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Analog Devices Inc./Maxim Integrated ICL7650CSD+T
- Part No.:
- ICL7650CSD+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ICL7650CSD+T.pdf
- Description:
- IC OPAMP ZERO-DRIFT 1CIRC 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,185
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Product details
Overview
ICL7650CSD+T 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, 120 dB min CMRR, and operates from ±3 V to ±8 V supplies - enabling thermocouple, strain gauge, and precision instrumentation applications where long-term stability and sub-microvolt accuracy are critical.
For engineers reviewing the ICL7650CSD+T datasheet, ICL7650CSD+T pinout, ICL7650CSD+T application, or ICL7650CSD+T equivalent, key selection considerations include its 14-pin SOIC package with integrated output clamp, internal 200 Hz chopping frequency (available at CLK OUT), nulling capacitor interface (CEXTA/CEXTB), and compatibility with high-impedance, low-drift analog front-ends requiring no external trimming.
Technical Context
The ICL7650CSD+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 under clock control. This closed-loop nulling operates independently of output level across full supply and common-mode ranges.
Its MOSFET back-gate nulling connections provide inherently high impedance, while two external 0.1 µF low-leakage capacitors (CEXTA, CEXTB) store correction potentials and set nulling time constants. The device includes an output clamp circuit (pins 5 and 12–14) to minimize overload recovery time by preventing uncontrolled differential input during saturation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | 1 µV max - enables direct measurement 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 sources (e.g., pH electrodes, piezoresistive sensors) without significant error. |
| CMRR / PSRR | 120 dB min - rejects common-mode noise from shared power rails or ground loops in industrial sensor nodes. |
| Supply Current | 2.0 mA typical - allows battery-powered precision instrumentation with multi-year runtime using coin cells. |
| Unity-Gain BW | 2.0 MHz - supports fast settling for DC-coupled step responses while maintaining chopper stability. |
| Chopping Frequency | 200 Hz internal (CLK OUT pin) - places switching artifacts below audio band, simplifying anti-alias filtering. |
Pinout & Package
ICL7650CSD+T is housed in a 14-pin SOIC (Small Outline Integrated Circuit) package with 1.27 mm pitch, JEDEC MS-012AC compliant, and rated for 0°C to +70°C operation. The package features exposed pad option not present; standard SOICN footprint applies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CEXTA) | Null Storage Capacitor A | Connects to external 0.1 µF capacitor to V−; stores correction voltage for main amplifier nulling loop. |
| 2 (CEXTB) | Null Storage Capacitor B | Connects to second external 0.1 µF capacitor to V−; completes balanced nulling capacitor pair. |
| 3 (INT/EXT) | Internal/External Clock Select | Open or tied to V− to select internal 200 Hz oscillator; drives EXT/CLK IN when externally clocked. |
| 4 (EXT/CLK IN) | External Clock Input | Accepts external clock (200–375 Hz); duty cycle 50–80% preferred above 500 Hz for capacitor charging control. |
| 5 (CLAMP) | Output Clamp Control | Connected to summing junction to activate clamp circuit, reducing overload recovery time by limiting input differential. |
| 6 (+INPUT) | Noninverting Input | High-impedance CMOS input (10¹² Ω); requires guarding to prevent leakage-induced offset errors. |
| 7 (−INPUT) | Inverting Input | High-impedance CMOS input; adjacent to guard pins (9, 10) in 14-pin DIP/SOIC layout to simplify PCB guarding. |
| 8 (V+) | Positive Supply Rail | Accepts +3 V to +8 V; internal regulator derives bias for chopper logic and amplifiers. |
| 9 (N.C.) | No Internal Connection | Guard ring connection point on PCB; ties to low-impedance reference near inputs to shunt stray leakage currents. |
| 10 (N.C.) | No Internal Connection | Second guard ring point; used with pin 9 to surround input traces and suppress board-level leakage paths. |
| 11 (V−) | Negative Supply Rail | Accepts −3 V to −8 V; serves as return for null capacitors and clamp circuit reference. |
| 12 (CRETN) | Capacitor Return | Common node for CEXTA/CEXTB; must connect directly to V− via dedicated low-IR-drop trace to avoid injection errors. |
| 13 (CLK OUT) | Internal Clock Output | Provides buffered 200 Hz square wave; usable for synchronizing external ADC sampling or daisy-chained choppers. |
| 14 (OUTPUT) | Main Amplifier Output | Capable of ±4.95 V swing into 10 kΩ; includes internal clamp path when CLAMP pin is activated. |
Key Features
| Feature | Design Value |
|---|---|
| Chopper-Stabilized Architecture | Continuous auto-nulling eliminates need for manual offset trim pots or periodic recalibration in field-deployed instruments. |
| Output Clamp Circuit | Reduces overload recovery time from seconds to microseconds by preventing charge buildup on null capacitors during saturation. |
| 14-Pin SOIC with Guard Pins | Pins 9 and 10 are dedicated no-connect guard points, enabling robust input guarding without added components or board area. |
| Low 10 pA Input Bias Current | Enables use with >1 GΩ source impedances (e.g., glass pH electrodes, piezoelectric sensors) without measurable current-induced error. |
| 200 Hz Internal Clock | Fixed-frequency operation avoids external crystal cost/complexity while placing ripple outside sensitive DC/low-frequency bands. |
Applications
| Thermocouple Signal Conditioning | Strain Gauge Bridge Amplification |
|---|---|
|
Use Scenario: Amplifying µV-level Seebeck voltages from Type K/J thermocouples in environmental monitoring systems. IC Role / Device Role / Timing Role: Precision DC-coupled op amp providing gain, offset nulling, and common-mode rejection before 16-bit ADC digitization. Use Value: Achieves <1 µV total input-referred offset drift over 0–70°C, eliminating cold-junction compensation drift errors in portable data loggers. |
Use Scenario: Reading mV-level differential outputs from 350 Ω foil strain gauges in structural health monitoring load cells. IC Role / Device Role / Timing Role: Instrumentation-grade amplifier with guarded inputs and output clamp for fast overload recovery during mechanical shock events. Use Value: Maintains 120 dB CMRR despite PCB thermal gradients, enabling 0.01% full-scale linearity without active temperature compensation. |
| High-Impedance pH Electrode Interface | Low-Drift Reference Buffer |
|
Use Scenario: Buffering glass electrode outputs (100 MΩ–1 GΩ) in handheld pH meters with single AA battery operation. IC Role / Device Role / Timing Role: Ultra-low-bias-current voltage follower isolating high-Z sensor from ADC input capacitance and noise. Use Value: 10 pA bias current limits voltage error to <10 µV across 1 GΩ source, preserving 0.01 pH resolution over battery life. |
Use Scenario: Stabilizing ultra-low-drift voltage references (e.g., LTZ1000) in metrology-grade calibrators and DAC output stages. IC Role / Device Role / Timing Role: Zero-drift buffer amplifier rejecting supply ripple and thermal EMFs in precision reference distribution networks. Use Value: 0.01 µV/°C drift ensures reference stability remains within 50 nV/°C over operating range, meeting 7½-digit DMM 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+T | 8-pin SOIC, no CLAMP pin, slightly lower noise (no clamp circuitry), same 1 µV offset and 10 pA bias. | Lacks output clamp; unsuitable for applications with frequent overloads or fast transient recovery requirements. | Select ICL7653CSA+T only when board space is constrained and overload conditions are absent or managed externally. |
| LTC2057HMS8#PBF | Zero-drift op amp with 0.5 µV max offset, 0.005 µV/°C drift, but higher 250 µA supply current and no internal clamp. | Superior drift performance but incompatible pinout and higher power; requires redesign of supply and guarding layout. | Choose LTC2057HMS8#PBF only when sub-0.5 µV offset stability over extended temperature cycles outweighs PCB redesign effort. |
Compared with ICL7650CSD+T, the ICL7653CSA+T offers identical precision specs in a smaller 8-pin package but sacrifices overload recovery capability, while the LTC2057HMS8#PBF improves drift by 2× at 250× higher supply current and no pin compatibility - making ICL7650CSD+T optimal for space-constrained, overload-prone, battery-powered precision analog front-ends.
Availability
ICL7650CSD+T is available at Aetrix Electronics and suitable for thermocouple signal conditioning, strain gauge amplification, pH electrode interfacing, precision reference buffering, and low-drift instrumentation requiring stable component supply across industrial, medical, and test equipment programs.
Supply support for ICL7650CSD+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) is a fabless semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The ICL7650CSD+T belongs to Maxim's legacy chopper-stabilized op amp family, engineered specifically for ultra-low-drift, zero-calibration DC signal chains in precision measurement and sensor interface systems.
FAQ
What is the maximum supply voltage for the ICL7650CSD+T?
The ICL7650CSD+T supports a total supply voltage (V+ to V−) up to 18 V, with recommended operating range of ±3 V to ±8 V. Exceeding ±8 V increases internal power dissipation and may degrade long-term offset stability; operation at ±8 V yields ±4.95 V output swing into 10 kΩ, as specified in the absolute maximum ratings table of the official datasheet.
Does the ICL7650CSD+T require external nulling capacitors, and what value should be used?
Yes, the ICL7650CSD+T requires two external nulling capacitors: CEXTA (pin 1) and CEXTB (pin 2), both connected to V−. For use with the internal 200 Hz clock, the specified value is 0.1 µF each. Low-leakage film capacitors (e.g., polypropylene) are preferred over ceramics to minimize dielectric absorption and achieve 1 µV settling in 100 ms after power-on.
How does the output clamp function in the ICL7650CSD+T improve system performance?
The output clamp in the ICL7650CSD+T (activated by connecting pin 5 to the summing junction) prevents uncontrolled input differential voltage during output saturation, thereby avoiding charge accumulation on the internal nulling capacitors. This reduces overload recovery time from seconds to microseconds - critical in applications like strain gauge impact detection or fault-tolerant sensor interfaces where rapid return to linear operation is required.
Can the ICL7650CSD+T operate with an external clock, and what are the timing requirements?
Yes, the ICL7650CSD+T can accept an external clock via pin 4 (EXT/CLK IN). To enable external mode, pin 3 (INT/EXT) must be tied to V−. The external clock frequency should be 200–375 Hz; for frequencies above 500 Hz, a 50–80% positive duty cycle is recommended to ensure proper capacitor charging. The clock must swing between ground and V+ for supplies ≤±6 V, or between V+ and (V+ − 6 V) for higher supplies.
Is the ICL7650CSD+T pin-compatible with standard 8-pin op amps like the LM741?
No, the ICL7650CSD+T is a 14-pin SOIC device and is not pin-compatible with 8-pin op amps. Its pinout differs fundamentally: pins 1 and 2 are null capacitors, pin 5 is CLAMP, pins 9 and 10 are guard points, and pin 13 provides CLK OUT. While the ICL7653 variant shares functional similarity with LM741 in 8-pin form, the ICL7650CSD+T's 14-pin layout is optimized for guarding, clamping, and chopper control - requiring dedicated PCB layout.
ICL7650CSD+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 14-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:
- 14-SOIC
ICL7650CSD+T FAQ
1.How can I place an order for ICL7650CSD+T through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7650CSD+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 ICL7650CSD+T reliable?
The price and inventory of ICL7650CSD+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7650CSD+T is usually 5 days.
3.What payment methods are accepted for ICL7650CSD+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7650CSD+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7650CSD+T?
ICL7650CSD+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7650CSD+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 ICL7650CSD+T?
For technical support, including ICL7650CSD+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7650CSD+T requirements.
6.How does Aetrix verify that ICL7650CSD+T is sourced from the original manufacturer or authorized distributors?
All ICL7650CSD+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 ICL7650CSD+T meets industry standards.
7.What is the process for return or replacement of ICL7650CSD+T?
All ICL7650CSD+T units undergo pre-shipment inspection (PSI). If there is an issue with ICL7650CSD+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 ICL7650CSD+T part is unused and in its original packaging.
Return procedure for ICL7650CSD+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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