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STA5630 bảng dữ liệu(PDF) 3 Page - STMicroelectronics |
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STA5630 bảng dữ liệu(HTML) 3 Page - STMicroelectronics |
3 / 7 page STA5630 Applications Doc ID 16055 Rev 1 3/7 1 Applications Three main applications cases are considered and described hereafter. The first uses a passive antenna and only a single RF SAW in front of the internal LNA. It targets low cost and medium performance applications. In this case LNA is ON and RFA is set at minimum gain. The second uses a passive antenna and two RF SAWs. It maximizes the performances in presence of severe blockers. In this case LNA is ON and RFA is set at maximum gain. The third case uses an active antenna. This solution targets applications where the GPS antenna is far from the RF front-end. In this case the signal can be fed into either LNA or RFA input depending on the application conditions. STA5630 is suitable for baseband requiring 16.368/4.092 clock/RF interface and one, two or three bits samples. It accepts reference clocks (TCXO) in the range of 10-52 MHz and delivers a TCXO buffered copy to the baseband. The STA5630 has two default modes selectable by an external pin (MODE): ● MODE 0: the chip is configured to use 16.368 MHz as reference frequency, ● MODE 1: the chip is configured to use 26 MHz as reference frequency. Other modes are programmed through the serial interface 1.1 Block diagram Figure 1. Block diagram Digital Interface CP Buffer PFD Image Rejection Mixer Complex IF filter GPS_CLK /48 or / 96 TCXO_CLK LNA_IN MAG1 SIGN / 2 / R 1 ÷ 63 SPI_NCS SPI_CLK SPI_DI SPI_DO <chip config > ADC TCXO TP_IF_N MAG1 AGC CHIP_EN LNA RFA RFA Selectable BW GPS BW = 2MHz GALILEO BW = 4MHz Selectable BW GPS BW = 2MHz GALILEO BW = 4MHz Digital Integrator 3 bits MAG0 Default Mode Selector MODE0: TCXO=16.368 MHz MODE1: TCXO=26 MHz RF_EN MODE F_LO = 3142.656 MHz F_IF = 4.092 MHz LNA_OUT RFA_IN VGA LDO V18_IN V12_OUT V12_RFOUT LNA_EN TP_IF_P / N 56 ÷ 2047 V18_IO |
Số phần tương tự - STA5630 |
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Mô tả tương tự - STA5630 |
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