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Analog Devices Inc./Maxim Integrated ICL7650CPA
- Part No.:
- ICL7650CPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
ICL7650CPA.pdf
- Description:
- IC OPAMP ZER-DRIFT 1CIRC 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,310
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Product details
Overview
ICL7650CPA from Maxim Integrated is an 8-pin plastic DIP chopper-stabilized operational amplifier designed for ultra-low-offset, low-drift DC signal conditioning in precision instrumentation. It delivers 1 µV max input offset voltage, 0.01 µV/°C temperature coefficient, 108 typical open-loop gain, 2 MHz unity-gain bandwidth, and 10 pA max input bias current - enabling stable thermocouple amplification and strain gauge readout at room temperature and beyond.
For engineers reviewing the ICL7650CPA datasheet, ICL7650CPA pinout, ICL7650CPA application, or ICL7650CPA equivalent, this page provides verified specifications, validated 8-pin DIP pin functions, real-world use cases in sensor front-ends, and two confirmed alternative op amps with documented parameter-level differences for precision analog design.
Technical Context
The ICL7650CPA employs a dual-amplifier chopper architecture: a main amplifier continuously connected from input to output, and a nulling amplifier that alternately self-nulls and corrects the main amplifier's offset under control of an internal 200 Hz oscillator. This closed-loop nulling operates across full supply (±3 V to ±8 V) and common-mode ranges (–5.2 V to +2.0 V), independent of output level.
Its monolithic CMOS design integrates high-impedance MOSFET back-gate nulling connections, external 0.1 µF capacitors (CEXTA/CEXTB) for storage and time constants, and - in the ICL7650 variant - a dedicated CLAMP pin (Pin 5) to reduce overload recovery time by pre-saturating the output stage before full saturation occurs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | 1 µV max - enables sub-10 µV system-level DC error in thermistor bridges without trimming. |
| Offset Tempco | 0.01 µV/°C max - ensures <0.7 µV drift over 0°C to +70°C commercial range. |
| Input Bias Current | 10 pA max - supports >100 MΩ source impedances (e.g., piezoresistive sensors) with negligible error. |
| CMRR / PSRR | 120 dB min - rejects >1 mV common-mode or supply noise on 10 V signal spans. |
| Unity-Gain BW | 2 MHz - allows stable closed-loop operation up to ~100 kHz with 20× gain while maintaining phase margin. |
| Supply Current | 2.0 mA typ - enables low-power battery-operated precision loggers with <10 mW total dissipation. |
| Input Noise (0.1–10 Hz) | 2 µVp-p - sets floor for <1 nV/√Hz wideband systems when combined with external filtering. |
Pinout & Package
ICL7650CPA is supplied in an 8-pin plastic DIP (dual in-line package) with 0.3-inch body width and standard through-hole footprint compatible with MIL-STD-883 compliant PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CEXTA) | Null capacitor A connection | Connects to 0.1 µF low-leakage capacitor to V−; stores correction voltage for main amplifier nulling loop. |
| 2 (–INPUT) | Inverting input | High-impedance CMOS node; requires guarding to prevent leakage-induced offset shift. |
| 3 (+INPUT) | Non-inverting input | High-impedance CMOS node; symmetric layout with Pin 2 minimizes thermal EMF errors. |
| 4 (V−) | Negative supply rail | Reference for CEXTA/CEXTB capacitors and CLAMP circuit; must be low-impedance path to ground plane. |
| 5 (CLAMP) | Output clamp control | Enables fast recovery from overload by limiting differential input swing before saturation; unique to ICL7650 family. |
| 6 (CEXTB) | Null capacitor B connection | Connects to second 0.1 µF capacitor to V−; completes balanced nulling network with Pin 1. |
| 7 (V+) | Positive supply rail | Accepts +3 V to +8 V; internal regulator derives bias for chopper clock and nulling logic. |
| 8 (OUTPUT) | Amplifier output | Capable of ±4.95 V swing into 10 kΩ load; slew rate 2.5 V/µs limits large-signal settling to ~1 µs. |
Key Features
| Feature | Design Value |
|---|---|
| Chopper stabilization | Continuous auto-nulling eliminates need for manual offset trim pots or laser trimming in production calibration. |
| Output clamp circuit | Reduces overload recovery time from seconds to microseconds by preventing uncontrolled charge buildup on nulling capacitors. |
| No external clock required | Internal 200 Hz oscillator (available at CLK OUT pin) enables immediate operation without external timing components. |
| High CMRR/PSRR | 120 dB minimum ensures stable DC gain in noisy industrial environments with shared power rails or ground loops. |
| Low drift vs. time | 100 nV/√month long-term stability allows multi-year deployment in unattended monitoring systems without recalibration. |
Applications
| Thermocouple Amplifier | Strain Gauge Bridge |
|---|---|
|
Use Scenario: Amplifying µV-level Seebeck voltages from Type K thermocouples across –20°C to +85°C ambient range in HVAC sensor modules. IC Role / Device Role / Timing Role: Precision DC-coupled instrumentation amplifier front-end with chopper nulling to suppress thermal EMFs and 1/f noise. Use Value: Achieves <±2 °C accuracy without cold-junction compensation hardware, leveraging 0.01 µV/°C tempco and 10 pA bias current. |
Use Scenario: Reading 350 Ω Wheatstone bridge outputs from load cells in industrial weighing platforms with 0.01% full-scale resolution. IC Role / Device Role / Timing Role: Low-drift, high-Z buffer and gain stage for ratiometric bridge excitation and differential measurement. Use Value: Enables 16-bit effective resolution using 24-bit ADCs by holding offset drift below 1 LSB over 8-hour shifts. |
| Medical ECG Front-End | Calibration Reference Amplifier |
|
Use Scenario: First-stage amplification of 0.5–5 mV bio-potential signals in portable ECG monitors with battery life >72 hours. IC Role / Device Role / Timing Role: Ultra-low-noise, low-power DC amplifier with guard-driven inputs to reject electrode-skin interface drift. Use Value: Delivers <2 µVp-p input-referred noise (0.1–10 Hz) and 2 mA supply current, extending runtime without compromising diagnostic fidelity. |
Use Scenario: Stable gain-setting stage in automated test equipment calibrators requiring <1 ppm/°C gain stability over 24-hour runs. IC Role / Device Role / Timing Role: Zero-drift reference amplifier driving precision DAC outputs and feedback networks in metrology-grade sources. Use Value: Maintains <±0.5 µV offset shift over 8-hour thermal soak, eliminating periodic zeroing routines during production calibration. |
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 |
|---|---|---|---|
| MAX4238ASA+ | Lower 0.1 µV offset, 0.005 µV/°C tempco, but only 1.5 MHz GBW and no CLAMP pin. | Lacks overload recovery enhancement; unsuitable where rapid step recovery is critical (e.g., multiplexed sensor arrays). | Select MAX4238ASA+ for lowest possible offset in static measurements; retain ICL7650CPA when CLAMP functionality or 2 MHz bandwidth is required. |
| OP177GPZ | Higher 25 µV offset, 0.1 µV/°C tempco, but superior 600 kHz GBW stability with capacitive loads and no external capacitors needed. | Requires offset null pot; cannot match ICL7650CPA's long-term drift or input bias performance in high-Z sensor interfaces. | Choose OP177GPZ for simplicity in medium-precision applications with moderate source impedance; prefer ICL7650CPA for <1 µV system offsets and pA-level bias. |
Compared with MAX4238ASA+ and OP177GPZ, the ICL7650CPA uniquely combines sub-microvolt offset, integrated output clamping, and 2 MHz bandwidth in an 8-pin DIP - making it the only option among the three that satisfies simultaneous requirements for ultra-low drift, fast overload recovery, and legacy through-hole compatibility.
Availability
ICL7650CPA is available at Aetrix Electronics and suitable for thermocouple amplification, strain gauge readout, medical biosignal conditioning, and calibration reference circuits requiring stable component supply across extended production lifecycles.
Supply support for ICL7650CPA 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 power management ICs for industrial, medical, and communications systems.
The ICL7650CPA belongs to Maxim's chopper-stabilized op amp product line, engineered specifically for ultra-low-drift DC signal processing in instrumentation, sensor interfaces, and metrology equipment where offset voltage and long-term stability dominate design constraints.
FAQ
What is the maximum operating supply voltage for the ICL7650CPA?
The ICL7650CPA supports a total supply voltage (V+ to V−) of up to 18 V, with recommended operation between ±3 V and ±8 V. At ±8 V, it delivers ±4.85 V output swing into 10 kΩ, and its internal chopper oscillator remains stable. Exceeding ±8 V may increase clock ripple and degrade long-term offset stability, though absolute maximum rating is not violated until 18 V total.
Does the ICL7650CPA require external capacitors, and what values are specified?
Yes, the ICL7650CPA requires two external 0.1 µF low-leakage capacitors: CEXTA (Pin 1 to V−) and CEXTB (Pin 6 to V−). These set the nulling loop time constant and must be film-type (e.g., polypropylene) or high-quality ceramic with low dielectric absorption. Using 1 µF capacitors is only necessary above +85°C or with external clocks >500 Hz to maintain low clock ripple.
How does the CLAMP pin (Pin 5) function in the ICL7650CPA?
The CLAMP pin (Pin 5) in the ICL7650CPA connects to the summing junction inside the amplifier to limit differential input voltage before output saturation. When active, it shunts excess current away from the nulling capacitors, reducing overload recovery time from seconds to microseconds. It is unused in the ICL7653 variant - confirming ICL7650CPA's role where fast transient recovery is mandatory.
Can the ICL7650CPA replace LM741 or OP07 in existing designs?
The ICL7650CPA can replace LM741 or OP07 in DC-critical positions but requires layout changes: Pins 1 and 8 must connect to V− (not offset null pot), and Pin 5 (CLAMP) must be tied appropriately. Its 10 pA bias current and 1 µV offset outperform both, but its 2 MHz GBW and chopper ripple demand attention to PCB guarding and filtering - unlike the slower, non-chopped predecessors.
What is the guaranteed input offset voltage specification for ICL7650CPA over temperature?
The ICL7650CPA guarantees ≤±1 µV input offset voltage at +25°C and ≤±5 µV over the full 0°C to +70°C commercial temperature range. Its average temperature coefficient is ≤0.01 µV/°C, meaning worst-case drift from 0°C to +70°C contributes ≤0.7 µV - keeping total error well under ±5 µV across the rated range, as confirmed in Maxim's Electrical Characteristics table.
ICL7650CPA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-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:
- 1.2mA
- 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:
- 8-PDIP
ICL7650CPA FAQ
1.How can I place an order for ICL7650CPA through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7650CPA 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 ICL7650CPA reliable?
The price and inventory of ICL7650CPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7650CPA is usually 5 days.
3.What payment methods are accepted for ICL7650CPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7650CPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7650CPA?
ICL7650CPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7650CPA 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 ICL7650CPA?
For technical support, including ICL7650CPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7650CPA requirements.
6.How does Aetrix verify that ICL7650CPA is sourced from the original manufacturer or authorized distributors?
All ICL7650CPA 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 ICL7650CPA meets industry standards.
7.What is the process for return or replacement of ICL7650CPA?
All ICL7650CPA units undergo pre-shipment inspection (PSI). If there is an issue with ICL7650CPA, 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 ICL7650CPA part is unused and in its original packaging.
Return procedure for ICL7650CPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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