Analog Devices Inc. ADA4505-1ACBZ-R7

Overview

ADA4505-1ACBZ-R7 from Analog Devices is a single-channel, rail-to-rail input/output micropower operational amplifier optimized for ultra-low supply current (10 µA max), zero input crossover distortion, and high PSRR (100 dB min) in 1.8 V to 5 V single-supply systems. It delivers 3 mV max offset voltage, 0.5 pA typical input bias current, and operates across −40°C to +125°C - ideal for precision sensor front-ends in battery-constrained medical monitors and hazard detectors.

For engineers reviewing the ADA4505-1ACBZ-R7 datasheet, ADA4505-1ACBZ-R7 pinout, ADA4505-1ACBZ-R7 application, or ADA4505-1ACBZ-R7 equivalent, key selection criteria include its verified rail-to-rail I/O swing at sub-2 V operation, guaranteed PSRR/CMRR performance over temperature, low-frequency noise (2.95 µV p-p, 0.1–10 Hz), and compatibility with space-constrained SOT-23 layouts.

Technical Context

The ADA4505-1ACBZ-R7 employs an on-chip charge pump to power its CMOS input stage, eliminating crossover distortion without dual differential pairs - enabling seamless rail-to-rail common-mode input range (0 V to V_S) and stable offset behavior across full supply and temperature ranges. This architecture directly enables high CMRR (105 dB typ) and PSRR (100 dB min) even at 1.8 V.

It is unity-gain stable with 50 kHz gain-bandwidth product, 6.5 mV/µs slew rate, and 52° phase margin into 1 MΩ//20 pF loads. Its input resistance exceeds 220 GΩ and input capacitance is 2.5 pF (differential), supporting high-impedance sensor interfaces without stability compromise.

Key Specifications

Pinout & Package

The ADA4505-1ACBZ-R7 is packaged in a 5-lead SOT-23 (RJ-5) with exposed pad for thermal enhancement and standard footprint compatibility.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8505ACBZ-R7, ADA4505-1ACBZ-R7 trades slightly higher offset for superior PSRR and proven zero-crossover linearity; versus TSV911ICT, it delivers 3.8× lower supply current and eliminates rail-crossing distortion - making it the sole viable choice for precision, long-life battery systems.

Availability

ADA4505-1ACBZ-R7 is available at Aetrix Electronics and suitable for pressure and position sensors, medical monitors, hazard detectors, and battery-powered consumer equipment requiring stable component supply across industrial and extended temperature grades.

Supply support for ADA4505-1ACBZ-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The ADA4505-x family was engineered specifically for ultra-low-power, high-precision sensor signal conditioning in battery-operated medical, industrial, and safety-critical systems - emphasizing PSRR, CMRR, and distortion-free rail-to-rail operation at sub-2 V.

FAQ

What is the maximum supply voltage rating for the ADA4505-1ACBZ-R7?

The ADA4505-1ACBZ-R7 has an absolute maximum supply voltage rating of 5.5 V. Operation beyond this limit risks permanent damage. The device is specified for reliable operation from 1.8 V to 5 V single supply or ±0.9 V to ±2.5 V dual supply, with optimal PSRR and CMRR performance maintained across that full range. Always observe the 5.5 V absolute maximum to ensure long-term reliability of the ADA4505-1ACBZ-R7.

Does the ADA4505-1ACBZ-R7 require external compensation for unity-gain stability?

No, the ADA4505-1ACBZ-R7 is internally compensated and unity-gain stable. Its phase margin is guaranteed at 52° under standard test conditions (RL = 1 MΩ, CL = 20 pF, G = 1), and it drives capacitive loads up to 100 pF without oscillation when properly laid out. This eliminates the need for external compensation networks and simplifies design for the ADA4505-1ACBZ-R7 in sensor buffering and filtering applications.

What is the operating temperature range certified for the ADA4505-1ACBZ-R7?

ADA4505-1ACBZ-R7 is qualified for the extended industrial temperature range of −40°C to +125°C. This rating is fully tested and guaranteed per the datasheet's electrical characteristics tables, including parameters like supply current, offset voltage, PSRR, and CMRR. The wide range makes the ADA4505-1ACBZ-R7 suitable for under-hood automotive sensors, industrial fire detectors, and portable medical devices exposed to ambient extremes.

How does the charge pump in the ADA4505-1ACBZ-R7 eliminate crossover distortion?

The ADA4505-1ACBZ-R7 integrates an on-chip charge pump that generates a boosted internal voltage (~V_DD + 1.8 V) to bias its CMOS input differential pair. This allows the input stage to remain fully active across the entire 0 V to V_S common-mode range - eliminating the switching transition and associated distortion seen in dual-pair architectures. Verified by flat input offset voltage vs. common-mode plots (Figure 12), this ensures linear operation for the ADA4505-1ACBZ-R7 without performance gaps near supply rails.

Is the ADA4505-1ACBZ-R7 pin-compatible with other members of the ADA4505-x family?

No - the ADA4505-1ACBZ-R7 (5-lead SOT-23) is not pin-compatible with the dual ADA4505-2 or quad ADA4505-4 variants, which use 8-lead MSOP and 14-lead TSSOP packages respectively. Pinouts differ fundamentally: ADA4505-1ACBZ-R7 has dedicated V+, V–, +IN, –IN, and OUT pins in a 5-pin layout, whereas multi-channel versions share supply pins and require distinct PCB footprints. Always verify package and pin mapping before substituting any ADA4505-x variant, including the ADA4505-1ACBZ-R7.