INTRODUCTION
The CH1840 is an ultra small, low profile Data Access Arrange ment (DAA). Its modular construction and single +5 Volt D.C. power requirement simplify your development process. Specifically designed for both voice and data, this device allows direct connection of these circuits to the telephone lines. The CH1840 has FCC Part 68 registration that can be transferred to your product. Simply attach the included registration sticker to the outside of your product. This eliminates the costs and delays associated with Part 68 testing and registration.
The CH1840 has also been designed to meet the requirements of Canada’s Department of Communication (DOC). However, it is necessary to register your product with the DOC before use in Canada.
The CH1840 requires only 1.5 square inches of circuit board space and presents a profile of only 0.35 inches in height. This DAA can either be mounted directly on a printed circuit board or socketed. 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 compatible with the CH1817.

FEATURES
• Works with all modem chip sets
• Available in 0 dB, -6 dB, and -9 dB insertion losses
• Available in extended temperature operation, -40°C to +85°C
• Complete DAA function
• Voice and data
• FCC Part 68 registered
• Registration conveyed to user
• Hook switch control
• Ring detection
• Single +5V operation
• Pulse dial capability