Owner manual

capacitor as close to V
DD
as possible. Route PGND
and all traces that carry switching transients away from
SGND and the audio signal path. Route digital signal
traces away from the audio signal path. Make traces
perpendicular to each other when routing digital sig-
nals over or under audio signals.
The thin QFN package features an exposed paddle
that improves thermal efficiency. Ensure that the
exposed paddle is electrically isolated from PGND,
SGND, and V
DD
. Connect the exposed paddle to
SV
SS
when the board layout dictates that the
exposed paddle cannot be left unconnected.
MAX9729
Stereo Headphone Amplifier with BassMax,
Volume Control, and Input Mux
______________________________________________________________________________________ 23
C6 (nF) f
POLE
(Hz) f
ZERO
(Hz)
100 38 106
82 47 130
68 56 156
56 68 190
47 81 230
22 174 490
10 384 1060
Table 11. BassMax Pole and Zero
Examples for a Gain Boost of 8.8dB
(R1 = 47kΩ, R2 = 22kΩ)
GAIN PROFILE WITH AND
WITHOUT BassMax
FREQUENCY (Hz)
A
V
(dB)
1k10010
-8
-6
-4
-2
0
2
4
6
8
10
-10
1 10k
MAX9729
CMD REGISTER
CODE = 0xFF
R1 = 47kΩ
R2 = 22kΩ
C3 = 0.1μF
f
POLE
f
ZERO
WITH
BassMax
WITHOUT
BassMax
Figure 9. BassMax Gain Profile Example