RC22312A/RC32312A Evaluation Board Manual
R31UH0022EU0100 Rev.1.00
Mar 28, 2023
1.2.1.2. Power the Device with External Power Supply Connection and On-board Voltage Regulators
■
Set jumper on J124 between pins 2 and 3
■
Set jumper on J259 between pins 2 and 3
■
Ensure 5V at banana jack J123 and GND connection
Figure 4. External 5V Board Input
Figure 5. External 5V Schematic
Note: Allow for up to 2A of current with direct power supply. The device current will be increased during register
write and calibration.
1.2.1.3. Power the Device Pins with External Power Supply Connection J90
■
Ensure 1.8V or 3.3V at banana jack J90 and GND connection depending on the power pin
■
Change the corresponding domain jumper selection to V
DD
Figure 6. J90 Board Input
Figure 7. VDD Jumper Bypass Schematic
Note: J90 can supply voltage for the entire device. If all voltage pin jumper settings are configured for VDD and
the input voltage is 1.8V.
Note: All individual voltage domains run at 1.8V. Only VDDD33_SERIAL and VDDD33_DIA are compatible with
3.3V. Supplying 3.3V to any other domain may cause damage to the RC22312A/RC32312A device.
1.2.2. Overdrive the XIN with an External Signal
The RC22312A/RC32312A device can support between 25MHz–80MHz on the XIN (crystal oscillator input) pin.
There are four options for providing an input signal to the device XIN pin:
■
An external signal (J2 SMA connector) typically from a signal generator; see section 1.2.1). This option is
configured by default.
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An on-board crystal mount (U3); see section 1.2.2
■
Two on-board XO mounts (U27, U29); see section 1.2.3
To overdrive XIN with an external signal (see Figure 8):
1. Populate C1 with 0.1µF capacitor to ensure that J2 has a connected path to the RC32312A device.
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