Datasheet
Line
Input
LM4549B
$&µ97 Rev 2.1
Codec
LINE_IN_R
24
LINE_IN_L
23
LINE_OUT_L
1.0 PF
35
Line
Output
AV
DD
DV
DD1
DV
SS1
DV
SS2
DV
DD2
AV
SS
Microphone
Inputs
MIC2
22
MIC1
21
CD
Input
CD_GND
19
CD_L
18
CD_R
20
Video
Input
VIDEO_R
17
VIDEO_L
16
Auxiliary
Input
AUX_R
15
AUX_L
14
Mono
Inputs
PHONE
13
PC_BEEP
12
BIT_CLK
6
SDATA_OUT
5
SDATA_IN
8
SYNC
10
RESET#
11
XTAL_IN
2
XTAL_OUT
3
33 pF
33 pF
1 M:
Z97
Digital
Controller
24.576 MHz
Analog
Ground
Digital
Ground
Connect Grounds at a single point
underneath or close to the package
+
LINE_OUT_R
1.0 PF
36
+
LNLVL_OUT_L
1.0 PF
39
+
LNLVL_OUT_R
1.0 PF
41
+
True Line Level
Output
1.0 PF
37
+
MONO_OUT
V
REF
3DN
V
REF_OUT
+
0.1 PF 3.3 PF
27
28
3DP
33
34
0.022 PF
Optional: for
National 3D Sound
ID0#
ID1#
45
46
NC
NC
NC
NC
NC
NC
NC
NC
44
43
42
38
32
31
30
NC
NC
NC
NC
NC
NC
NC
NC
26 4 7
NC
EAPD
47
NC
NC
Default setting: Primary
Codec (ID 00)
External Amplifier
Power Down
NC
Mono
Output
1 PF
25
+
0.1 PF
5V Analog Supply
1
9
All NC pins should normally
be left floating.
See Pin Descriptions for
details
V
REF
Output
(For external
microphone bias)
1.0 PF
1.0 PF
1.0 PF
1.0 PF
1.0 PF
1.0 PF
1.0 PF
1.0 PF
1.0 PF
1.0 PF
1.0 PF
1.0 PF
1.0 PF
+
++++++++++++
AV
DD
48
29
NC NC
40
3.3V or 5V Digital Supply
1 PF
+
0.1 PF
See text for cap values
LM4549B
SNAS598A –JULY 2012–REVISED MAY 2013
www.ti.com
Typical Application
Figure 8. LM4549B Typical Application Circuit, Single Codec, 1 Vrms inputs
Application Hints
• The LM4549B must be initialized by using RESET# to perform a Power On Reset as shown in the Power On
Reset Timing Diagram
• Don't leave unused Analog inputs floating. Tie all unused inputs together and connect to Analog Ground
through a capacitor (e.g. 0.1 µF)
• Do not leave CD_GND floating when using the CD stereo input. CD_GND is the AC signal reference for the
CD channels and should be connected to the CD source ground (Analog Ground may also be acceptable)
through a 1 µF capacitor
• If using a non-standard AC Link controller take care to keep the SYNC and SDATA_IN signals low during
Cold Reset to avoid entering the ATE or Vendor test modes by mistake.
• The PC_Beep input should be muted if not used since it defaults to 0 dB gain on reset, unlike the mute
default of the other analog inputs
8 Submit Documentation Feedback Copyright © 2012–2013, Texas Instruments Incorporated
Product Folder Links: LM4549B