Texas Instruments DEM-PCM2912A EVM manual Electrostatic Discharge Warning, Block Diagram

Electrostatic Discharge Warning www.ti.com

2.1Electrostatic Discharge Warning

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.

CAUTION

Failure to observe ESD handling procedures may result in damage to EVM components.

2.2Block Diagram

Figure 2-1illustrates the DEM-PCM2912A EVM block diagram and the default external equipment connection configuration.

PC

		PCM2912A		Mic
		D+,￿D−	VIN	J1
USB		PLAY	VOUTL/R
Connector		REC	POWER	Headphone
		MMUTE MAMP
D2	D1
CN1			JP1	J2
		SW1	JP2
		PCM2912A-EVM

Figure 2-1. DEM-PCM2912A EVM Block Diagram

2.3Interface and Connections

Table 2-1lists 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)

(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 SBAU141–January 2009

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