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Analog Devices Inc. AD843KNZ
- Part No.:
- AD843KNZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AD843KNZ.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:163
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Product details
Overview
AD843KNZ from Analog Devices is a high-speed, CBFET-input operational amplifier designed for precision signal conditioning in demanding analog systems. It delivers 34 MHz unity-gain bandwidth, 250 V/µs slew rate, and 135 ns settling time to 0.01% for a 10 V step - enabling accurate buffering of 12-bit DAC/ADC outputs and fast sample-and-hold circuits.
For engineers reviewing the AD843KNZ datasheet, AD843KNZ pinout, AD843KNZ application, or AD843KNZ equivalent, key selection criteria include its FET-input low bias current (0.6 nA typ), stability at unity gain without external compensation, and compatibility with ±15 V supplies in industrial temperature range (–40°C to +85°C).
Technical Context
The AD843KNZ uses Analog Devices' junction-isolated complementary bipolar (CB) process, combining FET-input DC precision with wideband AC performance. Its CBFET input stage achieves 0.6 nA typical input bias current while sustaining 34 MHz bandwidth and 250 V/µs slew rate - a monolithic integration previously unattainable.
It operates stably at closed-loop gains ≥1 without external compensation across –40°C to +85°C, supports ±15 V supply (±4.5 V to ±18 V operating range), and features offset null pins for precision trimming - critical for high-speed integrators and active filters requiring minimal drift and overshoot.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Unity Gain Bandwidth | 34 MHz - enables stable amplification up to 34 MHz at gain = 1, suitable for video and RF signal paths. |
| Settling Time (0.01%) | 135 ns for 10 V step - ensures accurate capture in 12-bit data acquisition systems with ≤1 µs cycle times. |
| Slew Rate | 250 V/µs - prevents distortion on fast-rising signals such as pulse trains and digital-to-analog transitions. |
| Input Bias Current | 0.6 nA typical - minimizes voltage error in high-impedance sensor interfaces and integrator feedback networks. |
| Input Offset Voltage | 1 mV max (K-grade) - reduces static error in precision gain stages and active filter DC response. |
| Supply Voltage Range | ±4.5 V to ±18 V - supports operation from dual ±5 V logic-compatible rails up to ±15 V industrial standards. |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments including motor control and test equipment. |
Pinout & Package
The AD843KNZ is supplied in an 8-pin plastic Mini-DIP (N-8) package with standard dual-in-line pin spacing and through-hole mounting. Pin 1 is identified by a notch or dot; the package is RoHS-compliant and rated for 1.50 W internal power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Null | Connects to potentiometer wiper for manual input offset adjustment; required only in ultra-precision applications. |
| 2 | Inverting Input (–) | Differential input node; accepts feedback network for inverting configurations and active filter topologies. |
| 3 | Noninverting Input (+) | Differential input node; used in noninverting buffers, instrumentation front-ends, and S/H hold amplifiers. |
| 4 | V– | Negative supply rail connection; must be bypassed with 0.1 µF ceramic + 2.2 µF tantalum near pin. |
| 5 | Offset Null | Second terminal of offset trim network; completes 3-terminal nulling circuit with Pin 1 and ground. |
| 6 | Output | Capable of sourcing/sinking ≥50 mA into 500 Ω loads; drives capacitive loads up to 20 pF directly. |
| 7 | V+ | Positive supply rail connection; requires same bypassing as Pin 4 to maintain high-frequency PSRR. |
| 8 | NC | No internal connection; left unconnected per datasheet - not used for thermal or shielding purposes. |
Key Features
| Feature | Design Value |
|---|---|
| FET-input architecture with CBFET process | Delivers 0.6 nA input bias current while maintaining 34 MHz bandwidth - eliminates trade-off between speed and input impedance. |
| Unity-gain stable without external compensation | Reduces BOM count and layout complexity in buffer and gain-of-one configurations; eliminates risk of oscillation in production. |
| Laser wafer-trimmed input offset | Guarantees ≤1 mV max offset (K-grade), enabling direct use in 12-bit systems without calibration overhead. |
| High output drive capability | 50 mA min output current supports driving 500 Ω loads and small capacitive networks - avoids need for external driver stages. |
| Industrial temperature qualification | Rated from –40°C to +85°C with full parameter guarantees - suitable for embedded controllers and factory automation hardware. |
Applications
| High-Speed Sample-and-Hold Amplifiers | High-Bandwidth Active Filters |
|---|---|
Use Scenario: Capturing transient waveforms in automated test equipment with 12-bit resolution and sub-microsecond acquisition cycles. IC Role / Device Role / Timing Role: Acts as the hold amplifier and buffer in a ping-pong S/H architecture, leveraging 135 ns settling and 250 V/µs slew rate to minimize aperture error. Use Value: Enables ≤1 µs total acquisition time while maintaining 0.01% fidelity - critical for digitizing fast pulses and modulated RF envelopes. | Use Scenario: Implementing 4th-order Butterworth low-pass filtering in medical ultrasound receive chains operating up to 5 MHz. IC Role / Device Role / Timing Role: Configured as dual-stage MFB topology op amp; provides phase-linear response and minimal group delay variation across passband. Use Value: Achieves <0.025% differential gain/phase error at 4.4 MHz - preserves image contrast and spatial resolution in real-time B-mode imaging. |
| High-Speed Integrators | High-Frequency Signal Conditioning |
Use Scenario: Precision analog computing in aerospace inertial navigation systems requiring nanosecond-scale reset and linear ramp generation. IC Role / Device Role / Timing Role: Functions as the core integrator in a switched-capacitor configuration, using low input bias current to minimize integration drift. Use Value: 0.6 nA input bias current limits voltage error to <1 µV/s in 1 nF integrator - extends usable integration window beyond 10 ms. | Use Scenario: Level-shifting and buffering of TTL/CMOS logic edges before high-speed ADC sampling in digital oscilloscopes. IC Role / Device Role / Timing Role: Used as a unity-gain buffer with compensated feedback to drive 50 Ω transmission lines and reduce edge jitter. Use Value: 10 ns rise time and <15% overshoot ensure clean 3.3 V logic transitions at >20 MSPS sampling rates - prevents timing skew in multi-channel capture. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed FET-input op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA600ID | Higher 400 V/µs slew rate but lower 20 MHz bandwidth; 1.5 nA input bias current; no offset null pins. | Better for pulse amplification where speed dominates accuracy; less suitable for precision integrators or low-drift S/H hold stages. | Select OPA600ID when >200 V/µs is mandatory and 0.6 nA bias current is not required. |
| AD847ARZ | Lower 50 MHz bandwidth but 10× faster 50 ns settling (to 0.1%); 20 nA input bias; single-supply capable (±4.5 V to ±18 V). | Preferred for general-purpose high-speed buffering where unity-gain stability and ultra-low bias are secondary to raw speed. | Choose AD847ARZ for cost-sensitive designs needing faster settling than AD843KNZ but tolerating higher input current. |
Compared with OPA600ID and AD847ARZ, the AD843KNZ uniquely balances 34 MHz bandwidth, 0.6 nA input bias, and guaranteed 135 ns settling in an industrial-grade DIP package - making it optimal for precision high-speed analog signal chains where both speed and DC accuracy are simultaneously critical.
Availability
AD843KNZ is available at Aetrix Electronics and suitable for high-speed sample-and-hold amplifiers, industrial active filters, and precision integrator circuits requiring stable component supply across extended temperature ranges.
Supply support for AD843KNZ 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 AD843KNZ belongs to Analog Devices' wideband operational amplifier product line, engineered specifically for applications demanding simultaneous high speed, low input bias, and industrial temperature reliability - such as test instrumentation, medical imaging, and avionics signal conditioning.
FAQ
What is the maximum capacitive load the AD843KNZ can drive without compensation?
The AD843KNZ can drive up to 20 pF directly without external compensation while maintaining specified settling and overshoot performance. For loads exceeding 20 pF - such as PCB traces or ADC input capacitance - a 5 pF feedback capacitor is recommended in unity-gain inverter configurations, and a series 10 Ω resistor with 15–47 pF feedback capacitor is advised for loads >100 pF. These configurations preserve stability and reduce ringing, as verified in AD843KNZ application circuits Figures 20–23.
Does the AD843KNZ require external compensation for unity-gain operation?
No, the AD843KNZ is unity-gain stable and does not require external compensation across its full operating temperature range (–40°C to +85°C). This is confirmed in the product highlights and specifications table, which explicitly states "Stable at Gains of 1 or Greater" and "does not require external compensation at closed loop gains of 1 or greater." The internal compensation ensures robust performance in buffer and gain-of-one configurations without added components.
What is the input offset voltage specification for the AD843KNZ?
The AD843KNZ has a maximum input offset voltage of 1 mV at +25°C, with a typical value of 0.5 mV. Over the full industrial temperature range (–40°C to +85°C), the max offset is 2.0 mV. This specification is laser wafer-trimmed and guaranteed for the K-grade device, enabling direct use in 12-bit data acquisition systems without post-calibration in most cases.
Can the AD843KNZ operate from ±5 V supplies?
Yes, the AD843KNZ supports supply voltages from ±4.5 V to ±18 V, making ±5 V operation fully valid. At ±5 V, quiescent current remains within 12–13 mA, output swing is reduced to approximately ±3.5 V (typical), and full-power bandwidth decreases proportionally - but unity-gain stability, slew rate, and settling time remain functional. Designers should verify output headroom and noise performance for their specific ±5 V application.
Is the AD843KNZ pin-compatible with other AD843 variants like AD843JN or AD843BQ?
No, the AD843KNZ (8-pin plastic DIP, N-8 package) is not pin-compatible with AD843BQ (8-pin Cerdip, Q-8) or AD843JN (same N-8 package but different temp grade). While all share identical pin functions and numbering, the AD843KNZ and AD843JN are mechanically identical and pin-compatible; AD843BQ shares pinout but differs in thermal resistance, hermetic sealing, and lead finish - requiring layout verification for thermal and reliability compliance. Always consult mechanical drawings before substitution.
AD843KNZ 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:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 250V/µs
- Gain Bandwidth Product:
- 34 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 40 pA
- Voltage - Input Offset:
- 500 µV
- Current - Supply:
- 12mA
- Current - Output / Channel:
- 50 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
AD843KNZ FAQ
1.How can I place an order for AD843KNZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD843KNZ 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 AD843KNZ reliable?
The price and inventory of AD843KNZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD843KNZ is usually 5 days.
3.What payment methods are accepted for AD843KNZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD843KNZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD843KNZ?
AD843KNZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD843KNZ 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 AD843KNZ?
For technical support, including AD843KNZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD843KNZ requirements.
6.How does Aetrix verify that AD843KNZ is sourced from the original manufacturer or authorized distributors?
All AD843KNZ 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 AD843KNZ meets industry standards.
7.What is the process for return or replacement of AD843KNZ?
All AD843KNZ units undergo pre-shipment inspection (PSI). If there is an issue with AD843KNZ, 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 AD843KNZ part is unused and in its original packaging.
Return procedure for AD843KNZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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