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Analog Devices Inc. ADA4661-2ACPZ-RL
- Part No.:
- ADA4661-2ACPZ-RL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-WFDFN Exposed Pad, CSP
- Datasheet:
-
ADA4661-2ACPZ-RL.pdf
- Description:
- IC CMOS 2 CIRCUIT 8LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:4,288
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Product details
Overview
ADA4661-2ACPZ-RL from Analog Devices is a dual, precision, rail-to-rail input/output CMOS operational amplifier optimized for low-power, high-voltage (up to 18 V), and wide-supply applications. It delivers 4 MHz gain bandwidth, 725 µA supply current per amplifier, 150 µV max offset voltage at mid-supply, and operates across −40°C to +125°C - ideal for current shunt monitors and battery-powered instrumentation.
For engineers reviewing the ADA4661-2ACPZ-RL datasheet, ADA4661-2ACPZ-RL pinout, ADA4661-2ACPZ-RL application, or ADA4661-2ACPZ-RL equivalent, key selection criteria include its 15 pA max input bias current, rail-to-rail I/O swing, 18 V operation capability, and LFCSP-8 package compatibility with space-constrained industrial sensor interfaces.
Technical Context
The ADA4661-2ACPZ-RL uses Analog Devices' patented DigiTrim® trimming to achieve low offset voltage stability over temperature and common-mode range. Its architecture ensures high PSRR (145 dB typ) and CMRR (135 dB typ) within −VSY + 1.5 V to +VSY − 1.5 V common-mode range, enabling accurate signal conditioning in noisy single-supply systems.
It supports unity-gain stability with 60° phase margin and drives capacitive loads up to 50 pF without oscillation. The device maintains 2.1 MHz −3 dB closed-loop bandwidth at AV = 1 and achieves 1.3 µs settling time to 0.1% for 1 V step inputs - critical for precision active filter and buffer/level-shifting stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3 V to 18 V single supply or ±1.5 V to ±9 V dual supply - enables direct interface with 3.3 V, 5 V, 12 V, and 15 V systems. |
| Gain Bandwidth Product | 4 MHz typical - supports stable amplification of signals up to ~2.1 MHz in unity-gain configuration. |
| Input Offset Voltage | 150 µV maximum at VSY/2 - ensures <0.01% error in mV-level sensor signal amplification at room temperature. |
| Input Bias Current | 15 pA maximum - preserves signal integrity in high-impedance sensor interfaces (e.g., pH electrodes, piezoresistive bridges). |
| Output Swing | Rail-to-rail output: VOL ≤ 25 mV and VOH ≥ 17.95 V at 18 V supply with 10 kΩ load - maximizes dynamic range in low-headroom systems. |
| Operating Temperature | −40°C to +125°C extended industrial range - qualified for under-hood automotive, motor control, and industrial PLC analog front-ends. |
| EMI Rejection Ratio | 60 dB at 2.4 GHz - suppresses RF interference in wireless-adjacent medical or portable instrumentation designs. |
Pinout & Package
ADA4661-2ACPZ-RL is packaged in an 8-lead LFCSP (3 mm × 3 mm) with exposed pad. The exposed pad must be connected to V− or left unconnected per datasheet guidance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT A | Amplifier A output | Delivers rail-to-rail buffered signal; capable of sourcing/sinking 40 mA continuous current. |
| −IN A | Inverting input, Channel A | High-impedance node (RIN >10 GΩ); accepts signals from 0 V to VSY across full temperature range. |
| +IN A | Non-inverting input, Channel A | Matches −IN A in bias current and capacitance; enables precision differential or single-ended sensing. |
| V− | Negative supply rail | Reference for internal circuitry; exposed pad connection point for thermal and noise performance optimization. |
| +IN B | Non-inverting input, Channel B | Independent second channel input; identical specs to Channel A for dual-signal processing. |
| −IN B | Inverting input, Channel B | Electrically isolated from Channel A; supports independent gain configurations without crosstalk (80 dB typical). |
| OUT B | Amplifier B output | Functionally identical to OUT A; enables dual-channel buffering, filtering, or differential drive. |
| V+ | Positive supply rail | Accepts up to 20.5 V absolute max; PSRR of 145 dB minimizes supply ripple coupling into output. |
Key Features
| Feature | Design Value |
|---|---|
| DigiTrim® offset calibration | Reduces initial VOS to ≤150 µV and drift to ≤3.1 µV/°C - eliminates need for external nulling in production calibration. |
| Rail-to-rail input and output | Supports full 0 V to 18 V input common-mode range and output swing within 25 mV of rails - maximizes usable ADC input range. |
| Low power at high voltage | 725 µA per amplifier at 18 V - enables dual-channel precision amplification in 12–18 V battery-powered devices without thermal derating. |
| High EMI immunity | 60 dB rejection at 2.4 GHz - prevents cellular/Wi-Fi interference from corrupting sensitive biomedical or sensor measurements. |
| Unity-gain stable | No external compensation required - simplifies PCB layout for gain-of-1 buffers and level shifters in compact layouts. |
Applications
| Current Shunt Monitor | Active Filter |
|---|---|
Use Scenario: High-side current sensing in 12 V motor control with 50 mΩ shunt resistor. IC Role / Device Role / Timing Role: Precision difference amplifier with matched input resistors rejecting common-mode voltage up to 12 V. Use Value: 150 µV max VOS ensures <0.3% measurement error at 1 A sense current; rail-to-rail output directly interfaces 12-bit SAR ADC. | Use Scenario: 2nd-order Sallen-Key low-pass filter for ECG front-end with 150 Hz cutoff. IC Role / Device Role / Timing Role: Dual-channel op amp implementing unity-gain buffer and filter stage with minimal phase distortion. Use Value: 4 MHz GBP and 60° phase margin ensure stable filter response; 15 pA IB avoids capacitor leakage errors in high-Q designs. |
| Portable Medical Equipment | Battery Powered Instrumentation |
Use Scenario: Signal conditioning for handheld pulse oximeter using photodiode transimpedance stage. IC Role / Device Role / Timing Role: Low-noise, low-input-bias transimpedance amplifier with rail-to-rail output driving ADC reference buffer. Use Value: 18 nV/√Hz voltage noise and 360 fA/√Hz current noise preserve weak optical signal SNR; 725 µA quiescent current extends AA battery life. | Use Scenario: Precision voltage reference buffer and sensor excitation driver in handheld multimeter. IC Role / Device Role / Timing Role: Dual-channel buffer isolating 2.5 V reference and driving 100 Ω RTD sensor bridge. Use Value: 150 µV VOS and 115 dB CMRR reject supply and layout-induced errors; 3 V to 18 V operation supports both alkaline and Li-ion battery chemistries. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADA4666-2ACPZ-RL | Higher supply current (1.2 mA vs. 0.725 mA), same 4 MHz GBP and rail-to-rail I/O - optimized for speed/power trade-off. | Preferred where faster settling (0.9 µs) justifies higher power; not suitable for ultra-low-power battery designs. | Select ADA4666-2ACPZ-RL only when >3.5 MHz closed-loop bandwidth or sub-1 µs settling is required. |
| AD8622ARMZ-REEL | Lower GBP (2.5 MHz), higher VOS (125 µV max), same 15 pA IB - older generation with reduced bandwidth and temperature range (−40°C to +105°C). | Suitable for cost-sensitive industrial controls where 2.1 MHz bandwidth suffices and extended temp rating is unnecessary. | Choose AD8622ARMZ-REEL only if legacy design reuse or lower unit cost outweighs bandwidth and temperature requirements. |
Compared with ADA4666-2ACPZ-RL and AD8622ARMZ-REEL, the ADA4661-2ACPZ-RL uniquely balances 4 MHz bandwidth, 725 µA power, and −40°C to +125°C operation - making it optimal for next-generation portable medical and high-reliability industrial sensors where all three parameters are simultaneously constrained.
Availability
ADA4661-2ACPZ-RL is available at Aetrix Electronics and suitable for current shunt monitors, active filters, and portable medical equipment requiring stable component supply across extended temperature and voltage ranges.
Supply support for ADA4661-2ACPZ-RL 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
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The ADA4661-2 product line targets precision, low-power, high-voltage signal conditioning in harsh environments - designed specifically for industrial, medical, and test equipment demanding rail-to-rail operation and extended temperature reliability.
FAQ
What is the maximum supply voltage for ADA4661-2ACPZ-RL?
The ADA4661-2ACPZ-RL has an absolute maximum supply voltage rating of 20.5 V. Continuous operation is specified from 3 V to 18 V single supply or ±1.5 V to ±9 V dual supply. Exceeding 20.5 V risks permanent damage per the Absolute Maximum Ratings table in the datasheet.
Does ADA4661-2ACPZ-RL support rail-to-rail input and output?
Yes, ADA4661-2ACPZ-RL supports true rail-to-rail input and output. Its input common-mode range extends from (V−) to (V+), and output swings within 25 mV of either rail at 10 kΩ load - verified across −40°C to +125°C and all supply voltages from 3 V to 18 V.
What is the input bias current specification for ADA4661-2ACPZ-RL?
The ADA4661-2ACPZ-RL specifies a maximum input bias current of 15 pA at 25°C, rising to 900 pA over the full −40°C to +125°C range. This ultra-low IB enables high-impedance sensor interfacing without significant DC error or signal loading.
Is ADA4661-2ACPZ-RL unity-gain stable?
Yes, ADA4661-2ACPZ-RL is unity-gain stable with 60° phase margin at 4 MHz crossover. No external compensation is required for gain-of-1 configurations, simplifying design of buffers and level shifters while maintaining stability with 10 pF capacitive loads.
What package type is used for ADA4661-2ACPZ-RL?
ADA4661-2ACPZ-RL uses an 8-lead LFCSP package (3 mm × 3 mm) with exposed pad. The part number suffix "ACPZ" explicitly denotes this lead-frame chip-scale package, distinct from the MSOP variant (ADA4661-2ARMZ).
ADA4661-2ACPZ-RL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad, CSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- CMOS
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 2V/µs
- Gain Bandwidth Product:
- 4 MHz
- -3db Bandwidth:
- 2.1 MHz
- Current - Input Bias:
- 0.5 pA
- Voltage - Input Offset:
- 30 µV
- Current - Supply:
- 630µA (x2 Channels)
- Current - Output / Channel:
- 40 mA
- Voltage - Supply Span (Min):
- 3 V
- Voltage - Supply Span (Max):
- 18 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-LFCSP-WD (3x3)
ADA4661-2ACPZ-RL FAQ
1.How can I place an order for ADA4661-2ACPZ-RL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADA4661-2ACPZ-RL 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 ADA4661-2ACPZ-RL reliable?
The price and inventory of ADA4661-2ACPZ-RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADA4661-2ACPZ-RL is usually 5 days.
3.What payment methods are accepted for ADA4661-2ACPZ-RL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADA4661-2ACPZ-RL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADA4661-2ACPZ-RL?
ADA4661-2ACPZ-RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADA4661-2ACPZ-RL 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 ADA4661-2ACPZ-RL?
For technical support, including ADA4661-2ACPZ-RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADA4661-2ACPZ-RL requirements.
6.How does Aetrix verify that ADA4661-2ACPZ-RL is sourced from the original manufacturer or authorized distributors?
All ADA4661-2ACPZ-RL 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 ADA4661-2ACPZ-RL meets industry standards.
7.What is the process for return or replacement of ADA4661-2ACPZ-RL?
All ADA4661-2ACPZ-RL units undergo pre-shipment inspection (PSI). If there is an issue with ADA4661-2ACPZ-RL, 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 ADA4661-2ACPZ-RL part is unused and in its original packaging.
Return procedure for ADA4661-2ACPZ-RL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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