adau1961 Analog Devices, Inc., adau1961 Datasheet - Page 33

• Manufacturer Part Number: adau1961
• Description: Stereo, Low Power, 96 Khz, 24-bit Audio Codec With Integrated Pll Adau1961
• Manufacturer: Analog Devices, Inc.

PLAYBACK SIGNAL PATH
OUTPUT SIGNAL PATHS
The outputs of the ADAU1961 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 = 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.
RIGHT INPUT MIXER
RIGHT INPUT MIXER
LEFT INPUT MIXER
LEFT INPUT MIXER
RIGHT DAC
RIGHT DAC
LEFT DAC
LEFT DAC
RAUX
LAUX
MX3AUXG[3:0]
MX4AUXG[3:0]
MX3G1[3:0]
MX3G2[3:0]
MX4G1[3:0]
MX4G2[3:0]
–15dB TO +6dB
–15dB TO +6dB
–15dB TO +6dB
–15dB TO +6dB
–15dB TO +6dB
–15dB TO +6dB
MX3LM
MX3RM
MX4LM
MX4RM
(MONO MIXER)
MX7[1:0]
MIXER 7
Figure 43. Playback Signal Path
PLAYBACK
PLAYBACK
MIXER 3
MIXER 4
(RIGHT
MIXER)
MIXER)
(LEFT
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MX6G3[1:0]
MX5G4[1:0]
MX5G3[1:0]
MX6G4[1:0]
Routing Flexibility
The playback path contains five mixers (Mixer 3 to Mixer 7)
that perform the following functions:
•
•
•
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
register, Address 0x401A) and Register R21 (right input digital
volume register, Address 0x401B).
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.
(RIGHT L/R
PLAYBACK
PLAYBACK
(LEFT L/R
MIXER 6
MIXER 5
MIXER)
MIXER)
LHPVOL[5:0]
RHPVOL[5:0]
ROUTVOL[5:0]
LOUTVOL[5:0]
–57dB TO +6dB
–57dB TO +6dB
–1
–1
MONOVOL[5:0]
–57dB TO +6dB
–57dB TO +6dB
–57dB TO +6dB
ADAU1961
LHP
LOUTP
LOUTN
MONOOUT
ROUTN
ROUTP
RHP