Datasheet

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4 Power Supplies
4.1 Stand-Alone Operation
4.2 USB-MODEVM Interface Power
Power Supplies
Note that J5 comprises the signals needed for an I
2
S™ serial digital audio interface; the control interface
( I
2
C™ and RESET) signals are routed to J4. I
2
C is actually routed to both connectors; however, the device
is connected only to J4.
J3 provides connection to the common power bus for the TLV320DAC32EVM. Power is supplied on the
pins listed in Table 4 .
Table 4. Power Supply Pin Out
SIGNAL PIN NUMBER SIGNAL
NC J3.1 J3.2 NC
+5VA J3.3 J3.4 NC
DGND J3.5 J3.6 AGND
DVDD (1.8V) J3.7 J3.8 NC
IOVDD (3.3V) J3.9 J3.10 NC
The TLV320DAC32EVM-PDK motherboard (the USB-MODEVM Interface board) supplies power to J3 of
the TLV320DAC32EVM. Power for the motherboard is supplied either through its USB connection or via
terminal blocks on that board.
When used as a stand-alone EVM, power can be applied to J3 directly, making sure to reference the
supplies to the appropriate grounds on that connector.
CAUTION
Verify that all power supplies are within the safe operating limits shown on the
TLV320DAC32 data sheet before applying power to the EVM.
The USB-MODEVM Interface board can be powered from several different sources:
• USB
• 6VDC-10VDC AC/DC external wall supply (not included)
• Lab power supply
When powered from the USB connection, JMP6 should have a shunt from pins 1–2 (this is the default
factory configuration). When powered from 6V-10VDC, either through the J8 terminal block or J9 barrel
jack, JMP6 should have a shunt installed on pins 2–3. If power is applied in any of these ways, onboard
regulators generate the required supply voltages and no further power supplies are necessary.
If lab supplies are used to provide the individual voltages required by the USB-MODEVM Interface, JMP6
should have no shunt installed. Voltages are then applied to J2 (+5VA), J3 (+5VD), J4 (+1.8VD), and J5
(+3.3VD). The +1.8VD and +3.3VD can also be generated on the board by the onboard regulators from
the +5VD supply; to enable this configuration, the switches on SW1 need to be set to enable the
regulators by placing them in the ON position (lower position, looking at the board with text reading
right-side up). If +1.8VD and +3.3VD are supplied externally, disable the onboard regulators by placing
SW1 switches in the OFF position.
Each power supply voltage has an LED (D1-D7) that lights when the power supplies are active.
SLAU201 – November 2006 TLV320DAC32EVM and TLV320DAC32EVM-PDK 5
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