ANALOG DEVICES ADMP404 Service Manual
Omnidirectional Microphone with
Data Sheet
FEATURES
Tiny 3.35 mm × 2.50 mm × 0.88 mm surface-mount package
High SNR of 62 dBA
High sensitivity of −38 dBV
Flat frequency response from 100 Hz to 15 kHz
Low current consumption: <250 μA
Single-ended analog output
High PSRR of 70 dB
Compatible with Sn/Pb and Pb-free solder processes
RoHS/WEEE compliant
APPLICATIONS
Smartphones and feature phones
Teleconferencing systems
Digital video cameras
Bluetooth headsets
Video phones
Tab le ts
Bottom Port and Analog Output
ADMP404
GENERAL DESCRIPTION
The ADMP404 is a high quality, high performance, low power,
analog output bottom-ported omnidirectional MEMS microphone.
The ADMP404 consists of a MEMS microphone element, an
impedance converter, and an output amplifier. The ADMP404
sensitivity specification makes it an excellent choice for both
near field and far field applications. The ADMP404 has a high
signal-to-noise ratio (SNR) and flat, wideband frequency response,
resulting in natural sound with high intelligibility. Its low current
consumption enables long battery life for portable applications.
A built-in particle filter provides high reliability. The ADMP404
complies with the TIA-920 Telecommunications Telephone
Terminal Equipment Transmission Requirements for Wideband
Digital Wireline Telephones standard.
The ADMP404 is available in an ultraminiature 3.35 mm ×
2.50 mm × 0.88 mm surface-mount package. It is reflow solder
compatible with no sensitivity degradation. The ADMP404 is
halide free.
FUNCTIONAL BLOCK DIAGRAM
ADMP404
Rev. B
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Anal og Devices for its use, nor for any infringements of patents or ot her
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
OUTPUT
AMPLIF IER
POWER
VDD
Figure 1.
OUTPUT
GND
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 ©2010–2011 Analog Devices, Inc. All rights reserved.
08616-001
ADMP404 Data Sheet
TABLE OF CONTENTS
Features.............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 4
ESD Caution.................................................................................. 4
Pin Configuration and Function Descriptions............................. 5
Typical Performance Characteristics ............................................. 6
Applications Information ................................................................ 7
REVISION HISTORY
8/11—Rev. A to Rev. B
Changes to Figure 1.......................................................................... 1
Changes to Supply Voltage Parameter, Table 1............................. 3
Changes to Table 3............................................................................ 4
Added Connecting to Analog Devices, Inc., Audio Codecs
Section and Supporting Documents Section ................................ 7
Changes to Pick and Place Equipment Section
(20 kg to 10 kg).................................................................................. 9
Added LGA_CAV Tape and Reel Outline Dimensions,
Figure 12 ..........................................................................................11
Connecting to Analog Devices, Inc., Audio Codecs ................7
Supporting Documents ................................................................7
PCB Land Pattern Layout.................................................................8
Handling Instructions.......................................................................9
Pick and Place Equipment............................................................9
Reflow Solder .................................................................................9
Board Wash ....................................................................................9
Reliability Specifications................................................................ 10
Outline Dimensions....................................................................... 11
Ordering Guide .......................................................................... 11
12/10—Rev. 0 to Rev. A
Changes to Applications Section and General
Description Section...........................................................................1
Changes to Table 1.............................................................................3
Changes to Table 2.............................................................................4
7/10—Revision 0: Initial Version
Rev. B | Page 2 of 12
Data Sheet ADMP404
SPECIFICATIONS
TA = 25°C, VDD = 1.8 V, unless otherwise noted. All minimum and maximum specifications are guaranteed. Typical specifications are not
guaranteed.
Table 1.
Parameter Symbol Test Conditions/Comments Min Typ Max Unit
PERFORMANCE
Directionality Omni
Sensitivity 1 kHz, 94 dB SPL −41 −38 −35 dBV
Signal-to-Noise Ratio SNR 62 dBA
Equivalent Input Noise EIN 32 dBA SPL
Dynamic Range Derived from EIN and maximum acoustic input 88 dB
Frequency Response1 Low frequency −3 dB point 100 Hz
High frequency −3 dB point 15 kHz
Deviation limits from flat response within pass band −3/+2 dB
Total Harmonic Distortion THD 105 dB SPL 3 %
Power Supply Rejection Ratio PSRR 217 Hz, 100 mV p-p square wave superimposed on VDD = 1.8 V 70 dB
Maximum Acoustic Input Peak 120 dB SPL
POWER SUPPLY
Supply Voltage VDD 1.5 3.3 V
Supply Current IS 250 μA
OUTPUT CHARACTERISTICS
Output Impedance Z
Output DC Offset 0.8 V
Output Current Limit 90 μA
1
See and . Figure 4 Figure 6
200 Ω
OUT
Rev. B | Page 3 of 12
ADMP404 Data Sheet
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter Rating
Supply Voltage −0.3 V to +3.6 V
Sound Pressure Level (SPL) 160 dB
Mechanical Shock 10,000 g
Vibration
Per MIL-STD-883 Method 2007,
Test Condition B
Temperature Range −40°C to +70°C
T
P
T
L
T
SMAX
RAMP-UP
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ESD CAUTION
t
P
CRITICAL Z ONE
t
L
T
TO T
L
P
T
SMIN
TEMPERATURE
t
S
PREHEAT
t
25°C
TO PEAK
TIME
RAMP-DOWN
08616-002
Figure 2. Recommended Soldering Profile Limits
Table 3. Recommended Soldering Profile Limits
Profile Feature Sn/Pb Pb-Free
Average Ramp Rate (TL to TP) 1.25°C/sec maximum 1.25°C/sec maximum
Preheat
Minimum Temperature (T
Maximum Temperature (T
Time (T
Ramp-Up Rate (T
SMIN
to T
), tS 60 sec to 75 sec 60 sec to 75 sec
SMAX
to TL) 1.25°C/sec 1.25°C/sec
SMAX
) 100°C 150°C
SMIN
) 150°C 200°C
SMAX
Time Maintained Above Liquidous (tL) 45 sec to 75 sec ~50 sec
Liquidous Temperature (TL) 183°C 217°C
Peak Temperature (TP) 215°C + 3°C/−3°C 245°C + 0°C/−5°C
Time Within 5°C of Actual Peak Temperature (tP) 20 sec to 30 sec 20 sec to 30 sec
Ramp-Down Rate 3°C/sec maximum 3°C/sec maximum
Time 25°C (t
) to Peak Temperature 5 minute maximum 5 minute maximum
25°C
Rev. B | Page 4 of 12
Loading...