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AD834JR-REEL7 Arkusz danych(PDF) 1 Page - Analog Devices |
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AD834JR-REEL7 Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 8 page FUNCTIONAL BLOCK DIAGRAM (W) REV. C 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. a 500 MHz Four-Quadrant Multiplier AD834 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2000 FEATURES DC to >500 MHz Operation Differential 1 V Full-Scale Inputs Differential 4 mA Full-Scale Output Current Low Distortion ( ≤0.05% for 0 dBm Input) Supply Voltages from 4 V to 9 V Low Power (280 mW typical at VS = 5 V) APPLICATIONS High Speed Real Time Computation Wideband Modulation and Gain Control Signal Correlation and RF Power Measurement Voltage Controlled Filters and Oscillators Linear Keyers for High Resolution Television Wideband True RMS PRODUCT DESCRIPTION The AD834 is a monolithic laser-trimmed four-quadrant analog multiplier intended for use in high frequency applications, hav- ing a transconductance bandwidth (RL = 50 Ω) in excess of 500 MHz from either of the differential voltage inputs. In multi- plier modes, the typical total full-scale error is 0.5%, dependent on the application mode and the external circuitry. Performance is relatively insensitive to temperature and supply variations, due to the use of stable biasing based on a bandgap reference genera- tor and other design features. To preserve the full bandwidth potential of the high speed bipolar process used to fabricate the AD834, the outputs appear as a differential pair of currents at open collectors. To provide a single ended ground referenced voltage output, some form of ex- ternal current to voltage conversion is needed. This may take the form of a wideband transformer, balun, or active circuitry such as an op amp. In some applications (such as power measure- ment) the subsequent signal processing may not need to have high bandwidth. The transfer function is accurately trimmed such that when X = Y = ±1 V, the differential output is ±4 mA. This absolute calibration allows the outputs of two or more AD834s to be summed with precisely equal weighting, independent of the accuracy of the load circuit. The AD834J is specified for use over the commercial tempera- ture range of 0 °C to +70°C and is available in an 8-lead DIP package and an 8-lead plastic SOIC package. AD834A is avail- able in cerdip and 8-lead plastic SOIC packages for operation over the industrial temperature range of –40 °C to +85°C. The AD834S/883B is specified for operation over the military tem- perature range of –55 °C to +125°C and is available in the 8-lead cerdip package. S-Grade chips are also available. Two application notes featuring the AD834 (AN-212 and AN-216) can now be obtained by calling 1-800-ANALOG-D. For additional applications circuits consult the AD811 data sheet. PRODUCT HIGHLIGHTS l. The AD834 combines high static accuracy (low input and output offsets and accurate scale factor) with very high band- width. As a four-quadrant multiplier or squarer, the response extends from dc to an upper frequency limited mainly by packaging and external board layout considerations. A large signal bandwidth of over 500 MHz is attainable under opti- mum conditions. 2. The AD834 can be used in many high speed nonlinear operations, such as square rooting, analog division, vector addition and rms-to-dc conversion. In these modes, the bandwidth is limited by the external active components. 3. Special design techniques result in low distortion levels (better than –60 dB on either input) at high frequencies and low signal feedthrough (typically –65 dB up to 20 MHz). 4. The AD834 exhibits low differential phase error over the input range—typically 0.08 ° at 5 MHz and 0.8° at 50 MHz. The large signal transient response is free from overshoot, and has an intrinsic rise time of 500 ps, typically settling to within 1% in under 5 ns. 5. The nonloading, high impedance, differential inputs simplify the application of the AD834. |
Podobny numer części - AD834JR-REEL7 |
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Podobny opis - AD834JR-REEL7 |
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