Electrostatic Discharge Warning; Block Diagram; Interface And Connections; Dem-Pcm2912 Evm Block Diagram - Texas Instruments DEM-PCM2912 EVM User Manual

Electrostatic Discharge Warning

2.1 Electrostatic Discharge Warning
Many of the components on the DEM-PCM2912 EVM are susceptible to damage by electrostatic
discharge (ESD). Customers are advised to observe proper ESD handling precautions when unpacking
and handling the EVM, including the use of a grounded wrist strap at an approved ESD workstation.
Failure to observe ESD handling procedures may result in damage to EVM
components.
2.2

Block Diagram

Figure 2-1 illustrates the DEM-PCM2912 EVM block diagram and the default external equipment
connection configuration.
PC
2.3

Interface and Connections

Table 2-1 lists the connector references for the DEM-PCM2912 EVM.
CN1
J1
J2
D1
D2
SW1
JP1
JP2
(1)
The status of SW1 (microphone mute switch) is not reflected in the Mic Mute status of the Wave In
display on a Windows-based PC; the operating system does not support an HID function.
16 Getting Started
USB
Connector
D2 D1
CN1
Figure 2-1. DEM-PCM2912 EVM Block Diagram
Table 2-1. DEM-PCM2912 EVM Connectors
Connectors
USB connector, type A
Mono microphone input
Headphone output terminal
LED (red); record indicator (flash while muting)
LED (green); playback indicator (flash while muting)
Microphone mute switch
Power select (L: 100 mA, H: 500 mA)
Microphone amplifier gain control
(Gain = 0 dB/+20 dB)
CAUTION
PCM2912
D+, D- V
IN
PLAY V L/R
OUT
REC POWER
Headphone
MMUTE MAMP
JP1
SW1
JP2
PCM2912-EVM
Part/Description
(1)
www.ti.com
Mic
J1
J2
SBAU132 – March 2008
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