Texas Instruments DEM-PCM2912AEVM User Manual page 3

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2 Hardware
2.1 Pin Assignments and Terminal Functions
Figure 2-1 shows the pin assignments for the PCM2912A.
TQFP-36
Name Terminal
BGND 1
V 2
BUS
D– 3
D+ 4
V 5
DD
DGND 6
XTO 7
XTI 8
FL 9
FR 10
V 11
COM1
V 12
COM2
AGND 13
NC 14
V 15
CCA
V 16
IN
MBIAS 17
V L 18
OUT
V 19
CCL
HGND 20
V 21
CCR
V R 22
OUT
MAMP 23
SBAU141A – JANUARY 2009 – REVISED APRIL 2024
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PCM2912APJT
(Top View)
24 23 22 21
25
PGND
V 26
CCP
TEST1 27
TEST0 28
PCM2912APJT
(32-pin TQFP)
SSPND 29
MMUTE 30
REC 31
PLAY 32
1 2 3 4
Figure 2-1. PCM2912A Pin Assignments
Table 2-1. PCM2912A Terminal Functions
I/O
– Reference for internal regulator
– Connect to USB power (V
I/O USB differential input/output minus
I/O USB differential input/output plus
– Digital power supply
Digital ground
O Crystal oscillator output
I Crystal oscillator input
– External filter pin of left channel (optional)
– External filter pin of right channel (optional)
– Common voltage for ADC, DAC and analog front-end (V
connected to AGND.
– Common voltage for headphone (V
– Analog ground
– Not connected
– Analog power supply
I ADC microphone input
O Microphone bias output (0.75 V
O Headphone output for L-channel
– Analog power supply for headphone amplifier of L-channel
– Analog ground for headphone amplifier
-– Analog power supply for headphone amplifier of R-channel
O Headphone output for R-channel
I Microphone preamplifier gain control (LOW: Preamplifier off; HIGH: Preamplifier on = +20
dB)
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Table 2-1 lists the terminal functions.
20 19 18 17
16 V
IN
15 V
CCA
14 NC
13 AGND
12 V
COM2
11 V
COM1
10 FR
9 FL
5 6 7 8
Description
)
BUS
CCA
/2). Decoupling capacitor is connected to AGND.
CCA
)
CCA
DEM-PCM2912A Evaluation Module
Hardware
/2). Decoupling capacitor is
3