Si5338-EVB
2
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
Rev. 1.5 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • December 14, 2021
1. Functional Block Diagram
A functional block diagram of the EVB is shown in Figure 1. The MCU performs the USB to I
2
C conversion,
controls the voltage regulators, monitors the INTR pin, and controls the four status LEDS. It also provides control of
the eight input pins when the INx_CTRL jumpers are populated. There are five programmable voltage regulators
(VDD, VDDO0, VDDO1, VDDO2, VDDO3), which supply power to the Si533x device. VDD and VDDO jumpers
allow the option of powering the device from external supplies, or as a convenient point for measuring current. I
2
C
jumpers allow disconnection of the Si533x device from the I
2
C bus to allow external control from another I
2
C
master.
For the Si5334, Si5335, and Si5338 devices, the EVB is shipped with an onboard 25 MHz XTAL to allow stand-
alone asynchronous operation. For Si5335 emulation, synchronization to an external reference is done via IN1 and
IN2. Removal of the XTAL and addition of two 0 ohm resistors is required. IN3, IN4, IN5, and IN6 are not available
as external clock inputs for Si5335.
Figure 1. EVB Functional Block Diagram
XTAL
MCU
USB
Connector
0
* indicates unpopulated components
IN1
0
IN2
IN5
IN6
IN3
IN4
*
*
CLK0A
CLK0B
VDDO0
VReg
VReg
VReg
VReg
CLK1A
CLK1B
VDDO1
term
*
term
*
term
*
term
*
CLK2A
CLK2B
VDDO2
term
*
term
*
CLK3A
CLK3B
VDDO3
term
*
term
*
Si5338
VReg
term
*
term
*
VDD
To
I2C
Bus
IN7/SCL
IN8/SDA
INx_CTRL
Jumpers
I2C B
us
To
I2C
Bus
Status
LEDs
Reset
Switch
VDDO
Jumpers
INTR
I2C
Jumpers
VDD
Jumpers
