Line

Input

LM4546A

$& µ97 Rev 2.1

Codec

LINE_IN_R

24

LINE_IN_L

23

LINE_OUT_L

1.0 PF

35

Line

Output

Microphone

Inputs

MIC2

22

MIC1

21

CD

Input

CD_GND

19

CD_L

18

CD_R

20

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

1.0 PF

37

MONO_OUT

3DN

10 k:

+

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

47

44

43

41

40

39

38

NC

NC

NC

NC

NC

NC

NC

NC

26

4

7

NC

NC

31

NC

NC

Default setting: Primary

Codec (ID 00)

NC

Mono

Output

1 PF

25

+

0.1 PF

5V Analog Supply

1

9

All NC pins should normally

be left open.

See Pin Descriptions for

details

(For external

microphone bias)

48

32

NC

NC

42

NC

NC

NC

NC

30

29

17

16

NC

NC

NC

NC

NC

14

NC

15

NC

NC

NC

3.3V or 5V Digital Supply

1 PF

+

0.1 PF

27 nH.

OBSOLETE

LM4546A

www.ti.com

SNOS991E – NOVEMBER 2002 – REVISED APRIL 2013

TYPICAL APPLICATION

Figure 8. LM4546A Typical Application Circuit, Single Codec, 1 Vrms Inputs

Application Hints

•

The LM4546A 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 explicitly muted if not used since it defaults to 0 dB gain on reset, unlike the

mute default of the other analog inputs

Copyright © 2002–2013, Texas Instruments Incorporated

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