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CX74001 датащи(PDF) 4 Page - Skyworks Solutions Inc. |
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CX74001 датащи(HTML) 4 Page - Skyworks Solutions Inc. |
4 / 23 page CX74001 Rx ASIC for CDMA, AMPS, and PCS Applications 4 Skyworks 101134A Proprietary Information and Specifications are Subject to Change March 5, 2002 Table 1. CX74001 Pin Assignments and Signal Descriptions (1 of 4) Pin # Name Description Equivalent Circuit 1 LNA_CTRL1 Digital signal used in conjunction with pin 3 to control LNA gain step. DO NOT ALLOW TO FLOAT OR LEAVE UNCONNECTED Vcc 2 PCS_LNAIN PCS LNA input pin. High-Q matching network should be used to minimize noise figure, and a DC blocking capacitor is required. 3 LNA_CTRL0 Digital signal used in conjunction with pin 1 to control LNA gain step. DO NOT ALLOW TO FLOAT OR LEAVE UNCONNECTED Vcc 4 CELL_LNA_IN Cellular LNA input pin. High-Q matching network should be used to minimize noise figure, and a DC blocking capacitor is required. 5 VCC_RF_BIAS Supply voltage to the RF bias (needed by all LNA/Mixer blocks) . An RF bypass capacitor should be connected from the pin to ground with minimal trace length. 6 CELL_LNA_EMIT Ground directly to ground with minimum trace length. 7 CELL/PCS Digital signal used for band selection: 0 = cellular (800 MHz), 1 = PCS (1900 MHz). 8 FM/CDMA Digital signal used in cellular band for mode selection: 0 = AMPS, 1 = CDMA. 9 VCO_VCC Voltage supply to the VCO buffers. A bypass capacitor should be placed close to the device from pin 9 to ground with minimal trace length. 10 VCO_ON VCO control signal to turn VCO and PLL buffer ON/OFF during slotted paging modes, thereby increasing standby time. 11 CELL_TANK– Differential tank cellular band VCO pin. Care should be taken during the layout of the external tank circuit to prevent parasitic oscillations. 12 CELL_TANK+ Differential tank cellular band VCO pin. Care should be taken during the layout of the external tank circuit to prevent parasitic oscillations. 13 PCS_TANK– Differential tank PCS band VCO pin. Care should be taken during the layout of the external tank circuit to prevent parasitic oscillations. 14 PCS_TANK+ Differential tank PCS band VCO pin. Care should be taken during the layout of the external tank circuit to prevent parasitic oscillations. – + 15 LOD Linearity On Demand. It provides the bias control for the mixers, thereby reducing the chip current consumption at the expense of input IP3. |
Аналогичный номер детали - CX74001 |
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Аналогичное описание - CX74001 |
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