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| 19-5029; Rev 0; 12/09 AISG Integrated Transceiver General Description The MAX9947 is an AISG-compliant, fully integrated transceiver. The MAX9947 receiver offers a typical dynamic range of 20dB and integrates a bandpass filter that operates in the 2.176MHz frequency with a narrow 200kHz bandwidth. The MAX9947 transmitter integrates a bandpass filter that is compliant with the AISG spectrum emission profile. It can modulate OOK signals up to 115.2kbps. The output power can be varied with external resistors from +7dBm to +12dBm to compensate for loss in the external circuitry and cabling. The MAX9947 also features a direction output to facilitate the RS-485 bus arbitration in tower-mounted equipment. The MAX9947 is available in a small, 3mm x 3mm 16-pin TQFN and is rated for operation in the -40C to +85C temperature range. Features S Receiver Wide Input Dynamic Range -15dBm to +5dBm in 50I S Variable Transmitter Output Level from +7dBm to +12dBm S AISG-Compliant Output Emission Profile S Autodirection Output S No Need of Microcontrollers to Handle Bus Arbitration in Tower-Mounted Equipment S Supports All AISG Data Rates 9.6kbps 38.4kbps 115.2kbps S Bandpass Filter Compliant with AISG Protocol Centered Around 2.176MHz S 3.0V to 5.5V Voltage Supply S Independent Logic Supply S Small, 3mm x 3mm 16-Pin TQFN Package MAX9947 Applications Base Stations Tower Equipment Ordering Information PART MAX9947ETE+ TEMP RANGE -40NC to +85NC PIN-PACKAGE 16 Thin QFN-EP* TOP MARK AFH +Denotes a lead(Pb)-free/RoHS-compliant package. *EP = Exposed pad. Connect EP to GND to enhance thermal dissipation. Functional Diagram RES VL VCC XTAL1 XTAL2 TXIN DIRMD1 DIRMD2 DIRECTION DETECTION STATE MACHINE ANALOG SWITCH BIAS +7dBm TO +12dBm 1.5V TXOUT BANDPASS FILTER SYNCOUT DIR REF -15dBm MAX9947 RXOUT RXIN OOK DEMODULATOR GND BANDPASS FILTER _______________________________________________________________ Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com. |
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