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AD544JH

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a High Performance, BiFET Operational Amplifiers AD542/AD544/AD547 FEATURES Ultralow Drift: 1 ␮V/؇C (AD547L) Low Offset Voltage: 0.25 mV (AD547L) Low Input Bias Currents: 25 pA max Low Quiescent Current: 1.5 mA Low Noise: 2 ␮V p-p High Open Loop Gain: 110 dB High Slew Rate: 13 V/␮s Fast Settling to ؎0.01%: 3 ␮s Low Total Harmonic Distortion: 0.0025% Available in Hermetic Metal Can and Die Form MIL-STD-883B Versions Available Dual Versions Available: AD642, AD644, AD647 OBS PRODUCT DESCRIPTION CONNECTION DIAGRAM TAB 8 NULL INVERTING INPUT 1 +V 7 2 6 3 NONINVERTING INPUT 5 OUTPUT NULL 4 –V NOTE: PIN 4 CONNECTED TO CASE OLE The BiFET series of precision, monolithic FET-input op amps are fabricated with the most advanced BiFET and laser trimming technologies. The AD542, AD544, AD547 series offers bias currents significantly lower than currently available BiFET devices, 25 pA max, warmed up. In addition, the offset voltage is laser trimmed to less than 0.25 mV on the AD547L, which is achieved by utilizing Analog Devices’ exclusive laser wafer trimming (LWT) process. When combined with the AD547’s low offset drift (1 µV/°C), these features offer the user performance superior to existing BiFET op amps at low BiFET pricing. The AD542 or AD547 is recommended for any operational amplifier application requiring excellent dc performance at low to moderate cost. Precision instrument front ends requiring accurate amplification of millivolt level signals from megohm source impedances will benefit from the device’s excellent combination of low offset voltage and drift, low bias current and low 1/f noise. High common-mode rejection (80 dB, min on the “K” and “L” grades) and high open-loop gain, even under heavy loading, ensures better than “12-bit” linearity in high impedance buffer applications. PRODUCT HIGHLIGHTS 1. Improved bipolar and JFET processing results in the lowest bias current available in a monolithic FET op amp. TE 2. Analog Devices, unlike some manufacturers, specifies each device for the maximum bias current at either input in the warmed-up condition, thus assuring the user that the device will meet its published specifications in actual use. 3. Advanced laser wafer trimming techniques reduce offset voltage drift to 1 µV/°C max and offset voltage to only 0.25 mV max on the AD547L. 4. Low voltage noise (2 µV p-p) and low offset voltage drift enhance performance as a precision op amp. 5. High slew rate (13 V/µs) and fast settling time to 0.01% (3 µs) make the AD544 ideal for D/A, A/D, sample-hold circuits and high speed integrators. 6. Low harmonic distortion (0.0025%) make the AD544 an ideal choice in audio applications. 7. Bare die are available for use in hybrid circuit applications. The AD544 is recommended for any op amp applications requiring excellent ac and dc performance at low cost. The 2 MHz bandwidth and low offset of the AD544 make it the first choice as an output amplifier for current output D/A converters, such as the AD7541, 12-bit CMOS DAC. Devices in this series are available in four grades: the “J,” “K,” and “L” grades are specified over the 0°C to +70°C temperature range and the “S” grade over the –55°C to +125°C operating temperature range. All devices are offered in the hermetically sealed, TO-99 metal can package. 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. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703

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