Datasheet AD834 (Analog Devices)

500 MHz Four-Quadrant Multiplier Data Sheet AD834 FEATURES FUNCTIONAL BLOCK DIAGRAM DC to >500 MHz operation V TO I AD834 X1 7 8.5mA Differential ±1 V full-scale inputs 5 W1 X2 8 Differential ±4 mA full-scale output current Low distortion (≤0.05% for 0 dBm input) DISTORTION CANCELLATION Supply voltages from ±4 V to ±9 V CURRENT AMPLIFIER ±4mA FS Low power (280 mW typical at V DISTORTION (W) S = ±5 V) CANCELLATION APPLICATIONS V TO I 8.5mA Y2 2 4 High speed real time computation W2 Y1 1 Wideband modulation and gain control
001
Signal correlation and RF power measurement
00894-
Voltage controlled filters and oscillators
Figure 1.
Linear keyers for high resolution television Wideband true RMS GENERAL DESCRIPTION
The AD834 is a monolithic, laser-trimmed four-quadrant analog CERDIP, operates over the military temperature range of −55°C multiplier intended for use in high frequency applications, with to +125°C. S-grade chips are also available. a transconductance bandwidth (RL = 50 Ω) in excess of 500 MHz Two application notes featuring the AD834 (AN-212 and AN-216) from either of the differential voltage inputs. In multiplier can be found at www.analog.com. For additional applications modes, the typical total full-scale error is 0.5%, dependent on circuits, consult the AD811 data sheet. the application mode and the external circuitry. Performance is relatively insensitive to temperature and supply variations due
PRODUCT HIGHLIGHTS
to the use of stable biasing based on a band gap reference generator 1. Combines high static accuracy (low input and output and other design features. offsets and accurate scale factor) with very high bandwidth. To preserve the ful bandwidth potential of the high speed bipolar As a four-quadrant multiplier or squarer, the response process used to fabricate the AD834, the outputs appear as a extends from dc to an upper frequency limited by packaging differential pair of currents at open collectors. To provide a and external board layout considerations. Obtains a large single-ended ground referenced voltage output, some form of signal bandwidth of >500 MHz under optimum conditions. external current-to-voltage conversion is needed. This may take 2. Used in many high speed nonlinear operations, such as the form of a wideband transformer, balun, or active circuitry square rooting, analog division, vector addition, and rms- such as an op amp. In some applications (such as power measure- to-dc conversion. In these modes, the bandwidth is limited ment), the subsequent signal processing may not need to have by the external active components. high bandwidth. 3. Special design techniques result in low distortion levels (better than −60 dB on either input) at high frequencies The transfer function is accurately trimmed such that when and low signal feedthrough (typical y −65 dB up to 20 MHz). X = Y = ±1 V, the differential output is ±4 mA. This absolute 4. Exhibits low differential phase error over the input range— calibration allows the outputs of two or more AD834 devices typically 0.08° at 5 MHz and 0.8° at 50 MHz. The large to be summed with precisely equal weighting, independent of signal transient response is free from overshoot and has an the accuracy of the load circuit. intrinsic rise time of 500 ps, typically settling to within 1% The AD834J, available in 8-lead PDIP and plastic SOIC packages, is in under 5 ns. specified over the commercial temperature range of 0°C to 70°C. 5. The nonloading, high impedance, differential inputs The AD834A is also available in 8-lead CERDIP and plastic SOIC simplify the application of the AD834. packages operating over the industrial temperature range of −40°C to +85°C. The AD834SQ/883B, available in an 8-lead
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Document Outline Features Applications Functional Block Diagram General Description Product Highlights Revision History Specifications Absolute Maximum Ratings Thermal Characteristics Chip Dimensions and Bonding Diagram ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Test Circuits Explanation of Typical Performance Characteristics and Test Circuits Theory of Operation Transfer Function Biasing the Output Transformer Coupling Wideband Multiplier Connections Power Measurement (Mean-Square and RMS) Frequency Doubler Wideband Three-Signal Multiplier/Divider Outline Dimensions Ordering Guide