CDB43131-GBK
DS1155V2DB1
5
2.1 Power Supply Circuitry
The CDB43131 board is powered from a 5-volt, 1.2-amp AC adapter or via the +5-volt bus from the USB connector. All
the supply rails for both the smart codec and the CS43131s are generated using a combination of switched-mode power
supplies (switchers) and LDOs. In addition to these internal supplies, the CDB43131 board also provides the option of
powering the CS43131 supply rails from external bench supplies via banana jacks.
The switchers and LDOs step down the +5 V supply to 3.6 V, 3.3 V, 1.0 V, 1.8 V (analog), and 1.8 V (digital) levels.
If the device is set into External VCP_FILT Supply Mode and bypass the internal Class-H charge pump circuit, then a ±3-
volt supply must be applied to V and VCP_FILT-. The banana jacks are connected to each device through a set
of resistors (R24/R25 for the CSP device, and R40/R41 for the QFN device). These resistors are unpopulated by default
and will need to be populated with a 0-
Ω resistor to connect the jack to the DUT.
Figure 5 CDB43131 Power Supplies
