a FEATURES AC PERFORMANCE 500 ns Settling to 0.01% for 10 V Step 1.5 s Settling to 0.0025% for 10 V Step 75 V/s Slew Rate 0.0003% Total Harmonic Distortion (THD) 13 MHz Gain Bandwidth – Internal Compensation >200 MHz Gain Bandwidth (G = 1000) External Decompensation >1000 pF Capacitive Load Drive Capability with 10 V/s Slew Rate – External Compensation DC PERFORMANCE 0.25 mV max Offset Voltage (AD744C) 3 V/°C max Drift (AD744C) 250 V/mV min Open-Loop Gain (AD744B) 4 V p max Noise, 0.1 Hz to 10 Hz (AD744C) Available in Plastic Mini-DIP, Plastic SOIC, Hermetic Cerdip, Hermetic Metal Can Packages and Chip Form MIL-STD-883B Processing Available Surface Mount (SOIC) Package Available in Tape and Reel in Accordance with EIA-481A Standard APPLICATIONS Output Buffers for 12-Bit, 14-Bit and 16-Bit DACs, ADC Buffers, Cable Drivers, Wideband Preamplifiers and Active Filters PRODUCT DESCRIPTION
The AD744 is a fast-settling, precision, FET input, monolithic operational amplifier. It offers the excellent dc characteristics of the AD711 BiFET family with enhanced settling, slew rate, and bandwidth. The AD744 also offers the option of using custom compensation to achieve exceptional capacitive load drive capability. The single-pole response of the AD744 provides fast settling: 500 ns to 0.01%. This feature, combined with its high dc precision, makes it suitable for use as a buffer amplifier for 12-bit, 14-bit or 16-bit DACs and ADCs. Furthermore, the AD744’s low total harmonic distortion (THD) level of 0.0003% and gain bandwidth product of 13 MHz make it an ideal amplifier for demanding audio applications. It is also an excellent choice for use in active filters in 12-bit, 14-bit and 16-bit data acquisition systems. The AD744 is internally compensated for stable operation as a unity gain inverter or as a noninverting amplifier with a gain of two or greater. External compensation may be applied to the AD744 for stable operation as a unity gain follower. External compensation also allows the AD744 to drive 1000 pF capacitive loads, slewing at 10 V/µs with full stability.
Precision, 500 ns Settling BiFET Op Amp AD744 CONNECTION DIAGRAMS TO-99 (H) Package
8-Pin Plastic Mini-DIP (N) 8-Pin SOIC (R) Package and 8-Pin Cerdip (Q) Packages
Alternatively, external decompensation may be used to increase the gain bandwidth of the AD744 to over 200 MHz at high gains. This makes the AD744 ideal for use as ac preamps in digital signal processing (DSP) front ends. The AD744 is available in seven performance grades. The AD744J and AD744K are rated over the commercial temperature range of 0°C to +70°C. The AD744A, AD744B and AD744C are rated over the industrial temperature range of –40°C to +85°C. The AD744S and AD744T are rated over the military temperature range of –55°C to +125°C and are available processed to MIL-STD-883B, Rev. C. Extended reliability PLUS screening is available, specified over the commercial and industrial temperature ranges. PLUS screening includes a 168-hour burn-in, as well as other environmental and physical tests. The AD744 is available in an 8-pin plastic mini-DIP, 8-pin small outline, 8-pin cerdip or TO-99 metal can. PRODUCT HIGHLIGHTS
1. The AD744 is a high-speed BiFET op amp that offers excellent performance at competitive prices. It outperforms the OPA602/OPA606, LF356 and LF400. 2. The AD744 offers exceptional dynamic response. It settles to 0.01% in 500 ns and has a 100% tested minimum slew rate of 50 V/µs (AD744B). 3. The combination of Analog Devices’ advanced processing technology, laser wafer drift trimming and well-matched ionimplanted JFETs provide outstanding dc precision. Input offset voltage, input bias current, and input offset current are specified in the warmed-up condition; all are 100% tested. 4. The AD744 has a guaranteed and tested maximum voltage noise of 4 µV p, 0.1 Hz to 10 Hz (AD744C).
REV. B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
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