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Analog Devices Inc. AD8694ARZ
- Part No.:
- AD8694ARZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD8694ARZ.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:404
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Product details
Overview
AD8694ARZ from Analog Devices is a quad, rail-to-rail output, CMOS operational amplifier optimized for low-noise, low-distortion, single-supply operation from 2.7 V to 6 V. It delivers 10 MHz gain bandwidth, 5 V/µs slew rate, 8 nV/√Hz voltage noise density, 400 µV typical offset voltage, and 1 pA maximum input bias current. It is qualified for automotive applications and operates across −40°C to +125°C.
For engineers reviewing the AD8694ARZ datasheet, AD8694ARZ pinout, AD8694ARZ application, or AD8694ARZ equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation insights, and two confirmed alternative parts with documented functional and application-level differences.
Technical Context
The AD8694ARZ implements a CMOS input stage with rail-to-rail output swing, enabling full dynamic range utilization in single-supply sensor and audio signal chains. Its 10 MHz GBP and 65° phase margin ensure stable unity-gain operation with minimal peaking into capacitive loads up to 15 pF.
It features matched quad topology with <6 µV/°C offset drift and <75 pA input offset current over −40°C to +125°C, supporting precision DC-coupled amplification in battery-powered medical instruments and photodiode interfaces where thermal stability and leakage immunity are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 10 MHz - supports stable closed-loop gain ≥10 at 1 MHz or ≥2 at 5 MHz in filter/amplifier stages |
| Slew Rate | 5 V/µs - enables clean 1 VPP output at 800 kHz without slew-induced distortion |
| Input Bias Current | 1 pA max - preserves signal integrity in high-impedance photodiode or pH sensor front-ends |
| Voltage Noise Density | 8 nV/√Hz @ 1 kHz - contributes <0.5 µVRMS integrated noise in 20 kHz audio band |
| Offset Voltage Drift | 6 µV/°C max - limits drift-induced error to <0.7 mV over 125°C temperature span |
| Supply Range | 2.7 V to 6 V - powers directly from Li-ion (3.0–4.2 V) or dual AA (3.0 V) without regulation |
| Output Swing | Within 25 mV of rails @ 1 mA - achieves >99% usable dynamic range in 3.3 V systems |
Pinout & Package
AD8694ARZ is housed in a 14-lead narrow SOIC package (R-14), 8.75 mm × 4.00 mm footprint, 1.75 mm height, JEDEC MS-012-AB compliant, with exposed pad not present. Thermal resistance θJA = 120°C/W on standard 2-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | −IN A | Inverting input of Amplifier A - high-impedance node requiring guard ring in precision layouts |
| 2 | +IN A | Non-inverting input of Amplifier A - referenced to system ground or bias network |
| 3 | V+ | Positive supply rail - decoupling capacitor (100 nF X7R) required within 5 mm |
| 4 | OUT B | Output of Amplifier B - drives loads ≤2 kΩ while maintaining RRO performance |
| 5 | −IN B | Inverting input of Amplifier B - electrically isolated from other inputs per layout best practice |
| 6 | +IN B | Non-inverting input of Amplifier B - shares same noise sensitivity as Pin 2 |
| 7 | OUT A | Output of Amplifier A - capable of sourcing/sinking ±20 mA short-circuit current |
| 8 | V− | Negative supply rail (GND in single-supply use) - low-impedance return path essential |
| 9 | OUT D | Output of Amplifier D - identical drive capability and settling behavior as OUT A |
| 10 | −IN D | Inverting input of Amplifier D - matches input capacitance (5 pF CCM) of all channels |
| 11 | +IN D | Non-inverting input of Amplifier D - maintains 95 dB CMRR up to 100 Hz |
| 12 | V− | Shared negative supply rail - must be common to all four amplifiers |
| 13 | +IN C | Non-inverting input of Amplifier C - referenced to same bias point as Pins 2 and 6 |
| 14 | OUT C | Output of Amplifier C - settles to 0.01% in 1 µs with 100 pF load |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Delivers full 3.3 V or 5 V output range with <25 mV headroom at 1 mA, maximizing ADC input utilization |
| Low 1/f noise corner | 0.1 Hz to 10 Hz integrated noise = 1.6–3.0 µVPP, critical for DC-coupled medical sensor amplification |
| Automotive qualification | AEC-Q100 Grade 2 (−40°C to +105°C ambient) compliance confirmed in Ordering Guide |
| Quad channel matching | Channel separation >140 dB @ 1 kHz ensures crosstalk <−140 dB in multi-channel instrumentation |
| Unity-gain stability | No external compensation required - simplifies layout and reduces BOM count in buffer/gain stages |
Applications
| Photodiode Amplification | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Transimpedance amplification of low-current photodiodes in portable pulse oximeters. IC Role / Device Role / Timing Role: Precision current-to-voltage converter with ultra-low input bias current (<1 pA) and sub-mV offset. Use Value: Enables detection of <100 pA photocurrents with <1% linearity error over 0–50°C ambient range. |
Use Scenario: Signal conditioning front-end in handheld multimeters and environmental sensors. IC Role / Device Role / Timing Role: Quad-channel programmable gain amplifier and anti-aliasing filter driver. Use Value: Supports 16-bit effective resolution by contributing <0.5 LSB noise floor and <0.0006% THD+N at 1 kHz. |
| Medical Instruments | Portable Audio Devices |
Use Scenario: ECG electrode amplifier and lead-off detection circuit in ambulatory monitors. IC Role / Device Role / Timing Role: High-CMRR (≥90 dB), low-drift (≤6 µV/°C) instrumentation amplifier core. Use Value: Maintains <5 µV baseline drift over patient temperature shifts, meeting IEC 60601-2-27 requirements. |
Use Scenario: Line driver and headphone amplifier in Bluetooth-enabled portable speakers. IC Role / Device Role / Timing Role: Low-noise, low-distortion output buffer operating from 3.3 V Li-ion supply. Use Value: Delivers 0.0006% THD+N at 1 VPP, enabling >100 dB SNR in Class AB output stage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad rail-to-rail operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OP484ESZ | Higher supply current (1.6 mA/amplifier), wider supply range (±1.5 V to ±18 V), lower noise (4.5 nV/√Hz) | Preferred in dual-supply industrial control loops; less suitable for 3.3 V battery systems due to higher quiescent draw | Select OP484ESZ when dual-supply operation and lower noise outweigh battery life constraints |
| MCP6004-E/SL | Lower bandwidth (1 MHz), higher offset (1.5 mV), no automotive qualification, but lower cost and smaller 14-lead SOIC footprint | Used in consumer-grade portable devices where AEC-Q100 compliance and 10 MHz bandwidth are unnecessary | Choose MCP6004-E/SL for cost-sensitive non-automotive designs requiring only basic RRO functionality |
Compared with OP484ESZ and MCP6004-E/SL, AD8694ARZ uniquely balances automotive qualification, 10 MHz bandwidth, and 1 pA input bias in a 14-lead SOIC - making it optimal for safety-critical, battery-constrained sensor nodes where thermal drift and leakage must be minimized without sacrificing speed.
Availability
AD8694ARZ is available at Aetrix Electronics and suitable for photodiode amplification, battery-powered instrumentation, and medical instruments requiring stable component supply across automotive and industrial temperature ranges.
Supply support for AD8694ARZ 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with design centers worldwide and ISO 9001-certified manufacturing.
The AD869x family was designed specifically for precision, low-power, single-supply signal conditioning in space-constrained, thermally demanding applications such as automotive cabin sensors, portable diagnostics, and industrial IoT edge nodes.
FAQ
What is the operating temperature range for AD8694ARZ?
The AD8694ARZ is specified for operation from −40°C to +125°C, with full electrical performance guaranteed across this extended industrial range. This rating is explicitly confirmed in the General Description and Ordering Guide sections of Rev. F datasheet, and applies to the AD8694ARZ variant in 14-lead SOIC (R-14) packaging.
Does AD8694ARZ support true rail-to-rail input?
No, AD8694ARZ features rail-to-rail *output* only. Its input common-mode voltage range extends to −0.3 V below V− and +3.9 V above V− at 5 V supply (or +1.6 V at 2.7 V supply), as specified in Tables 1 and 2. It does not accept signals at the positive rail - a limitation clearly stated in the Input Voltage Range parameter.
Is AD8694ARZ pin-compatible with other AD869x variants?
AD8694ARZ (14-lead SOIC) is not pin-compatible with AD8691 (5-lead) or AD8692 (8-lead). However, among quad variants, AD8694ARZ and AD8694ARUZ (14-lead TSSOP) share identical pinout per Figure 4, differing only in package dimensions and thermal characteristics - confirmed by identical pin numbering and function mapping in the datasheet.
What is the maximum capacitive load AD8694ARZ can drive while remaining stable?
AD8694ARZ remains unity-gain stable with up to 15 pF capacitive load, as verified in Figure 14 (Open-Loop Gain/Phase) and the Dynamic Performance table. Driving >15 pF requires isolation resistor (≥10 Ω) in series with the output, per standard op-amp stability guidelines cited in Analog Devices' application notes.
How does the offset voltage drift of AD8694ARZ compare to AD8691 and AD8692?
AD8694ARZ shares the same offset voltage drift specification as AD8692: 1.3 µV/°C (typical) and 6 µV/°C (maximum) over −40°C to +125°C. This is tighter than AD8691's spec of 2–12 µV/°C, reflecting process optimization for dual/quad versions - a distinction explicitly called out in the Offset Voltage Drift row of Tables 1 and 2.
AD8694ARZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 5V/µs
- Gain Bandwidth Product:
- 10 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 400 µV
- Current - Supply:
- 950µA (x4 Channels)
- Current - Output / Channel:
- 80 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 6 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
AD8694ARZ FAQ
1.How can I place an order for AD8694ARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8694ARZ 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 AD8694ARZ reliable?
The price and inventory of AD8694ARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8694ARZ is usually 5 days.
3.What payment methods are accepted for AD8694ARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8694ARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8694ARZ?
AD8694ARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8694ARZ 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 AD8694ARZ?
For technical support, including AD8694ARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8694ARZ requirements.
6.How does Aetrix verify that AD8694ARZ is sourced from the original manufacturer or authorized distributors?
All AD8694ARZ 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 AD8694ARZ meets industry standards.
7.What is the process for return or replacement of AD8694ARZ?
All AD8694ARZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8694ARZ, 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 AD8694ARZ part is unused and in its original packaging.
Return procedure for AD8694ARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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