XR-2123

XR-2123/2123A PSK ModulatorIDemodulator GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAMS This series of devices provide the modulator and demodulator for phase-shifted keyed modulated signals. The devices have an on-chip digital-to-analog converter, allowing digital external programming of Bell 212A, CCITT V.22 or V.26 functions. The XR-2123 provides the modulator and demodulator functions. It is adequate for Bell 212A (1200 BPS only) and Bell 201 standards. The XR-2123 requires a synchronous-to-asynchronous converter and scrambler-descrambler for the digital portion of the modem for 212A applications. Level shifters and filtering is required for the analog portion. The X R-2123A provides the ±7 Hz carrier capture range needed for V.22 and V.26. It is externally identical to the XR-2123. The XR-2123 and XR-2123A utilize CMOS technology for power operation while providing single 5 volt operation. Both devices come in a 28 pin DI L pin package in either plastic or ceramic. FEATURES Sin...