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Analog Devices Inc. AD548KNZ
- Part No.:
- AD548KNZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AD548KNZ.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:102
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Product details
Overview
AD548KNZ from Analog Devices is a precision, low-power BiFET operational amplifier in an 8-lead plastic mini-DIP (N) package. It delivers 1 MHz unity-gain bandwidth, 1.8 V/µs slew rate, and ≤2 mV input offset voltage (J/K grade), with 200 µA max quiescent current and 10 pA max warmed-up input bias current - ideal for battery-powered instrumentation front ends and CMOS DAC output buffering.
For engineers reviewing the AD548KNZ datasheet, AD548KNZ pinout, AD548KNZ application, or AD548KNZ equivalent, key selection considerations include its guaranteed low drift (20 µV/°C max), laser-trimmed dc precision, JFET-input impedance >1 TΩ, and compatibility with ±4.5 V to ±18 V dual supplies in high-impedance sensor signal conditioning.
Technical Context
The AD548KNZ employs ion-implanted FET input stages and laser wafer trimming to achieve stable dc performance across temperature. Its input bias current remains ≤10 pA (warmed up) over the full common-mode range (±11 V), and open-loop gain exceeds 300 V/mV at ±12 V output swing into ≥10 kΩ load.
Designed for dual-supply operation, it features rail-to-rail input common-mode range (–11 V to +12 V), 82 dB min CMRR (B grade), and 76 dB PSRR - enabling 12-bit linearity in high-Z buffer applications without external trimming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | ≤2.0 mV max (AD548K grade); ensures ≤0.05% error in 12-bit DAC buffer at 10 V full scale |
| Input Bias Current | ≤10 pA max (warmed up); enables <0.1% error with 100 MΩ source impedance |
| Quiescent Current | ≤200 µA max; supports >1-year battery life in portable 3 V/5 V systems |
| Unity-Gain Bandwidth | 1.0 MHz typical; sufficient for 12-bit settling in <10 µs with 10 kΩ//100 pF load |
| Slew Rate | 1.8 V/µs typical; supports 20 V step response within ±0.01% in 14 µs |
| Input Voltage Noise | 2 µV p-p (0.1–10 Hz); critical for low-frequency photodiode preamp accuracy |
| Common-Mode Rejection | 82 dB min (AD548B); maintains >12-bit linearity with ±1 V common-mode shift |
Pinout & Package
AD548KNZ is housed in an 8-lead plastic mini-DIP (N-8) package with standard op amp pinout and case-connected Pin 4. The package meets JEDEC MS-012 AA and supports through-hole mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Null (–) | Connects to potentiometer wiper for manual input offset adjustment; nulling adds ~0.24 µV/°C drift per 100 µV nulled |
| 2 | Inverting Input (–) | High-impedance FET node; bias current ≤10 pA enables ultra-low-leakage transducer interfacing |
| 3 | Noninverting Input (+) | Differential input terminal; common-mode range extends to ±12 V with ±15 V supplies |
| 4 | V– (Negative Supply) | Connected internally to case; must be tied to system ground or negative rail - not left floating |
| 5 | Offset Null (+) | Second null terminal; used with Pin 1 to balance input stage mismatch |
| 6 | Output | Capable of ±12 V swing into 10 kΩ; drives 100 pF capacitive loads without instability |
| 7 | V+ (Positive Supply) | Accepts +4.5 V to +18 V; PSRR ≥76 dB minimizes supply-induced offset errors |
| 8 | No Connect (NC) | Internally unconnected; must remain open - no external tie required |
Key Features
| Feature | Design Value |
|---|---|
| Laser wafer drift trimming | Guarantees ≤2 mV offset and ≤20 µV/°C drift without external trim components |
| FET input stage | Delivers >1 TΩ input impedance and ≤10 pA bias current for high-Z sensor interfaces |
| Low self-heating error | 200 µA quiescent current minimizes thermal drift - critical for on/off battery operation |
| Wide supply range | Operates from ±4.5 V to ±18 V; maintains specs across industrial temperature range (–40°C to +85°C) |
| Enhanced LF441/TL061 replacement | Pin-compatible upgrade delivering 85% lower power with improved offset and noise performance |
Applications
| Photodiode Preamplifier | CMOS DAC Output Buffer |
|---|---|
Use Scenario: Amplifying low-current signals from 0.2 mm² photodiodes in gas chromatography flame detectors. IC Role / Device Role / Timing Role: Transimpedance amplifier converting photocurrent to voltage with minimal input error. Use Value: 10 pA max bias current limits error to <30 µV at 100 MΩ feedback; 2 µV p-p 0.1–10 Hz noise preserves SNR in low-light detection. | Use Scenario: Driving AD7545 12-bit CMOS DAC outputs in portable data acquisition systems. IC Role / Device Role / Timing Role: Precision output amplifier setting full-scale voltage and compensating DAC ladder nonlinearity. Use Value: ≤2 mV offset ensures <0.05% full-scale error; 1.8 V/µs slew rate achieves ±0.01% settling in 14 µs for 20 V steps. |
| Low-Power Instrumentation Amp | Log Ratio Signal Conditioner |
Use Scenario: Building 3-op-amp instrumentation amplifiers for thermocouple or strain gauge readouts in field instruments. IC Role / Device Role / Timing Role: High-Z input stage providing gain-setting and common-mode rejection before output buffering. Use Value: >1 TΩ input impedance prevents loading of high-resistance sensors; 82 dB CMRR maintains accuracy with ±1 V ground shifts. | Use Scenario: Linearizing exponential outputs from RTDs or compressing wide-dynamic-range analog signals in medical sensors. IC Role / Device Role / Timing Role: Front-end amplifier in log ratio circuit using matched transistor pair (Q1/Q2) for I₁/I₂ ratio computation. Use Value: ≤10 pA bias current ensures <1% conformance error down to 300 pA input; low drift preserves calibration over temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL061CP | Higher 30 pA max bias current; 3 mV max offset; 0.4 V/µs slew rate; no laser trimming | Lower-cost general-purpose use; unsuitable for sub-mV offset or <100 pA leakage-critical designs | Select TL061CP only when budget constraints outweigh precision and low-power requirements |
| LF441CN | 15 pA max bias current; 5 mV max offset; 1.5 V/µs slew rate; no guaranteed warm-up spec | Legacy replacement where moderate drift tolerance exists; lacks AD548KNZ's 20 µV/°C guarantee | Choose LF441CN only if existing designs require footprint compatibility without performance upgrade |
Compared with TL061CP and LF441CN, AD548KNZ provides superior dc precision (2× lower offset, 3× lower bias current), 4.5× higher slew rate, and verified warm-up stability - making it the preferred choice for battery-powered instrumentation requiring long-term calibration integrity.
Availability
AD548KNZ is available at Aetrix Electronics and suitable for photodiode preamplification, CMOS DAC buffering, and low-power instrumentation amplifier designs requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for AD548KNZ 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, serving industrial, communications, automotive, and healthcare markets since 1965.
The AD548KNZ belongs to Analog Devices' precision BiFET op amp product line, engineered specifically for low-power, high-impedance signal conditioning in battery-operated test equipment, sensor interfaces, and portable instrumentation.
FAQ
What is the operating temperature range for AD548KNZ?
The AD548KNZ is rated for the commercial temperature range of 0°C to +70°C. This grade (K) is distinct from the industrial-grade AD548B (–40°C to +85°C) and military-grade AD548S (–55°C to +125°C). All electrical specifications in the datasheet for AD548KNZ are guaranteed within this 0°C to +70°C range, including input offset voltage ≤2.0 mV and bias current ≤10 pA after warm-up.
Does AD548KNZ require external offset nulling in most applications?
No - AD548KNZ does not require external offset nulling in most applications. Its laser-trimmed input stage guarantees ≤2.0 mV initial offset voltage, and its low 20 µV/°C drift eliminates the need for manual trimming in stable environments. While Pins 1 and 5 support nulling, doing so introduces additional drift (~0.24 µV/°C per 100 µV nulled), so Analog Devices recommends relying on the factory-trimmed performance of AD548KNZ unless sub-millivolt residual offset is mandatory.
Can AD548KNZ drive capacitive loads such as ADC input sampling capacitors?
Yes - AD548KNZ can reliably drive moderate capacitive loads. It is characterized to drive up to 100 pF with resistive loads ≥10 kΩ without instability, as confirmed in typical performance curves (TPC 14, TPC 15). For larger capacitive loads (>100 pF), a series isolation resistor (e.g., 100 Ω) between AD548KNZ output and the capacitor is recommended to maintain phase margin. The device's 1.8 V/µs slew rate supports fast settling into sampling capacitors in multiplexed data acquisition systems.
Is AD548KNZ pin-compatible with industry-standard op amps?
Yes - AD548KNZ uses the standard 8-pin DIP op amp pinout and is explicitly documented as pin-compatible with LF441, TL061, and AD542. This allows direct drop-in replacement in existing designs, delivering immediate improvements in power (≤200 µA vs. ~1.5 mA for TL061), offset (≤2 mV vs. ≤5 mV), and noise (2 µV p-p vs. ~5 µV p-p) without PCB changes. Pin compatibility is validated across all three grades (J/K/B) and package types (N, R).
What is the maximum supply voltage rating for AD548KNZ?
The absolute maximum supply voltage for AD548KNZ is ±18 V, with rated performance specified from ±4.5 V to ±15 V. Operation at ±18 V is permissible but may increase input offset voltage and reduce long-term reliability. The device's PSRR of ≥76 dB ensures stable operation across this range, and internal protection circuitry guards against transient overvoltage. For optimal dc precision and thermal stability, Analog Devices recommends operating AD548KNZ at ±15 V, where all key parameters (offset, drift, noise) are fully characterized.
AD548KNZ 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:
- 1.8V/µs
- Gain Bandwidth Product:
- 1 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 30 pA
- Voltage - Input Offset:
- 300 µV
- Current - Supply:
- 170µA
- Current - Output / Channel:
- 15 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
AD548KNZ FAQ
1.How can I place an order for AD548KNZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD548KNZ 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 AD548KNZ reliable?
The price and inventory of AD548KNZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD548KNZ is usually 5 days.
3.What payment methods are accepted for AD548KNZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD548KNZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD548KNZ?
AD548KNZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD548KNZ 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 AD548KNZ?
For technical support, including AD548KNZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD548KNZ requirements.
6.How does Aetrix verify that AD548KNZ is sourced from the original manufacturer or authorized distributors?
All AD548KNZ 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 AD548KNZ meets industry standards.
7.What is the process for return or replacement of AD548KNZ?
All AD548KNZ units undergo pre-shipment inspection (PSI). If there is an issue with AD548KNZ, 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 AD548KNZ part is unused and in its original packaging.
Return procedure for AD548KNZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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