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Application Note 9871
TABLE 8. BASIC APPLICATION CIRCUIT COMPONENT LIST (Continued)
COMPONENT
R7 (RSYNC_REV resistors) R = 3.47k/ μ s (10 μ s)
R8 (RZT, 2-Wire Impedance Matching Resistor) R = 200(ZO-2RF)
Z0 = 600 ? , RF = 30 ?
R9 (Current Limit Resistor for Ring Sync Pulse)
R10 (RSYNC_REV resistor) R = 3.47k/ μ s (2 μ s)
R11 (Series Resistor to simulate loop length during ringing)
R12 (Sense Resistor for DC current during ringing)
R13 (R PS , Power Sharing Resistor)
R14, R15 (Transhybrid Resistors)
R16, C13 (For matching a complex 2-Wire impedance)
VALUE
34.8k ?
107k ?
49.9k ?
69.8k ?
600 ?
400 ?
Open
10k ?
R = 0 ?
TOLERANCE
1%
1%
1%
1%
1%
1%
-
1%
-
RATING
1/16W
1/4W
1/16 W
1/16 W
2W
2W
-
1/16W
-
C13 = Open
R17, R18 (Current Limiting Resistors for LEDs)
C1, C5
C2
C3
C4, C7
C6
C8, C9
C10, C12
C11
D1, D2 (SHD and GKD_LVM LEDs)
D3, Recommended if the V BL supply is not derived from the V BH
510
0.01 μ F
0.1 μ F
4.7 μ F
0.47 μ F
0.01 μ F
2200pF
0.1 μ F
0.1 μ F
Red
1N4004
5%
20%
20%
10%
20%
20%
20%
20%
20%
-
-
1/4W
50V
10V
50V or (V BH /2)
10V
100V
100V
50V
100V
-
-
supply.
Design Parameters : Switch Hook Threshold = 12mA, Loop Current Limit = 30mA, Synthesize Device Impedance = 600-60 = 540 ? , with 30 ?
protection resistors, impedance across Tip and Ring terminals = 600 ? . Where applicable, these component values apply to the Basic Application
Circuits for the HC55120, HC55121, HC55130, HC55140, HC55142 and HC55150. Pins not shown in the Basic Application Circuit are no connect
(NC) pins.
All Intersil products are manufactured, assembled and tested utilizing ISO9000 quality systems.
Intersil Corporation’s quality certi?cations can be viewed at website www.intersil.com/quality/iso.asp.
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design and/or specifications at any time without notice.
Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. How-
ever, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use.
No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see web site www.intersil.com
Sales Of?ce Headquarters
NORTH AMERICA
Intersil Corporation
P. O. Box 883, Mail Stop 53-204
Melbourne, FL 32902
TEL: (321) 724-7000
FAX: (321) 724-7240
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ASIA
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Taipei, Taiwan 104
Republic of China
TEL: 886-2-2515-8508
FAX: 886-2-2515-8369
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