Texas Instruments DEM-PCM2912A EVM Datenbogen
2.1
Electrostatic Discharge Warning
2.2
Block Diagram
PC
USB
Connector
D2
D1
SW1
JP1
J1
JP2
J2
PCM2912A
PCM2912A-EVM
Mic
Headphone
CN1
D+, D-
PLAY
REC
PLAY
REC
V
IN
V
L/R
OUT
POWER
MMUTE MAMP
2.3
Interface and Connections
Electrostatic Discharge Warning
www.ti.com
Many of the components on the DEM-PCM2912A 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.
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.
CAUTION
Failure to observe ESD handling procedures may result in damage to EVM
components.
components.
illustrates the DEM-PCM2912A EVM block diagram and the default external equipment
connection configuration.
Figure 2-1. DEM-PCM2912A EVM Block Diagram
lists the connector references for the DEM-PCM2912A EVM.
Table 2-1. DEM-PCM2912A EVM Connectors
Connectors
Part/Description
CN1
USB connector, type A
J1
Mono microphone input
J2
Headphone output terminal
D1
LED (red); record indicator (flash while muting)
D2
LED (green); playback indicator (flash while muting)
SW1
Microphone mute switch
(1)
JP1
Power select (L: 100 mA, H: 500 mA)
JP2
Microphone amplifier gain control
(Gain = 0 dB/+20 dB)
(Gain = 0 dB/+20 dB)
(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.
display on a Windows-based PC; the operating system does not support an HID function.
Getting Started
16
SBAU141 – January 2009