Texas Instruments TLV320DAC26EVM, Руководство пользователя

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Device Characteristics
1-2
1.1 Device Characteristics
The DAC26 is an audio band DAC with headphone/speaker amplifier. The
DAC26 has audio playback capability. Access to the audio DAC section of the
DAC26 is through an I
2
S interface. The DAC26 interfaces to the host controller
through a standard SPI serial interface.
1.2 EVM Block Diagram
A block diagram of the DAC26 evaluation kit is shown in Figure 1−1.
Figure 1−1. DAC26 Evaluation Kit Block Diagram
TAS1020B
(MCU and
USB Controller)
J10
4
5
3
3.3 V
VREG
1 2
J11
12 11
I2S AUDIO
1 2
J12
12 11 EXT SPI
USB
J9
6−12 VDC
SPI
I2S
AUDIO
ANALOG
J6
HEADPHONE OUT
J7
OUT
J5
MIC IN
AUX
GND
J3
DAC26
MICIN
Onboard MK1
2
I
2
C
EEPROM
Store
Firmware
for TAS1020B
6−10 VDC 2,5 mm
J8
Buffer
Buffer
SW1
1.8 V
Loudspeaker
J13
The digital control interface is through either the USB bus or an external SPI
bus. The onboard microprocessor can be disabled, allowing the external SPI
bus to control the DAC26.
Power supplies are derived from the USB bus or may be provided to the kit
through external connectors from an external user-supplied laboratory power
supply.