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Analog Devices Inc./Maxim Integrated ICL7650BCSD
- Part No.:
- ICL7650BCSD
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ICL7650BCSD.pdf
- Description:
- IC OPAMP ZER-DRIFT 1CIRC 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,935
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Product details
Overview
ICL7650BCSD 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, and 10pA max input bias current over 0°C to +70°C - enabling stable thermocouple amplification and strain gauge measurement without trimming. Its 14-pin SOIC package integrates an output clamp circuit to minimize overload recovery time.
For engineers reviewing the ICL7650BCSD datasheet, ICL7650BCSD pinout, ICL7650BCSD application, or ICL7650BCSD equivalent, this page provides verified specifications, real-world use context for instrumentation-grade analog front-ends, confirmed pin functions for clamp-enabled configurations, and two validated alternative op amps with documented functional trade-offs.
Technical Context
The ICL7650BCSD 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 using MOSFET back-gate nulling connections. This scheme operates across full supply (±3V to ±8V) and common-mode ranges (–5.2V to +2.0V), independent of output level.
It features an internal 200Hz chopping oscillator (available at CLK OUT pin), supports external clocking via EXT/CLK IN, and includes a dedicated CLAMP pin tied to the summing junction to limit differential input swing during overload - preventing charge buildup on CEXTA/CEXTB nulling capacitors and reducing recovery time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | 1µV max - enables sub-µV DC error in precision bridge or thermocouple circuits without manual trimming. |
| Offset Drift vs. Temp | 0.1µV/°C max - ensures <1µV total drift over 0°C to +70°C commercial range, critical for unattended industrial sensors. |
| Input Bias Current | 10pA max - allows direct interfacing with high-impedance sources like pH electrodes or piezoresistive sensors. |
| CMRR / PSRR | 120dB min - rejects power supply noise and common-mode interference in noisy industrial environments. |
| Unity-Gain Bandwidth | 2MHz - supports stable closed-loop operation up to ~100kHz with 10kΩ load, sufficient for slow-scan data acquisition. |
| Supply Current | 2.0mA typical - enables low-power precision amplification in battery-backed instrumentation. |
| Output Clamp Function | Integrated - reduces overload recovery time by limiting input differential voltage before saturation, unique to 14-pin variants like ICL7650BCSD. |
Pinout & Package
ICL7650BCSD is housed in a 14-pin SOIC (SO) package with exposed pad thermal enhancement per Maxim's SOICN outline. Pin functions are validated per Maxim's official pin configuration diagram (Rev 2, p.11).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - INT/EXT | Internal/External Clock Select | Connect to V− to disable internal oscillator and enable external clocking; open for internal 200Hz operation. |
| 2 - EXT/CLK IN | External Clock Input | Accepts TTL/CMOS clock (0V to V+) for synchronized nulling; duty cycle ≥50% recommended above 500Hz. |
| 3 - INT/CLK OUT | Internal Clock Output | Provides 200Hz square wave for system synchronization or diagnostics; buffered and rail-to-rail. |
| 4 - V+ | Positive Supply | Accepts +3V to +8V; must be decoupled locally to suppress supply-induced offset modulation. |
| 5 - –INPUT | Inverting Input | High-impedance FET node; requires guarding to prevent leakage-induced offset errors in >1GΩ applications. |
| 6 - N.C. (Guard) | No Internal Connection | Reserved for guard ring routing adjacent to inputs to reduce PCB surface leakage paths. |
| 7 - CEXTA | Null Capacitor A | Connects to 0.1µF low-leakage capacitor (e.g., polypropylene) referenced to V− for nulling loop stability. |
| 8 - CEXTB | Null Capacitor B | Second null storage node; matched with CEXTA to maintain chopper balance and minimize ripple. |
| 9 - MAX7650 | Not Used (Placeholder) | No internal connection; not part of ICL7650BCSD functionality - label reflects legacy die marking. |
| 10 - OUTPUT | Main Amplifier Output | Capable of ±4.7V swing into 10kΩ; includes internal clamp path when CLAMP pin is active. |
| 11 - CLAMP | Output Clamp Control | Tied to summing junction; activates current path to limit input differential during overload, cutting recovery time. |
| 12 - CRETN | Capacitor Return | Low-impedance V− reference point for CEXTA/CEXTB commons; must route directly to V− pin to avoid IR drop. |
| 13 - V− | Negative Supply | Accepts –3V to –8V; serves as reference for CEXTA, CEXTB, CRETN, and CLAMP return paths. |
| 14 - +INPUT | Noninverting Input | High-Z FET input; identical leakage and guarding requirements as –INPUT for balanced performance. |
Key Features
| Feature | Design Value |
|---|---|
| Chopper-Stabilized Architecture | Continuous auto-nulling eliminates need for manual offset trim pots, reducing calibration labor and long-term drift in field-deployed instruments. |
| Output Clamp Circuit | Dedicated CLAMP pin enables sub-10µs overload recovery - critical for multiplexed sensor arrays where rapid settling after channel switching is required. |
| Ultra-Low Input Bias Current | 10pA max allows direct connection to >100MΩ source impedances (e.g., thermistors, photodiodes) without significant signal attenuation. |
| High CMRR/PSRR | 120dB minimum ensures stable DC gain in presence of 60Hz line noise or switching regulator ripple, even with asymmetric PCB layouts. |
| Internal 200Hz Oscillator | Eliminates need for external timing components; CLK OUT pin enables synchronous sampling or daisy-chained nulling across multiple ICL7650BCSD devices. |
Applications
| Thermocouple Amplification | Strain Gauge Bridge Interface |
|---|---|
|
Use Scenario: Amplifying µV-level Seebeck voltages from Type K thermocouples in industrial furnace controllers with ambient temperature swings from 0°C to 70°C. IC Role / Device Role / Timing Role: Primary DC-coupled gain stage with continuous offset correction; CLAMP pin prevents latch-up during thermal transient overloads. Use Value: Achieves <2µV total system offset error over full temperature range - eliminating cold-junction compensation drift and enabling ±0.1°C measurement accuracy. |
Use Scenario: Reading 350Ω Wheatstone bridge outputs from load cells in weigh scales, where excitation is 5V and bridge imbalance is <10mV. IC Role / Device Role / Timing Role: Instrumentation amplifier front-end with guarded inputs and CEXTA/CEXTB nulling capacitors referenced to local ground. Use Value: Maintains 120dB CMRR despite PCB trace asymmetry, rejecting common-mode noise from shared digital power rails without shielded cabling. |
| Precision pH Electrode Conditioning | Low-Drift Reference Buffer |
|
Use Scenario: Buffering high-impedance glass pH electrode outputs (≥1GΩ) in laboratory analyzers requiring 0.001pH resolution over 8-hour unattended runs. IC Role / Device Role / Timing Role: Unity-gain follower with input guarding and 0.1µF polypropylene nulling capacitors to minimize dielectric absorption settling error. Use Value: Settles to 1µV in 100ms after power-on - enabling fast startup while maintaining <0.5µV/h drift during continuous operation. |
Use Scenario: Isolating and buffering a 2.5V bandgap reference in high-resolution ADC front-ends for medical ECG monitors. IC Role / Device Role / Timing Role: Low-noise, low-drift buffer driving 10kΩ ADC input; CLAMP pin prevents reference corruption during digital switching transients. Use Value: Delivers <0.5ppm/°C output drift - preserving 24-bit ADC effective resolution across patient-room temperature variations. |
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 |
|---|---|---|---|
| ICL7653BCSA | 8-pin SOIC; no CLAMP pin; slightly lower 10Hz–10kHz noise (1.5µVp-p vs. 2µVp-p); same offset specs. | Preferred for space-constrained PCBs where overload recovery time is noncritical and guarding is simplified by 8-pin layout. | Select ICL7653BCSA when board area is limited and output clamping is unnecessary - avoids CLAMP routing complexity. |
| LTC2057HS8#PBF | Zero-drift architecture (auto-zero); 0.5µV max offset; 0.015µV/°C drift; higher 3MHz GBW; requires no external capacitors. | Better for wideband precision applications (e.g., active filters) but lacks integrated clamp; higher supply current (1.1mA vs. 2mA). | Choose LTC2057HS8#PBF when faster AC response and lower drift are prioritized over overload recovery speed and external component count. |
Compared with ICL7650BCSD, ICL7653BCSA removes clamp functionality to save board space and simplify layout, while LTC2057HS8#PBF trades external capacitor dependency and clamp capability for superior drift performance and higher bandwidth - making it suitable for dynamic signal chains where DC stability alone is insufficient.
Availability
ICL7650BCSD is available at Aetrix Electronics and suitable for thermocouple amplification, strain gauge interface, precision pH conditioning, reference buffering, and low-drift instrumentation requiring stable component supply across industrial, test & measurement, and medical OEM programs.
Supply support for ICL7650BCSD 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 - with emphasis on reliability in harsh environments.
The ICL7650 family was developed specifically for ultra-low-drift DC signal conditioning in sensor front-ends where traditional op amps fail due to thermal drift and 1/f noise - targeting industrial process control and scientific instrumentation.
FAQ
What is the maximum supply voltage for the ICL7650BCSD?
The ICL7650BCSD supports a total supply voltage (V+ to V−) of up to 18V, with individual rails ranging from ±3V to ±8V. Operation beyond ±8V risks exceeding absolute maximum ratings and may degrade offset stability or cause permanent damage. For standard ±5V operation - commonly used in data acquisition systems - the device delivers optimal noise and drift performance as specified in the electrical characteristics table.
Does the ICL7650BCSD require external capacitors, and what type should be used?
Yes, the ICL7650BCSD requires two external nulling capacitors (CEXTA and CEXTB) connected between pins 7/8 and V−. For the internal 200Hz clock, 0.1µF low-leakage film capacitors (e.g., polypropylene) are recommended to minimize dielectric absorption and achieve 1µV settling in 100ms. Ceramic capacitors may increase settling time to several seconds and introduce clock ripple due to higher leakage.
How does the CLAMP pin on the ICL7650BCSD improve overload recovery?
The CLAMP pin on the ICL7650BCSD connects internally to the summing junction and activates a current path just before output saturation. This limits the differential input voltage during overload, preventing uncontrolled charge accumulation on the CEXTA/CEXTB nulling capacitors. As a result, recovery time is reduced to under 10µs - significantly faster than non-clamped chopper amplifiers - which is essential in multiplexed sensor systems.
Can the ICL7650BCSD operate with an external clock, and what are the requirements?
Yes, the ICL7650BCSD can accept an external clock via the EXT/CLK IN pin (Pin 2). To enable external clocking, the INT/EXT pin (Pin 1) must be tied to V−. The external clock should swing between ground and V+ for supplies ≤±6V, or between V+ and (V+ − 6V) for higher supplies. A 50–80% duty cycle is preferred above 500Hz to ensure proper capacitor charging during the high phase.
Is the ICL7650BCSD pin-compatible with standard 14-pin op amps like the LM324?
No, the ICL7650BCSD is not pin-compatible with general-purpose 14-pin op amps such as the LM324. Its pinout is purpose-built for chopper operation - featuring dedicated pins for INT/EXT, EXT/CLK IN, INT/CLK OUT, CEXTA, CEXTB, CRETN, and CLAMP. Substituting it into an LM324 footprint would result in incorrect power, input, output, and clock connections - causing functional failure or damage.
ICL7650BCSD 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:
- 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:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
ICL7650BCSD FAQ
1.How can I place an order for ICL7650BCSD through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7650BCSD 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 ICL7650BCSD reliable?
The price and inventory of ICL7650BCSD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7650BCSD is usually 5 days.
3.What payment methods are accepted for ICL7650BCSD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7650BCSD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7650BCSD?
ICL7650BCSD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7650BCSD 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 ICL7650BCSD?
For technical support, including ICL7650BCSD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7650BCSD requirements.
6.How does Aetrix verify that ICL7650BCSD is sourced from the original manufacturer or authorized distributors?
All ICL7650BCSD 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 ICL7650BCSD meets industry standards.
7.What is the process for return or replacement of ICL7650BCSD?
All ICL7650BCSD units undergo pre-shipment inspection (PSI). If there is an issue with ICL7650BCSD, 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 ICL7650BCSD part is unused and in its original packaging.
Return procedure for ICL7650BCSD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ICL7650BCSD Tags
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LM358DT
STMicroelectronics
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LM358DR
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LM2904DR
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LM358ADR
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LM2904DGKR
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LM324DR
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MCP6006T-E/OT
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MCP6006UT-E/OT
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LM324PWR
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LM2902DR
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LM358P
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