American Audio COMMANDER PLUS - REV 1-2 Betriebsanweisung PDF herunterladen (Seite 9)

UG-196-02-C

196-02-C - DA7322 Audio Codec with DSP

User guide UG-196-02-C

Revision 0.6

15-September-2014

CFR0011-121-00 Rev 1

9 of 21

Short 2-3

Inserts a 32Ω load across the left headphone output for test

purposes

J33

Pin:1

External supply connection point for SPK_VDD supply, used

by class D amplifiers.

Pin:2

GND connection for connecting external supply between Pin 1

(SPK_VDD supply to class D amplifiers) and Pin 2 GND

J34

Speaker A output connector from class D speaker output

J35

Speaker B output connector from class D speaker output

Power supplies 5.3

The DA7322 EVB is connected to the digital IO board via the large 100 pin connector (J27) which

allows the boards to mate together, The boards are powered when a USB cable is connected to J1

(+5V_USB) on the digital IO board.

Using the default jumper settings (J18, J19, J20 and J25 on EVB) shown in Figure 3, the DA7322

device on the EVB is powered from the supplies on the digital IO board. The two supplies used from

the digital IO board are 1V6_DIO (supply for VDD) and IOVDD_DIO (supply for IOVDD & AOVDD).

The IO supply is user selectable on the digital IO board depending on what IO voltage is required.

100 pin EVB connector,

power originates from

Digital IO board

SPK_VDD to power

on board class D

amplifiers

VDD to device

AOVDD to device

IOVDD to device

Figure 3: DA7322 supplies and connections on EVB

The DA7322 EVB allows external supplies to power the board by removing J18 and J25 jumpers.

Supplying power to Pin 2 and ground on Pin 3 of J18 and J25 allows the board to be powered

independently of the digital IO board. Current measurements on individual supplies can also be

performed by connecting an ammeter between the supply and Pin 2 of the jumper when using an

external supply. Current can also be measured by connecting an ammeter across pins 1 and 2 if

using the on board digital IO board regulators to power the board.

All power to the on-board digital IO regulators are supplied from +5V on the USB connector (normally

limited to 500mA maximum). The supply for the on-board class D amplifiers of the EVB can be

supplied from this +5V USB supply through SP7 but this is not recommended. The jumper J33 gives

the ability to power the on-board class D amplifiers from an external +5V power source as these can

draw high current when driven at full power. It is recommended that an external supply is used in this

way whenever the class D amplifiers are used.

Note 2 When using ammeters to measure the current to the device, ensure that any voltage drop across the

ammeter is accounted for so that the supply voltage reaching the device is at a sufficient level. Adding

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