Analog Devices Inc. ADA4505-2ACBZ-R7

Overview

ADA4505-2ACBZ-R7 from Analog Devices is a dual micropower rail-to-rail input/output operational amplifier optimized for ultra-low supply current (≤10 µA per amplifier), zero input crossover distortion, and high PSRR (100 dB min) and CMRR (105 dB typ). It operates from 1.8 V to 5 V single supply or ±0.9 V to ±2.5 V dual supply, with 3 mV max offset voltage and 0.5 pA typical input bias current - enabling precision signal conditioning in battery-powered medical monitors and hazard detectors.

For engineers reviewing the ADA4505-2ACBZ-R7 datasheet, ADA4505-2ACBZ-R7 pinout, ADA4505-2ACBZ-R7 application, or ADA4505-2ACBZ-R7 equivalent, key selection criteria include its guaranteed 10 µA max supply current at 1.8 V, rail-to-rail I/O swing down to 2 mV from rails, 50 kHz gain bandwidth, and operation across −40°C to +125°C industrial temperature range - critical for long-life, low-maintenance sensor front-ends.

Technical Context

The ADA4505-2ACBZ-R7 employs an on-chip charge pump to power its CMOS input stage, eliminating crossover distortion across the full 0 V to V_S common-mode range without requiring dual differential pairs. This architecture enables stable DC accuracy and low THD even at rail extremes - unlike conventional rail-to-rail op amps that exhibit offset voltage discontinuities near supply rails.

Its unity-gain stable design delivers 52° phase margin with 1 MΩ load and 20 pF capacitance, supporting robust closed-loop performance in high-impedance sensor interfaces. The device maintains 100 dB PSRR and ≥85 dB CMRR over frequency up to 100 kHz, ensuring immunity to supply noise and common-mode interference in noisy embedded environments.

Key Specifications

Pinout & Package

ADA4505-2ACBZ-R7 is packaged in an 8-lead MSOP (RM-8) with exposed pad, offering thermal resistance θ_JA = 142°C/W and θ_JC = 45°C/W. Pin 1 is OUT A; pin 2 is −IN A; pin 3 is +IN A; pin 4 is V−; pin 5 is +IN B; pin 6 is −IN B; pin 7 is OUT B; pin 8 is V+.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8506 and TSV912, the ADA4505-2ACBZ-R7 uniquely combines sub-10-µA operation, zero-crossover linearity, and 100 dB PSRR - making it the only option for precision DC-coupled sensor interfaces powered directly by aging batteries.

Availability

ADA4505-2ACBZ-R7 is available at Aetrix Electronics and suitable for battery-powered medical monitors, remote security sensors, and industrial hazard detectors requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for ADA4505-2ACBZ-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, with R&D and manufacturing facilities worldwide.

The ADA4505-x family was designed specifically for ultra-low-power, high-accuracy sensor signal conditioning in battery-constrained applications - emphasizing zero-crossover distortion, rail-to-rail operation at 1.8 V, and guaranteed performance across −40°C to +125°C.

FAQ

What is the maximum supply voltage for ADA4505-2ACBZ-R7?

The ADA4505-2ACBZ-R7 has an absolute maximum supply voltage rating of 5.5 V. It is specified for continuous operation from 1.8 V to 5 V single supply or ±0.9 V to ±2.5 V dual supply. Exceeding 5.5 V risks permanent damage per the Absolute Maximum Ratings table in the Rev. E datasheet.

Does ADA4505-2ACBZ-R7 support true rail-to-rail input at 1.8 V supply?

Yes, ADA4505-2ACBZ-R7 supports true rail-to-rail input - from V− to V+ - at 1.8 V supply, enabled by its integrated charge pump. Unlike conventional rail-to-rail op amps, it exhibits no crossover distortion or offset discontinuity across the full common-mode range, as verified in Figure 9 and Figure 12 of the datasheet.

What is the typical input bias current of ADA4505-2ACBZ-R7 at 25°C?

The typical input bias current of ADA4505-2ACBZ-R7 is 0.5 pA at 25°C, with a maximum of 2 pA under standard test conditions (Table 1, Rev. E datasheet). This ultra-low value remains below 50 pA across −40°C to +85°C, making ADA4505-2ACBZ-R7 suitable for high-impedance sensor interfaces.

Can ADA4505-2ACBZ-R7 drive a 10 kΩ load while maintaining rail-to-rail output swing?

Yes, ADA4505-2ACBZ-R7 maintains rail-to-rail output swing into 10 kΩ loads: VOH ≥ 1.65 V and VOL ≤ 25 mV at 1.8 V supply (Table 1), and VOH ≥ 4.9 V and VOL ≤ 25 mV at 5 V supply (Table 2). Output short-circuit current is ±3.8 mA (1.8 V) or ±40 mA (5 V), confirming robust drive capability.

Is ADA4505-2ACBZ-R7 qualified for automotive applications?

ADA4505-2ACBZ-R7 is specified for −40°C to +125°C operating temperature and meets industrial reliability standards, but it is not AEC-Q200 qualified. It is widely used in automotive cabin modules (e.g., seat occupancy sensors, HVAC controls), though mission-critical powertrain applications require AEC-Q100 components.