Wideband Dual-Channel Linear Multiplier/Divider AD539 FEATURES FUNCTIONAL BLOCK DIAGRAM 2-quadrant multiplication/division 6k AD539 W1 2 independent signal channels V CHAN1 OUTPUT Y1 Signal bandwidth of 60 MHz (I ) OUT 6k Z1 Linear control channel bandwidth of 5 MHz V Low distortion (to 0.01%) X 6k Fully calibrated, monolithic circuit Z2 V CHAN2 OUTPUT Y2 APPLICATIONS 6k W2 Precise high bandwidth AGC and VCA systems Voltage-controlled filters Figure 1. Video signal processing High speed analog division Automatic signal-leveling Square-law gain/loss control GENERAL DESCRIPTION The AD539 is a low distortion analog multiplier having two they can be used independently, as in audio stereo applications, identical signal channels (Y1 and Y2), with a common X input with low crosstalk between channels. Voltage-controlled filters providing linear control of gain. Excellent ac characteristics up and oscillators using the state-variable approach are easily to video frequencies and a 3 dB bandwidth of over 60 MHz are designed, taking advantage of the dual channels and common provided. Although intended primarily for applications where control. The AD539 can also be configured as a divider with speed is important, the circuit exhibits good static accuracy in signal bandwidths up to 15 MHz. computational applications. Scaling is accurately determined by Power consumption is only 135 mW using the recommended a band-gap voltage reference and all critical parameters are 5 V supplies. The AD539 is available in three versions: the J laser-trimmed during manufacture. and K grades are specified for 0 to 70C operation and S grade is The full bandwidth can be realized over most of the gain range guaranteed over the extended range of 55C to +125C. The J and using the AD539 with simple resistive loads of up to 100 . K grades are available in either a hermetic ceramic SBDIP (D-16) Output voltage is restricted to a few hundred millivolts under or a low cost PDIP (N-16), whereas the S grade is available in these conditions. ceramic SBDIP (D-16) or LCC (E-20-1). The S grade is availa- ble in MIL-STD-883 and Standard Military Drawing (DESC) The two channels provide flexibility. In single-channel applications, Number 5962-8980901EA versions. they can be used in parallel to double the output current, in series to achieve a square-law gain function with a control range of over 100 dB, or differentially to reduce distortion. Alternatively, 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. 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Trademarks and registered trademarks are the property of their respective owners. 09679-001AD539 TABLE OF CONTENTS Features .............................................................................................. 1 Transfer Function....................................................................... 11 Applications....................................................................................... 1 Dual Signal Channels................................................................. 11 Functional Block Diagram .............................................................. 1 Common Control Channel....................................................... 11 General Description ......................................................................... 1 Flexible Scaling ........................................................................... 11 Revision History ............................................................................... 2 Applications Information .............................................................. 12 Specifications..................................................................................... 3 Basic Multiplier Connections ................................................... 12 Pin Configurations and Function Descriptions ........................... 5 A 50 MHz Voltage-Controlled Amplifier ............................... 15 Typical Performance Characteristics ............................................. 7 Basic Divider Connections ....................................................... 16 Theory of Operation ...................................................................... 10 Outline Dimensions....................................................................... 17 Circuit Description..................................................................... 10 Ordering Guide .......................................................................... 18 General Recommendations....................................................... 10 REVISION HISTORY 4/11Rev. A to Rev. B Moved Dual Signal Channels Section, Common Control Updated Format..................................................................Universal Channel Section, and Flexible Scaling Section........................... 11 Changed Pin Configuration to Functional Block Diagram........ 1 Changes to Figure 20...................................................................... 12 Changes to General Description Section ...................................... 1 Changes to Table 4, Figure 21, and Table 5 ................................. 13 Added Pin Configurations and Function Descriptions Changes to Figure 22 and Figure 23............................................. 14 Section................................................................................................ 5 Changes to Figure 24...................................................................... 15 Added Table 2 Renumbered Sequentially .................................... 5 Changes to Figure 25...................................................................... 16 Added Table 3.................................................................................... 6 Updated Outline Dimensions....................................................... 17 Added Typical Performance Characteristics Section .................. 7 Changes to Ordering Guide .......................................................... 18 Added Figure 6 and Figure 9 Renumbered Sequentially ........... 7 Changes to Figure 18...................................................................... 10 12/91Rev. 0 to Rev. A Rev. B Page 2 of 20