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Analog Devices Inc. AD744KR
- Part No.:
- AD744KR
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD744KR.pdf
- Description:
- IC OPAMP JFET 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,882
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Product details
Overview
AD744KR 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 - making it ideal as an output buffer for 12-bit to 16-bit DACs and ADCs in precision instrumentation.
For engineers reviewing the AD744KR datasheet, AD744KR pinout, AD744KR application, or AD744KR equivalent, key selection criteria include verified 0.01% settling time, capacitive load drive capability up to 1000 pF with external compensation, guaranteed DC precision (≤0.5 mV offset, ≤10 µV/°C drift), and SOIC-8 packaging compatibility with EIA-481A tape-and-reel delivery.
Technical Context
The AD744KR is a BiFET op amp featuring laser-trimmed JFET input stage and advanced internal compensation for unity-gain inverter or ≥2× noninverting stability. Its single-pole dominant response enables fast settling without overshoot, while external decompensation between Pins 1 and 5 supports >200 MHz gain bandwidth at G = 1000.
DC performance is specified over 0°C to +70°C (commercial grade), with 100% tested input offset voltage ≤0.5 mV, open-loop gain ≥250 V/mV, and input bias current ≤100 pA at 25°C - all enabled by ion-implanted, matched JFETs and wafer-level drift trimming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Settling Time (0.01%) | 500 ns - enables full-scale code transitions in 12–16-bit DACs without adding timing margin |
| Slew Rate | 75 V/µs - supports 10 V step response within 133 ns, critical for wideband preamplifier stages |
| Gain Bandwidth (G = –1) | 13 MHz - ensures stable unity-gain inverter operation with minimal phase margin degradation |
| Total Harmonic Distortion | 0.0003% at 1 kHz - preserves signal fidelity in audio and precision measurement front ends |
| Input Offset Voltage | ≤0.5 mV max - reduces DC error in closed-loop gain configurations without nulling circuitry |
| Capacitive Load Drive | 1000 pF with external compensation - allows direct interface to long cables or ADC input capacitance |
| Supply Voltage Range | ±4.5 V to ±18 V - supports dual-rail operation across industrial and test equipment power domains |
Pinout & Package
AD744KR is supplied in an 8-lead SOIC_N (R-8) package per JEDEC MS-001, with gull-wing leads, 1.27 mm pitch, and RoHS-compliant finish. The package supports automated placement and reflow soldering per EIA-481A tape-and-reel standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Compensation / Null | Connect external capacitor (e.g., 5 pF) to Pin 8 for unity-gain follower stability or decompensate with Pin 5 for >200 MHz GBW |
| 2 | Inverting Input (–IN) | High-impedance FET node; input bias current ≤100 pA enables high-Z sensor interfacing |
| 3 | Noninverting Input (+IN) | Differential input pair node; common-mode range extends to ±14.5 V / –11.5 V on ±15 V supplies |
| 4 | –VS | Negative supply rail; requires 0.1 µF ceramic + 1 µF electrolytic bypass per Analog Devices' Figure 24 |
| 5 | Compensation / Decompensation | Internal compensation node; connect to Pin 1 for decompensation or Pin 8 for stabilization |
| 6 | Output | Capable of driving ≥2 kΩ loads to ±13 V; maintains 14 V/µs slew into 1000 pF with CCOMP = 20 pF |
| 7 | +VS | Positive supply rail; same bypassing requirement as Pin 4; thermal resistance θJA = 160°C/W |
| 8 | Null / Compensation | Offset null terminal (pins 1 & 8); also used with Pin 1 for external compensation network |
Key Features
| Feature | Design Value |
|---|---|
| FET-input architecture | Input bias current ≤100 pA enables high-impedance transducer and photodiode interfaces without guard traces |
| Single-pole dominant response | Eliminates peaking in DAC buffer applications; achieves 0.01% settling in 500 ns without post-filtering |
| External decompensation support | Extends gain bandwidth to >200 MHz at G = 1000 - suitable for DSP front-end ac preamplifiers |
| 1000 pF capacitive load drive | Stable operation into cable or ADC input capacitance without added isolation resistor or gain penalty |
| Laser wafer drift trimming | Guarantees ≤0.5 mV input offset and ≤10 µV/°C drift over 0°C to +70°C - no system-level calibration needed |
Applications
| ADC Buffering | DAC Output Buffering |
|---|---|
|
Use Scenario: Front-end buffering for 16-bit SAR ADCs with 100 kSPS sampling and ±10 V input range. IC Role / Device Role / Timing Role: Precision voltage follower with <500 ns settling ensures full-scale transitions meet aperture uncertainty requirements. Use Value: Eliminates need for external RC filtering; preserves SNR >92 dB by minimizing THD-induced harmonic folding. |
Use Scenario: Voltage output stage for AD565A 12-bit current-output DAC in bipolar ±10 V mode. IC Role / Device Role / Timing Role: I-to-V converter with 10 pF CLEAD compensation matching DAC output capacitance. Use Value: Achieves <500 ns total system settling to ½ LSB (2.44 mV), maintaining DAC's native speed specification. |
| Active Filter Stage | Cable Driver |
|
Use Scenario: Second-order Sallen-Key low-pass filter in 14-bit data acquisition system with 1 MHz cutoff. IC Role / Device Role / Timing Role: Unity-gain buffer isolating filter output from downstream multiplexer capacitance. Use Value: Maintains filter Q-factor and passband flatness by driving 500 pF load without gain peaking or phase shift. |
Use Scenario: Driving 3 m coaxial cable (≈300 pF) from FPGA DAC output to remote analog subsystem. IC Role / Device Role / Timing Role: High-slew-rate line driver configured as noninverting amplifier (G = 2). Use Value: Delivers full 10 V step with <750 ns 0.01% settling and <0.001% THD - prevents inter-symbol interference. |
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 |
|---|---|---|---|
| OPA602AU | Higher 0.0002% THD but slower 1.2 µs settling to 0.01%; no external decompensation option; SOIC-8 only | Better for ultra-low-distortion audio; unsuitable for DAC buffering requiring sub-microsecond settling | Select OPA602AU only when THD is prioritized over speed and decompensation flexibility is unnecessary |
| LF412CN | Lower 10 V/µs slew rate; 3 MHz GBW; no guaranteed 0.01% settling spec; PDIP-8 only; no RoHS option | Acceptable for 12-bit DACs with >5 µs timing budget; not viable for 14/16-bit or high-frequency active filters | Choose LF412CN only for cost-sensitive, non-RoHS, low-speed industrial designs where precision is secondary |
Compared with OPA602AU and LF412CN, AD744KR uniquely balances 500 ns settling, 75 V/µs slew, 0.0003% THD, and external decompensation - making it the only choice for time-critical, high-resolution data conversion buffering where both speed and linearity are mandatory.
Availability
AD744KR is available at Aetrix Electronics and suitable for precision data acquisition, high-fidelity audio signal chains, and industrial DAC/ADC interface circuits requiring stable component supply, RoHS compliance, and tape-and-reel manufacturability.
Supply support for AD744KR 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 AD744 family was designed specifically for high-speed, precision buffering in data conversion systems - targeting 12-bit to 16-bit DAC/ADC interfaces where settling time, THD, and capacitive load drive are critical.
FAQ
What is the guaranteed settling time specification for AD744KR?
The AD744KR is guaranteed to settle to 0.01% in 500 ns for a 10 V step under G = –1, RL ≥ 2 kΩ, and CL = 10 pF conditions. This value is 100% tested per Rev. D datasheet Table, and applies directly to the AD744KR commercial-grade SOIC-8 variant. The AD744KR meets this spec without external components when used in inverting configuration.
Does AD744KR support unity-gain voltage follower operation?
Yes, AD744KR supports unity-gain voltage follower operation, but requires external compensation: a minimum 5 pF capacitor must be connected between Pin 1 (Comp/Null) and Pin 8 (Null/Comp) per Figure 30 and Table I. Without this capacitor, the AD744KR is unstable in unity-gain follower mode due to phase margin limitations.
What is the maximum capacitive load AD744KR can drive stably?
The AD744KR can drive up to 1000 pF stably with external compensation (CCOMP = 20 pF between Pins 5 and 8), maintaining 0.01% settling in 1.5 µs and 14 V/µs slew rate per datasheet Note 8 and Table II. Driving >1000 pF requires larger CCOMP, which reduces slew rate and bandwidth proportionally.
Is AD744KR RoHS compliant and what package does it use?
Yes, AD744KR is RoHS compliant (denoted by "Z" suffix in AD744KRZ-REEL7) and supplied in an 8-lead SOIC_N (R-8) package per JEDEC MS-001. The package features gull-wing leads, 1.27 mm pitch, and is qualified for reflow soldering per EIA-481A tape-and-reel standards.
How does AD744KR differ from AD744J or AD744B variants?
AD744KR is the commercial-grade (0°C to +70°C) SOIC-8 variant with guaranteed 0.5 mV max offset and 75 V/µs min slew rate. AD744J is the same grade but in PDIP-8; AD744B is industrial-grade (–40°C to +85°C) with tighter 0.25 mV offset and 10 µV/°C drift specs - all share identical pinout, compensation behavior, and AC performance curves.
AD744KR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AD744KR FAQ
1.How can I place an order for AD744KR through Aetrix?
Please submit a Request for Quotation (RFQ) for AD744KR 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 AD744KR reliable?
The price and inventory of AD744KR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD744KR is usually 5 days.
3.What payment methods are accepted for AD744KR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD744KR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD744KR?
AD744KR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD744KR 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 AD744KR?
For technical support, including AD744KR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD744KR requirements.
6.How does Aetrix verify that AD744KR is sourced from the original manufacturer or authorized distributors?
All AD744KR 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 AD744KR meets industry standards.
7.What is the process for return or replacement of AD744KR?
All AD744KR units undergo pre-shipment inspection (PSI). If there is an issue with AD744KR, 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 AD744KR part is unused and in its original packaging.
Return procedure for AD744KR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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