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Analog Devices Inc./Maxim Integrated ICL7650CSA+
- Part No.:
- ICL7650CSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ICL7650CSA+.pdf
- Description:
- IC OPAMP ZER-DRIFT 1CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,182
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Product details
Overview
ICL7650CSA+ from Maxim Integrated is a chopper-stabilized operational amplifier designed for ultra-precision DC signal conditioning in low-level sensor interfaces. It delivers 1 µV max input offset voltage, 0.01 µV/°C max offset drift, 108 min open-loop gain, 2 MHz unity-gain bandwidth, and 1012 Ω input resistance - enabling stable thermocouple amplification and strain gauge readout at room temperature and beyond.
For engineers reviewing the ICL7650CSA+ datasheet, ICL7650CSA+ pinout, ICL7650CSA+ application, or ICL7650CSA+ equivalent, this page provides verified specifications, SOIC-8 package layout, real-world use cases in instrumentation, and two validated alternative op amps with documented functional trade-offs.
Technical Context
The ICL7650CSA+ implements 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 using MOSFET back-gate switching. 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 internal 200 Hz chopping frequency (available at CLK OUT pin) drives external 0.1 µF nulling capacitors (CEXTA/CEXTB) connected to pins 1 and 8. Unlike the ICL7653, the ICL7650CSA+ includes a dedicated CLAMP pin (Pin 5) for active overload recovery, reducing saturation recovery time without compromising DC precision.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | 1 µV max - enables sub-µV DC error in high-gain sensor front-ends without trimming. |
| Offset Drift vs. Temp | 0.01 µV/°C max - ensures <1 µV total drift over 0°C to +70°C commercial range. |
| Input Bias Current | 10 pA max - supports high-impedance sources (e.g., pH electrodes, piezoresistive sensors) without loading error. |
| CMRR / PSRR | 120 dB min - rejects power supply ripple and common-mode interference in noisy industrial environments. |
| Unity-Gain Bandwidth | 2 MHz - allows stable closed-loop operation up to ~100 kHz with 20× gain while maintaining phase margin. |
| Supply Current | 2.0 mA max - enables low-power precision amplification in battery-backed instrumentation. |
| Input Resistance | 1012 Ω - preserves signal integrity from megohm-level transducer sources. |
Pinout & Package
ICL7650CSA+ is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package with gull-wing leads, 1.27 mm pitch, and JEDEC MS-012AC compliance. Pin 1 is marked by a beveled corner or dot; thermal pad is not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CEXTA) | Nulling capacitor A connection | Stores correction voltage for main amplifier; must connect 0.1 µF low-leakage capacitor to V−. |
| 2 (–INPUT) | Inverting input terminal | Differential input node; requires guarding to suppress leakage-induced offset errors. |
| 3 (+INPUT) | Non-inverting input terminal | Differential input node; same guarding requirements as Pin 2. |
| 4 (V−) | Negative supply rail | Reference for nulling capacitors and CLAMP circuit; must route separately to minimize IR drop. |
| 5 (CLAMP) | Output clamp control | Enables fast overload recovery by limiting differential input swing before saturation. |
| 6 (OUTPUT) | Amplifier output | Capable of ±4.7 V swing into 10 kΩ load with ±5 V supplies; slew rate = 2.5 V/µs. |
| 7 (V+) | Positive supply rail | Accepts +3 V to +8 V; internal pull-up on INT/EXT pin enables default internal clock operation. |
| 8 (CEXTB) | Nulling capacitor B connection | Completes nulling loop; matched 0.1 µF capacitor required for stable offset cancellation. |
Key Features
| Feature | Design Value |
|---|---|
| Chopper-stabilized architecture | Continuous auto-nulling eliminates need for manual offset trim and maintains <1 µV stability over time and temperature. |
| Output clamp circuit | Reduces overload recovery time by >90% versus unclamped chopper op amps, critical for step-response-critical systems. |
| Ultra-low input bias current | 10 pA max enables direct interfacing with high-Z sources (e.g., thermistors, glass pH electrodes) without guard-ring PCB complexity. |
| High CMRR/PSRR | 120 dB min ensures accurate DC measurement in presence of 60 Hz line noise or switching regulator ripple. |
| SOIC-8 footprint compatibility | Replaces legacy 8-pin op amps (e.g., LM741, OP07) in existing layouts when external nulling caps are added to Pins 1 & 8. |
Applications
| Thermocouple Amplification | Strain Gauge Signal Conditioning |
|---|---|
|
Use Scenario: Amplifying µV-level Seebeck voltages from Type K thermocouples across –200°C to +1350°C, with cold-junction compensation. IC Role / Device Role / Timing Role: Precision DC amplifier providing gain ≥1000 with <1 µV total input-referred offset error and minimal drift over ambient temperature swings. Use Value: Enables 0.1°C resolution without calibration drift, leveraging 0.01 µV/°C offset coefficient and 120 dB CMRR to reject thermocouple lead noise. |
Use Scenario: Reading Wheatstone bridge outputs from metal foil strain gauges in load cells and pressure transducers. IC Role / Device Role / Timing Role: Low-drift, low-bias-current instrumentation amplifier front-end driving ADC reference buffers. Use Value: Maintains bridge balance accuracy under thermal cycling; 10 pA bias current prevents >1 mΩ effective shunt error in 120 Ω gauges. |
| Precision Digital Multimeter (DMM) Input Stage | Low-Drift Reference Buffer |
|
Use Scenario: DC voltage measurement path in handheld DMMs requiring 6½-digit resolution and auto-zero capability. IC Role / Device Role / Timing Role: Auto-zeroing buffer stage preceding integrating ADC, rejecting 1/f noise and supply ripple. Use Value: Achieves <1 ppm linearity error over 1-year period via <100 nV/√month long-term offset stability and 2 MHz GBW for fast settling. |
Use Scenario: Buffering ultra-stable voltage references (e.g., LTZ1000, REF5050) in calibration equipment and metrology systems. IC Role / Device Role / Timing Role: Unity-gain follower isolating reference from load variations while preserving ppm-level DC accuracy. Use Value: 1012 Ω input resistance prevents reference loading; 1 µV offset avoids introducing measurable error into 5 V references. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision chopper-stabilized op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4238ASA+ | Lower 0.5 µV offset, 0.005 µV/°C drift, but only 1.5 MHz GBW and no CLAMP pin. | Lacks output clamping; unsuitable for fast-recovery overload scenarios like relay contact bounce detection. | Select MAX4238ASA+ when ultimate DC stability is prioritized over transient recovery speed. |
| OPA189IDBVR | Zero-drift architecture (auto-zero), 0.005 µV/°C drift, 10 MHz GBW, but 25 pA bias current and no CLAMP. | Higher bandwidth suits AC-coupled sensor paths; higher bias current limits use with >100 MΩ sources. | Choose OPA189IDBVR for mixed-signal systems needing both precision DC and wideband AC response. |
Compared with MAX4238ASA+ and OPA189IDBVR, the ICL7650CSA+ uniquely combines sub-µV offset, ultra-low drift, integrated output clamping, and SOIC-8 compatibility - making it the only option among the three qualified for overload-prone, high-impedance, purely DC-critical applications such as thermocouple scanners and metrology-grade integrators.
Availability
ICL7650CSA+ is available at Aetrix Electronics and suitable for precision instrumentation, industrial sensor interfaces, and calibration equipment requiring stable component supply across extended product lifecycles.
Supply support for ICL7650CSA+ 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 high-performance analog and mixed-signal ICs for precision, power, and interface applications.
The ICL7650CSA+ belongs to Maxim's chopper-stabilized op amp family, engineered specifically for ultra-low-drift DC amplification in scientific instruments, test equipment, and process control systems where offset stability dominates performance requirements.
FAQ
What is the maximum operating supply voltage for the ICL7650CSA+?
The ICL7650CSA+ supports a total supply voltage (V+ to V−) of up to 18 V, with recommended operation between ±3 V and ±8 V. Absolute maximum ratings specify ±9 V per rail; exceeding ±8 V increases clock ripple and may degrade long-term offset stability due to increased capacitor leakage currents.
Does the ICL7650CSA+ require external nulling capacitors, and what value is specified?
Yes, the ICL7650CSA+ requires two external nulling capacitors: 0.1 µF low-leakage film (e.g., polypropylene) capacitors connected from Pins 1 (CEXTA) and 8 (CEXTB) to V−. These set the nulling time constant and must match within 1% to prevent residual offset; ceramic capacitors are discouraged due to dielectric absorption effects.
How does the CLAMP pin (Pin 5) function in the ICL7650CSA+?
The CLAMP pin in the ICL7650CSA+ connects to the summing junction inside the amplifier to limit differential input voltage during overload. When activated, it prevents uncontrolled charge buildup on nulling capacitors, reducing recovery time from saturation to <10 µs - a feature absent in the pin-compatible ICL7653CSA+.
Can the ICL7650CSA+ operate with an external clock, and what are the requirements?
Yes, the ICL7650CSA+ supports external clocking via the EXT/CLK IN pin (Pin 13 in 14-pin versions; not available in SOIC-8 ICL7650CSA+). For the SOIC-8 variant, only internal 200 Hz clocking is supported. External clocking requires tying INT/EXT (Pin 12) to V− and applying a 50–80% duty-cycle square wave between V+ and (V+ − 6 V) for supplies >±6 V.
Is the ICL7650CSA+ pin-compatible with standard 8-pin op amps like the LM741?
The ICL7650CSA+ shares the same 8-pin SOIC footprint as the LM741, but Pin 1 (CEXTA) and Pin 8 (CEXTB) are used for nulling capacitors instead of offset null or NC. Direct replacement requires adding 0.1 µF capacitors to V− and verifying CLAMP functionality; unused pins on legacy op amps must remain unconnected or grounded per design.
ICL7650CSA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ICL7650CSA+ FAQ
1.How can I place an order for ICL7650CSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7650CSA+ 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 ICL7650CSA+ reliable?
The price and inventory of ICL7650CSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7650CSA+ is usually 5 days.
3.What payment methods are accepted for ICL7650CSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7650CSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7650CSA+?
ICL7650CSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7650CSA+ 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 ICL7650CSA+?
For technical support, including ICL7650CSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7650CSA+ requirements.
6.How does Aetrix verify that ICL7650CSA+ is sourced from the original manufacturer or authorized distributors?
All ICL7650CSA+ 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 ICL7650CSA+ meets industry standards.
7.What is the process for return or replacement of ICL7650CSA+?
All ICL7650CSA+ units undergo pre-shipment inspection (PSI). If there is an issue with ICL7650CSA+, 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 ICL7650CSA+ part is unused and in its original packaging.
Return procedure for ICL7650CSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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