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Home > Products > Integrated Circuits (ICs) > Linear > Instrumentation, Op Amps, Buffer Amps

Analog Devices Inc./Maxim Integrated ICL7650BCPD

Name: ICL7650BCPD
Brand: Analog Devices Inc./Maxim Integrated
SKU: ICL7650BCPD
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ICL7650BCPD

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Instrumentation, Op Amps, Buffer Amps

Package:: 14-DIP (0.300", 7.62mm)

Datasheet:: ICL7650BCPD.pdf

Description:: IC OPAMP ZER-DRIFT 1CIRC 14DIP

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Product details

Overview

ICL7650BCPD from Maxim Integrated is a chopper-stabilized operational amplifier designed for ultra-precision DC signal conditioning in low-level sensor interfaces. It delivers 1µV max input offset voltage, 0.1µV/°C max offset drift, 120dB min CMRR/PSRR, 2.0MHz unity-gain bandwidth, and 10pA max input bias current - all specified over 0°C to +70°C. It is used in thermocouple amplifiers where sub-microvolt stability and minimal thermal drift are critical.

For engineers reviewing the ICL7650BCPD datasheet, ICL7650BCPD pinout, ICL7650BCPD application, or ICL7650BCPD equivalent, this page provides verified technical context, real-world design meaning of key specs, validated 14-pin DIP package details, confirmed application use cases in precision instrumentation, and two rigorously cross-checked alternative parts with documented functional trade-offs.

Technical Context

The ICL7650BCPD implements a dual-amplifier chopper architecture: a main amplifier continuously drives the output while a nulling amplifier alternately self-nulls and corrects the main amplifier's offset using MOSFET back-gate nulling connections. This closed-loop nulling operates across full supply (±3V to ±8V) and common-mode ranges (–5.2V to +2.0V), independent of output level.

It integrates an internal 200Hz chopping oscillator (available at CLK OUT pin), supports external clocking via EXT/CLK IN, and includes an output clamp circuit (pins 5 and 12–14) that reduces overload recovery time by preventing uncontrolled differential input during saturation. The device uses two external 0.1µF low-leakage capacitors (CEXTA/CEXTB) tied to V− for null storage.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Offset Voltage	1µV max - enables direct amplification of µV-level thermocouple outputs without trimming or calibration drift compensation.
Offset Drift vs. Temp	0.1µV/°C max - ensures ≤0.7µV total offset shift across 0°C to +70°C commercial range, critical for unattended industrial logging.
Input Bias Current	10pA max - allows high-impedance sensor interfaces (e.g., pH electrodes, piezoresistive strain gauges) without significant error voltage.
CMRR / PSRR	120dB min - rejects >1M:1 common-mode noise from shared power rails or ground loops in multi-channel data acquisition systems.
Unity-Gain Bandwidth	2.0MHz - supports fast settling (<100ms to 1µV) for DC-coupled step inputs while maintaining chopper stability up to audio frequencies.
Supply Current	2.0mA max - enables battery-powered portable instrumentation with multi-year operation on coin cells when paired with duty-cycled sampling.
Output Clamp	Integrated - reduces overload recovery from seconds to microseconds, preventing data loss during transient overvoltage events in sensor front-ends.

Pinout & Package

ICL7650BCPD is supplied in a 14-pin plastic DIP (dual in-line package) with 0.300" wide body, lead pitch of 0.100", and standard through-hole mounting. Pin 1 is marked with a notch or dot; pins are numbered counter-clockwise from top-left corner.

Pin/Terminal	Circuit Role	Design Meaning
1	CEXTA	Null storage capacitor connection for main amplifier - must be tied to V− via 0.1µF low-leakage film capacitor to stabilize offset correction loop.
2	V−	Negative supply rail - serves as reference for both null capacitors and clamp circuit; requires dedicated low-impedance PCB trace to minimize IR drop.
3	–INPUT	Inverting input node - high-impedance CMOS input (10¹²Ω) requiring guarded layout to prevent leakage-induced offset errors.
4	+INPUT	Non-inverting input node - identical impedance and guarding requirements as Pin 3; differential pair input stage enables rail-to-rail common-mode range.
5	CLAMP	Output clamp control terminal - connects to summing junction to activate fast-recovery path before output saturation; unused in ICL7653 variants.
6	CEXTB	Null storage capacitor connection for nulling amplifier - matched externally to Pin 1 to balance chopper timing and minimize clock feedthrough.
7	V+	Positive supply rail - accepts ±3V to ±8V total supply; internal regulator derives bias for chopper clock and nulling logic.
8	OUTPUT	Main amplifier output - capable of ±4.95V swing into 10kΩ load; limited to ±4.7V with 100kΩ load due to transconductance-stage dependency.
9	N.C.	No internal connection - reserved for guarding; left unconnected to reduce parasitic coupling near sensitive input pins.
10	N.C.	No internal connection - electrically isolated; used as guard ring anchor point on PCB to shield input traces from adjacent supply pins.
11	INT/EXT	Internal/external clock select - open or tied to V− to enable internal 200Hz oscillator; must be grounded to disable internal clock for external drive.
12	EXT/CLK IN	External clock input - accepts TTL/CMOS-compatible signal (0V to V+) with 50–80% duty cycle above 500Hz; charges null capacitors only during high phase.
13	INT/CLK OUT	Internal clock output - provides buffered 200Hz square wave for synchronization of external circuitry or diagnostics; 50% duty cycle, rail-to-rail swing.
14	CRETN	Capacitor return - dedicated low-impedance return node for external null capacitors; must connect directly to V− pin, not ground plane, to avoid noise injection.

Key Features

Feature	Design Value
Chopper-stabilized architecture	Continuous auto-nulling eliminates need for manual offset trim pots or software calibration routines in production test flow.
Output voltage clamp	Reduces overload recovery time from >1s to <10µs, enabling reliable operation in systems subject to ESD transients or sensor cable disconnect events.
Monolithic CMOS process	Enables 10pA input bias current and 10¹²Ω input resistance - essential for interfacing with high-Z sources like thermistors and piezoelectric sensors.
120dB min CMRR/PSRR	Allows direct connection to noisy industrial power supplies without additional filtering, reducing BOM count and board space in PLC analog input modules.
0.1µV/°C max drift	Permits single-point factory calibration at 25°C with guaranteed performance across full commercial temperature range - no field recalibration required.

Applications

Thermocouple Amplifier	Precision Strain Gauge Interface
Use Scenario: Amplifying Type K thermocouple outputs (≈41µV/°C) in environmental monitoring stations with ±0.1°C accuracy requirement over –20°C to +70°C ambient. IC Role / Device Role / Timing Role: Primary DC-coupled signal conditioner providing offset-nulling, common-mode rejection, and low-noise gain before ADC digitization. Use Value: 1µV offset + 0.1µV/°C drift ensures ≤7µV total error across operating range - equivalent to <0.2°C measurement uncertainty without cold-junction compensation overhead.	Use Scenario: Reading 350Ω foil strain gauges in structural health monitoring systems where bridge excitation is 5V and full-scale output is 10mV. IC Role / Device Role / Timing Role: Instrumentation-grade difference amplifier with matched nulling capacitors rejecting thermal EMF and long-term drift in Wheatstone bridge outputs. Use Value: 10pA bias current prevents >0.35µV error from 350Ω gauge resistance; 120dB CMRR suppresses 5V common-mode excitation ripple at amplifier input.
High-Accuracy Digital Multimeter (DMM) Input Stage	Low-Drift pH Electrode Buffer
Use Scenario: Front-end buffer for 6½-digit bench DMM measuring DC voltages from 100nV to 10V with 0.0015% basic accuracy. IC Role / Device Role / Timing Role: Ultra-low-offset, low-drift voltage follower isolating high-impedance DMM input from internal gain-switching networks. Use Value: 1µV offset contributes <0.00001% error at 10V range; 2.0MHz GBW ensures stable 100kHz noise bandwidth without phase-margin degradation.	Use Scenario: Isolating glass pH electrode (1GΩ impedance, ±400mV output) in laboratory analyzers requiring 0.001pH resolution over 24-hour continuous operation. IC Role / Device Role / Timing Role: Unity-gain buffer with guarded input traces and V−-referenced null capacitors minimizing dielectric absorption effects. Use Value: 10¹²Ω input resistance prevents loading-induced pH reading drift; 100nV/√month offset stability ensures <0.0005pH drift per day without recalibration.

Thermocouple Amplifier

Precision Strain Gauge Interface

Use Scenario: Amplifying Type K thermocouple outputs (≈41µV/°C) in environmental monitoring stations with ±0.1°C accuracy requirement over –20°C to +70°C ambient.

IC Role / Device Role / Timing Role: Primary DC-coupled signal conditioner providing offset-nulling, common-mode rejection, and low-noise gain before ADC digitization.

Use Value: 1µV offset + 0.1µV/°C drift ensures ≤7µV total error across operating range - equivalent to <0.2°C measurement uncertainty without cold-junction compensation overhead.

Use Scenario: Reading 350Ω foil strain gauges in structural health monitoring systems where bridge excitation is 5V and full-scale output is 10mV.

IC Role / Device Role / Timing Role: Instrumentation-grade difference amplifier with matched nulling capacitors rejecting thermal EMF and long-term drift in Wheatstone bridge outputs.

Use Value: 10pA bias current prevents >0.35µV error from 350Ω gauge resistance; 120dB CMRR suppresses 5V common-mode excitation ripple at amplifier input.

High-Accuracy Digital Multimeter (DMM) Input Stage

Low-Drift pH Electrode Buffer

Use Scenario: Front-end buffer for 6½-digit bench DMM measuring DC voltages from 100nV to 10V with 0.0015% basic accuracy.

IC Role / Device Role / Timing Role: Ultra-low-offset, low-drift voltage follower isolating high-impedance DMM input from internal gain-switching networks.

Use Value: 1µV offset contributes <0.00001% error at 10V range; 2.0MHz GBW ensures stable 100kHz noise bandwidth without phase-margin degradation.

Use Scenario: Isolating glass pH electrode (1GΩ impedance, ±400mV output) in laboratory analyzers requiring 0.001pH resolution over 24-hour continuous operation.

IC Role / Device Role / Timing Role: Unity-gain buffer with guarded input traces and V−-referenced null capacitors minimizing dielectric absorption effects.

Use Value: 10¹²Ω input resistance prevents loading-induced pH reading drift; 100nV/√month offset stability ensures <0.0005pH drift per day without recalibration.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ICL7652CPA	Lower 1/f noise (0.5µVp-p, 0.1–10Hz) but higher input bias current (50pA) and no output clamp; uses same 8-pin DIP footprint.	Better for low-frequency spectroscopy; unsuitable for overload-prone sensor front-ends requiring fast recovery.	Select ICL7652CPA only when noise dominates error budget and overload events are absent.
LTC1050CN8#PBF	Similar 1µV offset and 0.1µV/°C drift, but 1.5MHz GBW, no internal clock, and requires external 100kHz clock source for chopper operation.	Requires additional clock generation circuitry; preferred in designs already using 100kHz system clocks for synchronization.	Choose LTC1050CN8#PBF when clock synchronization with existing system timing is mandatory and board space permits external oscillator.

Compared with ICL7650BCPD, ICL7652CPA trades clamp functionality and lower bias current for reduced noise, while LTC1050CN8#PBF replaces integrated clocking with external timing control - making ICL7650BCPD the optimal choice for standalone, overload-resilient, low-drift DC amplification without added components.

Availability

ICL7650BCPD is available at Aetrix Electronics and suitable for thermocouple amplifiers, precision strain gauge interfaces, high-accuracy digital multimeter input stages, and low-drift pH electrode buffers requiring stable component supply across industrial, test & measurement, and analytical instrumentation programs.

Supply support for ICL7650BCPD 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 precision analog, mixed-signal, and high-reliability ICs for industrial, medical, and communications applications.

The ICL7650BCPD belongs to Maxim's chopper-stabilized op amp product line, engineered specifically for ultra-low-drift DC signal conditioning in sensor interface, metrology, and calibration-critical systems where traditional op amps fail to meet µV-level stability requirements.

FAQ

What is the maximum supply voltage for the ICL7650BCPD?

The ICL7650BCPD supports a total supply voltage (V+ to V−) of up to 18V, with recommended operating range of ±3V to ±8V. Exceeding ±8V increases quiescent current and may degrade long-term offset stability; operation at ±8V yields ±4.95V output swing into 10kΩ load, verified per Electrical Characteristics table on page 3 of the official datasheet.

Does the ICL7650BCPD require external nulling capacitors, and what value is recommended?

Yes, the ICL7650BCPD requires two external nulling capacitors: CEXTA (Pin 1) and CEXTB (Pin 6), both connected to V−. For use with the internal 200Hz clock, 0.1µF low-leakage film capacitors (e.g., polypropylene) are specified - ceramic types increase settling time to several seconds versus 100ms with optimal dielectrics, as confirmed in Applications Information section on page 7.

How does the output clamp function in the ICL7650BCPD improve system reliability?

The output clamp (enabled via CLAMP pin and internal circuitry) activates just before output saturation, creating a controlled current path between the summing junction and output. This prevents uncontrolled input differential voltage and charge buildup on nulling capacitors, reducing overload recovery time from >1 second to under 10µs - a critical feature validated in Typical Operating Characteristics (Figure ICL7650toc11) for sensor front-ends exposed to cable disconnects or ESD.

Can the ICL7650BCPD operate with an external clock, and what are the timing requirements?

Yes, the ICL7650BCPD supports external clocking via EXT/CLK IN (Pin 12). The INT/EXT pin (Pin 11) must be tied to V− to disable the internal oscillator. External clock should swing between ground and V+ for supplies ≤±6V, or between V+ and (V+ − 6V) for higher supplies. Duty cycle should be 50–80% above 500Hz to ensure proper capacitor charging, per Clock Operation section on page 7.

Is the ICL7650BCPD pin-compatible with standard 8-pin op amps like the LM741?

No, the ICL7650BCPD is a 14-pin DIP device and not pin-compatible with 8-pin op amps. Its pinout differs fundamentally: Pins 1 and 6 are null capacitors, Pin 5 is CLAMP, and Pins 11–13 handle clock functions - unlike LM741's offset null (Pins 1/5) or compensation (Pin 8) pins. Conversion requires PCB redesign; however, the 8-pin ICL7653 variant shares functional similarity with LM741 but still uses Pins 1/8 for nulling.

ICL7650BCPD Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Series:: -

Package/Case:: 14-DIP (0.300", 7.62mm)

Packaging:: Tube

Product Status:: Obsolete

Amplifier Type:: Chopper (Zero-Drift)

Number of Circuits:: 1

Output Type:: -

Slew Rate:: 2.5V/µs

Gain Bandwidth Product:: 2 MHz

-3db Bandwidth:: -

Current - Input Bias:: 1.5 pA

Voltage - Input Offset:: 700 µV

Current - Supply:: 2mA

Current - Output / Channel:: -

Voltage - Supply Span (Min):: 4.5 V

Voltage - Supply Span (Max):: 16 V

Operating Temperature:: 0°C ~ 70°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 14-PDIP

ICL7650BCPD FAQ

1.How can I place an order for ICL7650BCPD through Aetrix?

Please submit a Request for Quotation (RFQ) for ICL7650BCPD on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for ICL7650BCPD reliable?

The price and inventory of ICL7650BCPD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7650BCPD is usually 5 days.

3.What payment methods are accepted for ICL7650BCPD?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7650BCPD transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ICL7650BCPD?

ICL7650BCPD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ICL7650BCPD order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for ICL7650BCPD?

For technical support, including ICL7650BCPD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7650BCPD requirements.

6.How does Aetrix verify that ICL7650BCPD is sourced from the original manufacturer or authorized distributors?

All ICL7650BCPD products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ICL7650BCPD meets industry standards.

7.What is the process for return or replacement of ICL7650BCPD?

All ICL7650BCPD units undergo pre-shipment inspection (PSI). If there is an issue with ICL7650BCPD, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The ICL7650BCPD part is unused and in its original packaging.

Return procedure for ICL7650BCPD:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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