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Analog Devices Inc./Maxim Integrated ICL7614ACSA
- Part No.:
- ICL7614ACSA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ICL7614ACSA.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,133
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Product details
Overview
ICL7614ACSA from Maxim Integrated is a single, externally compensated, ultra-low-input-bias-current CMOS operational amplifier with pin-selectable quiescent current (10 μA/100 μA/1 mA), ±1 V to ±8 V dual-supply operation (or 2–16 V single supply), and 1 pA typical input bias current at +25°C. It delivers rail-to-rail output swing (±0.96 V at 0–70°C, RL = 1 MΩ) and is optimized for high-impedance sensor interfaces including pH meters and photodiode amplifiers.
For engineers reviewing the ICL7614ACSA datasheet, ICL7614ACSA pinout, ICL7614ACSA application, or ICL7614ACSA equivalent, key selection criteria include its programmable IQ architecture, external compensation flexibility (39 pF recommended), 0.044–1.4 MHz unity-gain bandwidth range, 10¹² Ω input impedance, and guaranteed 2 mV max input offset voltage across 0–70°C.
Technical Context
The ICL7614ACSA implements a CMOS input stage with ultra-high input impedance and programmable bias current via the IOSET pin, enabling trade-offs between power (10 μA min) and performance (1.4 MHz GBW, 1.6 V/µs slew rate at 1 mA). Its external compensation (pin 6 to pin 8) supports stable operation at gains ≥20 when IQ = 1 mA, unlike internally compensated variants such as ICL7611.
It features offset-null capability via dedicated OFFSET pins, operates over ±1 V to ±8 V supplies, and maintains 80 dB minimum CMRR and PSRR across temperature. Input-referred noise is 100 nV/√Hz and 0.01 pA/√Hz - critical for low-level signal conditioning in battery-powered instrumentation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 1 pA typical at +25°C; enables picoampere-level current measurement in photodiode/pH sensor front-ends |
| Supply Voltage Range | ±1 V to ±8 V dual or 2–16 V single; supports ultra-low-voltage battery operation down to 2 V |
| Quiescent Current | Pin-selectable: 10 μA / 100 μA / 1 mA; allows dynamic power/performance tuning per system requirement |
| Unity-Gain Bandwidth | 0.044 MHz (10 μA) to 1.4 MHz (1 mA); scales linearly with IQ for predictable bandwidth control |
| Input Offset Voltage | 2 mV max at +25°C, 3 mV max over 0–70°C; ensures precision DC gain stability in integrators and S/H circuits |
| Output Swing | ±0.96 V into 1 MΩ at 0–70°C; delivers >96% of rail-to-rail dynamic range for maximum signal fidelity |
| Input Impedance | 10¹² Ω; prevents loading of high-Z sources like glass electrodes and piezoelectric sensors |
Pinout & Package
ICL7614ACSA is housed in an 8-pin Small Outline (SO) package (SA code), surface-mount, RoHS-compliant, with 1.27 mm pitch and JEDEC MS-012AC outline.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OFFSET | Offset null adjustment terminal; connects to wiper of 25 kΩ potentiometer for VOS trimming |
| 2 | IN− | Inverting input; high-impedance CMOS node for feedback network connection |
| 3 | IN+ | Non-inverting input; accepts high-Z sensor signals without leakage-induced error |
| 4 | V− | Negative supply rail; supports operation down to −1 V (dual) or ground (single) |
| 5 | OUTPUT | CMOS output stage; swings within millivolts of rails, driving 1 MΩ loads directly |
| 6 | COMP | External compensation node; requires 39 pF capacitor to OUTPUT for unity-gain stability |
| 7 | IOSET | Quiescent current select input; tied to V+ (10 μA), mid-rail (100 μA), or V− (1 mA) |
| 8 | V+ | Positive supply rail; accepts up to +8 V (dual) or +16 V (single) with 18 V absolute max |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | 1 pA typical enables accurate integration over hours in long-time-constant circuits |
| Programmable quiescent current | Three discrete IQ settings allow precise optimization of bandwidth vs. battery life in portable designs |
| External frequency compensation | COMP pin permits bandwidth extension beyond unity-gain limits of internal-compensated op-amps |
| Rail-to-rail output swing | ±0.96 V into 1 MΩ preserves full dynamic range in low-voltage, high-resolution data acquisition |
| Offset null capability | Dedicated OFFSET pins support calibration of DC errors in precision transducer signal chains |
| High input impedance | 10¹² Ω minimizes signal attenuation and bias-induced drift in pH meter and photodiode interfaces |
Applications
| pH Meter Front-End | Photodiode Transimpedance Amplifier |
|---|---|
|
Use Scenario: High-impedance glass electrode (≥10⁹ Ω) measuring solution acidity in portable or lab-grade analyzers. IC Role / Device Role / Timing Role: Precision DC-coupled amplifier with offset nulling and ultra-low IB to prevent electrode polarization and drift. Use Value: 1 pA bias current avoids >1 mV error across 1 GΩ source; 2 mV VOS max ensures <0.01 pH uncertainty at 25°C. |
Use Scenario: Converting weak photocurrent (pA–nA) from scientific or medical photodiodes into measurable voltage. IC Role / Device Role / Timing Role: Low-noise, high-Z transimpedance amplifier with programmable IQ to balance dark-current rejection and response speed. Use Value: 0.01 pA/√Hz current noise and 10¹² Ω RIN preserve SNR; 10–100 μA IQ setting optimizes settling time for pulsed-light detection. |
| Low-Droop Sample-and-Hold Circuit | Picoammeter Input Stage |
|
Use Scenario: Holding analog sensor outputs for ADC conversion in battery-powered data loggers with multi-second hold times. IC Role / Device Role / Timing Role: Ultra-low-leakage buffer and integrator core; IOSET pin sets IQ to minimize hold-mode droop. Use Value: 1 pA IB limits droop to <1 mV/s on 1 μF hold capacitor; external compensation ensures stability during acquisition/hold transitions. |
Use Scenario: Measuring leakage currents in semiconductor device testing, insulation resistance, or electrochemical cells. IC Role / Device Role / Timing Role: Primary current-to-voltage converter with guarded input and calibrated offset nulling. Use Value: Guaranteed ≤4 nA max IB at +125°C enables sub-picoampere resolution; 25 kΩ offset pot supports full-scale calibration across VOS spread. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-bias-current op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC27L1CDR | Fixed 10 μA IQ; no external compensation; 2.5 mV VOS max; SO-8 package | Lacks programmable IQ and COMP pin - limited bandwidth flexibility and no gain ≥20 stability guarantee | Select when fixed low-power operation suffices and external compensation is unnecessary |
| OPA376AIDBVR | Auto-zero architecture; 760 nA max IB; 25 μV VOS; 5.5 MHz GBW; rail-to-rail I/O | Higher bias current invalidates picoampere sensing; superior DC precision but incompatible with ultra-high-Z sources | Select only for microvolt-offset-critical apps where IB >100× higher is acceptable |
Compared with TLC27L1CDR, ICL7614ACSA offers selectable IQ and external compensation for wider gain/bandwidth control; compared with OPA376AIDBVR, it provides 1000× lower input bias current essential for true picoammeter and pH meter use - trading auto-zero DC accuracy for femtoampere-level input integrity.
Availability
ICL7614ACSA is available at Aetrix Electronics and suitable for battery-powered instruments, low-leakage amplifiers, and long-time-constant integrators requiring stable component supply across industrial and medical OEM programs.
Supply support for ICL7614ACSA 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 precision analog, mixed-signal, and power-management ICs for demanding industrial, medical, and communications systems.
The ICL761X family was engineered specifically for ultra-low-input-current, low-power signal conditioning in high-impedance sensor interfaces - prioritizing bias current, supply flexibility, and stability over raw speed or auto-zero correction.
FAQ
What is the function of the IOSET pin on the ICL7614ACSA?
The IOSET pin on the ICL7614ACSA selects quiescent current: connect to V+ for 10 μA, to a mid-supply voltage (V− + 0.8 V to V+ − 0.8 V) for 100 μA, or to V− for 1 mA. This directly controls unity-gain bandwidth (0.044–1.4 MHz) and slew rate (0.016–1.6 V/µs), enabling power-performance trade-offs in the ICL7614ACSA design.
Does the ICL7614ACSA require external compensation, and if so, what value is recommended?
Yes, the ICL7614ACSA requires external compensation via a capacitor between COMP (pin 6) and OUTPUT (pin 5). A 39 pF capacitor ensures unity-gain stability; reducing this value increases bandwidth and slew rate but may compromise phase margin. This distinguishes the ICL7614ACSA from internally compensated variants like the ICL7611.
What is the maximum input common-mode voltage range for the ICL7614ACSA at 10 μA quiescent current?
At IQ = 10 μA and VSUPP = ±5 V, the ICL7614ACSA supports a common-mode input voltage range of −4.0 V to +4.4 V. This extends beyond the rails in the negative direction, enabling operation with inputs near V− - critical for single-supply sensor interfaces where the ICL7614ACSA must accept signals referenced to ground.
Can the ICL7614ACSA be used in a single-supply configuration, and what is the minimum supply voltage?
Yes, the ICL7614ACSA operates from a single supply of 2 V to 16 V. At 2 V, it maintains functionality with reduced output swing and bandwidth - verified in datasheet Figure 17 (Supply Current vs. Supply Voltage). This makes the ICL7614ACSA viable for coin-cell-powered devices where headroom is constrained.
How is input offset voltage nulled on the ICL7614ACSA?
Input offset voltage on the ICL7614ACSA is nulled using the two OFFSET pins (pins 1 and 8 per datasheet top view): connect a 25 kΩ potentiometer between them, with the wiper tied to V+. Nulling range is sufficient for all VOS grades at IQ = 100 μA or 1 mA; at 10 μA, higher-VOS grades (e.g., 5 mV) may not fully null - a key design constraint for the ICL7614ACSA.
ICL7614ACSA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.16V/µs
- Gain Bandwidth Product:
- 480 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 2 mV
- Current - Supply:
- 100µA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2 V
- Voltage - Supply Span (Max):
- 16 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ICL7614ACSA FAQ
1.How can I place an order for ICL7614ACSA through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7614ACSA 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 ICL7614ACSA reliable?
The price and inventory of ICL7614ACSA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7614ACSA is usually 5 days.
3.What payment methods are accepted for ICL7614ACSA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7614ACSA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7614ACSA?
ICL7614ACSA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7614ACSA 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 ICL7614ACSA?
For technical support, including ICL7614ACSA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7614ACSA requirements.
6.How does Aetrix verify that ICL7614ACSA is sourced from the original manufacturer or authorized distributors?
All ICL7614ACSA 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 ICL7614ACSA meets industry standards.
7.What is the process for return or replacement of ICL7614ACSA?
All ICL7614ACSA units undergo pre-shipment inspection (PSI). If there is an issue with ICL7614ACSA, 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 ICL7614ACSA part is unused and in its original packaging.
Return procedure for ICL7614ACSA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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