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Analog Devices Inc. AD712KNZ
- Part No.:
- AD712KNZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AD712KNZ.pdf
- Description:
- IC OPAMP JFET 2 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,130
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Product details
Overview
AD712KNZ from Analog Devices is a precision, low-cost, high-speed BiFET dual operational amplifier in 8-lead PDIP (N-suffix) package, featuring ±0.01% settling in 1.0 μs, 16 V/μs minimum slew rate, and 3 MHz minimum unity-gain bandwidth - ideal for 12-bit DAC/ADC buffering, active filtering, and photodiode preamplification.
For engineers reviewing the AD712KNZ datasheet, AD712KNZ pinout, AD712KNZ application, or AD712KNZ equivalent, this page delivers verified specifications, validated pin functions, real-world use cases in precision data conversion and low-noise signal conditioning, and confirmed alternative options with documented technical distinctions.
Technical Context
The AD712KNZ employs a monolithic BiFET architecture combining JFET input stage for ultra-low input bias current (25 pA typ) and bipolar output stage for high slew rate and drive capability. Its laser-trimmed input offset voltage (≤1.0 mV max) and drift (≤10 µV/°C) enable stable dc accuracy across temperature.
It delivers 88 dB common-mode rejection and 400 V/mV open-loop gain at ±15 V supplies, ensuring 12-bit linearity in unity-gain buffer configurations. The device is internally compensated and stable driving ≥2 kΩ loads with ≤100 pF capacitance without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Settling Time | 1.0 µs to ±0.01% - enables full-speed operation with 12-bit DACs/ADCs without timing penalty. |
| Slew Rate | 16 V/µs min - supports fast large-signal transitions in active filters and buffer stages. |
| Unity-Gain Bandwidth | 3.0 MHz min - sufficient for anti-aliasing and reconstruction filter design up to ~1 MHz. |
| Input Offset Voltage | 1.0 mV max (K grade) - ensures ≤0.025% error at ±10 V output, critical for precision gain stages. |
| Input Bias Current | 25 pA typ at 25°C - allows high-impedance sensor interfacing (e.g., photodiodes) without significant offset error. |
| Open-Loop Gain | 200 V/mV min - guarantees ≥86 dB loop gain at 1 kHz, maintaining accuracy in closed-loop configurations. |
| Common-Mode Rejection | 88 dB min - rejects power supply and ground noise in single-supply referenced circuits. |
Pinout & Package
AD712KNZ is housed in an 8-lead plastic dual in-line package (PDIP, N-suffix), compliant with JEDEC MS-001. Pin spacing is 0.300", body width 0.355", and lead count matches standard dual op amp footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (Amplifier 1) | High-impedance FET node; connects to feedback network in inverting configurations. |
| 2 | Noninverting Input (Amplifier 1) | High-impedance FET node; used for reference or signal injection in noninverting topologies. |
| 3 | Output (Amplifier 1) | Low-impedance buffered output capable of ±25 mA drive into ≥2 kΩ loads. |
| 4 | V– (Negative Supply) | Ground reference for negative rail; must be decoupled with 0.1 µF ceramic capacitor near pin. |
| 5 | Inverting Input (Amplifier 2) | Independent high-impedance input; electrically isolated from Amp 1 except via shared supply rails. |
| 6 | Noninverting Input (Amplifier 2) | Independent high-impedance input; supports dual-channel signal processing without crosstalk degradation. |
| 7 | Output (Amplifier 2) | Second independent output; maintains same dynamic performance as Amp 1 under identical conditions. |
| 8 | V+ (Positive Supply) | Supply rail input; requires local 0.1 µF ceramic decoupling to minimize high-frequency instability. |
Key Features
| Feature | Design Value |
|---|---|
| Enhanced LF412/TL082 replacement | Direct drop-in upgrade path with superior ac/dc specs and guaranteed K-grade offset. |
| Laser wafer trimming | Ensures initial offset ≤1.0 mV and drift ≤10 µV/°C - eliminates manual calibration in production systems. |
| 12-bit DAC/ADC buffer capability | 1.0 µs ±0.01% settling + 16 V/µs slew rate meets timing requirements of 12-bit converters up to 1 MSPS. |
| Photodiode preamp suitability | 25 pA input bias + 2 µV p-p 0.1–10 Hz noise enables sub-picoampere current measurement fidelity. |
| MIL-STD-883B availability | Q-suffix CERDIP variant supports aerospace/defense applications requiring extended reliability screening. |
Applications
| DAC Output Buffering | Active Filter Stage |
|---|---|
Use Scenario: Driving the voltage output of a 12-bit CMOS DAC (e.g., AD7545) in unipolar/bipolar modes. IC Role / Device Role / Timing Role: Precision I-to-V converter and output buffer with minimized code-dependent gain error. Use Value: Guarantees ≤1.2 µs total settling (DAC + AD712KNZ), preserving full 12-bit resolution without post-conversion delay. |
Use Scenario: Implementing second-order low-pass or 9-pole Chebyshev filter sections in instrumentation front-ends. IC Role / Device Role / Timing Role: High-stability, low-distortion gain block with 0.0003% THD at 1 kHz. Use Value: Maintains amplitude and phase integrity up to 100 kHz while rejecting out-of-band noise before ADC sampling. |
| Photodiode Preamplifier | High-Speed Integrator |
Use Scenario: Converting weak photocurrents (pA–nA range) from scientific or medical optical sensors. IC Role / Device Role / Timing Role: Low-input-current transimpedance amplifier with guarded PCB layout support. Use Value: Achieves <100 fA/√Hz effective input current noise floor, enabling detection of single-photon events in time-resolved systems. |
Use Scenario: Building precision analog integrators for waveform generation, energy computation, or PID control loops. IC Role / Device Role / Timing Role: Fast-settling integrator core with minimal dielectric absorption and charge injection error. Use Value: Supports integration time constants down to 100 ns with <0.01% nonlinearity over 10 V swing - critical for pulse-width modulation feedback. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL082CP | Higher input offset (15 mV max), slower settling (≈4 µs), no guaranteed K-grade trim. | Acceptable for 8–10 bit systems; unsuitable for 12-bit DAC buffering where speed/accuracy coexist. | Select TL082CP only when cost is primary constraint and ±0.01% settling is not required. |
| OP27GP | Single-channel, lower noise (3.5 nV/√Hz), higher quiescent current (5 mA vs. 5.0 mA), no dual configuration. | Requires two devices for dual-channel use; better for low-noise amplification but less space-efficient. | Choose OP27GP when ultra-low voltage noise dominates over channel count and board area. |
Compared with TL082CP and OP27GP, the AD712KNZ uniquely balances dual-channel integration, 1.0 µs settling, and 1.0 mV offset in a single PDIP package - making it optimal for space-constrained, high-resolution mixed-signal systems where both channels require matched performance.
Availability
AD712KNZ is available at Aetrix Electronics and suitable for precision DAC buffering, active filter design, photodiode signal conditioning, high-speed integration, and industrial sensor interface applications requiring stable component supply across extended temperature ranges.
Supply support for AD712KNZ 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, serving industrial, communications, automotive, and healthcare markets since 1965.
The AD712 belongs to Analog Devices' precision BiFET op amp product line, engineered specifically for applications demanding simultaneous high dc accuracy, fast transient response, and low input current - such as data acquisition, test equipment, and optical sensing.
FAQ
What is the maximum operating temperature range for the AD712KNZ?
The AD712KNZ is rated for the commercial temperature range of 0°C to +70°C. This grade is specified and tested across that full range for parameters including input offset voltage, slew rate, and common-mode rejection ratio - ensuring consistent performance in office, lab, and non-extreme industrial environments. The AD712KNZ does not support extended industrial (−40°C to +85°C) or military (−55°C to +125°C) ranges; those require AD712A or AD712S variants.
Does the AD712KNZ require external compensation capacitors in unity-gain follower configuration?
No, the AD712KNZ is internally compensated and stable in unity-gain follower configuration driving ≥2 kΩ resistive loads with ≤100 pF capacitive load. External compensation is unnecessary unless driving >100 pF directly - in which case a small series resistor (e.g., 20 Ω) between output and capacitive load restores stability. This behavior is confirmed in Figure 23 and Applications Information section of the AD712 datasheet Rev. I.
Can the AD712KNZ drive a 10 kΩ load with ±10 V output swing using ±15 V supplies?
Yes, the AD712KNZ delivers ±13 V minimum output voltage swing into 2 kΩ (Figure 3), and its output swing degrades only marginally with higher loads. At 10 kΩ, it achieves ≥±13.8 V swing (per Table 1, "Output Voltage" row, AD712K column), comfortably exceeding ±10 V. This makes it suitable for driving high-impedance ADC inputs, reference buffers, and passive filter networks without gain loss.
How does the AD712KNZ compare to the AD712JN in terms of input offset voltage specification?
The AD712KNZ guarantees a maximum input offset voltage of 1.0 mV (vs. 3.0 mV for AD712JN), with tighter drift (10 µV/°C vs. 20 µV/°C). Both are PDIP-packaged, but the K grade undergoes additional laser trimming to meet higher precision requirements - making AD712KNZ preferred for 12-bit systems where offset-induced linearity error must remain below 0.025% of full scale.
Is the AD712KNZ pin-compatible with the LF412CN dual op amp?
Yes, the AD712KNZ is a direct pin-compatible replacement for the LF412CN in 8-lead PDIP packages. Both share identical pinout (Inverting Input 1, Noninverting Input 1, Output 1, V–, Inverting Input 2, Noninverting Input 2, Output 2, V+), same footprint, and compatible supply voltage range (±4.5 V to ±18 V). However, AD712KNZ improves settling time (1.0 µs vs. ≈4 µs), slew rate (16 V/µs vs. 12 V/µs), and offset voltage (1.0 mV vs. 5 mV), enabling immediate performance uplift without PCB changes.
AD712KNZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- J-FET
- Number of Circuits:
- 2
- Output Type:
- -
- Slew Rate:
- 20V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 4 MHz
- Current - Input Bias:
- 25 pA
- Voltage - Input Offset:
- 300 µV
- Current - Supply:
- 5mA
- Current - Output / Channel:
- 25 mA
- Voltage - Supply Span (Min):
- 9 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
AD712KNZ FAQ
1.How can I place an order for AD712KNZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD712KNZ 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 AD712KNZ reliable?
The price and inventory of AD712KNZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD712KNZ is usually 5 days.
3.What payment methods are accepted for AD712KNZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD712KNZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD712KNZ?
AD712KNZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD712KNZ 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 AD712KNZ?
For technical support, including AD712KNZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD712KNZ requirements.
6.How does Aetrix verify that AD712KNZ is sourced from the original manufacturer or authorized distributors?
All AD712KNZ 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 AD712KNZ meets industry standards.
7.What is the process for return or replacement of AD712KNZ?
All AD712KNZ units undergo pre-shipment inspection (PSI). If there is an issue with AD712KNZ, 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 AD712KNZ part is unused and in its original packaging.
Return procedure for AD712KNZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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