 is negative supply (ground on single supply); pin 6 is output; pin 7 is positive supply; pins 5 and 8 are NC.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed, rail-to-rail op-amp applications.

Compared with ADA4891-1ARJZ-R7 and LMH6612MA/NOPB, AD8031ANZ uniquely balances 80 MHz bandwidth, rail-to-rail I/O, 800 μA quiescent current, and PDIP packaging - making it the only choice for cost-sensitive, through-hole, battery-operated test equipment requiring guaranteed 0.1% settling in <130 ns.

Availability

AD8031ANZ is available at Aetrix Electronics and suitable for portable test instruments, high-density industrial data loggers, and medical biosignal acquisition systems requiring stable component supply and long-term obsolescence management.

Supply support for AD8031ANZ 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.

The AD8031 forms part of Analog Devices' precision high-speed op-amp product line, engineered specifically for low-power, rail-to-rail signal conditioning in battery-operated and space-constrained instrumentation systems.

FAQ

What supply voltage range does the AD8031ANZ support?

The AD8031ANZ operates from a single +2.7 V to +12 V supply or dual ±1.35 V to ±6 V supplies. It is fully specified at +2.7 V, +5 V, and ±5 V, with guaranteed 80 MHz bandwidth and 30 V/μs slew rate across this range. At +2.7 V, quiescent current is typically 800 μA, enabling extended battery life in portable applications without sacrificing speed.

Does the AD8031ANZ have rail-to-rail input and output capability?

Yes, the AD8031ANZ features true rail-to-rail input and output. Its input common-mode voltage range extends 200 mV beyond both supply rails (e.g., −0.2 V to +2.9 V on +2.7 V), and output swings to within 20 mV of either rail under light load (10 kΩ). This eliminates level-shifting circuitry in single-supply sensor interfaces and maximizes dynamic range in low-voltage data acquisition systems using AD8031ANZ.

What is the typical total harmonic distortion (THD) performance of the AD8031ANZ?

The AD8031ANZ achieves −62 dBc THD at 1 MHz with a 2 Vpp output and −86 dBc at 100 kHz with a 4.6 Vpp output on a +5 V supply. These values are measured under standard conditions (G = +2, RL = 1 kΩ) and reflect its suitability for high-fidelity applications such as active filters and A/D buffers where spectral purity is critical to maintain ENOB in the AD8031ANZ signal chain.

Can the AD8031ANZ drive capacitive loads, and what is its maximum stable load?

Yes, the AD8031ANZ is stable driving ≥15 pF capacitive loads at a noise gain of +2, as confirmed in Figure 46 of the Rev. G datasheet. This capability allows direct connection to ADC input capacitors (typically 10–20 pF) and long PCB traces without external isolation resistors - a key advantage over many high-speed op-amps that require >100 Ω series resistance for stability. The AD8031ANZ maintains phase margin >45° under these conditions.

What is the operating temperature range for the AD8031ANZ?

The AD8031ANZ is rated for the industrial temperature range of −40°C to +85°C. All specifications - including 80 MHz bandwidth, 30 V/μs slew rate, and rail-to-rail I/O performance - are guaranteed across this range. Thermal drift of input offset voltage is 5 µV/°C (typical), ensuring stable DC accuracy in unregulated environments where the AD8031ANZ is deployed in field instrumentation.