ADAU1361BCPZ-R7 datasheet(35/80 Pages) AD

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Data Sheet

ADAU1361

Rev. D | Page 35 of 80

PLAYBACK SIGNAL PATH

MX3G2[3:0]

MX3AUXG[3:0]

–15dB TO +6dB

MX3LM

–15dB TO +6dB

MX3RM

MX3G1[3:0]

–15dB TO +6dB

RIGHT INPUT MIXER

LEFT DAC

LAUX

LHP

–57dB TO +6dB

LHPVOL[5:0]

RIGHT DAC

LEFT INPUT MIXER

MX4G2[3:0]

MX4AUXG[3:0]

–15dB TO +6dB

MX4LM

–15dB TO +6dB

–57dB TO +6dB

MX4RM

MX4G1[3:0]

–15dB TO +6dB

RIGHT INPUT MIXER

LEFT DAC

RAUX

RHPVOL[5:0]

ROUTVOL[5:0]

RHP

ROUTP

ROUTN

MONOOUT

MX6G4[1:0]

MX5G4[1:0]

(MONO MIXER)

MIXER 7

MX7[1:0]

MX6G3[1:0]

–57dB TO +6dB

MONOVOL[5:0]

RIGHT DAC

LEFT INPUT MIXER

MX5G3[1:0]

–57dB TO +6dB

LOUTVOL[5:0]

LOUTP

LOUTN

MIXER 4

(RIGHT

PLAYBACK

MIXER)

MIXER 3

(LEFT

PLAYBACK

MIXER)

MIXER 5

(LEFT L/R

PLAYBACK

MIXER)

MIXER 6

(RIGHT L/R

PLAYBACK

MIXER)

–1

Figure 43. Playback Signal Path

OUTPUT SIGNAL PATHS

The outputs of the ADAU1361 can be configured as a variety of

differential or single-ended outputs. All analog output pins are

capable of driving headphone or earpiece speakers. There are

selectable output paths for stereo signals or a downmixed mono

output. The line outputs can drive a load of at least 10 kΩ or can

be put into HP mode to drive headphones or earpiece speakers.

The analog output pins are biased at AVDD/2.

With a 0 dBFS digital input and AVDD = 1.8 V, the full-scale

output level is 500 mV rms; when AVDD = 3.3 V, the full-scale

output level is 920 mV rms.

Signals are inverted through the mixers and volume controls.

The result of this inversion is that the polarity of the differential

outputs and the headphone outputs is preserved. The single-

ended mono output is inverted. The DACs are noninverting.

Routing Flexibility

The playback path contains five mixers (Mixer 3 to Mixer 7)

that perform the following functions:

•

Mix signals from the record path and the DACs.

•

Mix or swap the left and right channels.

•

Mix a mono signal or generate a common-mode output.

Mixer 3 and Mixer 4 are dedicated to mixing signals from the

record path and the DACs. Each of these two mixers can accept

signals from the left and right DACs, the left and right input

mixers, and the dedicated channel auxiliary input. Signals

coming from the record path can be boosted or cut before the

playback mixer.

For example, the MX4G2[3:0] bits set the gain from the output

of Mixer 2 (right record channel) to the input of Mixer 4, hence

the naming convention.

Signals coming from the DACs have digital volume attenu-

ation controls set in Register R20 (left input digital volume

volume register, Address 0x401B).

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