Skyworks Si53208, Руководство пользователя

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2.2 Voltage Selection for Non-Output Supplies (VDD, VDDA, and VDD_AUX)
The nominal voltage setting for all but VDD_IO is controlled by the VDD Voltage Level Control switch SW1 as shown in Figure 2.1 2.1.
Location of EVB Power and Voltage Switches and Jumpers on page 4 . Positioning the switch in the open position selects 1.5 V for
all these supplies and positioning the switch in the closed position selects 1.8 V. Jumpers JP1-JP3 should be installed if the on-board
regulator is desired. Alternatively, and external voltage source can be connected to an individual supply by removing the corresponding
jumper and connecting the (+) voltage of the supply to pin 2 of the jumper and (-) voltage to GND (TP13). Note that pin 1 of the jumpers
is identified by the highlighted square.
2.3 Voltage Selection for Output Supply (VDD_IO)
The nominal voltage setting for VDD_IO is controlled by the VDD_IO Voltage Level Control switch SW2 as shown in Figure 2.1. The
table below shows the switch settings for nominal voltages: +1.8 V, +1.5 V, +1.2 V, and +1.0 V. Please note that only one switch should
be in the “closed” position at any given time. Multiple closed switches at the same time could lead to part damage. Jumper JP4 should
be installed if the on-board regulator is desired.
Alternatively, an external voltage source can be connected to this individual supply by removing JP4 and connecting the (+) voltage of
the supply to pin 2 of the jumper and (-) voltage to GND (TP13). Note that this is an excellent way to test the PSRR performance of the
part, as the dc supply can be modulated with a sinusoidal (noise) waveform and inserted on JP4, pin 2.
Table 2.1. Switch 2 Settings for Output Voltage Supply
SW2-1 SW2-2 SW2-3 VDD_IO
OPEN OPEN OPEN 1.0V
CLOSED OPEN OPEN 1.2V
OPEN CLOSED OPEN 1.5V
OPEN OPEN CLOSED 1.8V
2.4 Measuring Supply Currents (IDD, IDD
A
, and IDD
IO
)
Measuring the current on any supply rail can be performed by measuring the voltage between test points VDD
X
and VDD
X
_PIN.
There is a precision (±100 ppm) 1 ohm resistor between these two test points. Therefore, whatever voltage is measured maps to the
equivalent current measurement (e.g., 30 mV -> 30 mA)
UG337: Si53208-EVB User’s Guide • Power Supply Switch Settings
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
5 Rev. 0.1 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • July 26, 2021 5