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Analog Devices Inc./Maxim Integrated ICL7650CSA+T
- Part No.:
- ICL7650CSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ICL7650CSA+T.pdf
- Description:
- IC OPAMP ZERO-DRIFT 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,790
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Product details
Overview
ICL7650CSA+T from Maxim Integrated is a chopper-stabilized operational amplifier designed for ultra-precision DC signal conditioning in instrumentation and sensor interfaces. It delivers 1 µV max input offset voltage, 0.01 µV/°C max offset drift, 10 pA max input bias current, 2 MHz unity-gain bandwidth, and operates from ±3 V to ±8 V supplies - enabling sub-microvolt accuracy in thermocouple amplification and strain gauge front-ends.
For engineers reviewing the ICL7650CSA+T datasheet, ICL7650CSA+T pinout, ICL7650CSA+T application, or ICL7650CSA+T equivalent, key selection considerations include its 8-pin SOIC package with external nulling capacitors (pins 1 & 8), output clamp capability (pin 5), internal 200 Hz chopping frequency, and compatibility with high-impedance, low-drift analog measurement chains requiring no manual offset trimming.
Technical Context
The ICL7650CSA+T 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 nulling connections. This closed-loop nulling operates across full supply (±3 V to ±8 V) and common-mode ranges (–5.2 V to +3.0 V), independent of output level.
Its design minimizes intermodulation by injecting dynamic compensation current into the nulling loop, suppresses clock feed-through via balanced input switches, and integrates an output clamp circuit (enabled via pin 5) to limit saturation recovery time. The 0.1 µF external nulling capacitors (CEXTA/CEXTB) set the nulling time constant and directly govern settling time and low-frequency noise performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | 1 µV max - enables direct amplification of µV-level thermocouple outputs without calibration drift. |
| Offset Drift vs. Temp | 0.01 µV/°C max - ensures stable DC gain over 0°C to +70°C commercial range without thermal recalibration. |
| Input Bias Current | 10 pA max - supports high-impedance sensor sources (e.g., pH electrodes, piezoresistive bridges) without loading error. |
| Unity-Gain Bandwidth | 2 MHz - provides sufficient AC response for precision DC-coupled systems with <100 kHz signal content. |
| CMRR / PSRR | 120 dB min - rejects power supply ripple and common-mode interference in noisy industrial environments. |
| Supply Range | ±3 V to ±8 V - compatible with standard bipolar rails while avoiding overvoltage stress on internal clock circuitry. |
| Chopping Frequency | 200 Hz (internal) - places clock artifacts below 10 Hz, minimizing impact on DC-coupled measurements. |
Pinout & Package
ICL7650CSA+T 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. Thermal resistance θJA = 150°C/W; maximum power dissipation at +70°C ambient is 471 mW.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CEXTA) | Nulling capacitor A connection | Connects to external 0.1 µF capacitor to V−; sets nulling time constant and determines low-frequency stability. |
| 2 (−INPUT) | Inverting input terminal | High-impedance CMOS input (1012 Ω); requires guarding to prevent leakage-induced offset errors. |
| 3 (+INPUT) | Non-inverting input terminal | Matched to pin 2 for common-mode rejection; guard ring routing recommended on PCB. |
| 4 (V−) | Negative supply rail | Reference node for external null capacitors and CLAMP circuit; must be low-impedance with dedicated trace. |
| 5 (CLAMP) | Output clamp control | Enables fast overload recovery when tied to summing junction; reduces saturation recovery from >10 ms to <100 µs. |
| 6 (OUTPUT) | Amplifier output | Capable of ±4.95 V swing into 10 kΩ load; slew rate 2.5 V/µs limits large-signal step response. |
| 7 (V+) | Positive supply rail | Accepts +3 V to +8 V; internal regulator derives bias for chopper oscillator and nulling logic. |
| 8 (CEXTB) | Nulling capacitor B connection | Second external 0.1 µF capacitor to V−; balances nulling loop and suppresses even-order harmonics. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-zeroing without trimming | Continuous chopper-based nulling eliminates need for external potentiometers or factory calibration. |
| Ultra-low drift architecture | 0.01 µV/°C offset drift ensures <1 µV total drift over 0°C to +70°C - critical for unattended data loggers. |
| Output clamp circuit | Pin 5 enables hardware-assisted recovery from output saturation, reducing recovery time by >100× vs. standard choppers. |
| High CMRR/PSRR | 120 dB minimum maintains accuracy in presence of 60 Hz line noise or switching supply ripple. |
| Low-noise nulling capacitors | 0.1 µF film-type capacitors yield <2 µVp-p (0.1–10 Hz) input noise - optimized for thermistor bridge readouts. |
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 op amp providing gain, offset nulling, and common-mode rejection in the first stage of a temperature measurement front-end. Use Value: 1 µV offset and 0.01 µV/°C drift enable ±0.1°C system accuracy without periodic recalibration. |
Use Scenario: Reading differential voltage from 350 Ω foil strain gauges in Wheatstone bridge configurations under mechanical load. IC Role / Device Role / Timing Role: Low-bias-current, low-drift amplifier driving ratiometric ADC inputs with minimal bridge excitation error. Use Value: 10 pA input bias current prevents >1 µV error in 100 MΩ bridge arm impedance mismatches. |
| High-Resolution Data Acquisition | Precision Reference Buffering |
Use Scenario: Front-end conditioning for 24-bit delta-sigma ADCs in weigh scales and analytical instruments. IC Role / Device Role / Timing Role: DC-coupled gain stage with sub-µV offset stability, rejecting EMI and supply noise before digitization. Use Value: 120 dB PSRR preserves effective resolution by attenuating ±5 V supply ripple to <10 nV at input. |
Use Scenario: Buffering ultra-stable voltage references (e.g., LTZ1000, REF5050) to drive multiple ADC reference inputs. IC Role / Device Role / Timing Role: Unity-gain follower with negligible offset contribution and high open-loop gain (>10⁸) to maintain reference integrity. Use Value: 10¹² Ω input resistance prevents loading of high-impedance buried-zener references. |
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 0.5 µV offset, 0.005 µV/°C drift, but only 1.5 MHz GBW and no output clamp pin. | Lacks pin 5 clamp functionality; unsuitable where fast overload recovery is required. | Select MAX4238ASA+ only if ultimate drift performance outweighs need for hardware clamp-assisted recovery. |
| OP177GPZ | Non-chopper, laser-trimmed bipolar; 25 µV offset, 0.1 µV/°C drift, higher 2 nV/√Hz noise. | No auto-zeroing; requires manual nulling and exhibits greater long-term drift. | Choose OP177GPZ only in cost-sensitive, lower-accuracy applications where chopper ripple is unacceptable. |
Compared with MAX4238ASA+ and OP177GPZ, the ICL7650CSA+T uniquely combines sub-µV offset, integrated output clamp, and proven field reliability in legacy industrial instrumentation - making it the preferred choice for retrofitting aging precision analog systems requiring zero layout changes.
Availability
ICL7650CSA+T is available at Aetrix Electronics and suitable for thermocouple amplification, strain gauge signal conditioning, high-resolution data acquisition, precision reference buffering, and low-drift sensor interface applications requiring stable component supply across extended product lifecycles.
Supply support for ICL7650CSA+T 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 in industrial, medical, and communications systems.
The ICL7650CSA+T belongs to Maxim's legacy chopper-stabilized op amp family, engineered specifically for ultra-low-drift DC signal processing in instrumentation-grade measurement equipment where offset stability over time and temperature is non-negotiable.
FAQ
What is the maximum operating supply voltage for the ICL7650CSA+T?
The ICL7650CSA+T supports a total supply voltage (V+ to V−) up to 18 V, with recommended operation between ±3 V and ±8 V. Exceeding ±8 V increases clock ripple and may degrade offset stability; absolute maximum ratings specify 18 V, but functional performance is guaranteed only within the ±3 V to ±8 V range per the datasheet's electrical characteristics tables.
Does the ICL7650CSA+T require external nulling capacitors, and what value is specified?
Yes, the ICL7650CSA+T requires two external 0.1 µF low-leakage film capacitors (CEXTA and CEXTB) connected from pins 1 and 8 to V−. These capacitors set the nulling time constant and are essential for achieving the specified 1 µV offset and 0.01 µV/°C drift; ceramic capacitors are discouraged due to dielectric absorption effects that increase settling time beyond 100 ms.
How does the output clamp feature (pin 5) improve performance in the ICL7650CSA+T?
The CLAMP pin (pin 5) in the ICL7650CSA+T enables a hardware-assisted recovery path that reduces overload recovery time from >10 ms to <100 µs by preventing uncontrolled differential input during saturation. When connected to the summing junction, it shunts excess current away from the nulling capacitors, preserving correction voltage integrity and maintaining sub-µV accuracy after transient overloads.
Is the ICL7650CSA+T pin-compatible with standard 8-pin op amps like the LM741?
No, the ICL7650CSA+T is not pin-compatible with LM741 or LM101. While it shares the same 8-pin SOIC footprint, its pin functions differ: pins 1 and 8 are nulling capacitor terminals (not offset null), and pin 5 is CLAMP (not NC or compensation). Direct replacement requires PCB layout modification to route CEXTA/CEXTB and CLAMP connections.
What is the typical input noise voltage of the ICL7650CSA+T over 0.1–10 Hz?
The ICL7650CSA+T delivers 2 µVp-p input-referred noise over the 0.1 Hz to 10 Hz band, measured with 0.1 µF nulling capacitors and ±5 V supplies. This low 1/f noise performance is achieved through chopper stabilization and matched internal capacitor networks, making it suitable for high-resolution DC measurements where noise floor directly impacts effective resolution.
ICL7650CSA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 8-SOIC
ICL7650CSA+T FAQ
1.How can I place an order for ICL7650CSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7650CSA+T 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+T reliable?
The price and inventory of ICL7650CSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7650CSA+T is usually 5 days.
3.What payment methods are accepted for ICL7650CSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7650CSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7650CSA+T?
ICL7650CSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7650CSA+T 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+T?
For technical support, including ICL7650CSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7650CSA+T requirements.
6.How does Aetrix verify that ICL7650CSA+T is sourced from the original manufacturer or authorized distributors?
All ICL7650CSA+T 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+T meets industry standards.
7.What is the process for return or replacement of ICL7650CSA+T?
All ICL7650CSA+T units undergo pre-shipment inspection (PSI). If there is an issue with ICL7650CSA+T, 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+T part is unused and in its original packaging.
Return procedure for ICL7650CSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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