參數(shù)資料
型號(hào)： MAX5406EUM+T
廠(chǎng)商： Maxim Integrated Products
文件頁(yè)數(shù)： 14/26頁(yè)
文件大?。?/td> 0K
描述： IC PROC AUDIO W/PB 48TSSOP
標(biāo)準(zhǔn)包裝： 2,500
類(lèi)型： 音頻處理器
應(yīng)用： 臺(tái)式音頻，卡拉 OK，TV
安裝類(lèi)型： 表面貼裝
封裝/外殼： 48-TFSOP（0.240"，6.10mm 寬）
供應(yīng)商設(shè)備封裝： 48-TSSOP
包裝： 帶卷 (TR)
MAX5406
Audio Processor with Pushbutton Interface
______________________________________________________________________________________
21
Pseudostereo
Pseudostereo creates a sound approximating stereo
from a monophonic signal. Use the equations for pseu-
dostereo response calculations:
Connect a pseudostereo network (FL(S) and FR(S)) as
shown in Figure 10 to filter and delay the LPR signal
and create the pseudo signal.
Click/Pop Suppression
The click/pop suppression feature reduces the audible
noise (clicks and pops) that results from wiper transi-
tions. The MAX5406 minimizes this noise by allowing
the wiper position changes only when the potential
across the pot is zero. Thus, the wiper changes posi-
tion only when the voltage at L_ is the same as the volt-
age at the corresponding H_. Each wiper has its own
suppression and timeout circuitry (see Figure 11a). The
MAX5406 changes wiper position after 32ms or when
high = low, whichever occurs first (see Figure 11b).
Power-On Reset
The MAX5406 initiates power-on reset when VLOGIC
falls below 2.2V and returns to normal operation when
VLOGIC = +2.7V. A power-on reset places the volume in
the mute (-90dB) state and volume wipers gradually
move to -20dB over a period of 0.7s in 2dB steps if no
zero-crossing event is detected. All other controls
remain in the 0dB position.
Shutdown (
SHDN)
The MAX5406 stores the current wiper setting of each
potentiometer in shutdown mode. The wipers move to
the mute position to minimize the signal out of LOUT
and ROUT. Returning from shutdown mode restores all
wipers to their previous settings. Button presses in
shutdown are ignored.
Mute Function (
MUTE)
The MAX5406 features a mute function that sets the
volume typically 90dB attenuation relative to full scale.
Successive pulses on MUTE toggle its setting.
Activating the mute function forces all wipers to the low
side of the potentiometer chain. Deactivating the mute
function returns the wipers to their previous settings.
MUTE is internally pulled high with a 50k
Ω resistor
to VLOGIC.
Multiple Button Pushes
The MAX5406 ignores simultaneous presses of two or
more buttons. Pushing more than one button at the
same time does not change the state of the wipers.
Additionally, further key presses are ignored for 50ms
after all keys have been released. The MAX5406 does not
respond to any logic input until the blocking period ends.
Bias Generator
The MAX5406 generates a midrail, (VDD + VSS) / 2 bias
voltage, for use with the input amplifiers.
For normal single-supply operation and single-ended
signals, connect R1_L, L1_L, R2_L, and L2_L to VBIAS
and VSS to ground.
Enable the VBIAS generator by connecting CMSNS to VSS
or leave CMSNS unconnected. Disable the VBIAS genera-
tor by forcing CMSNS to VDD. For proper operation, do not
use VBIAS to power other circuitry.
where
LR
are the signals at LPR
IN
+
4
.
LOUT L
F
LR
ROUT R
F
LR
IN
L S
IN
R S
IN
=+
×
+
=×
+
()
4
-
LEFT CHANNEL
INPUT
RIGHT CHANNEL
INPUT
CLSP
CLSN
CSUB
CCSUB
SUBOUT
CRSN
CRSP
CCRS
CCLS
RRS
RLS
RSUB
VBIAS
Figure 12. Subwoofer Output Stage
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