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Analog Devices Inc. AD711KNZ
- Part No.:
- AD711KNZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AD711KNZ.pdf
- Description:
- IC OPAMP JFET 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:200
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Product details
Overview
AD711KNZ from Analog Devices is a precision, high-speed BiFET operational amplifier in an 8-pin plastic DIP package, delivering 3 MHz unity-gain bandwidth, 16 V/µs slew rate, and 0.25 mV max input offset voltage (C-grade spec, applicable per datasheet grading). It serves as a buffer for 12-bit DACs/ADCs and low-noise photodiode preamplifiers in industrial instrumentation.
For engineers reviewing the AD711KNZ datasheet, AD711KNZ pinout, AD711KNZ application, or AD711KNZ equivalent, key selection criteria include settling time to ±0.01% (1.0 ms), input bias current ≤25 pA (C-grade), 0.1–10 Hz noise ≤4 µVp-p, and guaranteed open-loop gain ≥200 V/mV - all validated under ±15 V supply at 25°C.
Technical Context
The AD711KNZ employs laser-trimmed JFET input stage architecture enabling ultra-low input bias current (≤25 pA) and drift (≤5 µV/°C), critical for high-impedance sensor interfaces. Its compensated internal design achieves stable unity-gain operation while driving ≥100 pF capacitive loads without external compensation.
It features standard dual-supply op amp topology with offset null pins (1 & 5), rail-to-rail input common-mode range (–VS + 4 V to +VS – 2 V), and output swing of ±13 V into 2 kΩ - optimized for precision active filtering and data converter buffering where dc accuracy and transient fidelity are co-constrained.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Unity-Gain Bandwidth | 3.0 MHz min - ensures stable closed-loop gain ≥1 with phase margin >60° up to 20 kHz in filter designs. |
| Slew Rate | 16 V/µs min - enables full-scale 10 V step settling within 1.0 µs before dominant settling phase begins. |
| Input Offset Voltage | 0.25 mV max (C-grade) - supports 12-bit linearity (±0.025% FSR error) over industrial temperature range. |
| Input Bias Current | 25 pA max (C-grade, 25°C) - limits voltage error to <0.25 mV across 10 MΩ source impedance. |
| 0.1–10 Hz Noise | 4 µVp-p max - guarantees sub-LSB noise floor for 12-bit systems sampling at ≤100 SPS. |
| Open-Loop Gain | 200 V/mV min - provides ≥80 dB loop gain at 10 kHz, ensuring <0.01% gain error in precision integrators. |
| Common-Mode Rejection | 86 dB min - maintains 12-bit accuracy even with ±10 V common-mode shift on inputs. |
Pinout & Package
AD711KNZ is housed in an 8-pin plastic dual-in-line package (N-8), compliant with JEDEC MS-001, with 0.3 inch body width and 0.1 inch lead pitch. Pin 4 connects internally to the metal can case (ground reference point).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Null | Connects to wiper of 10 kΩ potentiometer between Pins 4 and 5 to trim input offset voltage. |
| 2 | Inverting Input (–) | High-impedance JFET node; accepts feedback network for inverting configurations. |
| 3 | Noninverting Input (+) | High-impedance JFET node; referenced to system ground or signal source in noninverting buffers. |
| 4 | –VS / Case | Negative supply rail connection; also tied to metal can shield for EMI suppression. |
| 5 | Offset Null | Completes offset trim circuit; symmetric adjustment with Pin 1 minimizes thermal drift contribution. |
| 6 | Output | Class-A output stage capable of ±25 mA short-circuit current; drives 2 kΩ load to ±13 V. |
| 7 | +VS | Positive supply rail; operates from ±4.5 V to ±18 V; quiescent current 2.5–2.8 mA typical. |
| 8 | No Connect | Internally unconnected; must remain floating - no external tie or bypass required. |
Key Features
| Feature | Design Value |
|---|---|
| Laser wafer trimming | Enables 0.25 mV max input offset and 3 µV/°C max drift - eliminates need for external calibration in production test. |
| Guaranteed 100% tested slew rate | 16 V/µs minimum ensures predictable settling behavior in DAC buffer applications without derating. |
| Ion-implanted JFET inputs | Deliver 25 pA max input bias current - preserves signal integrity in photodiode and electrometer circuits. |
| Low 1/f noise profile | 4 µVp-p (0.1–10 Hz) enables DC-coupled sensor front-ends without AC coupling artifacts. |
| Stable unity-gain configuration | Drives ≥100 pF capacitive loads without oscillation - simplifies PCB layout for ADC/DAC interface paths. |
Applications
| Photodiode Preamp | DAC Output Buffer |
|---|---|
Use Scenario: Amplifying weak current from silicon photodiodes in spectrophotometers and medical pulse oximeters. IC Role / Device Role / Timing Role: Transimpedance amplifier with ultra-low input bias current and sub-mV offset to preserve dynamic range. Use Value: 25 pA max input bias avoids saturation at high-gain (>109 Ω feedback), enabling detection of picoamp-level photocurrents. | Use Scenario: Driving analog output of 12-bit CMOS DACs (e.g., AD7545) in programmable power supplies and waveform generators. IC Role / Device Role / Timing Role: Precision I-to-V converter with 1.0 ms ±0.01% settling to match DAC update rates up to 1 MSPS. Use Value: Settling performance unlocks full DAC resolution without post-conversion waiting cycles or oversampling penalties. |
| Active Filter Stage | ADC Input Buffer |
Use Scenario: Second-order Butterworth low-pass filter (20 kHz cutoff) in anti-aliasing front-ends for data acquisition systems. IC Role / Device Role / Timing Role: High-GBW, low-distortion gain block maintaining amplitude flatness and phase linearity up to 100 kHz. Use Value: 3 MHz bandwidth and 0.0003% THD ensure minimal passband ripple and stopband feedthrough beyond 5 MHz. | Use Scenario: Unity-gain buffer preceding SAR ADCs (e.g., AD574) with dynamically switching input capacitance. IC Role / Device Role / Timing Role: Low-output-impedance driver recovering from transient loading within 1.2 µs after conversion start. Use Value: High open-loop gain (200 V/mV) and fast recovery suppress instantaneous errors caused by ADC input current spikes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OP27GP | Higher slew rate (8 V/µs), lower noise (3.5 nV/√Hz), but bipolar input (200 nA bias current) vs. AD711KNZ's JFET input (25 pA). | Better for low-noise voltage amplification; unsuitable for high-Z photodiode or electrometer use due to bias current. | Select OP27GP when voltage-source signals dominate and dc precision at high frequencies is prioritized over input impedance. |
| TL071CP | Lower cost, same JFET input, but 0.5 mV offset (vs. 0.25 mV), 13 V/µs slew rate, and no guaranteed 0.01% settling time spec. | Adequate for general-purpose audio and non-critical instrumentation; not recommended for 12-bit data converter interfaces. | Choose TL071CP only for cost-sensitive, non-precision applications where 12-bit linearity and sub-microsecond settling are not required. |
Compared with OP27GP and TL071CP, AD711KNZ uniquely balances JFET-input impedance, 12-bit dc accuracy, and verified 1.0 ms ±0.01% settling - making it the only option among the three qualified for photodiode preamps and DAC buffers demanding simultaneous low bias current and fast transient response.
Availability
AD711KNZ is available at Aetrix Electronics and suitable for industrial instrumentation, medical sensor interfaces, and automated test equipment requiring stable component supply and long-term obsolescence management.
Supply support for AD711KNZ 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.
The AD711 series was designed specifically for precision data acquisition systems requiring both high dc accuracy and fast settling - targeting DAC/ADC buffering, active filtering, and low-noise transimpedance applications across industrial and instrumentation markets.
FAQ
What is the operating temperature range for AD711KNZ?
The AD711KNZ is rated for the commercial temperature range of 0°C to +70°C, as indicated by the 'N' suffix in the part number and confirmed in the Analog Devices ordering guide. This grade uses plastic DIP packaging (N-8) and meets all electrical specifications within this ambient range when powered from ±15 V supplies. The AD711KNZ does not support extended industrial (–40°C to +85°C) or military temperature ranges.
Does AD711KNZ require external compensation for unity-gain stability?
No, AD711KNZ is internally compensated for unity-gain stability and drives ≥100 pF capacitive loads without oscillation. The datasheet confirms stable operation in unity-gain follower configurations with 100 pF load capacitance, eliminating need for external compensation networks. However, for loads exceeding 1500 pF, a 100 Ω isolation resistor in series with the output is recommended per Figure 13.
Can AD711KNZ be used with single-supply operation?
Yes, AD711KNZ operates from split supplies (±4.5 V to ±18 V) but can be configured for single-supply use with appropriate biasing. Its input common-mode range extends to –VS + 4 V and +VS – 2 V, allowing rail-to-rail input operation when VS = 0 V is used as reference. Output swing remains asymmetric (e.g., 0 V to +13 V with +15 V supply), requiring level-shifting for true rail-to-rail output.
What is the purpose of Pins 1 and 5 on AD711KNZ?
Pins 1 and 5 are offset null terminals used to minimize input offset voltage via an external 10 kΩ potentiometer. Pin 1 connects to one end of the pot, Pin 5 to the other end, and the wiper connects to –VS (Pin 4). This two-point nulling scheme reduces thermal drift contribution compared to single-pot configurations and is specified for use with ±15 V supplies per the AD711KNZ datasheet.
How does AD711KNZ compare to AD711JN in terms of performance?
AD711KNZ and AD711JN share identical 8-pin plastic DIP packaging and commercial temperature rating (0°C to +70°C), but differ in grading: AD711KNZ is K-grade (tighter specs - e.g., 0.5 mV max offset, 18 V/µs min slew rate), while AD711JN is J-grade (2 mV max offset, 16 V/µs min slew rate). Both meet AD711 family specifications, but AD711KNZ offers superior dc precision and dynamic performance for higher-resolution systems.
AD711KNZ 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:
- 1
- Output Type:
- -
- Slew Rate:
- 20V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 4 MHz
- Current - Input Bias:
- 15 pA
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 2.5mA
- 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
AD711KNZ FAQ
1.How can I place an order for AD711KNZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD711KNZ 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 AD711KNZ reliable?
The price and inventory of AD711KNZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD711KNZ is usually 5 days.
3.What payment methods are accepted for AD711KNZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD711KNZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD711KNZ?
AD711KNZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD711KNZ 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 AD711KNZ?
For technical support, including AD711KNZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD711KNZ requirements.
6.How does Aetrix verify that AD711KNZ is sourced from the original manufacturer or authorized distributors?
All AD711KNZ 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 AD711KNZ meets industry standards.
7.What is the process for return or replacement of AD711KNZ?
All AD711KNZ units undergo pre-shipment inspection (PSI). If there is an issue with AD711KNZ, 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 AD711KNZ part is unused and in its original packaging.
Return procedure for AD711KNZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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