Datasheet

V
DD
GND
I
2
C Interface
EEPROM
Calibration
SDA
SCL
I
2
CV
DD
CAL
Analog
Noise Canceling
Processor
V
DD
Mic
Bias
Bias
ADR
PE
REF
10
nF
Mic
2
+
Mic
2 -
Mic
1
+
Mic
1
-
1 .
1 k
:
470 nF
1
P F
100
nF
1
. 1
k :
1
. 1
k
:
1 .
1 k
:
470
nF
470 nF
470 nF
* The value of the low-pass filter capacitor is application dependent, see the application section for additional information.
Shutdown
Optimized
Audio
Ouput
OUT
+
LPF
+
+
-
EN
GA0 GA1
GB0 GB1
M
2 _
UNP
M
1 _
UNP
*
Control bus
OUT
-
LPF
-
*
Post Amp
Gain
(6-18
dB)
Pre Amp
Gain
(6-36
dB)
T
7
Auxiliary Control
Unprocessed Microphone Outputs
Mic
1
Mic
2
** The value the microphone resistors is a standard value often used for electret microphones.
** **
**
**
Diff
Diff
SE
SE
LMV1089
SNAS441H –SEPTEMBER 2008–REVISED MAY 2010 www.ti.com
Typical Application
Figure 2. Typical Dual Microphone Far Field noise Cancelling Application
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