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Analog Devices Inc. ADA4691-4ACPZ-R7
- Part No.:
- ADA4691-4ACPZ-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-WFQFN Exposed Pad, CSP
- Datasheet:
-
ADA4691-4ACPZ-R7.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 16LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:4,712
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Product details
Overview
ADA4691-4ACPZ-R7 from Analog Devices is a quad rail-to-rail output, low-power operational amplifier optimized for high-impedance sensor interfaces and portable instrumentation. It delivers 3.6 MHz gain bandwidth, 16 nV/√Hz voltage noise density at 1 kHz, 180 µA per amplifier supply current, and 0.5 pA typical input bias current - enabling precision amplification in photodiode, medical, and audio signal chains operating from 2.7 V to 5 V.
For engineers reviewing the ADA4691-4ACPZ-R7 datasheet, ADA4691-4ACPZ-R7 pinout, ADA4691-4ACPZ-R7 application, or ADA4691-4ACPZ-R7 equivalent, this page provides verified circuit role, package mapping (16-lead 3 mm × 3 mm LFCSP), shutdown control behavior, rail-to-rail output swing, and validated alternative options for low-noise, micropower op-amp selection.
Technical Context
The ADA4691-4ACPZ-R7 implements a CMOS input stage with dual independent shutdown pins - SD A/B controls Amplifiers A and B, SD C/D controls Amplifiers C and D - enabling selective power gating without affecting active channels. Its rail-to-rail output stage supports full-swing operation into 600 Ω loads while maintaining 0.003% THD + N at 1 kHz.
Designed for extended industrial temperature range (−40°C to +125°C), it features 4 µV/°C maximum offset voltage drift, 70–98 dB CMRR over frequency, and stable unity-gain operation with ≥49° phase margin into 35 pF capacitive loads - making it suitable for ADC drivers, active filters, and sample-and-hold circuits where DC accuracy and dynamic linearity are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 3.6 MHz - supports stable unity-gain operation and closed-loop bandwidth up to ~3.3 MHz with 1 MΩ load and 35 pF capacitance. |
| Supply Current per Amplifier | 180 µA typical at 5 V - enables four-channel amplification with total quiescent current under 0.72 mA, ideal for battery-powered systems. |
| Input Bias Current | 0.5 pA typical - preserves signal integrity in high-impedance photodiode and pyroelectric sensor front-ends without loading. |
| Voltage Noise Density | 16 nV/√Hz at 1 kHz - ensures low-noise amplification of microvolt-level sensor outputs without significant SNR degradation. |
| Offset Voltage Drift | 4 µV/°C maximum - maintains <±0.5 mV total drift across −40°C to +125°C, critical for uncalibrated industrial sensor nodes. |
| Rail-to-Rail Output Swing | Within 33 mV of rails (2 kΩ load, 5 V supply) - maximizes dynamic range in single-supply data acquisition systems. |
| Shutdown Current | 10 nA per shutdown group - reduces system standby power to nanoampere levels when amplifiers are inactive. |
Pinout & Package
The ADA4691-4ACPZ-R7 is housed in a 16-lead, 3 mm × 3 mm LFCSP (CP-16-22) with exposed thermal pad connected to V–. Pin 1 is marked by a dot; the exposed pad must be soldered to a PCB ground plane for optimal thermal performance and EMI immunity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (–IN A) | Inverting input of Amplifier A | High-impedance CMOS node; accepts signals from 0.3 V below V– to 0.3 V above V+. |
| 2 (+IN A) | Non-inverting input of Amplifier A | Differential pair input; matched to Pin 1 for low offset and drift. |
| 3 (V+) | Positive supply rail | Accepts 2.7 V to 5 V single supply or +1.35 V to +2.5 V in dual-supply mode. |
| 4 (OUT B) | Output of Amplifier B | Rail-to-rail capable; drives 600 Ω loads with <103 mV saturation voltage at 5 V. |
| 5 (–IN B) | Inverting input of Amplifier B | Independent high-Z input; electrically isolated from other amplifier inputs. |
| 6 (+IN B) | Non-inverting input of Amplifier B | Matched pair with Pin 5; supports differential sensing configurations. |
| 7 (SD A/B) | Shutdown control for Amps A & B | CMOS logic input; <0.8 V disables, >2.0 V enables (5 V supply); draws ≤1 µA. |
| 8 (OUT A) | Output of Amplifier A | Same drive strength and noise performance as Pin 4; shares no internal nodes with other outputs. |
| 9 (+IN C) | Non-inverting input of Amplifier C | Third amplifier input; identical electrical specs to Pins 2 and 6. |
| 10 (–IN C) | Inverting input of Amplifier C | Independent input channel; supports separate feedback networks per amplifier. |
| 11 (V–) | Negative supply rail / Ground reference | Connects to PCB ground plane; exposed pad must be tied to this pin for thermal and noise performance. |
| 12 (OUT C) | Output of Amplifier C | Full rail-to-rail swing; same settling time (1.5 µs to 0.1%) as other outputs. |
| 13 (–IN D) | Inverting input of Amplifier D | Fourth independent input; supports multi-channel sensor conditioning on one die. |
| 14 (+IN D) | Non-inverting input of Amplifier D | Matches all other +IN pins; enables consistent common-mode rejection across all four channels. |
| 15 (OUT D) | Output of Amplifier D | Final output channel; identical THD+N (0.003% at 1 kHz) and noise performance. |
| 16 (SD C/D) | Shutdown control for Amps C & D | Second independent shutdown domain; allows asymmetric power management (e.g., A+B active, C+D in standby). |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent shutdown control | Two logic-controlled domains (SD A/B and SD C/D) enable granular power management without cross-talk between amplifier pairs. |
| 0.5 pA typical input bias current | Minimizes voltage error in high-Z sensor interfaces (e.g., photodiodes, pH electrodes) without requiring guard traces or active guarding. |
| 16 nV/√Hz voltage noise density | Enables clean amplification of low-level signals (e.g., thermopile outputs) without dominating system noise floor. |
| Rail-to-rail output swing into 600 Ω | Delivers full-scale analog range to SAR ADCs and audio codecs without external level-shifting circuitry. |
| 4 µV/°C max offset drift | Reduces calibration frequency in field-deployed equipment operating across wide ambient temperatures. |
| 3.6 MHz GBP with 49° phase margin | Supports stable closed-loop gains ≥+10 with 35 pF capacitive loads - simplifying layout for ADC driver applications. |
Applications
| Photodiode Amplifier | Portable Medical Sensor |
|---|---|
Use Scenario: Amplifying nanoamp-level photocurrent from silicon PIN photodiodes in pulse oximetry or environmental light sensors. IC Role / Device Role / Timing Role: Transimpedance amplifier (TIA) with ultra-low input bias current and low voltage noise to preserve SNR. Use Value: 0.5 pA input bias avoids signal loss; 16 nV/√Hz noise ensures detection of weak optical pulses without oversampling. | Use Scenario: Conditioning low-amplitude bio-potential signals (e.g., ECG, EMG) in handheld diagnostic devices. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier input buffer with rail-to-rail output driving 16-bit SAR ADCs. Use Value: 3.6 MHz bandwidth captures fast transients; 4 µV/°C drift eliminates need for frequent auto-zero during clinical use. |
| Low-Side Current Sense | Audio Line Driver |
Use Scenario: Measuring motor or battery current via shunt resistor placed between load and ground. IC Role / Device Role / Timing Role: Precision difference amplifier referenced to ground, rejecting common-mode voltage up to 5 V. Use Value: 90–98 dB CMRR suppresses supply ripple; rail-to-rail output ensures full ADC utilization even at low sense voltages. | Use Scenario: Driving stereo headphone outputs or line-level signals in MP3 players and smart speakers. IC Role / Device Role / Timing Role: Low-distortion output buffer with 0.003% THD+N and 1.3 V/µs slew rate for clean audio reproduction. Use Value: 180 µA per channel enables 4-channel audio processing on coin-cell batteries for >100 hours. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise, micropower op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADA4692-4ARUZ | No shutdown functionality; identical 3.6 MHz GBW, 0.5 pA IB, and 16 nV/√Hz noise - but lacks SD pins. | Suitable only where continuous operation is required; cannot reduce system standby power. | Select ADA4692-4ARUZ if shutdown control is unnecessary and TSSOP-14 packaging is preferred for manual assembly. |
| AD8619ARUZ | Higher supply current (220 µA/channel), lower GBW (1.7 MHz), no rail-to-rail output - but offers better PSRR (105 dB). | Better suited for noisy supply environments; less suitable for battery life-critical or rail-swing-sensitive designs. | Select AD8619ARUZ when supply rejection dominates over power and output swing requirements in industrial control loops. |
Compared with ADA4692-4ARUZ and AD8619ARUZ, the ADA4691-4ACPZ-R7 uniquely combines dual shutdown domains, rail-to-rail output, and sub-200 µA quiescent current - making it the only option among the three that enables both ultra-low standby power and full dynamic range in space-constrained portable systems.
Availability
ADA4691-4ACPZ-R7 is available at Aetrix Electronics and suitable for photodiode amplifiers, portable medical sensors, and low-side current sense applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for ADA4691-4ACPZ-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 ADA4691-4ACPZ-R7 belongs to the ADA4691/ADA4692 family of micropower, low-noise, rail-to-rail op-amps engineered specifically for high-impedance sensor interfaces and portable instrumentation where precision, power efficiency, and thermal stability are non-negotiable.
FAQ
What is the operating temperature range for the ADA4691-4ACPZ-R7?
The ADA4691-4ACPZ-R7 is fully specified over the extended industrial temperature range of −40°C to +125°C. All key parameters - including input offset voltage drift (≤4 µV/°C), supply current (275 µA max per amplifier), and output voltage swing - are guaranteed across this range, making ADA4691-4ACPZ-R7 suitable for under-hood automotive sensors and industrial field instruments.
Does the ADA4691-4ACPZ-R7 support single-supply operation?
Yes, the ADA4691-4ACPZ-R7 supports true single-supply operation from 2.7 V to 5 V. Its input common-mode range extends from 0.3 V below V– to 0.3 V above V+, and its rail-to-rail output swings within 33 mV of each rail into 2 kΩ loads - enabling direct interfacing with 3.3 V or 5 V microcontrollers and ADCs without level-shifting circuitry.
How does the shutdown feature work on the ADA4691-4ACPZ-R7?
The ADA4691-4ACPZ-R7 has two independent CMOS-compatible shutdown pins: SD A/B disables Amplifiers A and B, while SD C/D disables Amplifiers C and D. A logic low (<0.8 V at 5 V supply) places the associated pair in shutdown, reducing supply current to 10 nA per group. Fast edge rates (<10 µs rise/fall) are required to avoid transient current spikes during transition.
What is the maximum capacitive load the ADA4691-4ACPZ-R7 can drive stably?
The ADA4691-4ACPZ-R7 maintains ≥49° phase margin and stable unity-gain operation with up to 35 pF capacitive load, as verified in the datasheet's typical performance characteristics. For loads exceeding 35 pF, external isolation resistance (e.g., 10–50 Ω in series with the output) is recommended to prevent peaking or oscillation - especially in ADC driver or cable-driving configurations.
Is the ADA4691-4ACPZ-R7 pin-compatible with other members of the ADA4691/ADA4692 family?
No - the ADA4691-4ACPZ-R7 uses a 16-lead LFCSP (CP-16-22) package, while the pin-compatible ADA4692-4 uses a 14-lead TSSOP (RU-14) and lacks shutdown pins. The ADA4691-2 (10-lead LFCSP) and ADA4692-2 (8-lead SOIC/LFCSP) are dual-channel variants with different pin counts and layouts. No drop-in replacement exists within the family; board redesign is required when switching variants.
ADA4691-4ACPZ-R7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad, CSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 1.3V/µs
- Gain Bandwidth Product:
- 3.6 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.5 pA
- Voltage - Input Offset:
- 500 µV
- Current - Supply:
- 180µA (x4 Channels)
- Current - Output / Channel:
- 55 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-LFCSP (3x3)
ADA4691-4ACPZ-R7 FAQ
1.How can I place an order for ADA4691-4ACPZ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADA4691-4ACPZ-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 ADA4691-4ACPZ-R7 reliable?
The price and inventory of ADA4691-4ACPZ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADA4691-4ACPZ-R7 is usually 5 days.
3.What payment methods are accepted for ADA4691-4ACPZ-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADA4691-4ACPZ-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADA4691-4ACPZ-R7?
ADA4691-4ACPZ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADA4691-4ACPZ-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 ADA4691-4ACPZ-R7?
For technical support, including ADA4691-4ACPZ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADA4691-4ACPZ-R7 requirements.
6.How does Aetrix verify that ADA4691-4ACPZ-R7 is sourced from the original manufacturer or authorized distributors?
All ADA4691-4ACPZ-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 ADA4691-4ACPZ-R7 meets industry standards.
7.What is the process for return or replacement of ADA4691-4ACPZ-R7?
All ADA4691-4ACPZ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with ADA4691-4ACPZ-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 ADA4691-4ACPZ-R7 part is unused and in its original packaging.
Return procedure for ADA4691-4ACPZ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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