Audio Codec with USB Interface, Mono ... - Texas Instruments
Audio Codec with USB Interface, Mono ... - Texas Instruments
Audio Codec with USB Interface, Mono ... - Texas Instruments
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PCM2912A<br />
SLES230–SEPTEMBER 2008.......................................................................................................................................................................................... www.ti.com<br />
TYPICAL CIRCUIT CONNECTION<br />
A bus-powered (Hi-power), +20-dB microphone amplifier application example is shown in Figure 37.<br />
REC<br />
R12<br />
C17<br />
Mic Mute<br />
R13<br />
POWER 24 23 22 21 20 19 18 17 MBIAS<br />
PLAY<br />
25<br />
26<br />
27<br />
28<br />
29<br />
30<br />
31<br />
32<br />
PGND<br />
V CCP<br />
TEST1<br />
TEST0<br />
SSPND<br />
MMUTE<br />
REC<br />
PLAY<br />
C14<br />
BGND 1 2 3 4 5 6 7 8<br />
R1 R2<br />
Headphone<br />
R11<br />
R10<br />
PCM2912A<br />
V BUS D– D+ GND<br />
C1<br />
R8<br />
R7<br />
C11<br />
C2<br />
V IN<br />
V CCA<br />
NC<br />
AGND<br />
V COM2<br />
FR<br />
FL<br />
R4<br />
X1<br />
C3<br />
<strong>USB</strong> Connector<br />
16<br />
15<br />
14<br />
13<br />
12<br />
11<br />
10<br />
9<br />
Microphone<br />
NOTE: X 1: 6-MHz crystal resonator<br />
C 1, C 8, C 11, C 14, C 17, C 18: 1 μF ceramic<br />
C 2, C 3: 10 pF to 33 pF (depending on load capacitance of crystal resonator)<br />
C 4, C 5: 100 pF ceramic<br />
C 6, C 10: 3.3 μF<br />
C 7: 0.1 μF<br />
C 9: 0.22 μF electrolytic (depending on required frequency response for microphone input)<br />
C 13, C 16: 100 μF electrolytic (depending on required frequency response for headphone output)<br />
R 1, R 2: 22 Ω to 33 Ω<br />
R 3: 1.5 kΩ<br />
R 4: 1 MΩ<br />
R 5: 1 kΩ (depending on microphone characteristic)<br />
R 7, R 8, R 10, R 11: 3.3 kΩ<br />
R 12, R 13: 820 Ω (depending on LED drive current)<br />
L 1: 1 μH (DC resistance < 0.6 Ω)<br />
It is possible to change maximum power if total power of actual application does not require over 100 mA (set<br />
POWER = low to configure as low-power device).<br />
C18<br />
L1<br />
C16<br />
MAMP<br />
V BUS<br />
V R<br />
OUT<br />
D-<br />
V CC R<br />
D+<br />
R3<br />
HGND<br />
VCCL V DD<br />
DGND<br />
V L<br />
OUT<br />
XTO<br />
C13<br />
XTI<br />
R5<br />
C10<br />
V COM1<br />
Figure 37. <strong>USB</strong> Headset Application<br />
NOTE:<br />
The circuit in Figure 37 is for information only. Total board design should be<br />
considered in order to meet the <strong>USB</strong> specification as a <strong>USB</strong>-compliant product.<br />
26 Submit Documentation Feedback Copyright © 2008, <strong>Texas</strong> <strong>Instruments</strong> Incorporated<br />
Product Folder Link(s): PCM2912A<br />
C9<br />
C8<br />
C7<br />
C6<br />
C5<br />
C4
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