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Analog Devices Inc. AD712KRZ
- Part No.:
- AD712KRZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD712KRZ.pdf
- Description:
- IC OPAMP JFET 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:202
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Product details
Overview
AD712KRZ from Analog Devices is a precision, low-cost, high-speed BiFET dual operational amplifier optimized for 12-bit DAC/ADC buffering and active filter applications. It delivers ±0.01% settling in 1.0 µs, 16 V/µs minimum slew rate, 3 MHz minimum unity-gain bandwidth, and 200 V/mV minimum open-loop gain - enabling high-fidelity signal conditioning in data acquisition systems.
For engineers reviewing the AD712KRZ datasheet, AD712KRZ pinout, AD712KRZ application, or AD712KRZ equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation guidance, and two rigorously confirmed alternative op amps for precision analog signal paths.
Technical Context
The AD712KRZ employs a monolithic BiFET architecture with laser-trimmed input stage, delivering ultra-low input bias current (25 pA typ at 25°C) and low input offset voltage drift (7 µV/°C max). Its internal compensation ensures stable unity-gain operation while supporting 250 pF capacitive loads without oscillation.
It features matched dual amplifiers with crosstalk >120 dB at 1 kHz and >90 dB at 100 kHz, enabling precise differential signal processing. The device operates from ±4.5 V to ±18 V supplies, with quiescent current of 5.0 mA (typ), and maintains 12-bit accuracy across 0°C to 70°C (K-grade).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Slew Rate | 16 V/µs min - enables clean 10 V step response within 1 µs for DAC output buffering |
| Settling Time | 1.0 µs to ±0.01% - guarantees sub-LSB error stability for 12-bit converters |
| Unity-Gain Bandwidth | 3.0 MHz min - supports wideband active filters up to ~300 kHz closed-loop |
| Open-Loop Gain | 200 V/mV min - ensures <0.005% gain error in precision buffer configurations |
| Input Bias Current | 25 pA typ - preserves signal integrity in photodiode preamp and high-Z sensor interfaces |
| CMRR | 88 dB min - maintains 12-bit linearity in noisy industrial environments with common-mode transients |
| Supply Range | ±4.5 V to ±18 V - compatible with legacy ±15 V systems and modern low-voltage designs |
Pinout & Package
AD712KRZ is supplied in an 8-lead SOIC_N (R-suffix) package, measuring 5.0 mm × 6.2 mm × 1.75 mm, with standard gull-wing leads and JEDEC MS-012AC footprint compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (Amp 1) | High-impedance node for feedback configuration; requires guarding in electrometer use |
| 2 | Noninverting Input (Amp 1) | Reference point for single-ended or differential gain stages; low leakage critical |
| 3 | Output (Amp 1) | Capable of driving 2 kΩ load to ±13 V; stable with ≥250 pF capacitive load |
| 4 | V– | Negative supply rail connection; must be decoupled with 0.1 µF ceramic near pin |
| 5 | Inverting Input (Amp 2) | Independent second channel input; matched offset and drift to Amp 1 |
| 6 | Noninverting Input (Amp 2) | Second channel reference; crosstalk >120 dB prevents inter-channel interference |
| 7 | Output (Amp 2) | Electrically isolated output path; supports dual-buffer or differential drive topologies |
| 8 | V+ | Positive supply rail; requires local 0.1 µF ceramic decoupling for high-frequency PSRR |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed input stage | Guarantees ≤1.0 mV initial input offset voltage (K-grade), reducing calibration overhead in precision systems |
| BiFET input architecture | Delivers 25 pA typical input bias current - essential for photodiode preamps and picoampere current-to-voltage conversion |
| Matched dual amplifiers | Input offset voltage matching ≤3 mV and drift matching ≤20 µV/°C enable accurate differential signal processing |
| Stable unity-gain operation | Compensated for ≥250 pF capacitive loads without external compensation - simplifies DAC buffer layout |
| High PSRR & CMRR | 80 dB min PSRR and 88 dB min CMRR ensure 12-bit performance in electrically noisy industrial environments |
Applications
| DAC Output Buffering | Photodiode Preamplification |
|---|---|
Use Scenario: Driving the voltage output of a 12-bit CMOS DAC (e.g., AD7545) in unipolar/bipolar modes with minimal code-dependent nonlinearity. IC Role / Device Role / Timing Role: Precision current-to-voltage converter and fast-settling output buffer; handles dynamic DAC output impedance (11–33 kΩ) while maintaining <0.01% settling. Use Value: Enables full 12-bit DAC performance by minimizing noise-gain-induced offset modulation and achieving 1.0 µs ±0.01% settling. |
Use Scenario: Amplifying low-level photocurrents (pA–nA range) from reverse-biased photodiodes in spectroscopy or medical sensors. IC Role / Device Role / Timing Role: Ultra-low-input-bias-current transimpedance amplifier; configured with guarded PCB layout to suppress leakage. Use Value: Achieves sub-picoampere input current resolution due to 25 pA typical bias current and 2 µV p-p 0.1–10 Hz noise. |
| Active Filter Design | ADC Input Buffering |
Use Scenario: Implementing high-order active filters (e.g., 9-pole Chebyshev) requiring low distortion and wide bandwidth. IC Role / Device Role / Timing Role: High-linearity gain block in Sallen-Key or multiple-feedback topologies; maintains THD <−100 dB at 1 kHz. Use Value: Supports filter cutoff frequencies up to ~300 kHz with <0.0003% THD, preserving signal fidelity in anti-aliasing and reconstruction stages. |
Use Scenario: Isolating and driving the analog input of a 12-bit successive-approximation ADC (e.g., AD574A) under dynamic switching loads. IC Role / Device Role / Timing Role: Low-output-impedance unity-gain buffer that maintains stable voltage during ADC sampling transients. Use Value: Prevents conversion errors caused by transient loading via 25 Ω effective output impedance at DC and robust loop gain up to 100 kHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision dual op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OP270GPZ | Lower input offset (25 µV max), higher cost, slower slew rate (2.4 V/µs), lower bandwidth (1.5 MHz) | Better dc precision but unsuitable for DAC buffering requiring fast settling | Select when ultra-low offset dominates over speed; avoid for >100 kHz signal paths |
| TL082CDR | Higher input bias current (30 nA), no laser trimming, wider offset spread (15 mV max), lower CMRR (70 dB) | Cost-optimized general-purpose use; lacks 12-bit accuracy guarantee over temperature | Select only for non-critical, low-resolution (<10-bit) or cost-constrained designs |
Compared with OP270GPZ and TL082CDR, the AD712KRZ uniquely balances 1.0 µs settling, 25 pA bias current, and 88 dB CMRR - making it the only option among the three qualified for simultaneous 12-bit precision and high-speed DAC/ADC interfacing without external trimming or compensation.
Availability
AD712KRZ is available at Aetrix Electronics and suitable for precision data acquisition, industrial sensor signal conditioning, and high-fidelity audio front-end designs requiring stable component supply and long-term parametric consistency.
Supply support for AD712KRZ 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 decades of expertise in precision amplifier design.
The AD712KRZ belongs to Analog Devices' legacy BiFET op amp product line, engineered specifically for applications demanding both high-speed settling and precision dc performance - notably DAC/ADC buffering, active filtering, and low-leakage sensor interfaces.
FAQ
What is the guaranteed input offset voltage specification for AD712KRZ?
The AD712KRZ (K-grade) guarantees a maximum input offset voltage of 1.0 mV at 25°C after 5 minutes of operation, with a worst-case drift of 7 µV/°C over temperature. This is verified per Analog Devices Rev. I datasheet Table 1 and enables direct 12-bit system accuracy without nulling circuitry in many applications.
Can AD712KRZ drive a 1000 pF capacitive load stably?
No - the AD712KRZ is compensated for stable unity-gain operation with up to 250 pF capacitive load, as confirmed in the "Optimizing Settling Time" section (Page 11) and Figure 23 test circuit. Driving 1000 pF requires external isolation or compensation; exceeding 250 pF risks peaking or oscillation without modification.
Is AD712KRZ pin-compatible with LF412 or TL082?
Yes - AD712KRZ uses the industry-standard 8-pin SOIC_N (R-suffix) pinout identical to LF412 and TL082, including V+, V–, dual inverting/noninverting inputs, and dual outputs. This allows drop-in replacement in existing layouts, though performance improvements (e.g., 16 V/µs vs. 13 V/µs slew) may require minor stability review.
What is the maximum operating supply voltage for AD712KRZ?
The AD712KRZ supports a maximum supply voltage of ±18 V, as specified in the Absolute Maximum Ratings table (Page 5). Operation beyond this risks permanent damage; the rated performance range is ±15 V, and functional operation is guaranteed from ±4.5 V to ±18 V per the Power Supply section.
Does AD712KRZ support rail-to-rail input or output?
No - AD712KRZ has limited input common-mode range (−VS + 4 V to +VS − 2 V) and output swing (±12.5 V typical on ±15 V supplies), as shown in Figures 2 and 3. It is not a rail-to-rail device; inputs must stay ≥4 V from negative rail and ≥2 V from positive rail to avoid phase reversal or distortion.
AD712KRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AD712KRZ FAQ
1.How can I place an order for AD712KRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD712KRZ 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 AD712KRZ reliable?
The price and inventory of AD712KRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD712KRZ is usually 5 days.
3.What payment methods are accepted for AD712KRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD712KRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD712KRZ?
AD712KRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD712KRZ 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 AD712KRZ?
For technical support, including AD712KRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD712KRZ requirements.
6.How does Aetrix verify that AD712KRZ is sourced from the original manufacturer or authorized distributors?
All AD712KRZ 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 AD712KRZ meets industry standards.
7.What is the process for return or replacement of AD712KRZ?
All AD712KRZ units undergo pre-shipment inspection (PSI). If there is an issue with AD712KRZ, 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 AD712KRZ part is unused and in its original packaging.
Return procedure for AD712KRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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