Analog Devices Inc./Maxim Integrated ICL7612DCSA

Overview

ICL7612DCSA from Maxim Integrated is a single-channel, ultra-low-input-bias-current CMOS operational amplifier with programmable quiescent current (10 μA/100 μA/1 mA), extended common-mode voltage range (±5.3 V at 10 μA), and 1 pA typical input bias current. It operates from ±1 V to ±8 V supplies or 2–16 V single supply, delivering rail-to-rail output swing within millivolts of rails - ideal for pH meter front-ends and picoammeter circuits.

For engineers reviewing the ICL7612DCSA datasheet, ICL7612DCSA pinout, ICL7612DCSA application, or ICL7612DCSA equivalent, this device is selected when sub-picoampere input leakage, wide supply flexibility, and user-selectable power/performance trade-offs are required in battery-powered instrumentation and high-impedance sensor interfaces.

Technical Context

The ICL7612DCSA implements a monolithic CMOS input stage with 10¹² Ω input impedance and 0.01 pA/√Hz input noise current, enabling stable operation with photodiode and glass-electrode sources. Its extended common-mode range (–1.1 V to +0.6 V relative to V– and V+, respectively, at IQ = 10 μA) supports direct interfacing to low-voltage transducers without level-shifting.

Quiescent current is set via the IOSET pin: tied to V+ for 10 μA, floating between V–+0.8 V and V+–0.8 V for 100 μA, or tied to V– for 1 mA. Bandwidth scales from 44 kHz to 1.4 MHz and slew rate from 16 mV/µs to 1.6 V/µs across these settings - all while maintaining <5 mV input offset voltage (D-grade).

Key Specifications

Pinout & Package

ICL7612DCSA uses an 8-pin Small Outline (SO) package (SA code), 3.9 mm × 4.9 mm body, 1.27 mm pitch, JEDEC MS-012AC compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LTC1050CS8#PBF and TLC27L2CDR, the ICL7612DCSA uniquely offers user-selectable quiescent current, extended negative common-mode range, and 1 pA typical input bias - making it the only choice for battery-powered, ground-referenced, ultra-high-impedance measurement systems requiring adaptive power scaling.

Availability

ICL7612DCSA is available at Aetrix Electronics and suitable for pH meters, photodiode amplifiers, picoammeters, low-droop sample/hold circuits, and battery-powered instrumentation requiring stable component supply across production lifecycles.

Supply support for ICL7612DCSA 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) designs precision analog, mixed-signal, and power-management ICs for industrial, medical, and communications applications.

The ICL761X family was engineered specifically for ultra-low-leakage, wide-supply, battery-operated instrumentation - prioritizing sub-picoampere input bias, rail-to-rail output, and flexible quiescent current control.

FAQ

What is the maximum supply voltage for the ICL7612DCSA?

The ICL7612DCSA supports a total supply voltage (V+ to V–) of up to +18 V. This allows operation from ±8 V dual supplies or 2–16 V single supplies. Absolute maximum ratings specify that exceeding +18 V may cause permanent damage, and input voltages must remain within (V+ + 0.3 V) to (V– – 0.3 V). The ICL7612DCSA is rated for continuous operation across its full specified supply range without derating.

How does the IOSET pin configure quiescent current in the ICL7612DCSA?

The IOSET pin on the ICL7612DCSA sets quiescent current in three discrete modes: connect to V+ for 10 μA, leave floating between V–+0.8 V and V+–0.8 V for 100 μA, or connect to V– for 1 mA. This configuration directly scales unity-gain bandwidth (44 kHz → 1.4 MHz), slew rate (16 mV/µs → 1.6 V/µs), and output sink current - while output source current remains constant. The ICL7612DCSA's IOSET functionality enables dynamic power/performance tuning without changing external components.

Does the ICL7612DCSA support true single-supply operation with inputs at ground potential?

Yes - the ICL7612DCSA features an extended common-mode voltage range of –1.1 V to +0.6 V relative to V– and V+, respectively, when configured for 10 μA quiescent current. With V– = 0 V (single-supply ground), this allows the –IN and +IN pins to accept signals down to –1.1 V, enabling direct interface to ground-referenced sensors like pH electrodes. This capability is unique to the ICL7612 and ICL7616 variants within the family and is confirmed in the Electrical Characteristics table on page 5 of the datasheet for the ICL7612DCSA.

What is the input offset voltage specification for the ICL7612DCSA?

The ICL7612DCSA is a D-grade device with a maximum input offset voltage (VOS) of 15 mV at +25°C and 20 mV across the full 0°C to +70°C operating temperature range. This is specified in the "Electrical Characteristics (Single/Dual)" table on page 4 of the datasheet under the ICL76XXD column. The ICL7612DCSA also supports external offset nulling via Pins 1 and 8, allowing reduction of VOS to <1 mV in precision applications - a feature not available in fixed-offset alternatives.

Can the ICL7612DCSA drive capacitive loads, and what is its stability behavior?

The ICL7612DCSA is internally compensated for unity-gain stability and can safely drive capacitive loads up to 100 pF without external compensation, as verified in the Typical Operating Characteristics (page 19) showing pulse response with CL = 100 pF. For loads >100 pF, a small series resistor (10–50 Ω) at the output is recommended to isolate capacitance from the amplifier's output stage. The ICL7612DCSA's CMOS output stage maintains phase margin >45° under all specified quiescent current settings and load conditions.