CH1840 - Low Profile Data Access Arrangement (DAA) Modules

The operation of the CH1840 can be broken down into the functional blocks shown in Figure 1.

1) Phone line control 2) Billing delay 3) Ring detection 4) Signal Path 5) 2- to 4-wire converter Control inputs and status outputs for the CH1840 are compatible with 5 Volt CMOS.

• Works with all modem chip sets Available in 0 dB, -6 dB, and -9 dB insertion losses Available in extended temperature operation, -40oC to +85oC 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.