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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 14
1C
2 RC
3R
49.9k
65
CD
4947B
10 2
Q
4
12 9 8 7 4
6
TELEDYNE
TSC426
3
IN914
7
5
IN914
Figure 1. Clock Driver
15V
CLKOUT
+ 1F
35V
CLK AND
PWR COM
AD246 SPECIFICATIONS
(Typical @ 25C and VS = 15 V, unless otherwise noted.)
Model
AD246JY
AD246JN
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
15 V ± 5%
35 mA
2.2 mA
0.7 mA
15 V ± 5%
35 mA
2.2 mA
0.7 mA
*The high current drive will not support a short to ground.
Specifications are subject to change without notice.
AD246 Pin Designations
Pin (Y)
1
2
12
13
Pin (N)
12
1
14
24
Function
15 V Power In
Clock Output
Common
Common
OUTLINE DIMENSIONS
AD246JY Package
Dimensions shown in inches and (millimeters)
AD246JN Package
Dimensions shown in inches and (millimeters)
25.30 (0.995) MAX
8.40 (0.330) MAX
AD246JY
FRONT VIEW
15.90
(0.625)
MAX
SIDE
VIEW
2.50
(0.100)
MIN
1.30 (0.050)
NOM
2.90 (0.115)
14.00 (0.550)
5.00 (0.197)
0.38 (0.015)
0.25 (0.010)
2.90
(0.115)
CL
1
BOTTOM
VIEW
13
2 12
2.50
(0.100)
0.38 (0.015)
0.25 (0.010)
2.50 (0.100)
NOM
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.
36.70 (1.445) MAX
2.50 (0.100)
MIN
3.70 (0.145)
1
AD246JN
FRONT VIEW
0.51 (0.020)
0.25 (0.010)
8.90 (0.350)
MAX
0.51 (0.020)
0.38 (0.015)
27.90 (1.100)
12
12.70
(0. 500)
BOTTOM VIEW
17.80
(0.700)
24
25.40 (1.000)
14
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
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

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