LMV1012
LMV1012 Analog Series: Pre-Amplified IC's for High Gain 2-Wire Microphones
Literature Number: SNAS194G
LMV1012 Analog Series:
Pre-Amplified IC’s for High Gain 2-Wire Microphones
General Description
The LMV1012 is an audio amplifier series for small form
factor electret microphones. This 2-wire portfolio is designed
to replace the JFET amplifier currently being used. The
LMV1012 series is ideally suited for applications requiring
high signal integrity in the presence of ambient or RF noise,
such as in cellular communications. The LMV1012 audio
amplifiers are guaranteed to operate over a 2.2V to 5.0V
supply voltage range with fixed gains of 7.8 dB, 15.6 dB,
20.9 dB, and 23.8 dB. The devices offer excellent THD, gain
accuracy and temperature stability as compared to a JFET
microphone.
The LMV1012 series enables a two-pin electret microphone
solution, which provides direct pin-to-pin compatibility with
the existing JFET market.
The devices are offered in extremely thin space saving
4-bump micro SMD packages. The LMV1012XP is designed
for 1.0 mm canisters and thicker ECM canisters. These
extremely miniature packages are designed for electret con-
denser microphones (ECM) form factor.
Features
(Typical LMV1012-15, 2.2V supply, R
L
= 2.2 kΩ, C = 2.2 µF,
V
IN
=18mV
PP
, unless otherwise specified)
nSupply voltage 2V - 5V
nSupply current <180 µA
nSignal to noise ratio (A-weighted) 60 dB
nOutput voltage noise (A-weighted) −89 dBV
nTotal harmonic distortion 0.09%
nVoltage gain
— LMV1012-07 7.8 dB
— LMV1012-15 15.6 dB
— LMV1012-20 20.9 dB
— LMV1012-25 23.8 dB
nTemperature range −40˚C to 85˚C
nOffered in 4-bump micro SMD packages
Applications
nCellular phones
nHeadsets
nMobile communications
nAutomotive accessories
nPDAs
nAccessory microphone products
Schematic Diagram
20058701
Built-In Gain Electret Microphone
20058702
October 2005
LMV1012 Analog Series Pre-Amplified IC’s for High Gain 2-Wire Microphones
© 2005 National Semiconductor Corporation DS200587 www.national.com
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
ESD Tolerance (Note 2)
Human Body Model 2500V
Machine Model 250V
Supply Voltage
V
DD
- GND 5.5V
Storage Temperature Range −65˚C to 150˚C
Junction Temperature (Note 6) 150˚C max
Mounting Temperature
Infrared or Convection (20 sec.) 235˚C
Operating Ratings (Note 1)
Supply Voltage 2V to 5V
Temperature Range −40˚C to 85˚C
2.2V Electrical Characteristics (Note 3)
Unless otherwise specified, all limits guaranteed for T
J
= 25˚C, V
DD
= 2.2V, V
IN
= 18 mV, R
L
= 2.2 kΩand C = 2.2 µF.
Boldface limits apply at the temperature extremes.
Symbol Parameter Conditions
Min
(Note 4)
Typ
(Note 5)
Max
(Note 4) Units
I
DD
Supply Current V
IN
= GND LMV1012-07 139 250
300
µA
LMV1012-15 180 300
325
LMV1012-20 160 250
300
LMV1012-25 141 250
300
SNR Signal to Noise Ratio f = 1 kHz, V
IN
=18
mV, A-Weighted
LMV1012-07 59
dB
LMV1012-15 60
LMV1012-20 61
LMV1012-25 61
V
IN
Max Input Signal f = 1 kHz and
THD+N <1%
LMV1012-07 170
mV
PP
LMV1012-15 100
LMV1012-20 50
LMV1012-25 28
V
OUT
Output Voltage V
IN
= GND LMV1012-07 1.65
1.54
1.90 2.03
2.09
V
LMV1012-15 1.54
1.48
1.81 1.94
2.00
LMV1012-20 1.65
1.55
1.85 2.03
2.13
LMV1012-25 1.65
1.49
1.90 2.02
2.18
f
LOW
Lower −3dB Roll Off Frequency R
SOURCE
=50Ω65 Hz
f
HIGH
Upper −3dB Roll Off Frequency R
SOURCE
=50Ω95 kHz
e
n
Output Noise A-Weighted LMV1012-07 −96
dBV
LMV1012-15 −89
LMV1012-20 −84
LMV1012-25 −82
THD Total Harmonic Distortion f = 1 kHz,
V
IN
=18mV
LMV1012-07 0.10
%
LMV1012-15 0.09
LMV1012-20 0.12
LMV1012-25 0.15
C
IN
Input Capacitance 2pF
Z
IN
Input Impedance >1000 GΩ
LMV1012 Analog Series
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2.2V Electrical Characteristics (Note 3) (Continued)
Unless otherwise specified, all limits guaranteed for T
J
= 25˚C, V
DD
= 2.2V, V
IN
= 18 mV, R
L
= 2.2 kΩand C = 2.2 µF.
Boldface limits apply at the temperature extremes.
Symbol Parameter Conditions
Min
(Note 4)
Typ
(Note 5)
Max
(Note 4) Units
A
V
Gain f = 1 kHz,
R
SOURCE
=50Ω
LMV1012-07 6.4
5.5
7.8 9.5
10.0
dB
LMV1012-15 14.0
13.1
15.6 16.9
17.5
LMV1012-20 19.5
17.4
20.9 22.0
23.3
LMV1012-25 22.5
21.4
23.8 25.0
25.7
5V Electrical Characteristics (Note 3)
Unless otherwise specified, all limits guaranteed for T
J
= 25˚C, V
DD
= 5V, V
IN
= 18 mV, R
L
= 2.2 kΩand C = 2.2 µF.
Boldface limits apply at the temperature extremes.
Symbol Parameter Conditions
Min
(Note 4)
Typ
(Note 5)
Max
(Note 4) Units
I
DD
Supply Current V
IN
= GND LMV1012-07 158 250
300
µA
LMV1012-15 200 300
325
LMV1012-20 188 260
310
LMV1012-25 160 250
300
SNR Signal to Noise Ratio f = 1 kHz, V
IN
=18
mV, A-Weighted
LMV1012-07 59
dB
LMV1012-15 60
LMV1012-20 61
LMV1012-25 61
V
IN
Max Input Signal f = 1 kHz and
THD+N <1%
LMV1012-07 170
mV
PP
LMV1012-15 100
LMV1012-20 55
LMV1012-25 28
V
OUT
Output Voltage V
IN
= GND LMV1012-07 4.45
4.38
4.65 4.80
4.85
V
LMV1012-15 4.34
4.28
4.56 4.74
4.80
LMV1012-20 4.40
4.30
4.58 4.75
4.85
LMV1012-25 4.45
4.39
4.65 4.83
4.86
f
LOW
Lower −3dB Roll Off Frequency R
SOURCE
=50Ω67 Hz
f
HIGH
Upper −3dB Roll Off Frequency R
SOURCE
=50Ω150 kHz
e
n
Output Noise A-Weighted LMV1012-07 −96
dBV
LMV1012-15 −89
LMV1012-20 −84
LMV1012-25 −82
THD Total Harmonic Distortion f = 1 kHz,
V
IN
=18mV
LMV1012-07 0.12
%
LMV1012-15 0.13
LMV1012-20 0.18
LMV1012-25 0.21
LMV1012 Analog Series
www.national.com3
5V Electrical Characteristics (Note 3) (Continued)
Unless otherwise specified, all limits guaranteed for T
J
= 25˚C, V
DD
= 5V, V
IN
= 18 mV, R
L
= 2.2 kΩand C = 2.2 µF.
Boldface limits apply at the temperature extremes.
Symbol Parameter Conditions
Min
(Note 4)
Typ
(Note 5)
Max
(Note 4) Units
C
IN
Input Capacitance 2pF
Z
IN
Input Impedance >1000 GΩ
A
V
Gain f = 1 kHz,
R
SOURCE
=50Ω
LMV1012-07 6.4
5.5
8.1 9.5
10.7
dB
LMV1012-15 14.0
13.1
15.6 16.9
17.5
LMV1012-20 19.2
17.0
21.1 22.3
23.5
LMV1012-25 22.5
21.2
23.9 25.0
25.8
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see the Electrical Characteristics.
Note 2: Human Body Model (HBM) is 1.5 kΩin series with 100 pF.
Note 3: Electrical Table values apply only for factory testing conditions at the temperature indicated. Factory testing conditions result in very limited self-heating of
the device such that TJ=T
A. No guarantee of parametric performance is indicated in the electrical tables under conditions of internal self-heating where TJ>TA.
Note 4: All limits are guaranteed by design or statistical analysis.
Note 5: Typical values represent the most likely parametric norm.
Note 6: The maximum power dissipation is a function of TJ(MAX) ,θJA and TA. The maximum allowable power dissipation at any ambient temperature is
PD=(T
J(MAX) -T
A)/θJA. All numbers apply for packages soldered directly into a PC board.
LMV1012 Analog Series
www.national.com 4
Connection Diagram
4-Bump micro SMD
20058703
Top View
Note: - Pin numbers are referenced to package marking text orientation.
- The actual physical placement of the package marking will vary slightly from part to part. The package will designate the date code and will vary considerably.
Package marking does not correlate to device type in any way.
Ordering Information
Package Part Number Package Marking Transport Media NSC Drawing
4-Bump Extreme Thin
micro SMD
(0.3 mm max height)
lead free only
LMV1012XP-15
Date Code
250 Units Tape and Reel
XPA04HLA
LMV1012XPX-15 3k Units Tape and Reel
LMV1012XP-25 250 Units Tape and Reel
LMV1012XPX-25 3k Units Tape and Reel
4-Bump Ultra-Thin
micro SMD
(0.4 mm max height)
lead free only
LMV1012UP-07
Date Code
250 Units Tape and Reel
UPA04GKA
LMV1012UPX-07 3k Units Tape and Reel
LMV1012UP-15 250 Units Tape and Reel
LMV1012UPX-15 3k Units Tape and Reel
LMV1012UP-20 250 Units Tape and Reel
LMV1012UPX-20 3k Units Tape and Reel
LMV1012UP-25 250 Units Tape and Reel
LMV1012UPX-25 3k Units Tape and Reel
4-Bump Thin
micro SMD
(0.5 mm max height)
lead free only
LMV1012TP-07
Date Code
250 Units Tape and Reel
TPA04GKA
LMV1012TPX-07 3k Units Tape and Reel
LMV1012TP-15 250 Units Tape and Reel
LMV1012TPX-15 3k Units Tape and Reel
LMV1012TP-25 250 Units Tape and Reel
LMV1012TPX-25 3k Units Tape and Reel
LMV1012 Analog Series
www.national.com5
Typical Performance Characteristics Unless otherwise specified, V
S
= 2.2V, R
L
= 2.2 kΩ,
C = 2.2 µF, single supply, T
A
= 25˚C
Supply Current vs. Supply Voltage (LMV1012-07) Supply Current vs. Supply Voltage (LMV1012-15)
20058718 20058704
Supply Current vs. Supply Voltage (LMV1012-20) Supply Current vs. Supply Voltage (LMV1012-25)
20058724 20058719
Gain and Phase vs. Frequency (LMV1012-07) Gain and Phase vs. Frequency (LMV1012-15)
20058714 20058705
LMV1012 Analog Series
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Typical Performance Characteristics Unless otherwise specified, V
S
= 2.2V, R
L
= 2.2 kΩ,
C = 2.2 µF, single supply, TA= 25˚C (Continued)
Gain and Phase vs. Frequency (LMV1012-20) Gain and Phase vs. Frequency (LMV1012-25)
20058725 20058713
Total Harmonic Distortion vs. Frequency (LMV1012-07) Total Harmonic Distortion vs. Frequency (LMV1012-15)
20058720 20058706
Total Harmonic Distortion vs. Frequency (LMV1012-20) Total Harmonic Distortion vs. Frequency (LMV1012-25)
20058726 20058721
LMV1012 Analog Series
www.national.com7
Typical Performance Characteristics Unless otherwise specified, V
S
= 2.2V, R
L
= 2.2 kΩ,
C = 2.2 µF, single supply, TA= 25˚C (Continued)
Total Harmonic Distortion vs. Input Voltage
(LMV1012-07)
Total Harmonic Distortion vs. Input Voltage
(LMV1012-15)
20058722 20058707
Total Harmonic Distortion vs. Input Voltage
(LMV1012-20)
Total Harmonic Distortion vs. Input Voltage
(LMV1012-25)
20058727 20058723
Output Noise vs. Frequency (LMV1012-07) Output Noise vs. Frequency (LMV1012-15)
20058717 20058715
LMV1012 Analog Series
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Typical Performance Characteristics Unless otherwise specified, V
S
= 2.2V, R
L
= 2.2 kΩ,
C = 2.2 µF, single supply, TA= 25˚C (Continued)
Output Noise vs. Frequency (LMV1012-20) Output Noise vs. Frequency (LMV1012-25)
20058728 20058716
LMV1012 Analog Series
www.national.com9
Application Section
HIGH GAIN
The LMV1012 series provides outstanding gain versus the
JFET and still maintains the same ease of implementation,
with improved gain, linearity and temperature stability. A high
gain eliminates the need for extra external components.
BUILT IN GAIN
The LMV1012 is offered in 0.3 mm height space saving
small 4-pin micro SMD packages in order to fit inside the
different size ECM canisters of a microphone. The LMV1012
is placed on the PCB inside the microphone.
The bottom side of the PCB usually shows a bull’s eye
pattern where the outer ring, which is shorted to the metal
can, should be connected to the ground. The center dot on
the PCB is connected to the V
DD
through a resistor. This
phantom biasing allows both supply voltage and output sig-
nal on one connection.
A-WEIGHTED FILTER
The human ear has a frequency range from 20 Hz to about
20 kHz. Within this range the sensitivity of the human ear is
not equal for each frequency. To approach the hearing re-
sponse weighting filters are introduced. One of those filters
is the A-weighted filter.
The A-weighted filter is usually used in signal to noise ratio
measurements, where sound is compared to device noise.
This filter improves the correlation of the measured data to
the signal to noise ratio perceived by the human ear.
MEASURING NOISE AND SNR
The overall noise of the LMV1012 is measured within the
frequency band from 10 Hz to 22 kHz using an A-weighted
filter. The input of the LMV1012 is connected to ground with
a 5 pF capacitor, as in Figure 3. Special precautions in the
internal structure of the LMV1012 have been taken to reduce
the noise on the output.
The signal to noise ratio (SNR) is measured witha1kHz
input signal of 18 mV
PP
using an A-weighted filter. This
represents a sound pressure level of 94 dB SPL. No input
capacitor is connected for the measurement.
SOUND PRESSURE LEVEL
The volume of sound applied to a microphone is usually
stated as a pressure level referred to the threshold of hear-
ing of the human ear. The sound pressure level (SPL) in
decibels is defined by:
Sound pressure level (dB) = 20 log P
m
/P
O
Where,
P
m
is the measured sound pressure
P
O
is the threshold of hearing (20 µPa)
In order to be able to calculate the resulting output voltage of
the microphone for a given SPL, the sound pressure in dB
20058702
FIGURE 1. Built in Gain
20058709
FIGURE 2. A-Weighted Filter
20058710
FIGURE 3. Noise Measurement Setup
LMV1012 Analog Series
www.national.com 10
Application Section (Continued)
SPL needs to be converted to the absolute sound pressure
in dBPa. This is the sound pressure level in decibels referred
to 1 Pascal (Pa).
The conversion is given by:
dBPa = dB SPL + 20*log 20 µPa
dBPa=dBSPL-94dB
Translation from absolute sound pressure level to a voltage
is specified by the sensitivity of the microphone. A conven-
tional microphone has a sensitivity of -44 dBV/Pa.
Example: Busy traffic is 70 dB SPL
V
OUT
= 70 −94 −44 = −68 dBV
This is equivalent to 1.13 mV
PP
Since the LMV1012-15 has a gain of 6 (15.6 dB) over the
JFET, the output voltage of the microphone is 6.78 mV
PP
.By
implementing the LMV1012-15, the sensitivity of the micro-
phone is -28.4 dBV/Pa (−44 + 15.6).
LOW FREQUENCY CUT OFF FILTER
To reduce noise on the output of the microphone a low
frequency cut off filter has been implemented. This filter
reduces the effect of wind and handling noise.
It’s also helpful to reduce the proximity effect in directional
microphones. This effect occurs when the sound source is
very close to the microphone. The lower frequencies are
amplified which gives a bass sound. This amplification can
cause an overload, which results in a distortion of the signal.
The LMV1012 is optimized to be used in audio band appli-
cations. By using the LMV1012, the gain response is flat
within the audio band and has linearity and temperature
stability Figure 5.
NOISE
Noise pick-up by a microphone in cell phones is a well-
known problem. A conventional JFET circuit is sensitive for
noise pick-up because of its high output impedance, which is
usually around 2.2 kΩ.
RF noise is amongst other caused by non-linear behavior.
The non-linear behavior of the amplifier at high frequencies,
well above the usable bandwidth of the device, causes AM-
demodulation of high frequency signals. The AM modulation
contained in such signals folds back into the audio band,
thereby disturbing the intended microphone signal. The
GSM signal of a cell phone is such an AM-modulated signal.
The modulation frequency of 216 Hz and its harmonics can
be observed in the audio band. This kind of noise is called
bumblebee noise.
RF noise caused by a GSM signal can be reduced by
connecting two external capacitors to ground, see Figure 6.
One capacitor reduces the noise caused by the 900 MHz
carrier and the other reduces the noise caused by 1800/
1900 MHz.
20058711
FIGURE 4. dB SPL to dBV Conversion
20058712
FIGURE 5. LMV1012-15 Gain vs. Frequency Over
Temperature
LMV1012 Analog Series
www.national.com11
Application Section (Continued)
20058708
FIGURE 6. RF Noise Reduction
LMV1012 Analog Series
www.national.com 12
Physical Dimensions inches (millimeters) unless otherwise noted
NOTE: UNLESS OTHERWISE SPECIFIED.
1. FOR SOLDER BUMP COMPOSITION, SEE "SOLDER INFORMATION" IN THE PACKAGING SECTION OF THE NATIONAL SEMICONDUCTOR WEB
PAGE (www.national.com).
2. RECOMMEND NON-SOLDER MASK DEFINED LANDING PAD.
3. PIN A1 IS ESTABLISHED BY LOWER LEFT CORNER WITH RESPECT TO TEXT ORIENTATION.
4. XXX IN DRAWING NUMBER REPRESENTS PACKAGE SIZE VARIATION WHERE X1 IS PACKAGE WIDTH, X2 IS PACKAGE LENGTH AND X3 IS
PACKAGE HEIGHT.
5. REFERENCE JEDEC REGISTRATION MO-211. VARIATION CA.
4-Bump Extreme Thin micro SMD
NS Package Number XPA04HLA
X1 = 0.955 mm X2 = 1.031 mm X3 = 0.300 mm
LMV1012 Analog Series
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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
NOTE: UNLESS OTHERWISE SPECIFIED.
1. FOR SOLDER BUMP COMPOSITION, SEE "SOLDER INFORMATION" IN THE PACKAGING SECTION OF THE NATIONAL SEMICONDUCTOR WEB
PAGE (www.national.com).
2. RECOMMEND NON-SOLDER MASK DEFINED LANDING PAD.
3. PIN A1 IS ESTABLISHED BY LOWER LEFT CORNER WITH RESPECT TO TEXT ORIENTATION.
4. XXX IN DRAWING NUMBER REPRESENTS PACKAGE SIZE VARIATION WHERE X1 IS PACKAGE WIDTH, X2 IS PACKAGE LENGTH AND X3 IS
PACKAGE HEIGHT.
5. REFERENCE JEDEC REGISTRATION MO-211. VARIATION CA.
4-Bump ULTRA-Thin micro SMD
NS Package Number UPA04GKA
X1 = 0.93 mm X2 = 1.006 mm X3 = 0.400 mm
LMV1012 Analog Series
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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
NOTE: UNLESS OTHERWISE SPECIFIED.
1. EPOXY COATING.
2. 63Sn/37Pb EUTECTIC BUMP.
3. RECOMMEND NON-SOLDER MASK DEFINED LANDING PAD.
4. PIN A1 IS ESTABLISHED BY LOWER LEFT CORNER WITH RESPECT TO TEXT ORIENTATION PINS ARE NUMBERED COUNTERCLOCKWISE.
5. XXX IN DRAWING NUMBER REPRESENTS PACKAGE SIZE VARIATION WHERE X1 IS PACKAGE WIDTH, X2 IS PACKAGE LENGTH AND X3 IS
PACKAGE HEIGHT.
6. REFERENCE JEDEC REGISTRATION MO-211. VARIATION BC.
4-Bump Thin micro SMD
NS Package Number TPA04GKA
X1 = 0.93 mm X2 = 1.006 mm X3 = 0.500 mm
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the right at any time without notice to change said circuitry and specifications.
For the most current product information visit us at www.national.com.
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LMV1012 Analog Series Pre-Amplified IC’s for High Gain 2-Wire Microphones
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