STCD1020 datasheet(11/40 Pages) STMICROELECTRONICS

11 / 40 page

STCD1020, STCD1030, STCD1040

Application information

11/40

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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