ST7590

Analog front end (AFE)

Doc ID 18349 Rev 1

17/24

Figure 7.

Power supply internal scheme

4.8

Clock management

The main clock source is an 8 MHz crystal connected to the internal oscillator through XIN

and XOUT pins. Both XIN and XOUT pins have a 32 pF integrated capacitor, in order to

drive a crystal having a load capacitance of 16 pF with no additional components.

Alternatively, an 8 MHz external clock can be directly supplied to XIN pin, leaving XOUT

floating.

A PLL internally connected to the output of the oscillator generates the internal clocks

needed by the digital part.

LDO

VCC

VSS

VCCA

VSSA

LDO

VDDIO

GND

VDD

VSSA

VDD_PLL

8-18V

External Supply

3.3 or 5V

External Supply

POWER AMPLIFIER

AFE

DIGITAL INTERFACES

DIGITAL CORE

INTERNAL PLL