ch1840 ETC-unknow, ch1840 Datasheet
ch1840
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ch1840 Summary of contents
Page 1
... Connection is made through 0.025 inch square pins on 0.10 inch centers. The telephone line connection is made through a user supplied RJ-11 jack. The CH1840 DAA is designed for use with a variety of voice circuitry and LSI modem/fax chip sets. This device is ideal for fax and modem applications up through V.32bis. The CH1840 is pin com- patible with the CH1817 ...
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... Drawing current from the local loop signals the central office that the telephone is Off Hook, that is, either answering a call or prepar- ing to place a call. In the CH1840, this function is controlled by the OFFHK signal. When this input is LOW, the CH1840 is On-Hook, indicating to the central office it is not using the line. The CH1840 can pulse dial by toggling the OFFHK input ...
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... N/C - Not Used. Please leave unconnected. OFF HOOK, Input. When set Low, the CH1840 is placed on-Hook. When set HICH, the CH1840 is placed Off-Hook to answer or place a call. This input can also be used for pulse dialing. NOTE: When answering incoming calls in response to 4 OFFHK ...
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... No additional application circuitry should be connected be- tween the CH1840 and the phone line RJ-11C jack, except as described in note 10 below. 8) The registration label included with the product must be affixed to the outside of your product where it is easily visible to your end user ...
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... Many socket manufac- turers offer socket strips that accept the 0.025 inch square pins on 0.10 inch centers. When using mechanical sockets, restraint of the CH1840 should be provided to keep it seated during ship- ment. Plastic cablewraps are secure yet easily removed. FOR YOUR USER’S MANUAL ...
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... Z FCC Registration Number Ringer Equivalence REN TIMERS Ring Detection Delay T Billing Delay Timer T Hook Switch Power Supply Current I © 2000 Cermetek Microelectronics, Inc. Table 2 CH1840 DAA Electrical Specifications T = 0ºC to 55ºC unless otherwise specified A CONDITIONS 0.2mA ...
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TASMAN DRIVE · SUNNYVALE, CALIFORNIA 94089 · TEL: (408) 752-5000 FAX: (408) 752-5004 Cermetek reserves the right to make changes in specifications at any time and without notice. The information furnished by Cermetek in this publication is believed to ...