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Analog Devices Inc. ADA4666-2ARMZ
- Part No.:
- ADA4666-2ARMZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADA4666-2ARMZ.pdf
- Description:
- IC CMOS 2 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,640
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Product details
Overview
ADA4666-2 from Analog Devices is a dual CMOS rail-to-rail input/output operational amplifier optimized for low-power, wide-supply-voltage operation (3 V to 18 V single or ±1.5 V to ±9 V dual), delivering 4 MHz gain bandwidth, 725 µA supply current per amplifier, and 2.2 mV max offset voltage over full common-mode range - used in high-impedance sensor interfaces and battery-powered instrumentation.
For engineers reviewing the ADA4666-2 datasheet, ADA4666-2 pinout, ADA4666-2 application, or ADA4666-2 equivalent, this page provides verified package mapping (8-lead MSOP/LFCSP), validated rail-to-rail I/O performance at 3 V/10 V/18 V, confirmed −40°C to +125°C extended industrial temperature rating, and real-world design meaning for THD+N, noise, and channel separation.
Technical Context
The ADA4666-2 employs a CMOS input stage enabling 15 pA max input bias current and >10 GΩ input resistance, paired with a rail-to-rail output stage capable of sourcing/sinking 40 mA continuously. Its unity-gain stable architecture achieves 60° phase margin and 2.1 MHz closed-loop bandwidth at AV = 1.
It operates across three supply conditions (3 V, 10 V, 18 V) with guaranteed specs at each, including 120 dB min open-loop gain at 3 V and 147 dB typ at 18 V, and maintains 77–95 dB CMRR over full common-mode range (0 V to supply rail) and temperature (−40°C to +125°C).
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 - supports direct interface with 3.3 V, 5 V, 12 V, and 15 V systems without level-shifting. |
| Gain Bandwidth Product | 4 MHz typical - enables stable amplification of signals up to ~2.1 MHz in unity-gain configuration with 0.1% settling in 1.3 µs. |
| Input Offset Voltage | 2.2 mV maximum over full common-mode range and −40°C to +125°C - ensures <0.1% error in 12-bit precision current shunt monitoring at 100 mV full-scale. |
| Supply Current per Amplifier | 725 µA maximum at 25°C - allows dual-channel operation under 1.5 mA total, critical for portable medical devices running on coin-cell or Li-ion batteries. |
| Input Bias Current | 15 pA maximum at 25°C - preserves signal integrity in high-impedance pH or photodiode sensor nodes (>100 MΩ source impedance). |
| Rail-to-Rail I/O | Input range: 0 V to VS; Output swing: within 25 mV of rails (at 10 kΩ load) - maximizes dynamic range in single-supply data acquisition front-ends. |
| EMI Rejection Ratio | 60 dB at 2.4 GHz - suppresses cellular/WiFi interference in handheld test equipment and ECG monitors. |
Pinout & Package
ADA4666-2 is available in two RoHS-compliant packages: 8-lead MSOP (3.0 mm × 3.0 mm × 1.1 mm) and 8-lead LFCSP (3.0 mm × 3.0 mm × 0.8 mm), both with exposed pad (EPAD) connected to V− or left floating per datasheet Note 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT A) | Output, Channel A | Delivers rail-to-rail buffered signal; drives loads down to 1 kΩ while maintaining <200 mV dropout at +125°C. |
| 2 (−IN A) | Inverting Input, Channel A | High-impedance node (15 pA bias); connects to feedback network in transimpedance or inverting amplifier configurations. |
| 3 (+IN A) | Non-inverting Input, Channel A | CMOS input accepting 0 V to VS; used for high-Z sensor buffering or reference-level shifting. |
| 4 (V−) | Negative Supply Rail | Reference for internal circuitry and EPAD connection point; must be stable and low-noise for precision DC performance. |
| 5 (+IN B) | Non-inverting Input, Channel B | Independent high-Z input for second signal path; enables dual-channel differential sensing or active filtering. |
| 6 (−IN B) | Inverting Input, Channel B | Matches Channel A's bias and offset specs; supports matched dual gain stages in instrumentation amps. |
| 7 (OUT B) | Output, Channel B | Electrically isolated from OUT A; channel separation ≥80 dB prevents crosstalk in multi-channel data loggers. |
| 8 (V+) | Positive Supply Rail | Accepts up to 20.5 V absolute max; PSRR ≥120 dB rejects ripple from noisy DC/DC converters. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full utilization of 3 V to 18 V supply range - eliminates need for external level shifters in single-supply battery systems. |
| Low input bias current (15 pA max) | Maintains accuracy in high-impedance sensor interfaces (e.g., glass electrode pH probes, piezoresistive strain gauges) without guard traces or leakage compensation. |
| Wide supply range (3 V to 18 V) | Supports direct operation from unregulated battery stacks (e.g., 4×AA, 12 V lead-acid, 15 V industrial rails) without LDO pre-regulation. |
| Specified over −40°C to +125°C | Validated performance across automotive under-hood, industrial motor control, and outdoor instrumentation environments without derating. |
| EMI rejection up to 60 dB at 2.4 GHz | Reduces susceptibility to RF interference in wireless-connected medical wearables and IoT edge sensors without external shielding. |
Applications
| Current Shunt Monitoring | Active Filters |
|---|---|
|
Use Scenario: Precision measurement of motor phase current in BLDC inverters using 10 mΩ shunt resistors at 0–50 A range. IC Role / Device Role / Timing Role: Dual-channel difference amplifier with matched gain and offset for bidirectional current sensing. Use Value: 2.2 mV max VOS ensures ≤0.22% full-scale error at 1 V shunt drop; rail-to-rail output delivers full 0–3.3 V ADC input range. |
Use Scenario: 4th-order anti-aliasing filter preceding SAR ADC in portable oscilloscope front-end. IC Role / Device Role / Timing Role: Dual op-amp implementing two 2-pole Sallen-Key stages with unity-gain stability. Use Value: 4 MHz GBP enables accurate 1 MHz cutoff with <0.1 dB passband ripple; 1.3 µs 0.1% settling meets 1 MSPS sampling timing. |
| Portable Medical Equipment | Battery-Powered Instrumentation |
|
Use Scenario: Signal conditioning for dry-electrode ECG acquisition in handheld vital sign monitors. IC Role / Device Role / Timing Role: High-Z buffer and gain stage for ultra-low-current biopotential signals (<1 nA). Use Value: 15 pA max IB prevents electrode polarization drift; 3 µV p-p 0.1–10 Hz noise ensures clean 50 dB SNR at 1 kHz. |
Use Scenario: Sensor interface in handheld multimeter measuring thermocouple, RTD, and voltage simultaneously. IC Role / Device Role / Timing Role: Dual-channel multiplexed front-end amplifier supporting multiple input ranges and calibration paths. Use Value: 725 µA per amp enables 12-hour runtime on 2×AA cells; 120 dB min AVO guarantees <0.0025% nonlinearity over 16-bit dynamic range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADA4661-2 | Lower supply current (425 µA max), lower GBP (2.5 MHz), same 2.2 mV VOS spec, identical pinout and package. | Better suited for ultra-low-power (<1 mW) applications where bandwidth ≤1 MHz is sufficient. | Select ADA4661-2 when power budget is tighter than 1.5 mW and 4 MHz bandwidth is unnecessary. |
| AD8622 | Higher supply current (1.2 mA), higher GBP (25 MHz), lower VOS (125 µV typ), different pinout (SOIC-8 only), no LFCSP option. | Targeted at high-speed precision applications requiring faster settling and lower offset, but consumes >1.6× more power. | Select AD8622 only when sub-100 µV offset and >10 MHz bandwidth justify 3× higher quiescent power and SOIC-only layout. |
Compared with ADA4661-2, ADA4666-2 trades 2.5 MHz bandwidth for 4 MHz and adds 300 µA supply current to enable wider supply range (up to 18 V) and improved rail-to-rail output drive at high temperature; versus AD8622, it reduces power by 60% and supports compact LFCSP packaging but sacrifices offset and speed.
Availability
ADA4666-2 is available at Aetrix Electronics and suitable for current shunt monitors, active filters, portable medical equipment, buffer/level shifting, high impedance sensor interfaces, and battery powered instrumentation requiring stable component supply across automotive, industrial, and medical OEM programs.
Supply support for ADA4666-2 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, with design centers worldwide.
The ADA4666-2 belongs to Analog Devices' precision low-power op-amp product line, engineered specifically for wide-supply, rail-to-rail, extended-temperature applications in portable and harsh-environment instrumentation.
FAQ
What is the maximum supply voltage rating for the ADA4666-2?
The ADA4666-2 has an absolute maximum supply voltage rating of 20.5 V, with recommended operating range from 3 V to 18 V single supply or ±1.5 V to ±9 V dual supply. Operation beyond 18 V is not characterized and may compromise long-term reliability or parametric performance per the datasheet Absolute Maximum Ratings table.
Does the ADA4666-2 support true rail-to-rail input and output operation?
Yes, the ADA4666-2 supports rail-to-rail input (0 V to VS) and rail-to-rail output (within 25 mV of VS and V− at 10 kΩ load). This is verified across all specified supply voltages (3 V, 10 V, 18 V) and temperature (−40°C to +125°C), enabling full dynamic range utilization in single-supply systems.
What is the typical input bias current of the ADA4666-2, and how does it vary with temperature?
The ADA4666-2 specifies a maximum input bias current of 15 pA at 25°C, rising to 900 pA at +125°C (−40°C to +125°C range). This low and well-characterized bias current is enabled by its CMOS input stage and makes the ADA4666-2 suitable for high-impedance sensor interfacing where leakage-induced errors must be minimized.
Can the ADA4666-2 drive capacitive loads, and what is its stability behavior?
The ADA4666-2 is unity-gain stable and characterized for driving up to 50 pF capacitive loads without oscillation, as shown in Figure 43 and Figure 46 of the datasheet. For loads >50 pF, a series resistor (typically 10–100 Ω) between amplifier output and capacitor is recommended to maintain 60° phase margin and prevent peaking.
Is the ADA4666-2 qualified for automotive applications?
The ADA4666-2 is specified over the extended industrial temperature range (−40°C to +125°C) and packaged in AEC-Q200–compatible MSOP and LFCSP variants, but it is not officially AEC-Q100 qualified. For automotive applications requiring AEC-Q100 Grade 2 or 3 certification, designers should consult Analog Devices' automotive-grade alternatives such as the ADA4625-2.
ADA4666-2ARMZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- 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:
- 500 µV
- Current - Supply:
- 630µA (x2 Channels)
- Current - Output / Channel:
- 220 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-MSOP
ADA4666-2ARMZ FAQ
1.How can I place an order for ADA4666-2ARMZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADA4666-2ARMZ 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 ADA4666-2ARMZ reliable?
The price and inventory of ADA4666-2ARMZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADA4666-2ARMZ is usually 5 days.
3.What payment methods are accepted for ADA4666-2ARMZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADA4666-2ARMZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADA4666-2ARMZ?
ADA4666-2ARMZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADA4666-2ARMZ 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 ADA4666-2ARMZ?
For technical support, including ADA4666-2ARMZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADA4666-2ARMZ requirements.
6.How does Aetrix verify that ADA4666-2ARMZ is sourced from the original manufacturer or authorized distributors?
All ADA4666-2ARMZ 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 ADA4666-2ARMZ meets industry standards.
7.What is the process for return or replacement of ADA4666-2ARMZ?
All ADA4666-2ARMZ units undergo pre-shipment inspection (PSI). If there is an issue with ADA4666-2ARMZ, 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 ADA4666-2ARMZ part is unused and in its original packaging.
Return procedure for ADA4666-2ARMZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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