Texas Instruments DEM-PCM2912A EVM manual Functional Block Diagram

www.ti.com Functional Block Diagram

1.3Functional Block Diagram

Figure 1-2illustrates the functional block diagram of the DEM-PCM2912A EVM.

BGND VCCA/VCCP/VCCL/VCCR/VDDAGND/HGND/PGND/DGND

					Power		SSPND
				5￿V￿to￿3.3￿V	Manager
		VREF		Voltage
				Regulator			VBUS
MBIAS	MIC	PGA￿+30￿dB￿to
	Bias	−12￿dB
							D+
		in￿1-dB￿steps
	MIC				ISO-in	XCVR	D−
				FIFO
VIN	Amp				endpoint
		ADC
			Selector			USB￿SIE
				Analog	Control		POWER
VCOM2					endpoint
				PLL			MAMP
VCOM1				Analog			MMUTE
		ATT￿0￿dB￿to −76￿dB
				PLL
		in￿1-dB￿steps￿with￿Mute
VOUTL		Σ	Selector				PLAY
		DAC			ISO-out		REC
VOUTR		Σ		FIFO
					endpoint
	HP￿AMP￿15￿mW￿(at￿32 Ω)
	ATT￿0￿dB￿to −76￿dB
	in￿1-dB￿steps￿with￿Mute				USB￿protocol		TEST0
FL					controller		TEST1
FR
			PLL￿(x16)	96￿MHz	Tracker
					(SpAct)
		6.000￿MHz
	XTI	XTO

Figure 1-2. DEM-PCM2912A EVM Functional Block Diagram

SBAU141–January 2009 Description 13

Submit Documentation Feedback