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Analog Devices Inc. AD8657ACPZ-R7
- Part No.:
- AD8657ACPZ-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-WFDFN Exposed Pad, CSP
- Datasheet:
-
AD8657ACPZ-R7.pdf
- Description:
- IC CMOS 2 CIRCUIT 8LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:1,301
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Product details
Overview
AD8657ACPZ-R7 from Analog Devices is a dual, micropower, rail-to-rail input/output precision operational amplifier optimized for low-power, wide-supply-voltage applications. It delivers 22 μA maximum quiescent current per amplifier, 350 μV maximum offset voltage, and 20 pA maximum input bias current across a 2.7 V to 18 V supply range-enabling high-accuracy current monitoring in 4 mA to 20 mA loop drivers and sensor front ends for remote industrial sensors.
For engineers reviewing the AD8657ACPZ-R7 datasheet, AD8657ACPZ-R7 pinout, AD8657ACPZ-R7 application, or AD8657ACPZ-R7 equivalent, this page provides verified specifications, package mapping to the 8-lead LFCSP, functional pin definitions, real-world use cases in process control and wireless sensing, and two validated alternative parts with documented technical and application differences.
Technical Context
The AD8657ACPZ-R7 employs Analog Devices' patented DigiTrim® trimming technique to achieve low offset voltage without laser trimming. Its CMOS input stage enables femtoampere-level input bias current stability over temperature and common-mode voltage, while rail-to-rail input/output swing supports full dynamic range utilization in single-supply systems down to 2.7 V.
It features unity-gain stability, 230 kHz gain bandwidth product (at AV = 100), and 305 kHz −3 dB closed-loop bandwidth-making it suitable for precision dc gain stages, multipole active filters, and low-noise transimpedance amplifiers where phase margin (60°) and EMI immunity (>90 dB at 400–2400 MHz) are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7 V to 18 V single-supply; ±1.35 V to ±9 V dual-supply - enables direct interface with 3.3 V, 5 V, 12 V, and 15 V industrial rails. |
| Quiescent Current per Amp | 18–22 μA typical/max at 25°C - supports battery-powered operation >10 years in low-duty-cycle sensor nodes. |
| Input Offset Voltage | 350 μV max at 25°C; 2 mV max over −40°C to +125°C - ensures <0.01% gain error in 100× current-sense amplifiers. |
| Input Bias Current | 20 pA max at 25°C - preserves signal integrity in high-impedance pH, thermopile, or piezoelectric sensor interfaces. |
| Gain Bandwidth Product | 230 kHz at AV = 100 - supports stable 100× gain in precision instrumentation with <15 µs settling to 0.1%. |
| Output Swing | Rail-to-rail: VOL ≤ 30 mV, VOH ≥ 17.97 V at 18 V supply - maximizes ADC input range without level-shifting circuitry. |
| EMI Rejection Ratio | 90 dB at 400/900/1800/2400 MHz - suppresses RF-induced errors in noisy factory or wireless gateway environments. |
Pinout & Package
The AD8657ACPZ-R7 is packaged in an 8-lead LFCSP (Lead Frame Chip Scale Package) with exposed pad (EPAD). The EPAD must be connected to V− or left unconnected per datasheet Note 1. This thermally enhanced package achieves θJA = 75°C/W and θJC = 12°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT A) | Amplifier A output | Drives feedback network or load; rail-to-rail capable up to ±12 mA short-circuit current. |
| 2 (−IN A) | Inverting input A | Accepts feedback signal; high-impedance CMOS node with 10 GΩ input resistance. |
| 3 (+IN A) | Noninverting input A | Connects to high-Z sensor or reference; matched to −IN A for <40 pA offset current. |
| 4 (V−) | Negative supply | Reference for both amplifiers; EPAD must tie here for optimal thermal performance. |
| 5 (+IN B) | Noninverting input B | Independent channel input; identical specs to Channel A for dual-channel signal conditioning. |
| 6 (−IN B) | Inverting input B | Supports independent feedback paths; channel separation >95 dB at 10 kHz prevents crosstalk. |
| 7 (OUT B) | Amplifier B output | Enables dual-path buffering or differential drive without external components. |
| 8 (V+) | Positive supply | Accepts up to 20.5 V absolute max; PSRR >100 dB rejects supply ripple in noisy power domains. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 22 μA max per amplifier at 18 V enables multi-year battery life in portable gas monitors and handheld meters. |
| Precision offset performance | 350 μV max offset + 2 μV/°C drift allows direct dc coupling in 16-bit DAQ front ends without calibration. |
| Rail-to-rail I/O | Full 0 V to 18 V input range and output swing to within 30 mV of rails maximizes dynamic range in 3.3 V–18 V systems. |
| High EMI immunity | 90 dB rejection at cellular/WiFi frequencies eliminates need for external RF filtering in industrial IoT gateways. |
| Extended temperature range | Specified from −40°C to +125°C supports deployment in motor drives, solar inverters, and automotive under-hood modules. |
Applications
| Current Monitoring in Process Control | Remote Wireless Sensor Front End |
|---|---|
Use Scenario: Measuring loop current in 4 mA to 20 mA industrial transmitters with ±0.1% accuracy over temperature. IC Role / Device Role / Timing Role: Precision current-sense amplifier with low IB and VOS to convert shunt voltage to buffered output. Use Value: 20 pA input bias avoids loading high-value shunts; 350 μV offset contributes <0.002% error at 20 mA full scale. | Use Scenario: Amplifying low-level signals from thermopiles, RTDs, or MEMS accelerometers in battery-powered field nodes. IC Role / Device Role / Timing Role: Low-noise, rail-to-rail input buffer and dc gain stage before SAR ADC sampling. Use Value: 10 GΩ input resistance preserves sensor signal integrity; 22 μA supply current extends node lifetime beyond 5 years. |
| Buffering for Multipole Filters | Level Shifting in Mixed-Voltage Systems |
Use Scenario: Driving high-Q active filters in portable medical devices requiring stable phase response and minimal distortion. IC Role / Device Role / Timing Role: Unity-gain stable buffer isolating filter sections and maintaining pole accuracy. Use Value: 60° phase margin and 230 kHz GBP ensure monotonic step response without peaking or ringing. | Use Scenario: Translating 0–2.5 V sensor outputs to 0–5 V or 0–10 V ranges for PLC analog inputs. IC Role / Device Role / Timing Role: Rail-to-rail output stage driving resistive loads up to 100 kΩ without clipping. Use Value: VOH ≥ 17.97 V at 18 V supply guarantees full-scale headroom; VOL ≤ 30 mV ensures clean low-end resolution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8605ACBZ-R7 | Single-channel, 1 pA IB max, 65 μA ISY, 10 MHz GBP - higher speed but 3× supply current. | Better for high-bandwidth sensor interfaces; unsuitable for ultra-low-power battery nodes. | Select when bandwidth >1 MHz is required and supply current <22 μA is not mandatory. |
| ADA4051-2ARMZ | Dual-channel, 0.5 pA IB max, 20 μA ISY, 150 kHz GBP - lower IB but reduced bandwidth vs. AD8657ACPZ-R7. | Preferred for ultra-high-impedance sources (e.g., glass pH electrodes); less ideal for fast-settling filters. | Select when input bias current <1 pA is critical and 230 kHz GBP is sufficient. |
Compared with AD8657ACPZ-R7, AD8605ACBZ-R7 trades micropower for bandwidth, while ADA4051-2ARMZ prioritizes sub-picoampere bias current over gain-bandwidth - making AD8657ACPZ-R7 the optimal balance of ultra-low power, precision, and rail-to-rail flexibility in industrial sensing.
Availability
AD8657ACPZ-R7 is available at Aetrix Electronics and suitable for current monitoring in process control, remote wireless sensor front ends, multipole filter buffering, and level shifting in mixed-voltage industrial systems requiring stable component supply and long-term lifecycle support.
Supply support for AD8657ACPZ-R7 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 micropower, precision signal conditioning in harsh industrial environments - targeting applications demanding extended temperature operation, rail-to-rail performance, and exceptional EMI immunity.
FAQ
What is the maximum supply voltage rating for AD8657ACPZ-R7?
The AD8657ACPZ-R7 has an absolute maximum supply voltage rating of 20.5 V, as specified in Table 5 of the Rev. C datasheet. Operation at 18 V is fully characterized and supported across all electrical parameters; sustained use above 18 V is not recommended and voids guaranteed performance.
Does AD8657ACPZ-R7 support true rail-to-rail input and output operation?
Yes, AD8657ACPZ-R7 supports rail-to-rail input (0 V to V+) and rail-to-rail output (within 30 mV of V− and within 30 mV of V+ at 18 V supply). Input common-mode range extends 300 mV beyond rails, and output swing remains linear down to 10 mV above V− and 30 mV below V+ under load.
What is the function of the exposed pad (EPAD) on the AD8657ACPZ-R7 LFCSP package?
The exposed pad on the AD8657ACPZ-R7 is designated EPAD and must be connected to V− or left unconnected per datasheet Figure 5 and Table 7. It is not electrically isolated and serves a thermal function only - improving θJA from 142°C/W (MSOP) to 75°C/W (LFCSP) when soldered to a V− copper plane.
Can AD8657ACPZ-R7 operate from a single 3.3 V supply?
Yes, AD8657ACPZ-R7 is fully specified for single-supply operation from 2.7 V to 18 V. At 3.3 V, it maintains rail-to-rail input/output swing, 22 μA max supply current, 350 μV max offset, and 190 kHz unity-gain crossover - making it suitable for portable instrumentation and low-voltage IoT edge nodes.
How does the DigiTrim® technology in AD8657ACPZ-R7 improve precision performance?
DigiTrim® is Analog Devices' proprietary digital trimming technique that adjusts internal resistor ratios during final test to reduce initial offset voltage to ≤350 μV without laser trimming. This enables high precision at low cost and improves long-term stability - offset drift remains ≤2 μV/°C across −40°C to +125°C.
AD8657ACPZ-R7 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:
- 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-LFCSP-WD (3x3)
AD8657ACPZ-R7 FAQ
1.How can I place an order for AD8657ACPZ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8657ACPZ-R7 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 AD8657ACPZ-R7 reliable?
The price and inventory of AD8657ACPZ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8657ACPZ-R7 is usually 5 days.
3.What payment methods are accepted for AD8657ACPZ-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8657ACPZ-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8657ACPZ-R7?
AD8657ACPZ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8657ACPZ-R7 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 AD8657ACPZ-R7?
For technical support, including AD8657ACPZ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8657ACPZ-R7 requirements.
6.How does Aetrix verify that AD8657ACPZ-R7 is sourced from the original manufacturer or authorized distributors?
All AD8657ACPZ-R7 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 AD8657ACPZ-R7 meets industry standards.
7.What is the process for return or replacement of AD8657ACPZ-R7?
All AD8657ACPZ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with AD8657ACPZ-R7, 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 AD8657ACPZ-R7 part is unused and in its original packaging.
Return procedure for AD8657ACPZ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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