My Inquiry
My Account
Analog Devices Inc. ADA4691-4ACPZ-RL
- Part No.:
- ADA4691-4ACPZ-RL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-WFQFN Exposed Pad, CSP
- Datasheet:
-
ADA4691-4ACPZ-RL.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 16LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:15,902
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ADA4691-4ACPZ-RL from Analog Devices is a quad rail-to-rail output operational amplifier optimized for low-power, low-noise sensor and portable audio signal conditioning. It delivers 3.6 MHz gain bandwidth, 16 nV/√Hz voltage noise density at 1 kHz, 180 µA per amplifier supply current, 0.5 pA typical input bias current, and operates from 2.7 V to 5 V single supply. It is used in photodiode amplifiers and low-side current sense circuits requiring high impedance, precision, and battery efficiency.
For engineers reviewing the ADA4691-4ACPZ-RL datasheet, ADA4691-4ACPZ-RL pinout, ADA4691-4ACPZ-RL application, or ADA4691-4ACPZ-RL equivalent, key selection criteria 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 verified rail-to-rail output swing with <40 mV VOL (2 kΩ load) at 2.7 V.
Technical Context
The ADA4691-4ACPZ-RL implements a CMOS input stage with ultra-low input bias current and a fully differential output stage enabling true rail-to-rail operation. Its internal shutdown logic uses CMOS inverters per pair of amplifiers, with VIH = 1.6 V (2.7 V supply) and VIL = 0.5 V, allowing direct interface to 1.8 V logic without level shifting.
It features a stable unity-gain compensated design (ΦM = 49° at AV = +1, CL = 35 pF), supports capacitive loads up to 200 pF with controlled overshoot, and maintains 63 dB large-signal voltage gain across −40°C to +125°C at 2 kΩ load - critical for precision instrumentation front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 3.6 MHz - enables stable closed-loop operation up to ~300 kHz at AV = 12, suitable for anti-aliasing filters and ADC drivers. |
| Supply Current per Amplifier | 180 µA typical at 2.7 V - allows four-channel operation under 1 mA total, ideal for battery-powered medical sensors. |
| Input Bias Current | 0.5 pA typical - preserves signal integrity in high-impedance photodiode and pyroelectric sensor interfaces. |
| Voltage Noise Density | 16 nV/√Hz at 1 kHz - ensures <0.003% THD+N in audio-band applications like smartphone line drivers. |
| Offset Voltage Drift | 4 µV/°C max - limits drift-induced error to <0.4 mV over 100°C range, critical for uncalibrated industrial transducers. |
| Rail-to-Rail Output Swing | VOL = 33 mV, VOH = 2.67 V (2.7 V supply, 2 kΩ load) - delivers >98% of full-scale dynamic range for 12-bit+ data acquisition. |
| Shutdown Current | 10 nA per shutdown state - reduces quiescent power by >99.99% when amplifiers are inactive, extending standby time. |
Pinout & Package
The ADA4691-4ACPZ-RL 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 ball A1 identifier; exposed pad must be soldered to 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 node; accepts signals down to V– – 0.3 V; clamped to rails via internal diodes. |
| 2 (+IN A) | Non-inverting input of Amplifier A | Differential pair input; matched to Pin 1 for common-mode rejection >70 dB. |
| 3 (V+) | Positive supply rail | Accepts 2.7 V to 5 V single supply or +2.5 V in split-supply mode; decoupling required within 2 mm. |
| 4 (OUT B) | Output of Amplifier B | Rail-to-rail capable; drives 2 kΩ load to within 33 mV of V– and 33 mV of V+ at 2.7 V. |
| 5 (SD A/B) | Shutdown control for Amps A & B | CMOS-compatible input; <0.5 V disables both amps, >1.6 V enables; draws <1 µA leakage. |
| 6 (–IN B) | Inverting input of Amplifier B | Electrically isolated from other inputs; shares same IB and VOS distribution as Pin 1. |
| 7 (+IN B) | Non-inverting input of Amplifier B | Matched to Pin 6; supports differential input configurations with common-mode range to V+ – 0.3 V. |
| 8 (V–) | Negative supply rail / Ground reference | Return path for all supplies and shutdown logic; exposed pad must connect here for thermal compliance. |
| 9 (+IN C) | Non-inverting input of Amplifier C | Independent channel; identical AC/DC specs to Pins 2 and 7; no crosstalk coupling above –130 dB @ 10 kHz. |
| 10 (–IN C) | Inverting input of Amplifier C | Same input capacitance (2.5 pF diff, 7 pF common-mode) as all channels; supports charge amplifier topologies. |
| 11 (V+) | Positive supply rail (redundant) | Second V+ connection for improved PSRR; must be tied to same net as Pin 3 with low-inductance trace. |
| 12 (OUT D) | Output of Amplifier D | Full rail-to-rail swing; specified short-circuit current ±15 mA; safe for 600 Ω headphone loads. |
| 13 (–IN D) | Inverting input of Amplifier D | Valid for input voltages from V– – 0.3 V to V+ – 0.3 V; supports single-supply transimpedance designs. |
| 14 (+IN D) | Non-inverting input of Amplifier D | Matches Pin 9; enables 4-channel synchronous sampling in multi-sensor systems. |
| 15 (OUT A) | Output of Amplifier A | First output; tested for settling time ≤1 µs to 0.1% with 0.5 V step into 2 kΩ. |
| 16 (OUT C) | Output of Amplifier C | Identical drive strength to Pin 15; channel separation >−130 dB at 100 kHz ensures minimal inter-channel interference. |
Key Features
| Feature | Design Value |
|---|---|
| Quad architecture with dual shutdown pairs | SD A/B controls Amps A+B; SD C/D controls Amps C+D - enables independent power gating for multi-stage signal chains. |
| Ultra-low input bias current (0.5 pA typ) | Enables >10 GΩ source impedance interfacing without significant DC error or time constant degradation. |
| Low 1/f noise (3.1 µV p-p, 0.1–10 Hz) | Minimizes baseline wander in ECG and EEG front-ends where sub-Hz signal fidelity is essential. |
| Specified performance over −40°C to +125°C | Guarantees VOS drift ≤4 µV/°C and ISY ≤240 µA/channel across full industrial range - no derating needed. |
| 16-lead LFCSP with thermal pad | θJA = 75°C/W enables 4-channel operation at 125°C ambient without forced air or heatsinking. |
Applications
| Photodiode Amplification | Portable Medical Sensor Front-End |
|---|---|
Use Scenario: Converting weak photocurrent (pA–nA) from silicon photodiodes in pulse oximeters or environmental light sensors. IC Role / Device Role / Timing Role: Transimpedance amplifier with selectable gain; provides low-noise, high-impedance virtual ground and rail-to-rail output for ADC input. Use Value: 0.5 pA IB prevents signal loss at high feedback resistances (>100 MΩ); 16 nV/√Hz noise ensures SNR >80 dB for 100 kHz bandwidth. | Use Scenario: Signal conditioning for thermistor, RTD, or piezoelectric transducers in handheld diagnostic devices. IC Role / Device Role / Timing Role: Precision buffer and gain stage preceding SAR ADC; handles wide common-mode range and rejects supply ripple. Use Value: 70 dB CMRR and 80 dB PSRR suppress motion artifact and battery ripple; 4 µV/°C drift avoids recalibration during field use. |
| Low-Side Current Sensing | Audio Line Driver (Smartphone) |
Use Scenario: Measuring motor or LED load current by amplifying mV-level shunt voltage in battery management ICs. IC Role / Device Role / Timing Role: Differential amplifier referenced to ground; rejects common-mode offset while preserving small differential signal. Use Value: Input voltage range extends to V– – 0.3 V, enabling accurate sensing near ground; 180 µA/channel minimizes self-heating error. | Use Scenario: Driving stereo line outputs (2 VRMS, 10 kΩ load) in MP3 players and smartphones with minimal distortion. IC Role / Device Role / Timing Role: Unity-gain buffer with low THD+N (0.001% at 1 kHz) and fast settling (1.5 µs to 0.1%) for transient-rich audio. Use Value: 0.003% THD+N at 1 kHz and rail-to-rail swing deliver full dynamic range without clipping on 2.7 V supply. |
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 pins; 14-lead TSSOP package; higher ISY (225 µA typ at 5 V); same GBW, noise, and VOS specs. | Lacks power-gating capability; unsuitable for duty-cycled sensor nodes but preferred for space-constrained PCBs with no need for shutdown. | Select ADA4692-4ARUZ only if shutdown functionality is unnecessary and TSSOP footprint is acceptable. |
| AD8694ARUZ | Higher supply current (525 µA/ch); no shutdown; 10 MHz GBW; 12 nV/√Hz noise; 8-lead SOIC or 14-lead TSSOP. | Better bandwidth and lower noise, but consumes >2× power; not rated for >105°C; lacks rail-to-rail output swing margin at low supply. | Choose AD8694ARUZ only when >3.6 MHz bandwidth is mandatory and thermal/power constraints allow. |
Compared with ADA4692-4ARUZ and AD8694ARUZ, the ADA4691-4ACPZ-RL uniquely combines quad-channel operation, dual-pair shutdown, 3.6 MHz bandwidth, and 0.5 pA input bias in a thermally efficient 3 mm × 3 mm LFCSP - making it the sole option for compact, battery-operated, multi-sensor systems requiring active power management.
Availability
ADA4691-4ACPZ-RL is available at Aetrix Electronics and suitable for photodiode amplification, portable medical sensor front-ends, and low-side current sensing requiring stable component supply across automotive, industrial, and consumer electronics programs.
Supply support for ADA4691-4ACPZ-RL 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 family was designed specifically for ultra-low-power, precision signal conditioning in portable and battery-operated instrumentation - emphasizing rail-to-rail output, femtoampere input bias, and extended temperature reliability.
FAQ
What is the maximum operating supply voltage for ADA4691-4ACPZ-RL?
The ADA4691-4ACPZ-RL has an absolute maximum supply voltage of 6 V, but its recommended operating range is 2.7 V to 5 V single supply (or ±1.35 V to ±2.5 V dual supply). Operation beyond 5 V risks exceeding internal junction temperature limits and invalidates parametric guarantees per the datasheet's Absolute Maximum Ratings table.
Does ADA4691-4ACPZ-RL support true rail-to-rail input common-mode range?
No, the ADA4691-4ACPZ-RL supports rail-to-rail *output* swing but not rail-to-rail *input*. Its input common-mode voltage range is specified as V– – 0.3 V to V+ – 0.3 V (e.g., −0.3 V to +2.4 V at 2.7 V supply), meaning it cannot accept signals at the negative rail without external level-shifting circuitry.
How does the dual shutdown architecture of ADA4691-4ACPZ-RL work?
The ADA4691-4ACPZ-RL has two independent shutdown pins: SD A/B controls amplifiers A and B, while SD C/D controls amplifiers C and D. Each pin accepts CMOS logic levels (VIH ≥ 1.6 V, VIL ≤ 0.5 V at 2.7 V supply) and reduces supply current per pair to 10 nA when asserted - enabling selective channel power-down without affecting other amplifier sections.
Can ADA4691-4ACPZ-RL drive a 600 Ω load effectively?
Yes, the ADA4691-4ACPZ-RL is characterized driving 600 Ω loads: at 2.7 V supply, VOH = 2.55 V and VOL = 78 mV (typ), delivering >90% of full-scale swing. Its ±15 mA short-circuit current and 372 Ω closed-loop output impedance at 1 MHz ensure stability and fidelity in headphone and line-driver applications.
What is the thermal resistance (θJA) of the ADA4691-4ACPZ-RL package?
The ADA4691-4ACPZ-RL in its 16-lead LFCSP (CP-16-22) package has a thermal resistance θJA of 75°C/W when mounted on a standard 4-layer JEDEC board. This value assumes proper soldering of the exposed thermal pad to a solid copper plane - failure to do so increases junction temperature by >25°C under full 4-channel load.
ADA4691-4ACPZ-RL 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-RL FAQ
1.How can I place an order for ADA4691-4ACPZ-RL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADA4691-4ACPZ-RL 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-RL reliable?
The price and inventory of ADA4691-4ACPZ-RL 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-RL is usually 5 days.
3.What payment methods are accepted for ADA4691-4ACPZ-RL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADA4691-4ACPZ-RL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADA4691-4ACPZ-RL?
ADA4691-4ACPZ-RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADA4691-4ACPZ-RL 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-RL?
For technical support, including ADA4691-4ACPZ-RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADA4691-4ACPZ-RL requirements.
6.How does Aetrix verify that ADA4691-4ACPZ-RL is sourced from the original manufacturer or authorized distributors?
All ADA4691-4ACPZ-RL 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-RL meets industry standards.
7.What is the process for return or replacement of ADA4691-4ACPZ-RL?
All ADA4691-4ACPZ-RL units undergo pre-shipment inspection (PSI). If there is an issue with ADA4691-4ACPZ-RL, 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-RL part is unused and in its original packaging.
Return procedure for ADA4691-4ACPZ-RL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADA4691-4ACPZ-RL Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
