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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:3,598
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Product details
Overview
ICL7650CSD 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, 10 pA max input bias current, and 2 MHz unity-gain bandwidth - enabling stable amplification of thermocouple, strain gauge, and thermistor outputs in industrial instrumentation.
For engineers reviewing the ICL7650CSD datasheet, ICL7650CSD pinout, ICL7650CSD application, or ICL7650CSD equivalent, this device is selected when sub-microvolt offset stability, near-zero thermal drift, and high CMRR/PSRR (120 dB min) are required in single-supply or dual-supply precision analog front-ends - especially where external nulling capacitors and output clamping are acceptable design constraints.
Technical Context
The ICL7650CSD implements a dual-amplifier chopper architecture: a main amplifier continuously processes the signal while a nulling amplifier 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 +3.0 V), independent of output level.
It features an internal 200 Hz chopping oscillator (available at CLK OUT pin), supports external clocking via EXT/CLK IN, and includes an output clamp circuit (pin 5) that minimizes overload recovery time by preventing uncontrolled differential input during saturation - a key differentiator from the pin-compatible ICL7653 series.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | 1 µV max - enables direct amplification of µV-level sensor signals without trimming or calibration. |
| 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 - preserves signal integrity with high-impedance sources like 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 fast settling for precision DC-to-low-frequency (<100 Hz) measurements. |
| Supply Current | 2.0 mA max - enables low-power operation in battery-backed or energy-constrained systems. |
| Common-Mode Range | –5.2 V to +3.0 V (with ±5 V supplies) - accommodates wide input signal excursions beyond rail. |
Pinout & Package
ICL7650CSD is housed in a 14-pin SOIC (Small Outline Integrated Circuit) package with exposed pad not specified - compatible with standard surface-mount reflow profiles. Pin functions are validated per Maxim's official datasheet Figure 11 (SO/DIP/CERDIP configuration).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CEXTA | Null Storage Capacitor A | Connects to external 0.1 µF low-leakage capacitor; stores correction voltage for nulling amplifier. |
| 2 - CEXTB | Null Storage Capacitor B | Second null storage node; matched with CEXTA to maintain chopper balance and minimize ripple. |
| 3 - V+ | Positive Supply Rail | Accepts +3 V to +8 V; internal regulator derives bias for chopper clock and amplifiers. |
| 4 - –INPUT | Inverting Input | High-impedance FET input (10¹² Ω); requires guarding to prevent leakage-induced offset errors. |
| 5 - CLAMP | Output Clamp Control | Enables fast overload recovery by limiting internal differential voltage before saturation occurs. |
| 6 - +INPUT | Noninverting Input | Matched to –INPUT; used in noninverting configurations or as reference point for guard ring. |
| 7 - V– | Negative Supply Rail | Accepts –3 V to –8 V; capacitor commons must connect directly to this pin to avoid IR drop errors. |
| 8 - OUTPUT | Main Amplifier Output | Capable of ±4.85 V swing into 10 kΩ; slew rate 2.5 V/µs limits large-signal transient response. |
| 9 - N.C. | No Internal Connection | Guard trace placement only; no electrical function - used to isolate input pins from adjacent metal. |
| 10 - N.C. | No Internal Connection | Same as pin 9; designated as guard in SOIC layout to reduce parasitic coupling to inputs. |
| 11 - CRETN | Capacitor Return | Low-impedance return path for CEXTA/CEXTB; must tie directly to V– with dedicated PCB trace. |
| 12 - EXT/CLK IN | External Clock Input | Accepts TTL/CMOS clock (200 Hz–375 Hz); disables internal oscillator when pulled low via INT/EXT. |
| 13 - INT/EXT | Internal/External Clock Select | Pulled up internally; tie to V– to enable external clock mode; open for default 200 Hz internal clock. |
| 14 - INT/CLK OUT | Internal Clock Output | Provides buffered 200 Hz square wave; used for synchronization or driving auxiliary circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Chopper-Stabilized Architecture | Continuous auto-nulling eliminates need for manual offset trim and maintains sub-µV accuracy over temperature and time. |
| Output Clamp Circuit | Reduces overload recovery time from seconds to microseconds by limiting input differential during saturation. |
| High CMRR & PSRR | 120 dB minimum ensures immunity to supply ripple and ground noise in shared-rail industrial systems. |
| Ultra-Low Input Bias Current | 10 pA maximum enables use with >100 MΩ source impedances without significant error voltage. |
| Extended Common-Mode Range | Operates with inputs down to –5.2 V (vs. V–), supporting level-shifting and bipolar sensor interfacing. |
Applications
| Thermocouple Signal Conditioning | Strain Gauge Bridge Amplification |
|---|---|
|
Use Scenario: Amplifying µV-level Seebeck voltages from Type K thermocouples in environmental monitoring systems. IC Role / Device Role / Timing Role: Precision DC op amp providing gain, offset nulling, and common-mode rejection in a 3-wire cold-junction-compensated front-end. Use Value: Achieves <±2 µV total system offset error over 0°C to +70°C - sufficient for ±0.1°C temperature resolution. |
Use Scenario: Reading unbalanced Wheatstone bridge outputs from load cells in industrial weighing platforms. IC Role / Device Role / Timing Role: Low-drift instrumentation amplifier core (configured as difference amplifier) rejecting bridge excitation noise and thermal EMFs. Use Value: Maintains <1 ppm linearity error over 8-hour production runs due to <0.1 µV/month offset drift. |
| Medical ECG Front-End | Calibration Reference Buffer |
|
Use Scenario: First-stage amplification of mV-level biopotential signals in portable ECG devices with dry electrodes. IC Role / Device Role / Timing Role: High-input-impedance, low-noise buffer isolating electrode interface from downstream filtering and digitization stages. Use Value: Enables >120 dB common-mode rejection at 50/60 Hz without active guarding, reducing mains interference below ADC noise floor. |
Use Scenario: Buffering ultra-stable voltage references (e.g., LTZ1000) in metrology-grade calibration equipment. IC Role / Device Role / Timing Role: Zero-drift follower maintaining reference integrity under varying load conditions and ambient temperature shifts. Use Value: Adds <±0.5 µV loading error over 0–10 mA output range - critical for maintaining 7½-digit DMM accuracy. |
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; lower noise (1.5 µVp-p vs. 2 µVp-p); no output clamping capability. | Suitable where fastest overload recovery is not required and board space is constrained. | Select ICL7653CSA only if clamp functionality is unnecessary and 8-pin footprint is mandatory. |
| LTC2057HS8#PBF | Zero-drift architecture (auto-zero); 0.5 µV max offset; 0.005 µV/°C drift; no external capacitors required. | Eliminates external null caps and associated PCB layout complexity; higher cost and larger quiescent current (1.1 mA). | Choose LTC2057HS8#PBF when minimizing external components and achieving lower drift outweigh layout flexibility. |
Compared with ICL7650CSD, ICL7653CSA removes clamping and reduces pin count but sacrifices overload recovery performance, while LTC2057HS8#PBF replaces chopper topology with auto-zeroing to eliminate external capacitors and achieve tighter drift specs - making it preferable for compact, low-maintenance designs where supply current is not critical.
Availability
ICL7650CSD is available at Aetrix Electronics and suitable for precision instrumentation, medical sensor interfaces, and calibration equipment requiring stable component supply across extended product lifecycles.
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) is a fabless semiconductor company specializing in high-performance analog and mixed-signal ICs for industrial, automotive, and communications markets.
The ICL7650CSD belongs to Maxim's legacy chopper-stabilized op amp family, engineered specifically for ultra-low-offset, low-drift DC amplification in metrology, test equipment, and sensor signal chains where long-term stability is non-negotiable.
FAQ
What is the primary function of the CLAMP pin on the ICL7650CSD?
The CLAMP pin (pin 5) on the ICL7650CSD provides an output clamping path that limits internal differential voltage during overload conditions. When connected to the summing junction or inverting input, it prevents uncontrolled charge buildup on the nulling capacitors - reducing typical overload recovery time from hundreds of milliseconds to under 10 µs. This feature is absent in the ICL7653 series and is a defining characteristic of the ICL7650CSD.
Does the ICL7650CSD require external nulling capacitors, and what values are recommended?
Yes, the ICL7650CSD requires two external low-leakage capacitors: CEXTA and CEXTB (pins 1 and 2), plus CRETN (pin 11) tied directly to V–. For operation with the internal 200 Hz clock, 0.1 µF film-type capacitors (e.g., polypropylene) are recommended to minimize dielectric absorption and achieve 1 µV settling in 100 ms. Ceramic capacitors may increase settling time to several seconds due to higher absorption.
How does the ICL7650CSD differ from the ICL7653 series in terms of pin compatibility and functionality?
The ICL7650CSD uses a 14-pin SOIC package with dedicated CLAMP (pin 5) and CRETN (pin 11) pins, whereas the ICL7653CSA uses an 8-pin SOIC and omits both. The ICL7650CSD supports output clamping and has slightly higher broadband noise (2 µVp-p vs. 1.5 µVp-p), while the ICL7653CSA offers better AC common-mode rejection and simpler layout. They share identical nulling architecture and offset specifications but are not pin-compatible.
Can the ICL7650CSD operate from a single supply, and what are the limitations?
The ICL7650CSD is specified for dual-supply operation (±3 V to ±8 V), but can be used in single-supply configurations with appropriate biasing. Its common-mode input range extends to –5.2 V (relative to V–), so with V– = 0 V and V+ = +10 V, valid input range is 0 V to +3.0 V. Output swing is limited to ~0.15 V above V– and ~0.15 V below V+, requiring careful headroom planning. Single-supply use is feasible but not optimized - dual supply is strongly recommended for full specification compliance.
What is the role of the INT/EXT and EXT/CLK IN pins on the ICL7650CSD?
The INT/EXT pin (pin 13) selects clock source: left open for internal 200 Hz oscillator (default), or tied to V– to enable external clock mode. EXT/CLK IN (pin 12) accepts external TTL/CMOS clock signals (200–375 Hz). When external clocking is used, the internal oscillator is disabled, allowing synchronization with system timing or reduction of clock-related ripple in sensitive measurements - a capability not available on the ICL7653 series.
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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