LMV1089RLEVAL National Semiconductor, LMV1089RLEVAL Datasheet - Page 23

• Manufacturer Part Number: LMV1089RLEVAL
• Description: BOARD EVALUATION LMV1089
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LMV1089RLEVAL

• Main Purpose: Audio, Microphone Amp
• Embedded: No
• Utilized Ic / Part: LMV1089
• Primary Attributes: Dual Input, Single Output
• Secondary Attributes: Graphical User Interface, I²C Interface
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Connector and Header Functions for the LMV1089VY Demoboard
Connector
J13+J14
J23+J24
Header/
J21/J22
J8, J10
BT1
J28
J11
J12
J15
J16
J17
J18
J19
J20
J27
J25
J26
J27
J1
J2
J3
J4
J5
J6
J7
(M1_UNP) Unprocessed audio output for
microphone channel 1
(M2_UNP) Unprocessed audio output for
microphone channel 2
(GA0) Default input gain setting bit 0
(GA1) Default input gain setting bit 1
(GB0) Default output gain setting bit 0
(GB1) Default output gain setting bit 1
(TM) Test Mode
(LPF) Low pass filter selection
(MIC1) Microphone input jack
(SELECT) Connection for input of electrical test
signals at pin 4 and 5 or
activation of Microphone input connector J9
Power supply Connection
(OUT-) Output signal of the processed audio
(MIC2) Microphone input jack
(SELECT) Connection for input of electrical test
signals at pin 4 and 5 or
activation of Microphone input connector J15
(I
(PE) Enable Programming of the EEPROM
(CAL) Start calibration of the two microphones
(I
(OUT+) Output signal of the processed audio
(I
(I
(EN)
(V
(Output) Processed output signal
3V Lithium battery holder
2
2
DD
2
Cadd) I
C) I
CV
DD
) Supply current measurement
SEL) Selection of the supply source
DD)
2
C interface connector
Selection of
2
C address selection
Indication/Function
I2
CV
DD
23
See Table 2 Default Pre Amplifier gain
See Table 3 Default Post Amplifier gain
Close to enter Test Mode
Pin 1+2 to connect an external LPF capacitor. Pin 2+3
select the on board LPF capacitor C5, C14 (a minimum
of 1nF is always mounted on the board)
Stereo 3.5 mm jack with ground connection. tip = Mic
+ 1st ring = Mic-
Pin 3+4 differential input with ground at Pin 5+6
Header between Pin 1+3 and 2+4
Connect power supply here if not powering from USB.
Be sure to remove shorts from J22 & J21.
Stereo 3.5 mm jack with ground connection. tip =Mic+
1st ring = Mic-
Pin 3+4 differential input with ground at Pin 5+6
Header between Pin 1+3 and 2+4
Open: (0CE Hex) Closed (0CC Hex)
Closed = Program Enable
Close = start Calibration
Normally shorted by jumper, replace jumper by DMM
for supply current measurement
Short J21 & J22 to power demo board from I
board
Normally shorted to enable
Header Pin 1+2 = Battery enabled, Header Pin 2+3 =
Comments
www.national.com
2
C_USB