MAX9853 Maxim Integrated Products, MAX9853 Datasheet - Page 49

• Manufacturer Part Number: MAX9853
• Description: (MAX9851 / MAX9853) Stereo Audio CODECs
• Manufacturer: Maxim Integrated Products

Table 16 shows the possible mixing configurations of
the incoming digital audio streams. Each of the four
00 = VIBE is high.
01 = VIBE is low.
10 = Inverted threshold comparator output connected
to VIBE.
11 = Inverted 1-bit DAC nonfiltered output connected
to VIBE.
See the VIBE Output section. TMUX selects the signal
path of the VIBE output. Set TSEL (register 0x07, B5).
1 = Secondary (S2) left or left + right digital audio signal.
0 = Primary (S1) right digital audio signal.
TSEL = 0 configures the MAX9851/MAX9853 to use the
right channel of the primary digital audio interface for
Table 15. DAC Input Mixer
Table 16. DAC Input Mixer
X = Don’t care.
Table 17. Transducer/Vibe Bit Descriptions
Stereo Audio CODECs with Microphone, DirectDrive
Left and Right DAC Input Mixer (MIXDAL/MIXDAR)
INPUT SOURCE
REG
0x08
REG
0x09
Headphones, Speaker Amplifiers, or Line Outputs
S1 Right
S2 Right
S1 Left
S2 Left
Transducer/Vibe DAC Output Select (TMUX)
Transducer/Vibe DAC Path Enable (TSEL)
B7
B7
______________________________________________________________________________________
TMUX
LEFT DAC (REGISTER 0x08,
B6
B6
BITS B7–B4)
MIXDAL
XX1X
XXX1
1XXX
X1XX
MIXDAL
TSEL
B5
B5
RIGHT DAC (REGISTER 0x08,
B4
B4
digital audio streams can be mixed in any combination
and routed to the left or right DAC independently.
transducer/vibe signal conditioning. TSEL = 1 configures
the MAX9851/MAX9853 to use the left channel (or left +
right if S2 mono mix is enabled) of the secondary digital
audio interface for transducer/vibe signal conditioning.
When using the comparator for VIBE output, program
VTH to set the level that positive digital audio data will be
compared against. If the input data is less than VTH, then
VIBE = 1. If the input data is greater than VTH, then VIBE
= 0. If VTH = 0x00, all negative signal values will force
VIBE high and all positive values will force VIBE low (see
Figure 6 for operation).
BITS B3–B0)
MIXDAR
XX1X
XXX1
1XXX
X1XX
Transducer/Vibe Squelch Comparator Threshold
B3
B3
Transducer/Vibe Register (0x09)
Digital Mixer Register (0x08)
VTH
B2
B2
Mix the primary digital audio
interface left channel
Mix the primary digital audio
interface right channel
Mix the secondary digital audio
interface left channel
Mix the secondary digital audio
interface right channel
MIXDAR
DESCRIPTION
B1
B1
B0
B0
(VTH)
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