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Analog Devices Inc. ADA4691-4ACPZ-R2
- Part No.:
- ADA4691-4ACPZ-R2
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-WFQFN Exposed Pad, CSP
- Datasheet:
-
ADA4691-4ACPZ-R2.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 16LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:4,289
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Product details
Overview
ADA4691-4ACPZ-R2 from Analog Devices is a quad rail-to-rail output operational amplifier optimized for low-power, low-noise precision signal conditioning in battery-powered and space-constrained systems. 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 high-impedance sensor interfacing and photodiode amplification with minimal power overhead.
For engineers reviewing the ADA4691-4ACPZ-R2 datasheet, ADA4691-4ACPZ-R2 pinout, ADA4691-4ACPZ-R2 application, or ADA4691-4ACPZ-R2 equivalent, key selection considerations include its dual shutdown control architecture (SD A/B and SD C/D), 16-lead 3 mm × 3 mm LFCSP package, −40°C to +125°C extended industrial temperature rating, and rail-to-rail output swing supporting single-supply operation down to 2.7 V.
Technical Context
The ADA4691-4ACPZ-R2 implements a CMOS-input, rail-to-rail output op amp topology with independent dual shutdown pairs: SD A/B controls Amplifiers A and B; SD C/D controls Amplifiers C and D. Each shutdown pin accepts standard logic-level inputs (VIH = 1.6 V min at 2.7 V supply; 2.0 V min at 5 V) and reduces quiescent current to 10 nA per amplifier when asserted.
Its 3.6 MHz GBP, 1.3 V/µs slew rate (at 5 V), and 49°–52° phase margin ensure stable unity-gain and closed-loop configurations into capacitive loads up to 200 pF. Input offset voltage is specified at 0.5–2.5 mV (typ), with drift ≤4 µV/°C max across −40°C to +125°C - critical for unattended portable instrumentation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 3.6 MHz - supports stable unity-gain buffers and active filters up to audio band without external compensation. |
| Supply Current per Amplifier | 180 μA typical at 5 V - enables four-channel amplification on <1 mA total, ideal for multi-sensor nodes. |
| Input Bias Current | 0.5 pA typical - preserves signal integrity in >1 GΩ source impedances (e.g., pyroelectric sensors, photodiodes). |
| Voltage Noise Density | 16 nV/√Hz at 1 kHz - ensures <0.003% THD+N in audio drivers and precision ADC front-ends. |
| Offset Voltage Drift | ≤4 µV/°C maximum - maintains calibration stability over full industrial temperature range without recalibration. |
| 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 amplifier - reduces system standby power by >99.99% when channels are idle. |
Pinout & Package
The ADA4691-4ACPZ-R2 is housed in a 16-lead, 3 mm × 3 mm LFCSP (CP-16-22) with exposed thermal pad. The package requires connection of the exposed pad to V− for optimal thermal performance and EMI suppression.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 16 | −IN A / −IN D | Inverting inputs for Amplifier A and D - high-impedance CMOS nodes requiring guarded layout. |
| 2, 15 | +IN A / +IN D | Non-inverting inputs for Amplifier A and D - matched to −IN pins for common-mode rejection. |
| 3, 14 | OUT A / OUT D | Rail-to-rail output drivers - capable of sourcing/sinking ±15 mA (2.7 V) or ±55 mA (5 V). |
| 4, 13 | V− / V− | Negative supply rail - shared return for all amplifiers and shutdown logic. |
| 5, 12 | +IN B / +IN C | Non-inverting inputs for Amplifier B and C - electrically isolated but thermally coupled within die. |
| 6, 11 | −IN B / −IN C | Inverting inputs for Amplifier B and C - identical bias and noise characteristics to A/D pair. |
| 7, 10 | OUT B / OUT C | Rail-to-rail output drivers - independently buffered; channel separation >120 dB at 1 kHz. |
| 8 | V+ | Positive supply rail - accepts 2.7 V to 5 V single supply or ±1.35 V to ±2.5 V dual supply. |
| 9 | SD A/B | Shutdown control for Amplifiers A and B - logic high enables; logic low disables both with <1 µs turn-off time. |
| 12 | SD C/D | Shutdown control for Amplifiers C and D - independent of SD A/B; enables selective channel power gating. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent shutdown control | Reduces system-level power by selectively disabling two amplifier pairs - essential for duty-cycled sensor arrays. |
| 0.5 pA input bias current (typ) | Enables direct coupling to ultra-high-impedance sources (e.g., pH electrodes, piezoelectric transducers) without guard rings. |
| 3.6 MHz bandwidth with 49°–52° phase margin | Supports stable closed-loop gains ≥10 without external compensation, simplifying filter design. |
| Rail-to-rail output with 33 mV headroom (2 kΩ, 5 V) | Maximizes usable signal swing in single-supply 3.3 V or 5 V systems - improves SNR in ADC driver stages. |
| −40°C to +125°C operating range | Qualified for automotive cabin modules, industrial motor controllers, and outdoor IoT edge nodes without derating. |
Applications
| Photodiode Amplification | Portable Medical Instrumentation |
|---|---|
Use Scenario: Converting weak photocurrents (pA–nA) from medical pulse oximeter LEDs into measurable voltage signals. IC Role / Device Role / Timing Role: Transimpedance amplifier with ultra-low input bias and low noise to preserve signal fidelity at sub-100 nA levels. Use Value: Enables detection of <100 pA photocurrents with <1 µV RMS noise floor - critical for accurate SpO₂ calculation. | Use Scenario: Signal conditioning for ECG/EEG electrode interfaces in handheld diagnostic devices. IC Role / Device Role / Timing Role: Low-noise, low-drift buffer and gain stage preceding 16-bit SAR ADCs. Use Value: Maintains <1 µV offset drift over body-temperature range (32–42°C), eliminating baseline wander artifacts. |
| Low-Side Current Sensing | ADC Driver for Precision Data Acquisition |
Use Scenario: Measuring motor phase current in battery-powered BLDC drives via shunt resistor. IC Role / Device Role / Timing Role: High-common-mode-rejection difference amplifier with rail-to-rail output driving microcontroller ADC. Use Value: Achieves 70 dB CMRR at 100 kHz while operating from same 3.3 V rail as MCU - eliminates level-shifting components. | Use Scenario: Driving 16-bit successive-approximation ADC inputs in portable multimeters and data loggers. IC Role / Device Role / Timing Role: Unity-gain stable buffer with 16 nV/√Hz noise and 3.6 MHz bandwidth to settle before ADC sampling. Use Value: Ensures <0.5 LSB error at 100 kSPS with 100 nF input capacitance - meets ENOB >15.5 bits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADA4692-4ARUZ | No shutdown functionality; 14-lead TSSOP package; slightly higher ISY (225 μA typ at 5 V). | Suitable where always-on operation is acceptable and PCB real estate allows larger TSSOP footprint. | Select ADA4692-4ARUZ if shutdown is unnecessary and cost-sensitive volume production favors leaded packages. |
| AD8694ARUZ | Higher supply current (520 μA typ); no shutdown; 14-lead TSSOP; wider offset spec (1.5 mV max). | Better suited for general-purpose buffering where ultra-low power is not required. | Choose AD8694ARUZ only when legacy TSSOP compatibility or higher drive strength (>60 mA) outweighs power and noise requirements. |
Compared with ADA4692-4ARUZ and AD8694ARUZ, the ADA4691-4ACPZ-R2 uniquely combines quad-channel operation, dual-pair shutdown control, 3 mm × 3 mm LFCSP packaging, and sub-200 μA per amplifier consumption - making it the only option for compact, battery-operated systems requiring dynamic channel power management.
Availability
ADA4691-4ACPZ-R2 is available at Aetrix Electronics and suitable for portable medical instrumentation, photodiode-based optical sensing, and low-side current monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADA4691-4ACPZ-R2 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/ADA4692 family was designed specifically for precision, low-power signal conditioning in portable and space-constrained industrial and medical systems - emphasizing ultra-low input bias, rail-to-rail output, and extended temperature reliability.
FAQ
What is the maximum supply voltage for the ADA4691-4ACPZ-R2?
The ADA4691-4ACPZ-R2 has an absolute maximum supply voltage rating of 6 V. Operation is fully specified from 2.7 V to 5 V single supply or ±1.35 V to ±2.5 V dual supply. Exceeding 6 V risks permanent damage per the Absolute Maximum Ratings table in the Rev. E datasheet.
Does the ADA4691-4ACPZ-R2 support true rail-to-rail input?
No, the ADA4691-4ACPZ-R2 features rail-to-rail *output* only. Its input common-mode voltage range extends to −0.3 V below V− and +1.6 V above V− at 2.7 V supply (or +3.9 V above V− at 5 V), but does not include the positive rail. This is explicitly stated in Tables 2 and 3 under "Input Voltage Range".
How does shutdown operation affect output state in the ADA4691-4ACPZ-R2?
When either shutdown pin (SD A/B or SD C/D) is pulled low, the corresponding pair of amplifiers enters high-impedance output disable mode - the outputs float and are not clamped. The datasheet cautions that external pull-downs or termination may be required to prevent floating nodes in system-level designs using ADA4691-4ACPZ-R2.
What is the thermal resistance (θJA) of the ADA4691-4ACPZ-R2 package?
The ADA4691-4ACPZ-R2 in its 16-lead LFCSP (CP-16-22) package has a θJA of 75°C/W, as specified in Table 5 of the Rev. E datasheet. This value assumes mounting on a standard 4-layer JEDEC test board - actual board-level θJA will vary based on copper area, via count, and airflow.
Can the ADA4691-4ACPZ-R2 drive a 600 Ω load at 5 V supply?
Yes, the ADA4691-4ACPZ-R2 can drive a 600 Ω load at 5 V supply: VOH = 4.85 V (min), VOL = 100 mV (max) - delivering >4.75 V of swing. However, THD+N rises to 0.008% at 1 kHz, and output saturation voltage increases to 128 mV (max) at +125°C per Table 3, so thermal derating must be considered in high-temperature 600 Ω applications.
ADA4691-4ACPZ-R2 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-R2 FAQ
1.How can I place an order for ADA4691-4ACPZ-R2 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADA4691-4ACPZ-R2 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-R2 reliable?
The price and inventory of ADA4691-4ACPZ-R2 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-R2 is usually 5 days.
3.What payment methods are accepted for ADA4691-4ACPZ-R2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADA4691-4ACPZ-R2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADA4691-4ACPZ-R2?
ADA4691-4ACPZ-R2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADA4691-4ACPZ-R2 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-R2?
For technical support, including ADA4691-4ACPZ-R2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADA4691-4ACPZ-R2 requirements.
6.How does Aetrix verify that ADA4691-4ACPZ-R2 is sourced from the original manufacturer or authorized distributors?
All ADA4691-4ACPZ-R2 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-R2 meets industry standards.
7.What is the process for return or replacement of ADA4691-4ACPZ-R2?
All ADA4691-4ACPZ-R2 units undergo pre-shipment inspection (PSI). If there is an issue with ADA4691-4ACPZ-R2, 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-R2 part is unused and in its original packaging.
Return procedure for ADA4691-4ACPZ-R2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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