STCD22-0 datasheet(5/39 Pages) STMICROELECTRONICS

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STCD22x0, STCD23x0, STCD24x0

Description

Doc ID 15400 Rev 2

5/39

Description

The STCD22x0, STCD23x0 and STCD24x0 are 2, 3 or 4 output clock distribution circuits

which accept external square wave or sine wave signals and output rail-to-rail (0 V to

VTCXO) square wave signals. They are used to provide a common frequency clock to

multimode mobile RF applications. They can also be used for those baseband peripheral

applications in mobile phones such as WLAN, Bluetooth, GPS and DVB-H as the clock

reference. The STCD22x0, STCD23x0 and STCD24x0 isolate each device driven by their

clock outputs and minimize interference between the devices. Each of the clock buffers can

be disabled to lower the power consumption whenever the connected device does not need

the clock. The STCD22x0, STCD23x0 and STCD24x0 accept commonly used mobile

master clock frequencies ranging from 10 MHz to 52 MHz.

The STCD22x0, STCD23x0 and STCD24x0 have a common clock request (open drain

output, active low) controlling the external clock source. A 1.8 V, high PSRR LDO is also

integrated in the STCD22x0, STCD23x0 and STCD24x0 to supply power to the external

clock source (for example, TCXO). STMicroelectronics offers different versions for the

enable polarities. The STCD22x0, STCD23x0 and STCD24x0 are available in, respectively,

1.2 mm x 1.6 mm (12-bump), 1.2 mm x 1.6 mm (12-bump) and 1.6 mm x 1.6 mm (16-bump)

chip scale packages and can be operated with a battery supply voltage ranging from 2.5 V

to 5.1 V. The operating temperature is –20 to +85 °C.

STCD22-0 数据表(PDF) 5 Page - STMicroelectronics