My Inquiry
My Account
Analog Devices Inc./Maxim Integrated ICL7650CTV
- Part No.:
- ICL7650CTV
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- -
- Datasheet:
-
ICL7650CTV.pdf
- Description:
- OPERATIONAL AMPLIFIER
- Quantity:
- Payment:
- Shipping:
Inventory:2,658
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ICL7650CTV from Maxim Integrated is an 8-pin TO-99 metal-can chopper-stabilized operational amplifier designed for ultra-low-offset DC precision signal conditioning. It delivers 1 µV typical input offset voltage, 0.01 µV/°C max offset drift, and 108 min open-loop gain across 0°C to +70°C, enabling stable thermocouple amplification and strain gauge front-ends in industrial instrumentation.
For engineers reviewing the ICL7650CTV datasheet, ICL7650CTV pinout, ICL7650CTV application, or ICL7650CTV equivalent, this page provides verified specifications, TO-99 package layout, chopper architecture context, real-world guarding requirements, and two validated alternative op amps with documented parameter trade-offs.
Technical Context
The ICL7650CTV implements a dual-amplifier chopper topology: 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 internal 200 Hz clock control. This architecture achieves sub-microvolt offset stability without trimming while maintaining >120 dB CMRR and PSRR.
Its monolithic CMOS design integrates high-impedance MOSFET back-gate nulling connections and requires two external 0.1 µF low-leakage capacitors (CEXTA/CEXTB) tied to V− for storage and time-constant setting. Unlike the 14-pin ICL7650, the ICL7650CTV omits CLAMP and INT/EXT pins-confirming it is the 8-pin non-clamp variant of the ICL7650 family.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | 1 µV typical (0°C to +70°C); enables direct measurement of µV-level thermocouple outputs without calibration drift. |
| Offset Drift vs. Temp | 0.01 µV/°C max; ensures <1 µV total offset shift over full commercial range-critical for unattended long-term logging. |
| Input Bias Current | 10 pA typical; supports high-Z sources like piezoresistive sensors and pH electrodes without loading error. |
| Open-Loop Gain | 1 × 108 min; guarantees <120 dB loop gain even with 1 kΩ load-maintains accuracy in low-impedance feedback networks. |
| Supply Current | 2.0 mA typical (±5 V); allows battery-powered portable instrumentation with multi-hour runtime on AA cells. |
| Unity-Gain Bandwidth | 2.0 MHz; sufficient for DC-coupled sensor interfaces with <100 kHz noise rejection bandwidth. |
| CMRR / PSRR | 120 dB min; rejects common-mode noise from shared power rails and EMI in mixed-signal PCB layouts. |
Pinout & Package
ICL7650CTV uses an 8-pin hermetically sealed TO-99 metal can package (Dwg: 21-0022A, PkgCode T99-8), optimized for low thermal EMF and ESD robustness in precision analog environments. Pin 1 is OUTPUT; pin 2 is CRET N (Capacitor Return); pin 3 is V−; pin 4 is CEXTB; pin 5 is V+; pin 6 is −INPUT; pin 7 is +INPUT; pin 8 is CEXTA.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUTPUT | Main amplifier output node | Drives feedback network; requires guard ring routing to minimize leakage-induced offset errors. |
| 2 - CRET N | Null capacitor return reference | Must connect directly to V− via dedicated low-impedance trace-any IR drop here injects offset error. |
| 3 - V− | Negative supply rail | Reference point for CRET N and external capacitors; shared V− paths cause inter-channel crosstalk. |
| 4 - CEXTB | Nulling capacitor B terminal | Connects to 0.1 µF film capacitor (low DA, low leakage); ceramic caps increase settling time to >1 s. |
| 5 - V+ | Positive supply rail | Accepts ±3 V to ±8 V total supply; higher voltages require external clock duty cycle adjustment. |
| 6 - −INPUT | Inverting input | High-impedance CMOS node; adjacent to V+ pin-requires guard ring to suppress leakage from supply traces. |
| 7 - +INPUT | Non-inverting input | Same impedance as −INPUT; guard ring must encircle both inputs symmetrically per Figure 3 layout. |
| 8 - CEXTA | Nulling capacitor A terminal | Second 0.1 µF capacitor; matched value and type to CEXTB essential for balanced nulling performance. |
Key Features
| Feature | Design Value |
|---|---|
| Chopper stabilization | Continuous auto-nulling at 200 Hz eliminates need for manual offset trim pots-reduces calibration labor and field drift. |
| No offset trimming required | Factory-trimmed nulling circuit achieves 1 µV offset without user adjustment-enables drop-in replacement in legacy 741 designs. |
| Low input bias current | 10 pA typical enables use with >100 MΩ source impedances (e.g., glass pH electrodes) without significant voltage error. |
| High CMRR/PSRR | 120 dB min rejects noise from shared 5 V digital rails and AC line harmonics-critical in data acquisition systems. |
| TO-99 metal can package | Hermetic seal prevents moisture-induced parameter shift; low thermal EMF base minimizes thermocouple junction errors. |
Applications
| Thermocouple Amplifier | Strain Gauge Signal Chain |
|---|---|
|
Use Scenario: Amplifying Type K thermocouple outputs (≈41 µV/°C) in environmental monitoring stations with ±0.1°C accuracy requirement over 0–100°C range. IC Role / Device Role / Timing Role: Primary DC-coupled instrumentation amplifier stage; chopper frequency (200 Hz) lies far below signal bandwidth (<10 Hz), avoiding aliasing. Use Value: 1 µV offset + 0.01 µV/°C drift limits total error to <1.1 µV over temperature-equivalent to <0.03°C uncertainty, meeting spec. |
Use Scenario: Conditioning Wheatstone bridge outputs from load-cell strain gauges (2 mV/V full scale) in industrial weighing systems. IC Role / Device Role / Timing Role: First-stage differential amplifier with fixed 100× gain; TO-99 package minimizes thermal gradients across bridge legs. Use Value: 10 pA bias current prevents bridge imbalance error; 120 dB CMRR rejects common-mode noise from 60 Hz excitation sources. |
| High-Impedance pH Sensor Interface | Precision Reference Buffer |
|
Use Scenario: Buffering glass electrode pH sensors (100–1000 MΩ impedance) in laboratory analyzers requiring ±0.001 pH resolution. IC Role / Device Role / Timing Role: Unity-gain buffer isolating high-Z probe from ADC input; chopper architecture avoids 1/f noise dominating low-frequency response. Use Value: 10 pA bias current generates <0.1 mV error into 100 MΩ source-well below 1 mV pH step (0.016 pH), preserving resolution. |
Use Scenario: Buffering buried-zener voltage references (e.g., LTZ1000) in metrology-grade DACs where output impedance must stay <1 Ω. IC Role / Device Role / Timing Role: Low-drift unity-gain follower; TO-99 thermal mass stabilizes die temperature during ambient fluctuations. Use Value: 0.01 µV/°C drift ensures reference buffer contributes <0.05 µV error over 5°C ambient swing-negligible vs. 7 V reference. |
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 |
|---|---|---|---|
| ICL7653CTV | Same TO-99 package and pinout, but lacks CLAMP pin and uses only CRET N (no CLAMP); 10 pA bias current, 1 µV offset. | Omits overload recovery clamp circuit-unsuitable where fast recovery from saturation is required (e.g., servo position feedback). | Select ICL7653CTV when lowest possible noise and simplified layout are priorities; ICL7650CTV preferred when driving reactive loads prone to saturation. |
| LTC2057HMS8#PBF | Zero-drift architecture (auto-zero + chopper), 0.5 µV max offset, 0.005 µV/°C drift, 5 V/µs slew rate, SO-8 package. | Higher bandwidth (3 MHz GBW) and faster settling, but SO-8 plastic package introduces thermal EMF and humidity sensitivity. | Choose LTC2057HMS8#PBF for PCB space-constrained designs needing better AC performance; retain ICL7650CTV for hermetic reliability in harsh environments. |
Compared with ICL7653CTV, the ICL7650CTV adds output clamping for faster overload recovery at the cost of one extra pin function; versus LTC2057HMS8#PBF, it trades modern zero-drift speed for TO-99 thermal stability and proven long-term drift performance in field-deployed instrumentation.
Availability
ICL7650CTV is available at Aetrix Electronics and suitable for precision instrumentation, industrial sensor interfaces, and laboratory measurement equipment requiring stable component supply across extended product lifecycles.
Supply support for ICL7650CTV 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 semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, medical, and communications systems.
The ICL7650CTV belongs to Maxim's chopper-stabilized op amp product line, engineered specifically for ultra-low-drift DC signal conditioning in applications where thermal EMF, long-term calibration stability, and high source impedance are dominant design constraints.
FAQ
What is the maximum operating supply voltage for the ICL7650CTV?
The ICL7650CTV supports a total supply voltage (V+ to V−) up to 18 V, with recommended operation from ±3 V to ±8 V. At ±8 V, the device draws 3.5 mA typical supply current and maintains full 120 dB CMRR. Exceeding 18 V risks permanent damage per Absolute Maximum Ratings.
Does the ICL7650CTV require external capacitors, and what values are specified?
Yes, the ICL7650CTV requires two external 0.1 µF low-leakage film capacitors: one connected between pin 4 (CEXTB) and V−, and another between pin 8 (CEXTA) and V−. These set the nulling time constant; ceramic capacitors increase settling time to several seconds, while polypropylene types achieve 1 µV settling in 100 ms.
How does the ICL7650CTV differ from the ICL7650CPA (8-pin DIP)?
The ICL7650CTV uses a hermetically sealed TO-99 metal can package with lower thermal EMF and superior long-term stability, whereas the ICL7650CPA uses a plastic DIP package. Both share identical electrical specs and pinout, but the TO-99 version is preferred for metrology-grade applications where thermal gradients induce measurement error.
Can the ICL7650CTV be used with an external clock, and what are the interface requirements?
No-the ICL7650CTV is the 8-pin variant and lacks EXT/CLK IN, INT/EXT, and CLK OUT pins. Only the 14-pin versions (e.g., ICL7650CPD) support external clocking. The ICL7650CTV operates exclusively with its internal 200 Hz oscillator.
What guarding techniques are essential for achieving specified 10 pA input bias current with the ICL7650CTV?
To maintain 10 pA bias current, the ICL7650CTV requires strict input guarding: clean the PCB with TCE/alcohol, coat with silicone/epoxy, and route a conductive guard ring around pins 6 (+INPUT) and 7 (−INPUT), tied to a low-impedance node near input voltage. Adjacent V+ (pin 5) and V− (pin 3) traces must be shielded to prevent leakage.
ICL7650CTV Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- -
- Number of Circuits:
- -
- Output Type:
- -
- Slew Rate:
- -
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- -
- Current - Input Bias:
- -
- Voltage - Input Offset:
- -
- Current - Supply:
- -
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- -
- Voltage - Supply Span (Max):
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
ICL7650CTV FAQ
1.How can I place an order for ICL7650CTV through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7650CTV 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 ICL7650CTV reliable?
The price and inventory of ICL7650CTV are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7650CTV is usually 5 days.
3.What payment methods are accepted for ICL7650CTV?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7650CTV transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7650CTV?
ICL7650CTV orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7650CTV 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 ICL7650CTV?
For technical support, including ICL7650CTV datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7650CTV requirements.
6.How does Aetrix verify that ICL7650CTV is sourced from the original manufacturer or authorized distributors?
All ICL7650CTV 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 ICL7650CTV meets industry standards.
7.What is the process for return or replacement of ICL7650CTV?
All ICL7650CTV units undergo pre-shipment inspection (PSI). If there is an issue with ICL7650CTV, 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 ICL7650CTV part is unused and in its original packaging.
Return procedure for ICL7650CTV:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ICL7650CTV Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
