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STCD1040 Scheda tecnica(PDF) 11 Page - STMicroelectronics

Il numero della parte STCD1040
Spiegazioni elettronici  Multi-channel clock distribution circuit
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
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STCD1040 Scheda tecnica(HTML) 11 Page - STMicroelectronics

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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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