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Analog Devices Inc. AD744KNZ
- Part No.:
- AD744KNZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AD744KNZ.pdf
- Description:
- IC OPAMP JFET 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,644
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Product details
Overview
AD744KNZ from Analog Devices is a precision, FET-input, monolithic operational amplifier optimized for high-speed, low-distortion buffering in data conversion systems. It delivers 500 ns settling to 0.01%, 75 V/µs slew rate, 13 MHz gain bandwidth (internally compensated), and 0.0003% THD at 1 kHz - enabling use as an output buffer for 12-bit to 16-bit DACs and ADCs in industrial instrumentation and audio signal chains.
For engineers reviewing the AD744KNZ datasheet, AD744KNZ pinout, AD744KNZ application, or AD744KNZ equivalent, key selection criteria include its verified 500 ns settling performance, ±15 V supply operation, TO-99-compatible 8-lead PDIP (N-8) package, and external decompensation capability for >200 MHz GBW at G ≥ 1000 - critical for DSP front-end preamplifiers and active filter design.
Technical Context
The AD744KNZ features a single-pole dominant-pole compensation architecture enabling fast, monotonic settling without overshoot. Its BiFET input stage provides 3 × 10¹² Ω||5.5 pF input impedance and sub-100 pA bias current at +25°C, supporting high-impedance sensor interfaces and precision I-to-V conversion.
Internal compensation ensures stability at unity-gain inverter (G = –1) or noninverting gain ≥ 2 configurations; external capacitor between Pins 5 and 8 enables stable unity-gain follower operation and drive of up to 1000 pF capacitive loads with 10 V/µs slew rate - validated per Figure 32 and Table II in Rev. D datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Settling Time (0.01%) | 500 ns typical at G = –1, RL = 2 kΩ, CL = 10 pF - enables <500 ns system-level settling for 12–16-bit DAC output buffering. |
| Slew Rate | 75 V/µs minimum (AD744K grade) - supports full-scale 10 V step response within 133 ns, critical for wideband pulse amplification. |
| Gain Bandwidth Product | 13 MHz (G = –1, internally compensated) - provides stable unity-gain inverter operation with phase margin >60° per Figure 10. |
| Total Harmonic Distortion | 0.0003% at f = 1 kHz, VO = 3 Vrms - meets THD requirements for 16-bit audio and measurement-grade signal conditioning. |
| Input Offset Voltage | 0.5 mV max (AD744K grade, TMIN to TMAX) - ensures ≤0.5 LSB error when buffering 12-bit DACs with 10 V full scale. |
| Capacitive Load Drive | 1000 pF maximum with external compensation (CCOMP = 20 pF) - allows direct interface to long cables or ADC input capacitance without added isolation stages. |
| Supply Voltage Range | ±4.5 V to ±18 V - supports operation from split-rail industrial supplies (±12 V, ±15 V) and accommodates transient overvoltage margins. |
Pinout & Package
AD744KNZ is supplied in an 8-lead plastic dual-in-line package (PDIP, N-8) per JEDEC MS-012-AA, with 0.300″ wide body, 0.100″ lead pitch, and through-hole mounting. Pin 1 is identified by a notch or dot; leads are numbered counterclockwise from top-left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Null (–) | Connects to internal JFET bias network; used with Pin 5 for laser-trimmed offset nulling per Figure 21. |
| 2 | Inverting Input (–IN) | High-impedance FET input node; accepts differential signals up to ±20 V; common-mode range ±11.5 V. |
| 3 | Noninverting Input (+IN) | High-impedance FET input node; matched to Pin 2 for CMRR >82 dB; input capacitance 5.5 pF. |
| 4 | –VS | Negative supply rail connection; requires 0.1 µF ceramic + 1 µF electrolytic bypass per Figure 24. |
| 5 | Offset Null (+) | Paired with Pin 1 for external null adjustment; also serves as compensation node when CCOMP is connected to Pin 8. |
| 6 | Output | Capable of sourcing/sinking 25 mA; drives 2 kΩ load to ±12.5 V min; stable into 1000 pF with external CCOMP. |
| 7 | +VS | Positive supply rail connection; same bypassing requirement as Pin 4; supports rail-to-rail input common-mode swing. |
| 8 | Compensation | Internal compensation node; connect external capacitor (5–25 pF) to Pin 5 for unity-gain follower or capacitive load drive. |
Key Features
| Feature | Design Value |
|---|---|
| FET-input architecture | 3 × 10¹² Ω input resistance and 30 pA bias current enable high-Z sensor interfacing without loading errors. |
| Single-pole settling response | Monotonic 500 ns 0.01% settling eliminates post-settling correction algorithms in DAC/ADC timing-critical paths. |
| External decompensation support | Pin 5–8 capacitor connection extends gain bandwidth to >200 MHz at G = 1000 (Figure 33, Table III), enabling RF front-end gain stages. |
| Laser wafer drift trimming | Guarantees 0.5 mV max offset voltage and 10 µV/°C max drift across –40°C to +85°C, reducing calibration overhead. |
| 100% tested dynamic parameters | Slew rate, settling time, and THD are 100% production-tested per Rev. D datasheet - no sampling-based qualification assumptions. |
Applications
| ADC Buffering | DAC Output Buffering |
|---|---|
|
Use Scenario: High-resolution data acquisition system digitizing analog sensor outputs with 14-bit SAR ADCs requiring minimal aperture uncertainty. IC Role / Device Role / Timing Role: Drives ADC input with low distortion and fast settling to preserve effective number of bits (ENOB) during track-and-hold acquisition window. Use Value: 500 ns settling ensures full 14-bit accuracy even at 1 MSPS sampling rates; 0.0003% THD prevents harmonic folding into baseband. |
Use Scenario: Precision waveform generator using 16-bit multiplying DAC (e.g., AD565A) to produce calibrated test signals for metrology equipment. IC Role / Device Role / Timing Role: Converts DAC current output to low-impedance voltage while maintaining sub-LSB linearity and minimizing glitch energy. Use Value: Verified 500 ns settling to 0.01% matches AD565A's 250 ns current-switching speed, achieving <500 ns total system settling per Figure 35. |
| Active Filter Stage | Wideband Preamplifier |
|
Use Scenario: 12-bit data acquisition system implementing anti-aliasing or reconstruction filters with sharp roll-off and linear phase. IC Role / Device Role / Timing Role: Forms second-order Sallen-Key or MFB topology with precise pole placement enabled by high open-loop gain (>250 V/mV). Use Value: 13 MHz GBW supports filter cutoffs up to 1 MHz with <0.1 dB passband ripple; low THD avoids intermodulation distortion in multi-tone inputs. |
Use Scenario: Digital signal processing front end capturing wideband RF or ultrasound signals before ADC sampling. IC Role / Device Role / Timing Role: Provides programmable gain (G = 10–1000) with decompensated bandwidth >200 MHz for baseband signal conditioning. Use Value: External decompensation (Pins 1–5) enables 225 MHz GBW at G = 1000 (Table III), preserving signal integrity for >50 MHz analog bandwidth. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA602AP | Higher 0.1% settling time (1.2 µs), lower 7 MHz GBW, no external decompensation support. | Not suitable for >100 MHz decompensated applications or 1000 pF capacitive load drive. | Select AD744KNZ when 500 ns settling, >200 MHz decompensated GBW, or guaranteed 1000 pF drive is required. |
| LF412CN | Slower 1.5 µs 0.01% settling, 4 MHz GBW, JFET input but no laser trimming - 2 mV offset max. | Lacks verified THD spec (<0.01%) and fails to meet 16-bit DAC buffer linearity requirements. | Choose AD744KNZ for applications demanding sub-0.5 mV offset, 0.0003% THD, or <500 ns settling in industrial temperature range. |
Compared with OPA602AP and LF412CN, the AD744KNZ uniquely combines 500 ns settling, 75 V/µs slew rate, external decompensation for >200 MHz GBW, and 100% tested 0.0003% THD - making it the only option qualified for 16-bit DAC buffering and wideband preamp roles across –40°C to +85°C.
Availability
AD744KNZ is available at Aetrix Electronics and suitable for industrial instrumentation, precision data acquisition, and high-fidelity audio signal conditioning requiring stable component supply across extended temperature ranges.
Supply support for AD744KNZ 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 AD744KNZ belongs to Analog Devices' precision high-speed op amp product line, engineered specifically for data converter buffering, active filtering, and wideband preamplification in industrial and test equipment where dc accuracy and ac fidelity must coexist.
FAQ
What is the operating temperature range for the AD744KNZ?
The AD744KNZ is rated for industrial temperature operation from –40°C to +85°C, as confirmed in the Ordering Guide on page 14 of Rev. D datasheet. This range is validated for all electrical specifications including offset voltage (0.5 mV max), slew rate (75 V/µs min), and settling time (500 ns typical). The "K" grade designation explicitly denotes this industrial temperature range, distinguishing it from commercial-grade "J" variants.
Does the AD744KNZ require external compensation for unity-gain follower operation?
Yes, the AD744KNZ requires external compensation for stable unity-gain follower operation. As stated in the Product Description (page 1), internal compensation supports unity-gain inverter or noninverting gain ≥ 2, but unity-gain follower stability requires a capacitor (minimum 5 pF) between Pins 5 and 8 per Figure 30 and Table I. Without this capacitor, the AD744KNZ exhibits phase reversal and oscillation in follower configuration.
What package type is used for the AD744KNZ?
The AD744KNZ uses an 8-lead plastic dual-in-line package (PDIP, N-8) per JEDEC MS-012-AA, as specified in the Ordering Guide (page 14) and Outline Dimension Figure 42. This through-hole package has 0.300″ body width, 0.100″ lead pitch, and is RoHS-compliant (denoted by "Z" suffix). It is distinct from SOIC (R-8), CERDIP (Q-8), and TO-99 (H-08) variants.
Can the AD744KNZ drive a 1000 pF capacitive load?
Yes, the AD744KNZ can drive a 1000 pF capacitive load with full stability when externally compensated. Per the "DC PERFORMANCE" section (page 1) and Table II (page 9), a 20 pF capacitor between Pins 5 and 8 enables stable operation into 1000 pF with 14 V/µs slew rate and 1.5 µs 0.01% settling time. This capability is explicitly validated and 100% tested for the AD744KNZ grade.
How does the AD744KNZ compare to the AD744JRZ in terms of performance?
The AD744KNZ and AD744JRZ share identical electrical specifications (500 ns settling, 75 V/µs slew rate, 0.0003% THD), but differ in temperature rating and package: AD744KNZ is industrial-grade (–40°C to +85°C) in PDIP (N-8), while AD744JRZ is commercial-grade (0°C to +70°C) in SOIC (R-8). Both are RoHS-compliant ("Z" suffix), but AD744KNZ is selected for extended-temperature industrial applications requiring guaranteed performance across the full –40°C to +85°C range.
AD744KNZ 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:
- 75V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 13 MHz
- Current - Input Bias:
- 30 pA
- Voltage - Input Offset:
- 250 µV
- Current - Supply:
- 3.5mA
- 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
AD744KNZ FAQ
1.How can I place an order for AD744KNZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD744KNZ 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 AD744KNZ reliable?
The price and inventory of AD744KNZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD744KNZ is usually 5 days.
3.What payment methods are accepted for AD744KNZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD744KNZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD744KNZ?
AD744KNZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD744KNZ 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 AD744KNZ?
For technical support, including AD744KNZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD744KNZ requirements.
6.How does Aetrix verify that AD744KNZ is sourced from the original manufacturer or authorized distributors?
All AD744KNZ 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 AD744KNZ meets industry standards.
7.What is the process for return or replacement of AD744KNZ?
All AD744KNZ units undergo pre-shipment inspection (PSI). If there is an issue with AD744KNZ, 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 AD744KNZ part is unused and in its original packaging.
Return procedure for AD744KNZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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