Texas Instruments DEM-PCM2912A EVM manual Pin Assignments and Terminal Functions, TopView

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1.2Pin Assignments and Terminal Functions

Figure 1-1shows the pin assignments for the PCM2912A. Table 1-1lists the terminal functions.

PCM2912APJT

(Top￿View)

POWER	MAMP
24	23

V	V	HGND	V	V	MBIAS
R	CCR			L
OUT			CCL	OUT
22	21	20	19	18	17

PGND 25

VCCP 26

TEST1 27

TEST0 28

SSPND 29

MMUTE 30

REC 31

PLAY 32

PCM2912APJT (32-pin￿TQFP)

1	2	3	4	5	6	7	8
BGND	V	D−	D+	V	DGND	XTO	XTI
	BUS			DD

16VIN

15VCCA

14NC

13AGND

12VCOM2

11VCOM1

10FR

9 FL

			Figure 1-1. PCM2912A Pin Assignments
		Table 1-1. PCM2912A Terminal Functions
	TQFP-36
Name	Terminal	I/O	Description
BGND	1	–	Reference for internal regulator
VBUS	2	–	Connect to USB power (VBUS)
D–	3	I/O	USB differential input/output minus
D+	4	I/O	USB differential input/output plus
VDD	5	–	Digital power supply
DGND	6		Digital ground
XTO	7	O	Crystal oscillator output
XTI	8	I	Crystal oscillator input
FL	9	–	External filter pin of left channel (optional)
FR	10	–	External filter pin of right channel (optional)
VCOM1	11	–	Common voltage for ADC, DAC and analog front-end (VCCA/2). Decoupling capacitor should
			be connected to AGND.
VCOM2	12	–	Common voltage for headphone (VCCA/2). Decoupling capacitor should be connected to
			AGND.
AGND	13	–	Analog ground
NC	14	–	Not connected
VCCA	15	–	Analog power supply
VIN	16	I	ADC microphone input
MBIAS	17	O	Microphone bias output (0.75 VCCA)
VOUTL	18	O	Headphone output for L-channel
VCCL	19	–	Analog power supply for headphone amplifier of L-channel
HGND	20	–	Analog ground for headphone amplifier
SBAU141–January 2009			Description	11
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