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PCM2912 Datasheet(PDF) 26 Page - Texas Instruments

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Part # PCM2912
Description  AUDIO CODEC WITH USB INTERFACE, MONO MICROPHONE INPUT AND STEREO HEADPHONE OUTPUT
PDF  32 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

PCM2912 Datasheet(HTML) 26 Page - Texas Instruments

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TYPICAL CIRCUIT CONNECTION
R1
R2
6
5
4
3
2
1
8
7
26
25
32
31
30
29
28
27
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
POWER
MBIAS
BGND
TEST1
TEST0
SSPND
MMUTE
REC
PLAY
PGND
PCM2912
FL
FR
VCOM1
VCOM2
AGND
N.C.
VCCA
VIN
X1
C2
R4
VBUS D –
D+ GND
USBConnector
C3
C1
Microphone
Headphone
PLAY
REC.
MicMute
R8
R9
C17
C14
C15
R6
C12
R7
C4
C5
C11
R10
R11
R1 2
R1 3
C6
C7
C8
C9
C10
C13
C16
R5
R3
V
CCP
C18
L1
PCM2912
SLES216 – FEBRUARY 2008
A bus-powered (Hi-power), +20-dB microphone amplifier application example follows.
NOTE: X1: 6-MHz crystal resonator
C1, C8, C11, C14, C17, C18: 1 µF ceramic
C2, C3: 10 pF to 33 pF (depending on load capacitance of crystal resonator)
C4, C5: 100 pF ceramic
C6, C10: 3.3 µF
C7: 0.1 µF
C9: 0.22 µF electrolytic (depending on required frequency response for microphone input)
C12, C15: 0.022 µF ceramic
C13, C16: 100 µF electrolytic (depending on required frequency response for headphone output)
R1, R2: 22 Ω to 33 Ω
R3: 1.5 kΩ
R4: 1 MΩ
R5: 1 kΩ (depending on microphone characteristic)
R6, R9: 16 Ω
R7, R8, R10, R11: 3.3 kΩ
R12, R13: 820 Ω (depending on LED drive current)
L1: 1 µH (DC resistance <0.6 Ω)
It is possible to change maximum power, if total power of actual application does not require over 100 mA (POWER =
Low to configure as low-power device).
Figure 37. USB Headset Application
NOTE:
The preceding circuit is for information only. Total board design should be considered
in order to meet the USB specification as a USB-compliant product.
26
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Copyright © 2008, Texas Instruments Incorporated
Product Folder Link(s): PCM2912



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