2

3

4

5

6

7

8

9

10

J2

1

2

3

4

5

6

J1

NC KEY

VDDD

1

2

P

1

MCLK

IN

SPI

Interface

I2S

Interface

CA

P

C2

CA

P

C1

R1

1M

S

1

MCL

K

SE

L

CRYSTA

L

Y

1

MCLK/XTAL

IN

XTAL

OUT

SPI_DAT

A

SPI_ENABL

E

SPI_CL

K

I2S_DAT

A

I2S_CL

KI2S_WS

(LRCLK)

U1

LM4921ITL

BYPAS

S

E

2

D2

E

4

D3

E

3

C2

B

1

B

2

C4

C8

2.2 PF

C3

1 PF

C4

1 PF

C5

1 PF

Red Banana

Plug

Analog VDD

VDDA

VDDD

Red Banana

Plug

Digital VDD

Black Banana

Plug

Black Banana

Plug

Analo

g

Ground

Digita

l

Ground

N

C

C3

N

C

N

C

D4

N

C

N

C

A

2

N

C

1

J3

HEADPHONE

JACK

B

3

A

4

HP

L

HP

R

C7

100 PF

C6

100 PF

Left Out Test

Jack

Red Banana

Plug

Left Out Test Jack

Ground

Black Banana

Plug

Right Out Test Jack

Ground

Black Banana

Plug

Right Out Test

Jack

Red Banana

Plug

LM4921

SNAS178E – JULY 2003 – REVISED MAY 2013

www.ti.com

LM4921ITL DEMO BOARD OPERATION

The LM4921ITL demo board is a complete evaluation platform (Parallel Port SPI Interface Card and control

software available), designed to give easy access to the control pins of the part and comprise all the necessary

external passive components. There are separate analog and digital supply connectors, SPI interface bus (J1)

for the control lines, I2S interface bus (J2) for full-range digital audio, stereo headphone output (J3), and an

external MCLK input (P1) for use in place of the crystal on the demoboard.

(1)

Parallel Port SPI Interface Card and control software available.

Figure 21. LM4921ITL Demo Board Schematic

16

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