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Analog Devices Inc. AD744KRZ
- Part No.:
- AD744KRZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD744KRZ.pdf
- Description:
- IC OPAMP JFET 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,254
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Product details
Overview
AD744KRZ 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 AD744KRZ datasheet, AD744KRZ pinout, AD744KRZ application, or AD744KRZ equivalent, this page provides verified specifications, SOIC-8 package details, real-world settling behavior, capacitive load drive capability with external compensation, and validated alternative op amps for DAC/ADC interface design.
Technical Context
The AD744KRZ features a single-pole dominant-pole internal compensation architecture enabling stable unity-gain inverting operation and noninverting gain ≥2. Its BiFET input stage provides 3 TΩ||5.5 pF input impedance and sub-100 pA bias current at +25°C, supporting high-impedance sensor and reference interfaces.
External decompensation between Pins 1 and 5 enables >200 MHz gain bandwidth at G = 1000, while external compensation between Pins 5 and 8 supports stable unity-gain follower operation and full-swing drive of ≥1000 pF capacitive loads at 10 V/µs slew rate.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Settling Time (0.01%) | 500 ns typical at G = –1; enables <500 ns system-level settling for 12–16-bit DAC codes. |
| Slew Rate | 75 V/µs min; ensures linear full-scale transitions without slewing-induced distortion. |
| Gain Bandwidth Product | 13 MHz (internal comp); supports closed-loop bandwidths up to ~10 MHz at G = 1. |
| Total Harmonic Distortion | 0.0003% at 1 kHz, 3 Vrms; preserves signal fidelity in audio and precision analog front ends. |
| Input Offset Voltage | 0.5 mV max (AD744B grade); AD744KRZ is K-grade, specified ≤1.0 mV over 0°C to +70°C. |
| Capacitive Load Drive | ≥1000 pF with external compensation; eliminates need for isolation resistors in cable driver applications. |
| Supply Voltage Range | ±4.5 V to ±18 V; supports dual-rail operation in industrial and test equipment power domains. |
Pinout & Package
AD744KRZ is packaged in an 8-lead SOIC_N (R-8) surface-mount package per JEDEC MS-001, 5.0 mm × 6.2 mm body, 1.27 mm lead pitch, RoHS-compliant (Z suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Compensation / Decompensation | Connect to Pin 5 for external compensation; connect to Pin 5 with 2–10 pF trimmer for decompensation. |
| 2 | Inverting Input (–IN) | High-impedance FET input node; requires guarding in low-noise layouts. |
| 3 | Noninverting Input (+IN) | Matched to Pin 2 for common-mode rejection; 3 TΩ||5.5 pF input impedance. |
| 4 | –VS | Negative supply rail; must be bypassed with 0.1 µF ceramic + 1 µF electrolytic near package. |
| 5 | Compensation / Null | Connect to Pin 1 for compensation; use with external capacitor for stability or null adjustment. |
| 6 | Output | Capable of ±13.9 V swing into 2 kΩ; drives ≥1000 pF with CCOMP = 20 pF. |
| 7 | +VS | Positive supply rail; same bypassing requirement as Pin 4. |
| 8 | Null / Compensation | Second null terminal; tied to Pin 5 for standard compensation configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Precision settling performance | 500 ns to 0.01% enables direct interfacing with 12–16-bit DACs without added latency. |
| Configurable compensation | Single external capacitor (Pins 1–5 or 5–8) allows trade-off between bandwidth, slew rate, and capacitive load stability. |
| FET-input DC accuracy | ≤1.0 mV offset and ≤100 pA bias current at +25°C support high-gain, high-Z sensor signal conditioning. |
| Robust capacitive drive | Stable operation into ≥1000 pF loads eliminates need for series isolation resistors in video/cable driver designs. |
| Low THD wideband linearity | 0.0003% THD at 1 kHz enables clean signal amplification in audio and spectral analysis paths. |
Applications
| ADC Buffering | DAC Output Buffering |
|---|---|
Use Scenario: Front-end buffering for 14-bit SAR or sigma-delta ADCs sampling at 1 MSPS+ in automated test equipment. IC Role / Device Role / Timing Role: Drives ADC input capacitance while maintaining full-scale step accuracy and minimizing aperture uncertainty. Use Value: 500 ns settling ensures no acquisition-time penalty; 0.0003% THD preserves SNR in high-resolution digitization. | Use Scenario: Voltage-output stage for AD565A and similar fast 12–16-bit current-output DACs in waveform generators. IC Role / Device Role / Timing Role: I-to-V converter with matched settling to DAC's 250 ns native speed. Use Value: Combined AD565A/AD744KRZ settles <500 ns to ½ LSB (2.44 mV), preserving DAC resolution. |
| Active Filter Stage | Cable Driver |
Use Scenario: Second-order Sallen-Key or MFB filter in 12-bit data acquisition systems requiring flat group delay. IC Role / Device Role / Timing Role: High-Q, low-distortion gain stage with 13 MHz GBW enabling filter cutoffs up to 2 MHz. Use Value: 75 V/µs slew rate prevents slew-induced harmonic generation at filter passband edges. | Use Scenario: 75 Ω coaxial driver for oscilloscope front ends or video signal distribution over 10+ meter cables. IC Role / Device Role / Timing Role: Low-output-impedance voltage source capable of driving ≥1000 pF + cable capacitance. Use Value: External CCOMP = 20 pF enables stable 10 V/µs drive into full cable + termination load. |
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 0.0002% THD, but only 350 ns settling to 0.01%; lower 50 V/µs slew rate; no external decompensation option. | Better THD for ultra-low-distortion audio, but slower settling limits DAC/ADC buffer use. | Select OPA602AP when THD <0.0002% is critical and settling time >350 ns is acceptable. |
| AD8065ARZ | Higher 145 MHz GBW, 180 V/µs slew, but 1.5 mV offset and 0.001% THD; not FET-input (2.5 µA bias current). | Superior speed for RF/IF gain stages, but higher input current limits high-Z sensor use. | Select AD8065ARZ for >50 MHz closed-loop bandwidth where input bias current is not limiting. |
Compared with OPA602AP and AD8065ARZ, the AD744KRZ uniquely balances sub-500 ns settling, FET-input impedance, and configurable compensation - making it the only choice among the three for precision DAC buffering with full capacitive load drive.
Availability
AD744KRZ is available at Aetrix Electronics and suitable for precision data acquisition, high-fidelity audio signal chains, and automated test equipment requiring stable component supply across commercial temperature range (0°C to +70°C).
Supply support for AD744KRZ 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 AD744KRZ belongs to the AD744 BiFET op amp family, designed specifically for high-speed precision buffering in data conversion systems where settling time, THD, and capacitive load drive are critical.
FAQ
What is the maximum capacitive load the AD744KRZ can drive stably?
The AD744KRZ can drive ≥1000 pF capacitive loads stably when externally compensated with a 20 pF capacitor between Pins 5 and 8. Under this configuration, it maintains 10 V/µs slew rate and 0.01% settling in 1.5 µs. Driving larger loads (e.g., 2000 pF) requires increasing CCOMP to 25 pF, reducing slew rate to 12.5 V/µs but preserving stability. The AD744KRZ datasheet Table II confirms this behavior for G = 2 configurations.
Does the AD744KRZ require external compensation for unity-gain follower operation?
Yes, the AD744KRZ is internally compensated for stable operation as a unity-gain inverter or noninverting amplifier with gain ≥2, but it requires external compensation (5 pF minimum between Pins 5 and 8) for stable unity-gain voltage follower use. This is explicitly stated in the AD744 Rev. D datasheet Section "External Frequency Compensation" and Figure 30. Without this capacitor, the unity-gain follower exhibits phase reversal and oscillation.
What is the operating temperature range of the AD744KRZ?
The AD744KRZ is rated for the commercial temperature range of 0°C to +70°C, as confirmed in the Ordering Guide on page 14 of the AD744 Rev. D datasheet. This distinguishes it from AD744A/B (–40°C to +85°C) and AD744T (–55°C to +125°C) variants. All electrical specifications for AD744KRZ are guaranteed within this 0°C to +70°C range.
How does the AD744KRZ achieve >200 MHz gain bandwidth?
The AD744KRZ achieves >200 MHz gain bandwidth through external decompensation: connecting a 2–10 pF trimmer capacitor between Pins 1 and 5 cancels the internal compensation capacitor, shifting the dominant pole and extending bandwidth at high gains. Table III in the AD744 Rev. D datasheet shows 225 MHz gain-bandwidth product at G = 1000 using this method. This decompensation is optional and only recommended for fixed high-gain AC-coupled applications.
Is the AD744KRZ pin-compatible with other op amps like the OP27 or AD711?
No, the AD744KRZ is not pin-compatible with OP27 (8-lead metal can, different pinout) or AD711 (8-lead SOIC but distinct compensation/offset null pin mapping). The AD744KRZ uses a unique SOIC-8 pinout with Pins 1 and 5 designated for compensation/decompensation and nulling, unlike the standard op amp configuration. Substituting requires PCB layout revision. Verified pinout is shown in Figure 28 and Table II of the AD744 Rev. D datasheet.
AD744KRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AD744KRZ FAQ
1.How can I place an order for AD744KRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD744KRZ 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 AD744KRZ reliable?
The price and inventory of AD744KRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD744KRZ is usually 5 days.
3.What payment methods are accepted for AD744KRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD744KRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD744KRZ?
AD744KRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD744KRZ 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 AD744KRZ?
For technical support, including AD744KRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD744KRZ requirements.
6.How does Aetrix verify that AD744KRZ is sourced from the original manufacturer or authorized distributors?
All AD744KRZ 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 AD744KRZ meets industry standards.
7.What is the process for return or replacement of AD744KRZ?
All AD744KRZ units undergo pre-shipment inspection (PSI). If there is an issue with AD744KRZ, 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 AD744KRZ part is unused and in its original packaging.
Return procedure for AD744KRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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