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Analog Devices Inc. AD824AR-14-REEL7
- Part No.:
- AD824AR-14-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD824AR-14-REEL7.pdf
- Description:
- IC OPAMP JFET 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,151
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Product details
Overview
AD824AR-14-REEL7 from Analog Devices is a quad, FET-input, rail-to-rail output 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 precision amplification of high-impedance sensors in battery-powered medical and instrumentation systems.
For engineers reviewing the AD824AR-14-REEL7 datasheet, AD824AR-14-REEL7 pinout, AD824AR-14-REEL7 application, or AD824AR-14-REEL7 equivalent, key selection criteria include guaranteed rail-to-rail output swing (within 15 mV of rails), low 500 µA per-amplifier supply current, wide −40°C to +85°C operating range, and compatibility with capacitive loads up to 350 pF without oscillation.
Technical Context
The AD824AR-14-REEL7 integrates four independent JFET-input amplifiers on a complementary bipolar process, enabling input voltage operation from −0.2 V below V− to within 1 V of V+ without phase reversal. Its unique input stage maintains picoamp-level bias current across extended common-mode ranges, including down to −VS − 0.2 V.
The rail-to-rail output stage uses a bipolar architecture delivering 15 mV saturation voltage at light load and sustaining stable operation into 350 pF capacitive loads. Channel separation exceeds −123 dB at 1 kHz, supporting multistage filtering in compact single-supply signal chains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3 V to 30 V single supply; supports ±15 V dual supply - enables direct integration into 3.3 V, 5 V, and industrial 24 V systems. |
| Input Bias Current | 2 pA typical at 25°C - permits use with MΩ-range source impedances (e.g., photodiode, strain gage) without significant DC error. |
| Rail-to-Rail Output Swing | Within 15 mV of V+ and V− at 20 µA load - preserves dynamic range in low-voltage systems (e.g., 3 V medical sensors). |
| Gain Bandwidth Product | 2 MHz - supports stable unity-gain buffers and 10× closed-loop amplifiers up to 200 kHz. |
| Slew Rate | 2 V/µs - ensures faithful reproduction of fast transients in DAC output buffering and sample-and-hold circuits. |
| Input Offset Voltage | 0.1–1.0 mV (AD824A grade) - enables high-accuracy DC-coupled amplification without external trimming. |
| Operating Temperature | −40°C to +85°C - qualified for extended industrial environments including portable diagnostic equipment. |
Pinout & Package
AD824AR-14-REEL7 is housed in a narrow 14-lead SOIC (R suffix) package with standard JEDEC outline and 1.27 mm pitch. Thermal resistance θJA = 120°C/W, θJC = 36°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives loads up to ±12 mA; rail-to-rail swing enables full utilization of supply headroom. |
| 2 | −IN A | Inverting input of Amp A - high-impedance node (1013 Ω || 3.3 pF); requires guarding in high-Z sensor interfaces. |
| 3 | +IN A | Noninverting input of Amp A - same impedance as Pin 2; safe common-mode range extends to V− − 0.2 V and V+ − 1 V. |
| 4 | V+ | Positive supply rail - accepts 3 V to 30 V single supply or +15 V in dual-supply mode. |
| 5 | +IN B | Noninverting input of Amp B - electrically isolated from other channels; supports independent biasing. |
| 6 | −IN B | Inverting input of Amp B - identical electrical characteristics to Pins 2 and 3. |
| 7 | OUT B | Amplifier B output - fully independent channel; no crosstalk degradation beyond −123 dB at 1 kHz. |
| 8 | OUT D | Amplifier D output - fourth channel; shares same performance specs and layout considerations as Pins 1 and 7. |
| 9 | −IN D | Inverting input of Amp D - matches input behavior across all four amplifiers per datasheet Table 1–3. |
| 10 | +IN D | Noninverting input of Amp D - supports differential configurations with matched offset drift (2 µV/°C). |
| 11 | V− | Negative supply rail - tied to ground in single-supply operation; supports −15 V in dual-supply mode. |
| 12 | +IN C | Noninverting input of Amp C - enables simultaneous multi-channel signal conditioning (e.g., 4-sensor array). |
| 13 | −IN C | Inverting input of Amp C - identical noise and CMRR performance to other inputs (74 dB min at 0–1 V CM range). |
| 14 | OUT C | Amplifier C output - completes quad configuration; allows independent gain stages without external op amp count increase. |
Key Features
| Feature | Design Value |
|---|---|
| No phase reversal | Input voltages up to +VS do not invert output polarity - eliminates risk of latch-up in sensor front ends with transient overdrive. |
| Laser-trimmed input offset | Guaranteed ≤1.5 mV over −40°C to +85°C - reduces calibration burden in portable instrumentation. |
| Capacitive load drive | Stable with up to 350 pF directly on output - avoids need for isolation resistors in ADC driver or filter applications. |
| Low THD + N | 0.005% at 10 kHz (AV = +1, RL = ∞) - preserves signal fidelity in audio and precision measurement paths. |
| High CMRR | 74 dB minimum at 0–1 V common-mode range (3 V supply) - rejects power rail noise in battery-powered systems. |
Applications
| Photo Diode Preamplifier | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Amplifying weak current from reverse-biased photodiodes in pulse oximeters or environmental light sensors. IC Role / Device Role / Timing Role: Transimpedance amplifier with ultra-low input bias current (2 pA) minimizing dark current error. Use Value: Enables >100 dB dynamic range using MΩ feedback resistors without significant DC offset drift. | Use Scenario: Signal conditioning in handheld ECG monitors or portable gas analyzers powered by coin-cell or Li-ion batteries. IC Role / Device Role / Timing Role: Quad-channel analog front end providing simultaneous sensor buffering, reference generation, and DAC output amplification. Use Value: 500 µA per amplifier supply current extends battery life; rail-to-rail output maximizes SNR in 3 V systems. |
| Medical Instrumentation | Low-Voltage Strain Gage Amplifier |
Use Scenario: Front-end amplification for disposable biosensors requiring high accuracy and low power in point-of-care diagnostics. IC Role / Device Role / Timing Role: Precision DC-coupled amplifier with <1.5 mV max offset and 2 µV/°C drift for stable baseline measurements. Use Value: Eliminates need for auto-zero circuitry; laser-trimmed matching supports ratiometric bridge measurements. | Use Scenario: Wheatstone bridge excitation and differential amplification in structural health monitoring or industrial load cells. IC Role / Device Role / Timing Role: Dual-op-amp configuration: one buffer for bridge reference, one inverter for negative excitation, third for instrumentation amp gain. Use Value: FET inputs prevent loading of high-resistance bridge elements; rail-to-rail output preserves full-scale resolution. |
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 input bias current (30 pA typ), no rail-to-rail output (±12 V swing on ±15 V supply), 3 MHz GBW | Not suitable for 3 V single-supply or high-impedance sensor interfaces requiring sub-mV offset | Select only when cost sensitivity outweighs precision and low-voltage requirements. |
| OPA4134UA | Lower input bias current (1 pA typ), rail-to-rail output, 4 MHz GBW, higher supply current (2 mA per amp) | Better noise performance but incompatible with ultra-low-power designs needing <2 mA total quiescent current | Prefer for audio-grade applications where THD+N < 0.0005% is critical and power budget allows. |
Compared with TL074CDR and OPA4134UA, AD824AR-14-REEL7 uniquely balances ultra-low input bias current (2 pA), rail-to-rail output (15 mV rail margin), and low 500 µA per-amplifier supply current-making it optimal for battery-powered medical sensors where precision, voltage headroom, and energy efficiency are simultaneously constrained.
Availability
AD824AR-14-REEL7 is available at Aetrix Electronics and suitable for battery-powered instrumentation, medical diagnostics, and remote sensor systems requiring stable component supply across long production lifecycles.
Supply support for AD824AR-14-REEL7 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 AD824 belongs to Analog Devices' precision operational amplifier product line, designed specifically for low-power, high-impedance signal conditioning in portable and industrial instrumentation where rail-to-rail operation and picoamp input bias are essential.
FAQ
What is the maximum capacitive load the AD824AR-14-REEL7 can drive without compensation?
The AD824AR-14-REEL7 is specified to remain stable with capacitive loads up to 350 pF when used in unity-gain follower configuration. This capability eliminates the need for series isolation resistors in many ADC driver and filter applications. For loads exceeding 350 pF, external compensation (e.g., Figure 31 in the AD824 datasheet) is required to maintain phase margin above 50° and prevent peaking or oscillation. The 350 pF limit applies across the full −40°C to +85°C temperature range and all supply voltages from 3 V to 30 V.
Does the AD824AR-14-REEL7 support true single-supply operation down to 3 V?
Yes, the AD824AR-14-REEL7 is fully specified and guaranteed for operation from a 3 V single supply, including rail-to-rail output swing (within 15 mV of both rails), input common-mode range extending from −0.2 V to +1 V, and 500 µA per-amplifier supply current. The AD824A−3V variant (covered in Table 3 of the datasheet) confirms parametric performance at 3 V, with input offset voltage ≤1.5 mV over temperature and CMRR ≥56 dB. This makes AD824AR-14-REEL7 suitable for direct integration into 3.3 V and 3 V battery-powered systems without level-shifting circuitry.
Can the AD824AR-14-REEL7 be used in a photodiode transimpedance amplifier?
Yes, the AD824AR-14-REEL7 is well-suited for photodiode transimpedance amplifiers due to its 2 pA typical input bias current, which minimizes dark current error and enables use of high-value feedback resistors (e.g., 10 MΩ to 1 GΩ). Its rail-to-rail output allows full utilization of the 3 V to 30 V supply range, and its 2 MHz gain bandwidth supports bandwidths up to ~160 kHz with a 10 MΩ resistor and 10 pF total input capacitance. Layout best practices-including guard rings around the inverting input and low-leakage PCB materials-are recommended to preserve the device's picoamp-level performance.
What is the guaranteed input offset voltage specification for AD824AR-14-REEL7 over temperature?
The AD824AR-14-REEL7 (AD824A grade) guarantees a maximum input offset voltage of 1.5 mV over the full −40°C to +85°C operating temperature range, as specified in Table 1 of the datasheet. At 25°C, the typical offset is 0.1 mV with a maximum of 1.0 mV. The offset voltage drift is tightly controlled at 2 µV/°C, ensuring predictable drift behavior across temperature. This performance is achieved through laser trimming of the input stage and is validated during production test-not derived from extrapolation or typical-only data.
Is the AD824AR-14-REEL7 pin-compatible with other quad op amps in SOIC-14 packages?
No, the AD824AR-14-REEL7 has a proprietary pinout optimized for quad-channel independence and thermal symmetry-not pin-compatible with industry-standard quad op amps like LM324, TL074, or OP484. Its pin assignment (e.g., V+ on Pin 4, V− on Pin 11, interleaved input/output per channel) differs significantly from conventional layouts. PCB redesign is required when substituting AD824AR-14-REEL7 into existing footprints. Always verify pin functions against Figure 1 (14-Lead SOIC) in the AD824 datasheet Rev. E before layout integration.
AD824AR-14-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
AD824AR-14-REEL7 FAQ
1.How can I place an order for AD824AR-14-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD824AR-14-REEL7 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 AD824AR-14-REEL7 reliable?
The price and inventory of AD824AR-14-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD824AR-14-REEL7 is usually 5 days.
3.What payment methods are accepted for AD824AR-14-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD824AR-14-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD824AR-14-REEL7?
AD824AR-14-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD824AR-14-REEL7 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 AD824AR-14-REEL7?
For technical support, including AD824AR-14-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD824AR-14-REEL7 requirements.
6.How does Aetrix verify that AD824AR-14-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD824AR-14-REEL7 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 AD824AR-14-REEL7 meets industry standards.
7.What is the process for return or replacement of AD824AR-14-REEL7?
All AD824AR-14-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD824AR-14-REEL7, 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 AD824AR-14-REEL7 part is unused and in its original packaging.
Return procedure for AD824AR-14-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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