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Analog Devices Inc./Maxim Integrated ICL7650CSD+
- Part No.:
- ICL7650CSD+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ICL7650CSD+.pdf
- Description:
- IC OPAMP ZERO-DRIFT 1CIRC 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,799
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Product details
Overview
ICL7650CSD+ from Maxim Integrated is a chopper-stabilized operational amplifier in 14-pin SOIC package, designed for ultra-precision DC signal conditioning. It delivers 1 µV max input offset voltage, 0.01 µV/°C max offset drift, and 10 pA max input bias current over 0°C to +70°C - enabling stable thermocouple amplification and strain gauge readout without trimming.
For engineers reviewing the ICL7650CSD+ datasheet, ICL7650CSD+ pinout, ICL7650CSD+ application, or ICL7650CSD+ equivalent, this page provides verified pin functions, real-world clamp-enabled overload recovery behavior, confirmed 200 Hz internal chopping frequency, and two validated alternative op amps with documented parameter trade-offs.
Technical Context
The ICL7650CSD+ employs dual-amplifier nulling architecture: a main amplifier continuously drives the output while a dedicated nulling amplifier alternately corrects its own offset and the main amplifier's offset using external capacitors (CEXTA/CEXTB) tied to V−. This closed-loop chopper stabilization operates independently of output level and across full supply and common-mode ranges.
Unlike standard op amps, it integrates an output clamp circuit (Pin 5) that activates before saturation to prevent charge buildup on correction capacitors - reducing overload recovery time by limiting uncontrolled differential input during overdrive. Its internal 200 Hz oscillator feeds CLK OUT (Pin 11), and supports external clocking via EXT/CLK IN (Pin 10) when INT/EXT (Pin 12) is pulled low.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | 1 µV max - eliminates need for manual nulling in precision sensor front-ends |
| Offset Drift vs. Temp | 0.01 µV/°C max - ensures <1 µV total drift across 0°C to +70°C commercial range |
| Input Bias Current | 10 pA max - enables high-impedance source interfacing (e.g., pH electrodes, piezoresistive sensors) |
| CMRR / PSRR | 120 dB min - rejects power supply noise and common-mode interference in noisy industrial environments |
| Unity-Gain Bandwidth | 2 MHz - supports stable closed-loop operation up to ~100 kHz with 10 kΩ load |
| Supply Current | 2.0 mA typical - enables low-power precision instrumentation without thermal drift penalty |
| Chopping Frequency | 200 Hz internal - sets fundamental ripple frequency; externally adjustable via EXT/CLK IN |
| Output Clamp Function | Active on Pin 5 - reduces overload recovery time by preventing capacitor saturation during overdrive |
Pinout & Package
ICL7650CSD+ uses a 14-pin SOIC (SO) package with 1.27 mm pitch, 8.65 mm × 3.9 mm body, and exposed pad not electrically connected. Pin functions are validated per Maxim's official datasheet Figure 11 (SO/DIP/CERDIP configuration).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CEXTB | Null storage capacitor B connection - must tie 0.1 µF low-leakage film cap to V− for stable offset correction |
| 2 | V− | Negative supply rail - serves as reference for CEXTA/CEXTB and CLAMP return path |
| 3 | -INPUT | Inverting input - high-impedance CMOS node requiring guarding to maintain 10¹² Ω input resistance |
| 4 | +INPUT | Non-inverting input - matched to -INPUT for common-mode rejection; guard ring required |
| 5 | CLAMP | Output clamp control - connects to summing junction to enable fast overload recovery |
| 6 | CEXTA | Null storage capacitor A connection - paired with CEXTB to set nulling time constant |
| 7 | V+ | Positive supply rail - supports ±3 V to ±8 V dual supply; max total 18 V |
| 8 | OUTPUT | Main output - swing ±4.7 V into 10 kΩ; limited by clamp activation during overdrive |
| 9 | N.C. | No internal connection - guard trace recommended to reduce leakage coupling |
| 10 | EXT/CLK IN | External clock input - accepts 0–V+ logic swing; disables internal oscillator when INT/EXT is low |
| 11 | INT/CLK OUT | Internal clock output - 200 Hz square wave; used for synchronization or external timing |
| 12 | INT/EXT | Internal/external clock select - open or high = internal clock; low = external clock mode |
| 13 | CRETN | Capacitor return - dedicated V− return for null caps; separate PCB trace required to avoid IR drop |
| 14 | N.C. | No internal connection - guard trace recommended; not used in ICL7650CSD+ layout |
Key Features
| Feature | Design Value |
|---|---|
| Chopper-stabilized architecture | Continuous self-nulling eliminates manual trimming and maintains sub-µV offset over temperature and time |
| Integrated output clamp | Reduces overload recovery time by preventing charge accumulation on nulling capacitors during saturation |
| 14-pin SOIC with guarded layout | Pins adjacent to inputs (3,4) are N.C., minimizing leakage paths and simplifying high-Z board design |
| Low 10 pA input bias current | Enables direct interface with high-impedance sources like thermistors and piezoelectric sensors |
| 200 Hz internal chopping frequency | Provides predictable ripple spectrum; allows synchronous filtering or clock-synchronized data acquisition |
| ±3 V to ±8 V supply flexibility | Supports legacy ±5 V systems and low-voltage ±3 V designs without performance degradation |
Applications
| Thermocouple Amplification | Strain Gauge Signal Conditioning |
|---|---|
|
Use Scenario: Amplifying µV-level Seebeck voltages from Type K thermocouples in environmental monitoring systems. IC Role / Device Role / Timing Role: Precision DC-coupled gain stage with zero-drift offset correction and 10 pA input bias to avoid loading thermocouple junctions. Use Value: Maintains <1 µV total offset error across 0°C–70°C ambient, eliminating cold-junction compensation drift errors. |
Use Scenario: Reading bridge outputs from metal foil strain gauges in structural health monitoring. IC Role / Device Role / Timing Role: Low-drift instrumentation amplifier front-end with 120 dB CMRR rejecting common-mode noise from long cable runs. Use Value: Enables 0.001% full-scale resolution without offset recalibration over 10,000-hour deployments. |
| High-Accuracy pH Measurement | Low-Drift Reference Buffer |
|
Use Scenario: Buffering glass electrode outputs in laboratory-grade pH meters where electrode impedance exceeds 100 MΩ. IC Role / Device Role / Timing Role: Ultra-low-bias voltage follower with guarded inputs to preserve signal integrity from high-Z electrochemical sources. Use Value: Prevents measurement drift caused by input leakage; 10 pA bias contributes <0.1 mV error at 100 MΩ source impedance. |
Use Scenario: Stabilizing voltage references (e.g., LTZ1000) in metrology-grade calibration equipment. IC Role / Device Role / Timing Role: Zero-drift buffer isolating reference from load variations while rejecting supply ripple via 120 dB PSRR. Use Value: Limits reference output drift to <50 nV/hour under thermal soak, meeting 7½-digit DMM stability requirements. |
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 |
|---|---|---|---|
| ICL7653CSA+ | 8-pin SOIC, no CLAMP pin, 0.1 µV/°C drift, same 1 µV offset - lower noise due to absence of clamp circuitry | Lacks output clamp; unsuitable for circuits with frequent overloads or fast transient recovery requirements | Select ICL7653CSA+ only when overload events are absent and lowest possible 10 Hz noise is critical |
| OP177GPZ | Single-supply capable, 25 µV offset, 0.1 µV/°C drift, 2 nA bias - non-chopper, laser-trimmed bipolar architecture | No chopping ripple; higher bias current limits use with >10 MΩ sources; requires external nulling pot | Choose OP177GPZ for AC-coupled or moderate-precision DC apps where chopper ripple is unacceptable |
Compared with ICL7650CSD+, ICL7653CSA+ offers quieter operation but forfeits overload recovery capability, while OP177GPZ trades zero-drift stability for higher bias current and external trimming - making ICL7650CSD+ optimal for unattended, high-Z, overload-prone precision DC systems.
Availability
ICL7650CSD+ is available at Aetrix Electronics and suitable for thermocouple amplification, strain gauge signal conditioning, high-accuracy pH measurement, and low-drift reference buffering requiring stable component supply across industrial, test & measurement, and scientific instrumentation programs.
Supply support for ICL7650CSD+ 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 and mixed-signal ICs for demanding industrial, medical, and communications applications - emphasizing low-noise, low-drift, and high-reliability performance.
The ICL7650CSD+ belongs to Maxim's chopper-stabilized op amp family, engineered specifically for ultra-low-offset DC signal conditioning in sensor interfaces where thermal drift and long-term stability are critical system constraints.
FAQ
What is the maximum operating supply voltage for the ICL7650CSD+?
The ICL7650CSD+ supports a total supply voltage (V+ to V−) up to 18 V, with recommended operation from ±3 V to ±8 V. Absolute maximum ratings specify (V+ + 0.3 V) to (V− − 0.3 V) for input voltage range, and the device remains functional across the full ±3 V to ±8 V range with verified 120 dB CMRR and PSRR performance. Exceeding 18 V risks permanent damage per Maxim's Absolute Maximum Ratings table.
Does the ICL7650CSD+ require external nulling capacitors, and what values are specified?
Yes, the ICL7650CSD+ requires two external nulling capacitors: CEXTA (Pin 6) and CEXTB (Pin 1), both connected to V− (Pin 2). For use with the internal 200 Hz oscillator, Maxim specifies 0.1 µF film-type capacitors (e.g., polypropylene) with low dielectric absorption. Ceramic capacitors may be used but increase settling time to 1 µV offset from 100 ms to several seconds.
How does the output clamp function work in the ICL7650CSD+, and which pin controls it?
The output clamp in the ICL7650CSD+ is controlled by Pin 5 (CLAMP), which connects to the summing junction or inverting input to create a current path just before output saturation. This prevents uncontrolled differential input and charge buildup on the nulling capacitors, reducing overload recovery time. The clamp activates automatically during overdrive and is unique to the ICL7650 series - not present in the pin-compatible ICL7653CSA+.
Can the ICL7650CSD+ operate with an external clock, and how is it configured?
Yes, the ICL7650CSD+ supports external clocking via Pin 10 (EXT/CLK IN). To enable it, Pin 12 (INT/EXT) must be tied low to disable the internal 200 Hz oscillator. The external clock should swing between ground and V+ for supplies ≤±6 V, or between V+ and (V+ − 6 V) for higher supplies. Duty cycle is noncritical below 500 Hz but should be 50–80% above that frequency to ensure proper capacitor charging.
What is the guaranteed input offset voltage specification for the ICL7650CSD+ over temperature?
The ICL7650CSD+ guarantees a maximum input offset voltage of 1 µV 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 max, meaning total drift across the range contributes ≤0.7 µV - resulting in a worst-case offset of ≤5.7 µV. This is validated in Maxim's Electrical Characteristics table for ICL7650/ICL7650B devices.
ICL7650CSD+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- 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:
- 14-SOIC
ICL7650CSD+ FAQ
1.How can I place an order for ICL7650CSD+ through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7650CSD+ 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 ICL7650CSD+ reliable?
The price and inventory of ICL7650CSD+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7650CSD+ is usually 5 days.
3.What payment methods are accepted for ICL7650CSD+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7650CSD+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7650CSD+?
ICL7650CSD+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7650CSD+ 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 ICL7650CSD+?
For technical support, including ICL7650CSD+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7650CSD+ requirements.
6.How does Aetrix verify that ICL7650CSD+ is sourced from the original manufacturer or authorized distributors?
All ICL7650CSD+ 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 ICL7650CSD+ meets industry standards.
7.What is the process for return or replacement of ICL7650CSD+?
All ICL7650CSD+ units undergo pre-shipment inspection (PSI). If there is an issue with ICL7650CSD+, 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 ICL7650CSD+ part is unused and in its original packaging.
Return procedure for ICL7650CSD+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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