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Analog Devices Inc. AD8657ARMZ
- Part No.:
- AD8657ARMZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD8657ARMZ.pdf
- Description:
- IC CMOS 2 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,167
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Product details
Overview
AD8657ARMZ from Analog Devices is a dual, micropower, precision rail-to-rail input/output operational amplifier optimized for low-power, wide-supply-voltage applications. It delivers 22 μA max quiescent current per amplifier at 18 V, 350 μV max offset voltage, and 20 pA max input bias current across −40°C to +125°C, enabling high-accuracy current monitoring in 4 mA to 20 mA loop drivers.
For engineers reviewing the AD8657ARMZ datasheet, AD8657ARMZ pinout, AD8657ARMZ application, or AD8657ARMZ equivalent, this page provides verified specifications, package mapping (8-lead MSOP), functional pin definitions, real-world use cases in sensor front ends and process control, and two validated alternative parts with documented technical and application differences.
Technical Context
The AD8657ARMZ employs Analog Devices' patented DigiTrim® trimming for low offset voltage stability over temperature and supply voltage. Its rail-to-rail input and output stages support operation from 2.7 V to 18 V single supply (±1.35 V to ±9 V dual), with unity-gain stability and 230 kHz gain bandwidth product at AV = 100.
It features high electromagnetic interference immunity (90 dB EMI rejection ratio at 400–2400 MHz), 110 dB CMRR at 25°C, and 120 dB open-loop gain - all maintained across its extended industrial temperature range, making it suitable for harsh-environment signal conditioning where precision and power efficiency are co-constrained.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 22 μA max per amplifier at 18 V - enables multi-year battery life in portable sensors and wireless transmitters. |
| Input Offset Voltage | 350 μV max at 25°C - ensures ≤0.002% gain error in precision current-sense amplifiers at 100 mV full-scale. |
| Input Bias Current | 20 pA max - preserves signal integrity when interfacing with high-impedance sources like pH electrodes or piezoelectric sensors. |
| Gain Bandwidth Product | 230 kHz at AV = 100 - supports stable closed-loop operation up to ~300 kHz for anti-aliasing and multipole filter designs. |
| Rail-to-Rail I/O | Input range: 0 V to VS; Output swing: within 30 mV of rails at 100 kΩ load - maximizes dynamic range in single-supply systems. |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive, motor control feedback, and industrial process instrumentation. |
| EMI Rejection Ratio | 90 dB at 400/900/1800/2400 MHz - suppresses RF-induced errors in noisy factory or wireless co-location environments. |
Pinout & Package
The AD8657ARMZ is packaged in an 8-lead MSOP (RM-8) with exposed pad option; pin 1 is OUT A, pin 2 is −IN A, pin 3 is +IN A, pin 4 is V−, pin 5 is +IN B, pin 6 is −IN B, pin 7 is OUT B, and pin 8 is V+.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT A) | Output Channel A | Amplified output of first op amp; capable of sourcing/sinking ±12 mA, swings rail-to-rail under 100 kΩ load. |
| 2 (−IN A) | Inverting Input Channel A | Differential input node; 10 GΩ input resistance and 11 pF differential capacitance enable stable high-Z feedback networks. |
| 3 (+IN A) | Noninverting Input Channel A | High-impedance input with 20 pA max bias current; EMI-optimized layout reduces RF rectification in noisy environments. |
| 4 (V−) | Negative Supply Rail | Reference for internal circuitry; exposed pad (if present) must be connected to V− or left floating per datasheet Figure 4. |
| 5 (+IN B) | Noninverting Input Channel B | Independent second input; identical specs to Channel A - supports dual-path signal conditioning without cross-talk degradation. |
| 6 (−IN B) | Inverting Input Channel B | Second differential input; channel separation >95 dB at 10 kHz ensures minimal crosstalk in dual-channel configurations. |
| 7 (OUT B) | Output Channel B | Second independent output; matched DC and AC performance to OUT A enables precision dual-buffer or differential driver topologies. |
| 8 (V+) | Positive Supply Rail | Primary power input; PSRR >100 dB allows operation directly from unregulated battery or SMPS outputs with minimal ripple coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower at high voltage | 22 μA max per amplifier at 18 V - enables dual-op-amp functionality in sub-50 μA system budgets. |
| Precision trimming | DigiTrim® technology achieves 350 μV max VOS and 2 μV/°C drift - eliminates need for external nulling in production calibration. |
| Rail-to-rail I/O | Full 0 V to 18 V input range and 30 mV from rails output swing - preserves signal fidelity in single-supply 12-bit+ ADC interfaces. |
| EMI immunity | 90 dB rejection at cellular/WiFi frequencies - prevents false triggering or offset shifts in wireless sensor nodes near transceivers. |
| Wide supply range | Operates from 2.7 V to 18 V single supply - supports direct connection to Li-ion, 9 V batteries, or industrial 12–24 V rails without LDOs. |
Applications
| Current Monitoring in Motor Control | 4–20 mA Loop Driver |
|---|---|
Use Scenario: Real-time phase current sensing in BLDC motor inverters using shunt resistors. IC Role / Device Role / Timing Role: Precision current-sense amplifier with rail-to-rail output driving ADC input. Use Value: 20 pA input bias current avoids shunt measurement error; 350 μV offset limits current error to <100 μA at 100 mV sense drop. | Use Scenario: Transmitting analog sensor data over industrial 4–20 mA current loops. IC Role / Device Role / Timing Role: Dual op amp configured as precision voltage-to-current converter and loop buffer. Use Value: 22 μA supply current minimizes loop power overhead; 120 dB open-loop gain ensures <0.1% linearity over full 16 mA span. |
| Remote Wireless Sensor Front End | Low-Power Multipole Filter |
Use Scenario: Signal conditioning for battery-powered environmental sensors (e.g., CO₂, humidity) transmitting via LoRaWAN. IC Role / Device Role / Timing Role: High-impedance buffer and dc-coupled gain stage before SAR ADC. Use Value: 10 GΩ input resistance preserves signal integrity from high-Z electrochemical sensors; 22 μA current extends 10-year battery life. | Use Scenario: Anti-aliasing and noise filtering in portable medical devices (e.g., ECG front ends). IC Role / Device Role / Timing Role: Dual op amp implementing 4th-order active low-pass filter. Use Value: Unity-gain stability and 230 kHz GBP allow precise cutoff at 10–50 kHz without peaking; rail-to-rail output avoids clipping on ±1.5 V supplies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision micropower op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8605ARTZ-REEL7 | Single-channel, 1 μA supply current, 65 μV offset, 50 kHz GBP - lower power but reduced bandwidth and accuracy. | Best for ultra-low-power wake-up circuits or nanopower comparators; not suitable for 4–20 mA drivers requiring dual channels. | Select when system-level power budget is <5 μA per channel and bandwidth <10 kHz suffices. |
| ADA4091-2ARZ | Dual-channel, 200 μA supply current, 125 μV offset, 1.2 MHz GBP - higher speed and lower offset, but 9× higher quiescent current. | Preferred for higher-bandwidth sensor interfaces (e.g., vibration monitoring) where 22 μA constraint is relaxed. | Select when ≥1 MHz closed-loop bandwidth or <150 μV offset is required, and power budget allows ≥200 μA per amplifier. |
Compared with AD8657ARMZ, AD8605ARTZ-REEL7 trades bandwidth and dual-channel capability for extreme micropower, while ADA4091-2ARZ sacrifices power efficiency for superior precision and speed - enabling selection based on whether power, channel count, or dynamic performance dominates the design priority.
Availability
AD8657ARMZ is available at Aetrix Electronics and suitable for current monitoring in motor control, 4 mA to 20 mA loop drivers, and remote wireless sensor front ends requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD8657ARMZ 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 AD8657/AD8659 family was designed specifically for precision, low-power signal conditioning in battery-operated and industrial process control systems - balancing micropower consumption, rail-to-rail operation, and robust EMI immunity.
FAQ
What is the maximum supply voltage rating for the AD8657ARMZ?
The AD8657ARMZ has an absolute maximum supply voltage rating of 20.5 V, with recommended operating range from 2.7 V to 18 V single supply (±1.35 V to ±9 V dual). Exceeding 20.5 V risks permanent damage per the Absolute Maximum Ratings table. The AD8657ARMZ is rated for continuous operation at 18 V, delivering 22 μA typical supply current and maintaining rail-to-rail output swing down to 30 mV from each rail.
Does the AD8657ARMZ support rail-to-rail input and output simultaneously?
Yes, the AD8657ARMZ supports true rail-to-rail input and output operation. Its input common-mode range extends from 0 V to VS, and its output can swing within 30 mV of both supply rails under 100 kΩ load at −40°C to +125°C. This capability is confirmed in Table 2 (Output Voltage High/Low) and General Description section, enabling full utilization of supply headroom in single-supply systems such as portable instrumentation and 4–20 mA loop drivers.
What is the purpose of the exposed pad on the AD8657ARMZ MSOP package?
The AD8657ARMZ in MSOP (RM-8) packaging does not include an exposed pad - that feature applies only to the LFCSP variant (CP-8-11). The MSOP version uses standard leadframe thermal conduction. Per datasheet Figure 4 and Table 7, the 8-lead MSOP has no EPAD terminal; thermal resistance θJA is 142°C/W. Confusion may arise from dual-package documentation, but AD8657ARMZ specifically denotes the MSOP variant with no exposed pad requirement.
How does the AD8657ARMZ perform in EMI-prone environments like factory floors?
The AD8657ARMZ delivers 90 dB EMI rejection ratio at 400 MHz, 900 MHz, 1800 MHz, and 2400 MHz - a key specification validated in Table 2 and Applications Information section. This immunity stems from proprietary input-stage design and layout, preventing RF rectification that causes offset shifts or false triggering. In practice, it maintains stable 350 μV offset and <10 nA input current error when placed near variable-frequency drives or WiFi modules, unlike non-EMI-hardened op amps.
Can the AD8657ARMZ be used as a comparator?
While the AD8657ARMZ is not characterized or guaranteed as a comparator, the datasheet explicitly includes a "Comparator Operation-AD8657" section (page 21) confirming functional use in open-loop mode. However, it lacks internal hysteresis and has slow recovery from saturation (see Figure 50), resulting in unpredictable propagation delay and potential oscillation. For reliable comparison, a dedicated comparator like ADCMP341 is recommended; the AD8657ARMZ should only be used as a comparator in non-critical, low-speed applications where timing uncertainty is acceptable.
AD8657ARMZ 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:
- 0.08V/µs
- Gain Bandwidth Product:
- 200 kHz
- -3db Bandwidth:
- 305 kHz
- Current - Input Bias:
- 5 pA
- Voltage - Input Offset:
- 350 µV
- Current - Supply:
- 18µA (x2 Channels)
- Current - Output / Channel:
- 12 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 18 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
AD8657ARMZ FAQ
1.How can I place an order for AD8657ARMZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8657ARMZ 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 AD8657ARMZ reliable?
The price and inventory of AD8657ARMZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8657ARMZ is usually 5 days.
3.What payment methods are accepted for AD8657ARMZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8657ARMZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8657ARMZ?
AD8657ARMZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8657ARMZ 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 AD8657ARMZ?
For technical support, including AD8657ARMZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8657ARMZ requirements.
6.How does Aetrix verify that AD8657ARMZ is sourced from the original manufacturer or authorized distributors?
All AD8657ARMZ 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 AD8657ARMZ meets industry standards.
7.What is the process for return or replacement of AD8657ARMZ?
All AD8657ARMZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8657ARMZ, 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 AD8657ARMZ part is unused and in its original packaging.
Return procedure for AD8657ARMZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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