Analog Devices Inc. AD8548ARZ-RL

Overview

AD8548ARZ-RL from Analog Devices is a quad micropower rail-to-rail input/output (RRIO) CMOS operational amplifier optimized for low-power, wide-supply-voltage applications. It delivers 22 μA supply current per amplifier, 20 pA max input bias current, and 240 kHz gain bandwidth product at 18 V, enabling precision signal conditioning in battery-powered remote sensors and portable medical devices.

For engineers reviewing the AD8548ARZ-RL datasheet, AD8548ARZ-RL pinout, AD8548ARZ-RL application, or AD8548ARZ-RL equivalent, key selection criteria include its 2.7 V to 18 V single-supply operation, −40°C to +125°C extended temperature range, 110 dB large-signal voltage gain, and 90 dB EMI rejection ratio - critical for noise-sensitive analog front ends in industrial and medical instrumentation.

Technical Context

The AD8548ARZ-RL employs dual differential input pairs (NMOS and PMOS) to achieve true rail-to-rail input operation across its full common-mode range (0 V to V_S), with handoff behavior between pairs visible in V_OS vs. V_CM curves. Its output stage uses complementary MOS transistors to deliver rail-to-rail swing with <30 mV low output voltage (V_OL) at 100 kΩ load under 18 V supply.

Internal biasing includes a current-steering mechanism that shifts tail current from PMOS to NMOS input pairs as common-mode voltage rises, causing a measurable increase in supply current above 12 V_CM. Phase margin is fixed at 60°, ensuring unity-gain stability without external compensation across all supply voltages and loads up to 100 pF.

Key Specifications

Pinout & Package

AD8548ARZ-RL is housed in a 14-lead SOIC_N (Small Outline Integrated Circuit, Narrow) package with standard 1.27 mm pitch, 8.65 mm × 3.90 mm body dimensions, and exposed pad not present. Thermal resistance θ_JA = 115°C/W on 4-layer board.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar micropower op amp applications.

Compared with AD8504ARZ-REEL7 and OP481ARZ-REEL7, the AD8548ARZ-RL uniquely balances 22 μA ultra-low power, 18 V operation, and 240 kHz bandwidth - making it the only quad op amp in its class capable of driving 4–20 mA loops while maintaining nanoscale input bias for high-Z sensors.

Availability

AD8548ARZ-RL is available at Aetrix Electronics and suitable for portable medical equipment, remote environmental sensors, and 4–20 mA process control systems requiring stable component supply across long production lifecycles.

Supply support for AD8548ARZ-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.

The AD854x family was designed specifically for micropower, wide-supply, rail-to-rail precision amplification in battery-constrained and harsh-environment applications - emphasizing input bias current, EMI resilience, and extended temperature operation over raw speed.

FAQ

What is the maximum supply voltage rating for the AD8548ARZ-RL?

The AD8548ARZ-RL has an absolute maximum supply voltage rating of 20.5 V. Continuous operation is specified from 2.7 V to 18 V for single-supply use and ±1.35 V to ±9 V for dual-supply configurations. Exceeding 18 V in normal operation risks parametric degradation, while transient spikes above 20.5 V may cause permanent damage per the Absolute Maximum Ratings table.

Does the AD8548ARZ-RL support true rail-to-rail input at 2.7 V supply?

Yes, the AD8548ARZ-RL maintains rail-to-rail input operation down to 2.7 V supply, with input voltage range specified as 0 V to 2.7 V. At this voltage, common-mode rejection remains ≥60 dB and input bias current stays ≤10 pA typical, enabling accurate DC coupling in low-voltage portable systems without external level shifting.

How does the AD8548ARZ-RL handle electromagnetic interference in noisy industrial environments?

The AD8548ARZ-RL features a documented 90 dB EMI rejection ratio at 400 MHz, 900 MHz, 1800 MHz, and 2400 MHz frequencies. This is achieved through proprietary input-stage filtering and internal bias network hardening - allowing direct use in PLCs, motor drives, and wireless gateways without external ferrite beads or RC filters.

Can the AD8548ARZ-RL drive capacitive loads up to 100 pF without oscillation?

Yes, the AD8548ARZ-RL is unity-gain stable and characterized for safe operation with capacitive loads up to 100 pF, as confirmed in Figures 35 and 38 of the datasheet. Its 60° phase margin and controlled output impedance ensure monotonic settling and <5% overshoot even with 100 pF directly on the output pin.

What is the guaranteed input offset voltage specification for AD8548ARZ-RL over temperature?

The AD8548ARZ-RL guarantees a maximum input offset voltage of 12 mV over the full operating temperature range of −40°C to +125°C and supply range of 2.7 V to 18 V. This value is tested and binned during production, and applies regardless of common-mode voltage within the specified input range.