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STCD1040 Scheda tecnica(PDF) 11 Page - STMicroelectronics |
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STCD1040 Scheda tecnica(HTML) 11 Page - STMicroelectronics |
11 / 40 page STCD1020, STCD1030, STCD1040 Application information 11/40 3 Application information 3.1 Typical applications The STCD1020, STCD1030 and STCD1040 distribute a source clock (for example, from VCTCXO) to 2, 3 or 4 channel outputs. The typical application circuits using STCD1040 are shown in Figure 7 and Figure 8 below. In Figure 7, the clock from VCTCXO is distributed to the TD-SCDMA transmitter and receiver and GSM transceiver separately. In Figure 8, the buffer #4 output is fed into the Bluetooth system. In order to allow minimum power consumption, a Bluetooth system always has a clock request feature. If the Bluetooth system does not require the clock, the clock request will disable the clock output. The enable pins can also be connected to logic high to let the channel output always on. If the channels of STCD1020, STCD1030 and STCD1040 are not used in the application, the enable pins of the channels should be connected to ground on PCB. Figure 7. Typical application circuit using STCD1040 for RF ends of TD- SCDMA/GSM dual mode mobile phone STCD1040 VCTCXO VCC MCLK GND EN4 VCC EN3 EN2 EN1 CLK1 CLK2 CLK3 CLK4 ai13954 Mode selection TD-SCDMA transmitter TD-SCDMA receiver GSM transceiver |
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