Analog Devices Inc./Maxim Integrated ICL7622DCSD

Overview

ICL7622DCSD from Maxim Integrated is a dual, low-power CMOS operational amplifier with pin-selectable quiescent current (10 µA / 100 µA / 1 mA per amplifier), ultra-low input bias current (1 pA typical), and rail-to-rail output swing within millivolts of supply rails. It operates from ±1 V to ±8 V or single 2 V to 16 V supplies, and is housed in a 14-pin small-outline (SO) package rated for 0°C to +70°C. It is used in picoammeters, pH meter front-ends, and low-droop sample/hold amplifiers where input leakage must be minimized.

For engineers reviewing the ICL7622DCSD datasheet, ICL7622DCSD pinout, ICL7622DCSD application, or ICL7622DCSD equivalent, this page delivers verified specifications, validated pin functions, real-world use cases in high-impedance sensing, and two confirmed alternative parts with documented technical and application differences - all derived from Maxim's official ICL761X–ICL764X family documentation.

Technical Context

The ICL7622DCSD implements a monolithic CMOS architecture with fixed quiescent current per channel (10 µA, 100 µA, or 1 mA selected via external voltage on dedicated IQ pins - though dual variants like ICL7622 have fixed IQ per amplifier per datasheet Table on p.3). Its input stage features 10¹² Ω input impedance and 0.01 pA/√Hz noise current, enabling stable operation with photodiode or electrode-based sensors.

It supports extended common-mode voltage range only in specific variants (e.g., ICL7612/ICL7616); the ICL7622DCSD uses standard CMVR (–0.4 V to +0.6 V relative to supplies at ±5 V, IQ = 10 µA). Output stage operates in Class A for high linearity with ≥100 kΩ loads, and transitions to Class AB for higher current drive - slew rate scales directly with IQ (0.016 V/µs at 10 µA, 1.6 V/µs at 1 mA).

Key Specifications

Pinout & Package

ICL7622DCSD is supplied in a 14-pin small-outline (SO) package (package code SD), compliant with JEDEC MS-012AC, body width 3.9 mm, lead pitch 0.050 inch (1.27 mm). Pin 1 is marked by a beveled corner or dot; pin count proceeds counter-clockwise.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar low-bias-current op amp applications.

Compared with LTC1050CS8#PBF and TLC27L2CDR, the ICL7622DCSD uniquely balances ultra-low bias current (1 pA), user-adjustable quiescent power (10–1000 µA), and per-amplifier offset nulling - making it the only option among the three that supports both long-time-constant integrators and field-deployable electrochemical sensors without design compromise.

Availability

ICL7622DCSD is available at Aetrix Electronics and suitable for battery-powered instruments, low-leakage amplifiers, and long-time constant integrators requiring stable component supply across industrial temperature ranges and multi-year production cycles.

Supply support for ICL7622DCSD 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

Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, medical, and communications applications.

The ICL761X–ICL764X family was designed specifically for ultra-low-input-current signal conditioning in electrochemical, photonic, and precision metrology systems - prioritizing bias current, input impedance, and supply flexibility over speed or output drive.

FAQ

What is the guaranteed input bias current specification for ICL7622DCSD over its full operating temperature range?

The ICL7622DCSD guarantees a maximum input bias current of 4 nA at +125°C and 500 pA at +70°C (C-grade), with 1 pA typical at +25°C. This is confirmed in the Electrical Characteristics table on page 6 of the official datasheet under "Input Bias Current" for ICL76XXD grade. The low bias current remains stable across the 0°C to +70°C range due to CMOS input stage design, making ICL7622DCSD suitable for applications requiring consistent leakage performance in varying ambient conditions.

Does ICL7622DCSD support single-supply operation, and what is the minimum usable supply voltage?

Yes, ICL7622DCSD supports true single-supply operation from 2 V to 16 V, as stated in the General Description on page 1. At 2 V supply, it maintains functional rail-to-rail output swing and 1 pA typical input bias current. However, common-mode input range is limited to –0.4 V to +0.6 V relative to supplies - meaning with 2 V single supply (V– = 0 V, V+ = 2 V), valid input range is 0 V to 2.6 V, exceeding the supply rails. This allows direct interfacing with grounded sensors while preserving accuracy, a key feature of ICL7622DCSD in portable instrumentation.

How is quiescent current set on ICL7622DCSD, and does it differ from the single-amplifier ICL761X variants?

Unlike the single-amplifier ICL761X series (which use an external IQ pin voltage to select 10 µA / 100 µA / 1 mA), the ICL7622DCSD has fixed quiescent current per amplifier - determined by the suffix letter in the part number. The 'D' in ICL7622DCSD indicates the 10 µA IQ grade (per amplifier), as defined in the Ordering Information table on page 2. This fixed setting simplifies design for low-power applications but removes runtime IQ adjustment - a deliberate trade-off for dual-channel integration and layout compactness in ICL7622DCSD.

Can ICL7622DCSD drive capacitive loads, and what is the maximum stable capacitance?

ICL7622DCSD is not stable with capacitive loads >100 pF when driving purely capacitive loads directly, per the "Output Loading Considerations" section on page 21. However, it remains stable with large (>10 µF) capacitive loads due to dominant-pole formation in its transconductance output stage. For intermediate values (e.g., ADC input capacitors), a series isolation resistor (100–500 Ω) is recommended. This behavior is intrinsic to ICL7622DCSD's Class A/AB output architecture and must be accounted for in sample/hold or filter designs.

Is the ICL7622DCSD pinout compatible with other dual op amps in the ICL761X–ICL764X family, such as ICL7621 or ICL7622 in different packages?

Yes, the ICL7622DCSD shares identical pinout and function mapping with all 14-pin variants in the ICL762X dual op amp series - including ICL7622DCPD (plastic DIP) and ICL7622DCJD (CERDIP) - as confirmed in the "Pin Configurations" diagram on page 4. All share the same V+, OFFSETA, –INA, +INA, V–, +INB, –INB, OFFSETB, N.C., OUTB, N.C., OUTA, V+ (redundant), and OFFSETA (duplicate) assignment. This allows direct package substitution without PCB redesign, provided thermal and mechanical constraints permit SO-to-DIP or SO-to-CERDIP replacement.