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Analog Devices Inc. AD648KNZ
- Part No.:
- AD648KNZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AD648KNZ.pdf
- Description:
- IC OPAMP JFET 2 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,534
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Product details
Overview
AD648KNZ from Analog Devices is a dual precision, low-power BiFET operational amplifier in an 8-lead plastic mini-DIP (N) package, delivering 1 MHz unity-gain bandwidth, 1.8 V/µs slew rate, and ≤10 pA max input bias current (warmed up). It operates from ±4.5 V to ±18 V supplies, achieves ≤2 mV max input offset voltage (J-grade), and targets high-impedance, battery-powered instrumentation front ends and CMOS DAC buffers.
For engineers reviewing the AD648KNZ datasheet, AD648KNZ pinout, AD648KNZ application, or AD648KNZ equivalent, key selection criteria include guaranteed low warm-up bias current, laser-trimmed offset drift (≤20 µV/°C), crosstalk < –120 dB at 1 kHz, and compatibility with ±15 V precision signal conditioning systems requiring stable DC accuracy and sub-1% linearity.
Technical Context
The AD648KNZ integrates two matched JFET-input op amps on a single die using ion-implanted FET and laser wafer trimming. Its input stage maintains ≤10 pA bias current across the full common-mode range (±11 V), enabling accurate sensing in high-impedance transducer interfaces.
It features 82 dB min common-mode rejection (B-grade), 1000 V/mV open-loop gain (RL ≥ 10 kΩ), and 2 µV p-p 0.1 Hz–10 Hz input voltage noise-optimized for low-frequency precision applications where self-heating-induced drift must be minimized.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | ≤10 pA max (warmed up); enables >100 GΩ source impedance interfacing without significant error. |
| Input Offset Voltage | ≤2 mV max (J-grade); ensures ≤0.05% error in 4 V full-scale 12-bit DAC buffer applications. |
| Offset Voltage Drift | ≤20 µV/°C max (J-grade); limits thermal-induced output shift to <100 µV over 0°C–70°C operating range. |
| Unity-Gain Bandwidth | 1 MHz typical; supports stable closed-loop operation up to 100 kHz with 10× gain margin. |
| Slew Rate | 1.8 V/µs typical; allows 20 V step response settling to ±0.01% in ≤8 µs under light load. |
| Quiescent Current | 400 µA max (both amplifiers); draws only 6 mW from ±15 V supply-critical for portable instrumentation. |
| Crosstalk | < –120 dB at 1 kHz; prevents coupling between channels in dual-sensor signal chains. |
Pinout & Package
AD648KNZ is housed in an 8-lead plastic mini-DIP (N-8) package with standard dual op amp pinout and 0.3-inch body width. Pin 1 identifies channel A non-inverting input; pins are spaced 0.1 inch (2.54 mm) apart with 0.3 inch row spacing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Channel A Non-Inverting Input (+) | High-impedance JFET input node; requires guarding for leakage-sensitive photodiode preamp use. |
| 2 | Channel A Inverting Input (–) | Virtual ground node in inverting configurations; connects to feedback network for gain setting. |
| 3 | Channel A Output | Capable of sourcing/sinking ±12 V into ≥10 kΩ load; limited to ±11 V into 5 kΩ. |
| 4 | Negative Supply (–VS) | Common return for both amplifiers; must be decoupled with ≥0.1 µF ceramic capacitor near pin. |
| 5 | Channel B Inverting Input (–) | Independent summing node; crosstalk to Channel A is < –120 dB at 1 kHz. |
| 6 | Channel B Non-Inverting Input (+) | Matched to Pin 1; offset voltage matching ≤2 mV (AD648J grade) enables precision differential circuits. |
| 7 | Channel B Output | Electrically isolated from Channel A output; supports independent gain/feedback networks. |
| 8 | Positive Supply (+VS) | Accepts ±4.5 V to ±18 V; PSRR ≥76 dB ensures minimal supply ripple coupling to output. |
Key Features
| Feature | Design Value |
|---|---|
| Laser wafer drift trimming | Guarantees ≤20 µV/°C offset drift (J-grade), reducing calibration frequency in field-deployed sensors. |
| Matched dual architecture | Input offset voltage matching ≤2 mV (AD648J) enables high-CMRR instrumentation amplifier topologies with <0.01% gain nonlinearity. |
| Low 1/f noise | 2 µV p-p (0.1 Hz–10 Hz) minimizes baseline wander in ECG and strain gauge front ends. |
| Guaranteed bias current over full common-mode range | ≤30 pA max across ±11 V CMVR ensures consistent transimpedance gain in photodiode preamps regardless of input common-mode level. |
| ESD-protected inputs | Withstands ±4000 V HBM per JEDEC 22-A114; reduces need for external protection in lab-grade test equipment. |
Applications
| Battery-Powered Precision Instrumentation | CMOS DAC Bipolar Output Buffer |
|---|---|
Use Scenario: Portable pH meter or handheld multimeter measuring microvolt-level sensor outputs with 12-bit resolution. IC Role / Device Role / Timing Role: Dual-channel front-end amplifier conditioning differential electrode signals while rejecting common-mode noise from battery switching. Use Value: 400 µA total quiescent current extends battery life beyond 100 hours; ≤2 mV offset ensures <0.05% full-scale error without auto-zero circuitry. | Use Scenario: Industrial PLC analog output module converting 12-bit sign-magnitude digital codes to ±10 V bipolar voltage. IC Role / Device Role / Timing Role: Output buffer for AD7545 CMOS DAC, providing level-shifting, current-to-voltage conversion, and rail-to-rail drive capability. Use Value: ≤10 pA bias current prevents DAC ladder code-dependent gain errors; 1.8 V/µs slew rate supports 100 kHz update rates with <0.01% settling. |
| Dual Photodiode Preamp | Low-Power Instrumentation Amplifier Core |
Use Scenario: UV/visible spectrophotometer measuring absorbance via two matched photodiodes in ratio mode. IC Role / Device Role / Timing Role: Transimpedance amplifier for each photodiode, with matched gain paths enabling ratiometric cancellation of lamp intensity drift. Use Value: ≤10 pA bias current avoids dark-current-induced offset; –120 dB crosstalk prevents optical channel bleed-through at 1 kHz modulation frequencies. | Use Scenario: Medical patient monitor acquiring biopotential signals (ECG, EMG) from dry electrodes with >100 MΩ source impedance. IC Role / Device Role / Timing Role: First-stage amplifier in 3-op-amp IA topology, providing high-Z input, gain control via RG, and common-mode rejection. Use Value: >1 × 10¹² Ω common-mode impedance preserves signal integrity; 82 dB CMRR (B-grade) rejects 50/60 Hz mains interference without active filtering. |
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 |
|---|---|---|---|
| TL062CDR | Higher 30 pA max bias current; 0.35 mV max offset; no laser drift trimming (50 µV/°C max). | Lower-cost general-purpose use; unsuitable for <100 GΩ sources or 0.01% linearity requirements. | Select TL062CDR only when budget constraints outweigh precision needs and source impedance is <10 MΩ. |
| OP270GP | Lower 25 µV max offset and 0.6 µV/°C drift, but 1.2 mA quiescent current per amplifier (3× AD648KNZ). | High-accuracy lab equipment where power is not constrained; incompatible with battery operation. | Choose OP270GP for benchtop calibrators needing sub-10 µV offset, but avoid in portable designs due to 2.4 mA total supply current. |
Compared with TL062CDR and OP270GP, AD648KNZ uniquely balances ultra-low bias current (≤10 pA), low drift (≤20 µV/°C), and micropower operation (400 µA)-making it irreplaceable in battery-powered, high-impedance sensor interfaces where all three parameters are simultaneously critical.
Availability
AD648KNZ is available at Aetrix Electronics and suitable for battery-powered instrumentation, CMOS DAC buffering, photodiode preamplification, and low-power instrumentation amplifier designs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD648KNZ 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, founded in 1965 and headquartered in Wilmington, MA.
The AD648 product line was designed for precision, low-power dual op amp applications in portable test equipment, sensor signal chains, and industrial DAC interfaces-emphasizing laser-trimmed DC accuracy and JFET input integrity.
FAQ
What is the maximum operating temperature range for AD648KNZ?
AD648KNZ is rated for the commercial temperature range of 0°C to +70°C. This grade is specified for stable operation within that range, with guaranteed parameters including ≤2 mV input offset voltage and ≤20 µV/°C drift. It is not qualified for industrial (–40°C to +85°C) or military temperature ranges-those require AD648A/B or AD648S/T variants respectively. The AD648KNZ datasheet confirms this rating under "Temperature Range" in the specifications table.
Does AD648KNZ support single-supply operation?
AD648KNZ is specified for dual-supply operation (±4.5 V to ±18 V) and is not characterized for true single-supply use. While it can function with asymmetric supplies (e.g., +15 V and ground), its input common-mode range extends only to within ~1 V of the positive rail and ~3 V above the negative rail-so with a 0 V/15 V supply, usable input range is limited to ~3 V–14 V. For dedicated single-supply applications, consider purpose-built rail-to-rail op amps instead of relying on AD648KNZ outside its validated dual-supply operating conditions.
What is the input protection scheme for AD648KNZ?
AD648KNZ includes internal ESD protection diodes rated for ±4000 V HBM, but no input clamping beyond substrate junction limits. The datasheet explicitly warns that exceeding the negative supply voltage on either input forward-biases the substrate junction and may cause permanent damage. Therefore, external protection-such as series current-limiting resistors (e.g., 100 kΩ for ≤1 mA fault current) or low-leakage diode clamps referenced to rails-is required in fault-prone applications like flame detectors or industrial I/O. This is documented in the "INPUT PROTECTION" section of the AD648 datasheet Rev. E.
How does AD648KNZ compare to AD648JR in terms of package and performance?
AD648KNZ and AD648JR share identical electrical specifications-including ≤2 mV offset, ≤20 µV/°C drift, and ≤10 pA bias current-as both are J-grade devices. Their only difference is packaging: AD648KNZ uses an 8-lead plastic mini-DIP (N-8) with through-hole mounting, while AD648JR uses an 8-lead SOIC (R-8) for surface-mount assembly. Thermal resistance differs (θJA = 165°C/W for N-8 vs. 160°C/W for R-8), but DC/AC performance is fully interchangeable. Pinout and footprint are not compatible between the two packages.
Is AD648KNZ suitable for driving capacitive loads like piezoelectric sensors?
AD648KNZ is characterized to cleanly drive up to 100 pF in parallel with a 10 kΩ load, as stated in the "APPLICATION NOTES" section. Driving larger capacitive loads (>100 pF) without isolation resistance risks instability and peaking due to phase margin degradation. For direct piezoelectric sensor interfacing-which often presents >1 nF capacitance-a series resistor (e.g., 100 Ω–1 kΩ) between the AD648KNZ output and the capacitor is mandatory to maintain stability. The datasheet's Figure 24 and related text confirm this limitation and recommend RC isolation for reactive loads.
AD648KNZ 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:
- 1.8V/µs
- Gain Bandwidth Product:
- 1 MHz
- -3db Bandwidth:
- 1 MHz
- Current - Input Bias:
- 3 pA
- Voltage - Input Offset:
- 300 µV
- Current - Supply:
- 340µA (x2 Channels)
- 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
AD648KNZ FAQ
1.How can I place an order for AD648KNZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD648KNZ 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 AD648KNZ reliable?
The price and inventory of AD648KNZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD648KNZ is usually 5 days.
3.What payment methods are accepted for AD648KNZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD648KNZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD648KNZ?
AD648KNZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD648KNZ 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 AD648KNZ?
For technical support, including AD648KNZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD648KNZ requirements.
6.How does Aetrix verify that AD648KNZ is sourced from the original manufacturer or authorized distributors?
All AD648KNZ 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 AD648KNZ meets industry standards.
7.What is the process for return or replacement of AD648KNZ?
All AD648KNZ units undergo pre-shipment inspection (PSI). If there is an issue with AD648KNZ, 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 AD648KNZ part is unused and in its original packaging.
Return procedure for AD648KNZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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