FX589 Datasheet | CML

Features Full-Duplex Gaussian Minimum Shift Keying (GMSK) Operating from 3 Volts to 5.5 Volts Data Rates 4kb/s to 64kb/s Selectable BT (0.3 or 0.5) Low-Current Analogue/Digital Non-DSP Solution Meets RCR STD-18 Applications Wireless LAN/Modems Handy Data Terminals Low-Power Wireless Data Link for PCs, Laptops and Printers Point-Of-Sale Terminals Wireless Bar-Code Readers and Stock Controllers Tx ENABLE Tx PS Tx DATA XTAL/CLOCK DATA RETIME & LEVEL SHIFT VBIAS Tx FILTER VBIAS Tx OUT Tx CLOCK XTAL Clk DIVA Clk DIVB CLOCK DIVIDER Rx Hold PLLacq Rx DCacq Rx CIRCUIT CONTROL Rx PS Rx SIGNAL IN VBIAS + - Rx FEEDBACK Fig.1 Functional Block Diagram Rx FILTER Rx DATA EXTRACT Rx S/N DETECTION Rx CLOCK EXTRACT Rx LEVEL MEASURE DOC1 DOC2 Rx DATA Rx S/N Rx CLOCK VDD VSS VBIAS Brief Description The FX589 is a single-chip modem employing Gaussian Minimum Shift Keying (GMSK) modulation. Data rates of 4kb/s to 64kb/s and the choice of BT to 0.3 or 0.5 are pin-programmable functions to suit radio data channel bandwidth requirements. The Rx and Tx digital data interfaces are bit-serial and synchronised to Rx and Tx data clocks generated by the modem. Separate Rx and Tx Powersave/Enable inputs allow for full- or half-duplex operation. Rx input levels can be set by a suitable ac and dc level adjusting circuit built, with external ponents, around an on-chip Rx input amplifier. Acquisition, lock and hold of Rx data signals is made easier and faster by the use of Rx Control Inputs to clamp, detect and/or hold input data levels and can be set by the system µProcessor as required. Indication is available, from the Rx S/N output, as to the quality of the received signal. The FX589 design features a low-current analogue/digital ASIC process offering significantly lower current consumption than DSP technology. For data rates up to 32kb/s the FX589 draws typically 1.5m A at 3.0 volts V and DD for data rates up to 64kb/s at 5.0 volts, typically 4.0m A. This low-power...