WM8750CLSEFLSLASHR datasheet(39/65 Pages) WOLFSON

39 / 65 page

Production Data

WM8750L

PD, Rev 4.4, August 2012

SPEAKER OUTPUT

LOUT2 and ROUT2 can differentially drive a mono 8

 speaker as shown below.

LOUT2

ROUT2

WM8750L

ROUT2INV = 1

SPKR = L-(-R) = L+R

-1

LEFT

MIXER

RIGHT

MIXER

ROUT2VOL

LOUT2VOL

Figure 14 Speaker Output Connection

The right channel is inverted by setting the ROUT2INV bit, so that the signal across the loudspeaker

is the sum of left and right channels.

LINE OUTPUT

The analogue outputs, LOUT1/ROUT1 and LOUT2/ROUT2, can be used as line outputs. Additionally,

OUT3 and MONOOUT can be used as a stereo line-out by setting OUT3SW=11 (reg. 24) and

ensuring the contents of registers 38 and 39 (mono-out mix) are the same as reg. 34 and 35 (left out

mix). Recommended external components are shown below.

AGND

LINE-OUT

SOCKET

(LEFT)

1uF

100 Ohm

LOUT1/2

or OUT3 (OUT3SW=11)

ROUT1/2

or MONOOUT

WM8750L

100 Ohm

LINE-OUT

SOCKET

(RIGHT)

1uF

Figure 15 Recommended Circuit for Line Output

The DC blocking capacitors and the load resistance together determine the lower cut-off frequency, fc.

Assuming a 10 kOhm load and C1, C2 = 1

F:

fc = 1 / 2 (RL+R1) C1 = 1 / (2 x 10.1k x 1F) = 16 Hz

Increasing the capacitance lowers fc, improving the bass response. Smaller values of C1 and C2 will

diminish the bass response. The function of R1 and R2 is to protect the line outputs from damage

when used improperly.

WM8750CLSEFL/R 데이터시트(PDF) 39 Page - Wolfson Microelectronics plc

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