a Clock Driver AD246 GENERAL DESCRIPTION AD246 SPECIFICATIONS The AD246 is a compact, inexpensive clock driver that can be (Typical 25 C and V = 15 V, unless otherwise noted.) S used to obtain the required clock from a single 15 V supply. The Model AD246JY AD246JN circuit shown in Figure 1 (essentially an AD246) can operate at least 32 AD204s at the rated minimum supply voltage of 14.25 V OUTPUT* and one additional isolator can be operated for each 40 mV Frequency 25 kHz Nominal 25 kHz Nominal increase in supply voltage up to 15 V. Voltage 15 V p-p Nominal 15 V p-p Nominal Fan Out 32 max 32 max A supply bypass capacitor is included in the AD246, but if many AD204s are operated from a single AD246, an external bypass POWER SUPPLY connector should be used with a value of at least 1 mF for every REQUIREMENTS five isolators used. Place the capacitor as close as possible to the Input Voltage 15 V 5% 15 V 5% clock driver. Supply Current Unloaded 35 mA 35 mA 15V 6 14 6 Each AD204 2.2 mA 2.2 mA 5 180pF TELEDYNE 1 IN914 Adds 1 mA C TSC426 10 2 2 7 Load on AD204 RC Q CLKOUT CD 4947B +V or ISO 3 + 4 5 R 1 F V Adds 0.7 mA 0.7 mA ISO 35V 49.9k IN914 *The high current drive will not support a short to ground. 12 9 8 7 4 3 CLK AND Specifications are subject to change without notice. PWR COM Figure 1. Clock Driver AD246 Pin Designations Pin (Y) Pin (N) Function 112 15 V Power In 21 Clock Output 12 14 Common 13 24 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 8.90 (0.350) AD246JN MAX FRONT VIEW 15.90 AD246JY SIDE 2.50 (0.100) (0.625) VIEW FRONT VIEW MIN 0.51 (0.020) 0.51 (0.020) MAX 0.25 (0.010) 0.38 (0.015) 0.38 (0.015) 3.70 (0.145) 2.50 0.25 (0.010) 27.90 (1.100) (0.100) 1.30 (0.050) MIN NOM 2.90 (0.115) 2.50 (0.100) 1 12 NOM 14.00 (0.550) 0.38 (0.015) 5.00 (0.197) 12.70 17.80 BOTTOM VIEW 0.25 (0.010) (0. 500) (0.700) 2.90 1 13 (0.115) 24 14 2.50 BOTTOM C L (0.100) VIEW 25.40 (1.000) 2 12 CONTROLLING DIMENSIONS ARE IN MILLIMETERS INCH DIMENSIONS CONTROLLING DIMENSIONS ARE IN MILLIMETERS INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. use, nor for any infringements of patents or other rights of third parties that Tel: 781/329-4700 www.analog.com may result from its use. No license is granted by implication or otherwise Fax: 781/326-8703 Analog Devices, Inc., 2002 under any patent or patent rights of Analog Devices.2 PRINTED IN U.S.A. C02934010/02(0)