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Analog Devices Inc. AD824ARZ-14
- Part No.:
- AD824ARZ-14
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD824ARZ-14.pdf
- Description:
- IC OPAMP JFET 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,527
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Product details
Overview
AD824ARZ-14 from Analog Devices is a quad, rail-to-rail output, FET-input operational amplifier optimized for single-supply operation from 3 V to 30 V. It delivers 2 MHz gain bandwidth, 2 V/µs slew rate, and ultra-low 2 pA input bias current-enabling high-accuracy amplification of high-impedance sensors in battery-powered medical instrumentation and photo diode preamplifiers.
For engineers reviewing the AD824ARZ-14 datasheet, AD824ARZ-14 pinout, AD824ARZ-14 application, or AD824ARZ-14 equivalent, key selection criteria include guaranteed rail-to-rail output swing (within 15 mV of rails), low 500 µA per-amplifier supply current, extended industrial temperature range (−40°C to +85°C), and SOIC-14 package compatibility with space-constrained portable designs.
Technical Context
The AD824ARZ-14 integrates four independent JFET-input amplifiers on a complementary bipolar process, enabling input common-mode voltage extension to within 0.2 V of the negative rail and up to 1 V below the positive rail without phase reversal. Its unique input stage maintains picoamp-level bias current across −20 V to +VS input ranges.
The rail-to-rail output stage uses bipolar transistors to achieve <15 mV saturation voltage at light loads and supports capacitive loads up to 350 pF without oscillation. Each amplifier exhibits 2 MHz GBP, 50° phase margin, and −123 dB channel separation at 1 kHz-critical for multistage filtering and precision instrumentation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 3 V to 30 V single supply; ±15 V dual supply - enables direct integration into 3.3 V, 5 V, and 24 V industrial systems without level-shifting. |
| Input Bias Current | 2 pA typical at 25°C - preserves signal integrity with MΩ-range source impedances (e.g., photodiodes, strain gauges). |
| Rail-to-Rail Output | Swings within 15 mV of V+ and V− - maximizes dynamic range in low-voltage systems (e.g., 3 V battery-powered devices). |
| Gain Bandwidth Product | 2 MHz - supports stable unity-gain buffering and 10× closed-loop gain up to 200 kHz for sensor signal conditioning. |
| Supply Current per Amp | 500 µA typical at 25°C - allows full quad operation at <2.0 mA total, critical for multi-channel portable medical equipment. |
| Input Offset Voltage | 1.0 mV max (AD824A grade) - ensures ≤0.1% gain error in 100× instrumentation amplifier configurations. |
| Operating Temperature | −40°C to +85°C - qualified for extended industrial environments including remote sensors and power supply control units. |
Pinout & Package
Narrow 14-lead SOIC (R suffix) package, 3.9 mm × 8.7 mm body, 1.27 mm pitch, RoHS-compliant lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives external load; rail-to-rail swing supports full-scale signal utilization. |
| 2 | –IN A | Inverting input of Amp A - high-impedance node (10¹³ Ω) minimizes loading on high-Z sources. |
| 3 | +IN A | Noninverting input of Amp A - accepts common-mode voltages from −0.2 V to +VS − 1 V. |
| 4 | V+ | Positive supply rail - powers all four amplifiers; decoupling required within 1 cm for stability. |
| 5 | +IN B | Noninverting input of Amp B - electrically isolated from other inputs; enables independent channel configuration. |
| 6 | –IN B | Inverting input of Amp B - matched offset and bias current to Amp A for differential pair use. |
| 7 | OUT B | Amplifier B output - identical performance to OUT A; supports dual-channel signal processing. |
| 8 | OUT D | Amplifier D output - fourth independent output; used in multistage filters or reference buffering. |
| 9 | –IN D | Inverting input of Amp D - maintains 2 pA bias current specification across temperature. |
| 10 | +IN D | Noninverting input of Amp D - supports true rail-to-rail input operation up to VS − 1 V. |
| 11 | V− | Negative supply rail - connects to ground in single-supply mode; must be bypassed locally. |
| 12 | +IN C | Noninverting input of Amp C - enables third channel in quad instrumentation front ends. |
| 13 | –IN C | Inverting input of Amp C - matched to other inputs for consistent CMRR (≥60 dB over temp). |
| 14 | OUT C | Amplifier C output - completes quad functionality; used in sample-and-hold hold amplifiers or DAC buffers. |
Key Features
| Feature | Design Value |
|---|---|
| No phase reversal | Input voltage may exceed V+ by up to 200 mV without output inversion - eliminates need for clamping diodes in overvoltage-prone sensor interfaces. |
| Laser-trimmed input offset | Guaranteed ≤1.5 mV over −40°C to +85°C - reduces calibration burden in production test of portable medical devices. |
| Capacitive load drive | Stable with up to 350 pF directly on output - simplifies PCB layout for ADC driver stages without external compensation. |
| Low THD+N | 0.005% at 10 kHz (RL = ∞) - preserves signal fidelity in audio and precision measurement paths. |
| High PSRR | 70 dB minimum over 2.7 V–12 V supply range - rejects ripple in battery-powered systems with switching regulators. |
Applications
| Photo Diode Preamplifier | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Amplifying weak current signals from reverse-biased photodiodes in pulse oximeters or environmental light sensors. IC Role / Device Role / Timing Role: Transimpedance amplifier with 2 pA input bias current minimizing dark current error and enabling >1 GΩ feedback resistors. Use Value: Enables sub-picoamp resolution without active guarding or cooled components, reducing BOM cost and board area. |
Use Scenario: Signal conditioning in handheld multimeters, portable ECG monitors, and wireless sensor nodes. IC Role / Device Role / Timing Role: Quad-channel analog front end providing simultaneous buffer, gain, reference, and filter functions from a single 3.3 V rail. Use Value: Cuts total supply current to <2.0 mA while maintaining rail-to-rail dynamic range-extending battery life beyond 100 hours. |
| Medical Instrumentation | DAC Output Amplifier |
Use Scenario: Front-end amplification in portable ultrasound receivers and EEG signal chains requiring low noise and high CMRR. IC Role / Device Role / Timing Role: Low-noise (16 nV/√Hz), high-impedance buffer isolating sensitive electrodes from downstream circuitry. Use Value: Achieves ≥74 dB CMRR at 2 V common-mode range-meeting IEC 60601-1 leakage current and safety requirements. |
Use Scenario: Buffering and level-shifting DAC outputs in programmable power supplies and industrial PLC analog outputs. IC Role / Device Role / Timing Role: Rail-to-rail output driver translating 0–2.5 V DAC codes to 0–5 V system range with <15 mV headroom loss. Use Value: Eliminates external level-shifters and improves monotonicity by preserving full DAC resolution across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad FET-input op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL074CDR | Higher 30 pA input bias current; 3 MHz GBW; no guaranteed rail-to-rail output (min swing = 1.5 V from rails) | Suitable for AC-coupled audio or non-critical industrial signal paths where input impedance >100 MΩ is not required | Select when cost sensitivity outweighs precision; avoid in photodiode or high-Z transducer circuits. |
| OPA4134UA | Lower 10 fA input bias current; 4 MHz GBW; rail-to-rail input only (not output); higher 2.5 mA supply current per amp | Better for ultra-low-noise audio preamps but incompatible with single-supply rail-to-rail output requirements | Choose for audio-grade THD+N (<0.0007%) where output swing headroom is less critical than input current. |
Compared with TL074CDR and OPA4134UA, the AD824ARZ-14 uniquely balances ultra-low input bias current (2 pA), guaranteed rail-to-rail output swing, and low quiescent current (500 µA/amp) - making it the only option among the three qualified for battery-powered, high-impedance, single-supply sensor interfaces requiring full dynamic range utilization.
Availability
AD824ARZ-14 is available at Aetrix Electronics and suitable for medical instrumentation, remote sensors, and low-voltage strain gage amplifiers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD824ARZ-14 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, with design centers worldwide.
The AD824 belongs to Analog Devices' precision FET-input op amp product line, engineered specifically for low-power, single-supply sensor signal conditioning in portable medical, industrial, and instrumentation applications.
FAQ
What is the maximum capacitive load the AD824ARZ-14 can drive without compensation?
The AD824ARZ-14 is specified to remain stable with capacitive loads up to 350 pF when configured as a unity-gain follower. This capability eliminates the need for external compensation networks in many ADC driver and filter applications. For loads exceeding 350 pF, Figure 31 in the AD824ARZ-14 datasheet provides a proven RC network solution that extends drive capability to 5,000 pF with controlled overshoot. Stability is verified across the full −40°C to +85°C operating range.
Does the AD824ARZ-14 support true rail-to-rail input operation?
The AD824ARZ-14 features rail-to-rail *output* swing (within 15 mV of V+ and V−), but its input common-mode range extends only to within 1 V of V+ and 0.2 V below V−. It does not support true rail-to-rail *input* - meaning the input cannot be driven to exactly V+ without bandwidth degradation or potential phase reversal. For applications requiring full rail-to-rail input, consider the AD823 or AD8605 families. The AD824ARZ-14's input stage is optimized for high-Z sources where this limitation rarely impacts performance.
Can the AD824ARZ-14 operate from a 3.0 V single supply?
Yes, the AD824ARZ-14 is fully specified and guaranteed for operation from a 3.0 V single supply, including parametric performance such as input offset voltage (≤1.0 mV typ), supply current (500 µA/amp), and rail-to-rail output swing (within 15 mV of 0 V and 3 V). The AD824ARZ-14 datasheet includes dedicated Table 3 characterizing all key parameters at 3 V, confirming suitability for modern ultra-low-power portable designs like wearable health monitors and IoT edge sensors.
What is the thermal resistance (θJA) of the AD824ARZ-14 in its SOIC-14 package?
The AD824ARZ-14 in the 14-lead SOIC (R suffix) package has a junction-to-ambient thermal resistance (θJA) of 120°C/W under standard JEDEC PCB mounting conditions. This value assumes worst-case PCB layout (minimal copper pour). With proper thermal vias and 1-in² copper area, actual θJA can improve to ~60°C/W. At maximum rated supply current (600 µA/amp × 4 amps = 2.4 mA), power dissipation remains below 7.2 mW - resulting in negligible junction temperature rise even in sealed enclosures.
How does the AD824ARZ-14 handle input voltages exceeding the positive supply rail?
The AD824ARZ-14 does not exhibit phase reversal when inputs reach up to +VS, but driving inputs beyond +VS risks damage if unmitigated. A series current-limiting resistor (e.g., 1 kΩ) is recommended if input overvoltage exceeds +VS + 300 mV or occurs during power-up/power-down. This resistor protects internal junctions while increasing input voltage noise by <0.1 nV/√Hz - an acceptable trade-off for robustness in field-deployed sensors. The AD824ARZ-14 datasheet Figure 30b validates this protection scheme.
AD824ARZ-14 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:
- J-FET
- Number of Circuits:
- 4
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 2V/µs
- Gain Bandwidth Product:
- 2 MHz
- -3db Bandwidth:
- 2 MHz
- Current - Input Bias:
- 4 pA
- Voltage - Input Offset:
- 500 µV
- Current - Supply:
- 560µA (x4 Channels)
- Current - Output / Channel:
- 12 mA
- Voltage - Supply Span (Min):
- 3 V
- Voltage - Supply Span (Max):
- 30 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
AD824ARZ-14 FAQ
1.How can I place an order for AD824ARZ-14 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD824ARZ-14 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 AD824ARZ-14 reliable?
The price and inventory of AD824ARZ-14 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD824ARZ-14 is usually 5 days.
3.What payment methods are accepted for AD824ARZ-14?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD824ARZ-14 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD824ARZ-14?
AD824ARZ-14 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD824ARZ-14 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 AD824ARZ-14?
For technical support, including AD824ARZ-14 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD824ARZ-14 requirements.
6.How does Aetrix verify that AD824ARZ-14 is sourced from the original manufacturer or authorized distributors?
All AD824ARZ-14 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 AD824ARZ-14 meets industry standards.
7.What is the process for return or replacement of AD824ARZ-14?
All AD824ARZ-14 units undergo pre-shipment inspection (PSI). If there is an issue with AD824ARZ-14, 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 AD824ARZ-14 part is unused and in its original packaging.
Return procedure for AD824ARZ-14:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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