AD246JY

a Clock Driver AD246 GENERAL DESCRIPTION The AD246 is a compact, inexpensive clock driver that can be used to obtain the required clock from a single 15 V supply. The circuit shown in Figure 1 (essentially an AD246) can operate at least 32 AD204s at the rated minimum supply voltage of 14.25 V and one additional isolator can be operated for each 40 mV increase in supply voltage up to 15 V. A supply bypass capacitor is included in the AD246, but if many AD204s are operated from a single AD246, an external bypass connector should be used with a value of at least 1 mF for every five isolators used. Place the capacitor as close as possible to the clock driver. 180pF 1 2 3 14 6 C RC 15V 6 TELEDYNE TSC426 5 Q CD 4947B 10 R IN914 2 7 4 5 49.9k⍀ CLKOUT + 1␮F 35V IN914 12 9 8 7 4 3 CLK AND PWR COM AD246 SPECIFICATIONS (Typical @ 25∞C and VS = 15 V, unless otherwise noted.) Model AD246JY OUTPUT* Frequency Voltage Fan Out 25 kHz Nominal 25 kHz Nominal 15 V p-p Nominal 15 V p-p Nominal 32 max 32 max POWER SUPPLY REQUIREMENTS Input Voltage Supply Current Unloaded Each AD204 Adds 1 mA Load on AD204 +VISO or –VISO Adds AD246JN 15 V ± 5% 15 V ± 5% 35 mA 2.2 mA 35 mA 2.2 mA 0.7 mA 0.7 mA *The high current drive will not support a short to ground. Specifications are subject to change without notice. Figure 1. Clock Driver AD246 Pin Designations Pin (Y) Pin (N) Function 1 2 12 13 12 1 14 24 15 V Power In Clock Output Common Common OUTLINE DIMENSIONS AD246JY Package AD246JN Package Dimensions shown in inches and (millimeters) Dimensions shown in inches and (millimeters) 8.40 (0.330) MAX 36.70 (1.445) MAX 25.30 (0.995) MAX AD246JN 8.90 (0.350) MAX FRONT VIEW 15.90 (0.625) MAX AD246JY FRONT VIEW 2.50 (0.100) MIN 2.50 (0.100) MIN 0.38 (0.015) 0.25 (0.010) 1.30 (0.050) NOM 2.90 (0.115) 14.00 (0.550) 13 1 2.50 (0.100) BOTTOM VIEW CL 2 0.51 (0.020) 0.25 (0.010) 12 CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN 0.51 (0.020) 0.38 (0.015) 3.70 (0.145) 27.90 (1.100) 2.50 (0.100) NOM 0.38 (0.015) 0.25 (0.010) 5.00 (0.197) 2.90 (0.115) SIDE VIEW 1 12.70 (0. 500) 12 17.80 (0.700) BOTTOM VIEW 24 14 25.40 (1.000) CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN REV. 0 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 that 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: 781/329-4700 www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2002 –2– PRINTED IN U.S.A. C02934–0–10/02(0)