CH1786

CH1786 Family of Ultra Small 2400bps Modems INTRODUCTION The CH1786 family of modems are a full function, FCC Part 68 approved 2400bps modem. These modems provide a fast, easy and flexible way to integrate a modem into any OEM product while utilizing the minimum amount of PCB space (1.01 ”x 1.27 ”x 0.52 ”). The CH1786 family only requires two external interfaces: a CCITT V.24 serial interface that can be routed directly to a UART, and a Tip and Ring interface which goes directly to an RJ-11 jack for the PSTN line connection. The CH1786 can be controlled with industry standard AT commands and, hence, is compatible with available industry communication software. All CH1786 modems support asynchronous operation at 2400bps, 1200bps, and 300bps to both Bell and CCITT standards. The resident PSTN line interface, or Data Access Arrangement (DAA), while being FCC approved, is also Canadian DOT approvable and can be approved in other countries that require 1500VAC RMS isolation requirements per UL 1950 Edition 3. The CH1786 family of modems operate off a single 5volt supply. The low power operation and automatic standby mode make these modems ideally suited for portable equipment. In addition, their small physical size affords maximum flexibility in equipment design. FEATURES Supports Standards 212,and Bell 103 CCITT V.22bis,V.22,Bell FCC Part 68 approved and DOT CSA CS-03 Part I approvable UL 1950 and CSA C22.2 950 Listed UL File Number: E104957 AT Command structure wi...