Analog Devices AD246 Datasheet

a

FRONT VIEW

AD246JN

36.70 (1.445) MAX

2.50 (0.100)
MIN

8.90 (0.350)
MAX

0.51 (0.020)

0.25 (0.010)

3.70 (0.145)

0.51 (0.020)

0.38 (0.015)

1 12

1424

BOTTOM VIEW

27.90 (1.100)

25.40 (1.000)

12.70

(0. 500)

17.80

(0.700)

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

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.
circuit shown in Figure 1 (essentially an AD246)

can operate at

The

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.

+

1␮F
35V

15V

CLKOUT

CLK AND
PWR COM

180pF

49.9k⍀

14

6

CD

4947B

5

2

10

Q

4

4789

1

C

2

RC

3

R

12

6

TELEDYNE

TSC426

3

IN914

7

5

IN914

Figure 1. Clock Driver

AD246 SPECIFICATIONS
(Typical @ 25∞C and V

= 15 V, unless otherwise noted.)

S

Model AD246JY AD246JN

OUTPUT*

Frequency 25 kHz Nominal 25 kHz Nominal
Voltage 15 V p-p Nominal 15 V p-p Nominal
Fan Out 32 max 32 max

POWER SUPPLY
REQUIREMENTS

Input Voltage 15 V ± 5% 15 V ± 5%
Supply Current

Unloaded 35 mA 35 mA
Each AD204 2.2 mA 2.2 mA
Adds 1 mA
Load on AD204

or

+V

ISO

–V

Adds 0.7 mA 0.7 mA

ISO

*The high current drive will not support a short to ground.
Specifications are subject to change without notice.

AD246 Pin Designations

Pin (Y) Pin (N) Function

11215 V Power In
21Clock Output
12 14 Common
13 24 Common

AD246JY Package

Dimensions shown in inches and (millimeters)

25.30 (0.995) MAX

AD246JY

FRONT VIEW

2.50

(0.100)

MIN

5.00 (0.197)

2.90

(0.115)

C

L

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.

1

2

1.30 (0.050)
NOM

14.00 (0.550)

BOTTOM

VIEW

13

12

2.90 (0.115)

0.38 (0.015)

0.25 (0.010)

2.50
(0.100)

(0.625)

8.40 (0.330) MAX

15.90

SIDE
VIEW

MAX

OUTLINE DIMENSIONS

0.38 (0.015)

0.25 (0.010)

2.50 (0.100)
NOM

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] www.analog.com
Fax: [phone] © Analog Devices, Inc., 2002

AD246JN Package

Dimensions shown in inches and (millimeters)

C02934–0–10/02(0)

–2–

PRINTED IN U.S.A.