XR-215

XR-210 : www.DataSheet4U.com .

XR-2103 : The XR-2103 is a Monolithic Switched-Capacitor Filter designed to perform the complete filtering function necessary for a Bell 103 Compatible Modem. The XR-2103 is specifically intended for use with the XR-14412 ModulatorlDemodulator to form a complete stand alone two-chip modem. I n addition to complete high and low bandpass filters, the XR-2103 contains internal mode switching, auto-zeroing limiter and dedicated duplexer op amp. An on board carrier detect circu it is also included to complete the overall system. Designed for crystal-controlled operation, the X R2103 operates from a 1.0 M Hz crystal or external clock. Buffered clock output is provided for the X R-14412. A self-test circuit .

XR-2120 : FUNCTIONAL BLOCK DIAGRAM The X R-2120 is a self-contained bandpass fi Iter set designed for realization of Bell 212A compatible 1200 bits/sec PSK modems. The XR-2120 utilizes CMOS technology and switched capacitor circuit techniques to minimize external components to a single crystal or frequency source. Contained in the device are two complete bandpass filters centered around the Bell standard 1200 Hz and 2400 Hz send and receive frequencies. These filters also provide compromise line equalization. Additional features included are digitally programmable transmit and receive gains as well as input anti-aliasing and complete output smoothing filters. Separate VSS pins for transmit, receive,.

XR-2120A : The XR-2120A is a filter system for performing the complete filter function for Bell 212A or CCITI V.22 type modems. The XR-2120A supplies both transmit and receive filtering functions for the standard 1200 Hz and 2400 Hz 212A1V.22 carrier frequencies. Also supplied are mode switching, internal clock generators, input anti-aliasing filters, output reconstruction filters, and digitally controlled transmit and receive gains. Additional features included are CCITI notch filters, additional pin selectable equalization for worst case phone lines and complete analog loopback function. The XR-2120A utilizes silicon gate CMOS technology and switched-capacitor circuit techniques to minimize external .

XR-2121 : The, XR-2121 is designed to provide the complete modulator function for a Bell 212A type modem. The circuit accepts a synchronous serial data stream and generates either a 300 BPS frequency shift keyed (FSK) or a 1200 BPS differential phase shift keyed (DPSK) carrier signal. An on-board digital-to-analog converter provides a synthesized sine wave output. Also provided on the transmitted carrier output is an inverting amplifier with external feedback resistor to provide a carrier amplitude adjust. The XR-2121 contains an internal 17 bit scrambler. This scrambler which is used during DPSK operation has a disable input for sending non-scrambled carriers. A 1200 Hz transmit clock output is pr.

XR-2122 : The XR-2122 is designed to perform the complete Bell 212A type modem demodulator function. Both 1200 BPS differential phase shift keyed (DPSK) and 300 BPS frequency sh ift keyed carrier demodu lation is performed by the XR-2122. The 1200 BPS portion utilizes coherent demodulation. while the 300 BPS uses phase-locked loop techniques. For 1200 BPS operation. an internal 17 bit descrambler provides the descrambled output with the nondescrambled output also available. Automatic speed selection is performed by a handshake circuit. Carrier detect outputs are supplied for FSK data. PSK data. and conventional energy detection. A non-committed operational amplifier is supplied to provide receive c.

XR-2123 : 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.

XR-2123A : 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.

XR-2125 : XR-2125 Data Buffer GENERAL DESCRIPTIDN The X R-2125 is a logic circu it designed to perform the data buffer function for Bell 212A Type Modem Systems. Both asynchronous to synchronous and synchronous to asynchronous conversion are performed at nominal data rates of 1200 bits per second. The XR-2125 is selectable for character lengths of 9 or 10 bits. Separate enable/d isable inputs are supplied for async to sync and sync to async converter sections. These inputs allow the same data lines to be used for asynchronous or synchronous operation. The receive data buffer section (sync to async) accepts input sync data (typically from the modem demodulator) at 1200 BPS and converts it to a 1219 B.

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XR-2135A : .

XR-215A : The XR-215A is a highly versatile monolithic phaselocked loop (PLL) system designed for a wide variety of applications in both analog and digital communication systems. It is especially well suited for FM or FSK demodulation, frequency synthesis and tracking filter applications. The XR-215A can operate over a large choice of power supply voltages ranging from 5V to 26V and a wide frequency band of 0.5Hz to 25MHz. It can accommodate analog signals between 300mV and 3V. ORDERING INFORMATION Part No. XR-215ACP XR-215ACD Package 16 Lead 300 Mil PDIP 16 Lead SOIC (Jedec, 0.300”) Operating Temperature Range 0°C to 70°C 0°C to 70°C Rev. 1.01 E1996 EXAR Corporation, 48720 Kato Road, Fremont, C.