Omnidirectional Microphone with Bottom Port and Analog Output ADMP404 Preliminary Technical Data FEATURES GENERAL DESCRIPTION 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 The ADMP404 is a high quality, low cost, 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 SNR and flat, wideband frequency response, resulting in natural sound with high intelligibility. 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. APPLICATIONS Smartphones and feature phones Digital video cameras Bluetooth headsets Video phones Teleconferencing systems 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 ASIC MEMS ADMP404 VDD MEMBRANE OUTPUT AMPLIFIER OUTPUT GND 08616-001 IMPEDANCE CONVERTER BACKPLATE Figure 1. Rev. PrH Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other 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. 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 Analog Devices, Inc. All rights reserved. ADMP404 Preliminary Technical Data TABLE OF CONTENTS Features .............................................................................................. 1 Connecting the ADMP404 to a Codec .......................................7 Applications ....................................................................................... 1 Connecting the ADMP404 to an Op Amp Gain Stage .............7 General Description ......................................................................... 1 PCB Land Pattern Layout .................................................................8 Functional Block Diagram .............................................................. 1 Handling Instructions .......................................................................9 Revision History ............................................................................... 2 Pick and Place Equipment ...........................................................9 Specifications..................................................................................... 3 Reflow Solder .................................................................................9 Absolute Maximum Ratings............................................................ 4 Board Wash ....................................................................................9 ESD Caution .................................................................................. 4 Reliability Specifications ................................................................ 10 Pin Configuration and Function Descriptions ............................. 5 Outline Dimensions ........................................................................11 Typical Performance Characteristics ............................................. 6 Ordering Guide ...........................................................................11 Applications Information ................................................................ 7 REVISION HISTORY Rev. PrH | Page 2 of 12 Preliminary Technical Data 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 PERFORMANCE Directionality Sensitivity Signal-to-Noise Ratio Equivalent Input Noise Frequency Response 1 Total Harmonic Distortion Power Supply Rejection Ratio Maximum Acoustic Input POWER SUPPLY Supply Voltage Supply Current OUTPUT CHARACTERISTICS Output impedance Output DC Offset Output Current Limit Polarity 1 2 Symbol Test Conditions/Comments Min 1 kHz, 94 dB SPL −41 SNR EIN THD PSRR Low frequency –3 dB point High frequency –3 dB point Deviation from flat response within pass band 105 dB SPL 217 Hz, 100 mV p-p square wave superimposed on VDD = 1.8 V Peak VDD IS Typ Max Unit −35 70 dBV dBA dBA SPL Hz kHz dB % dB 120 dB SPL Omni −38 62 32 100 15 −3 +2 3 1.5 ZOUT 3.6 250 200 0.8 90 Noninverting2 See Figure 4 and Figure 6. Positive going (increasing) pressure on the membrane results in a positive going (increasing) output voltage. Rev. PrH | Page 3 of 12 V µA Ω V µA ADMP404 Preliminary Technical Data ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Supply Voltage Sound Pressure Level (SPL) Mechanical Shock Vibration Temperature Range 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. Rating 3.6 V 160 dB 10,000 g Per MIL-STD-883 Method 2007, Test Condition B −40°C to +70°C ESD CAUTION CRITICAL ZONE TL TO TP tP TP TL tL TSMAX TSMIN tS RAMP-DOWN PREHEAT 08616-002 TEMPERATURE RAMP-UP t25°C TO PEAK TIME Figure 2. Recommended Soldering Profile Limits Table 3. Recommended Soldering Profile Limits Profile Feature Average Ramp Rate (TL to TP) Preheat Minimum Temperature (TSMIN) Maximum Temperature (TSMAX) Time (TSMIN to TSMAX), tS Ramp-Up Rate (TSMAX to TL) Time Maintained Above Liquidous (tL) Liquidous Temperature (TL) Peak Temperature (TP) Time Within 5°C of Actual Peak Temperature (tP) Ramp-Down Rate Time 25°C (t25°C) to Peak Temperature Sn63/Pb37 3°C/sec max Pb-Free 3°C/sec max 100°C 150°C 60 sec to 120 sec 3°C/sec 60 sec to 150 sec 183°C 240°C + 0°C/−5°C 10 sec to 30 sec 6°C/sec max 6 minute max 150°C 200°C 60 sec to 120 sec 3°C/sec 60 sec to 150 sec 217°C 260°C + 0°C/−5°C 20 sec to 40 sec 6°C/sec max 8 minute max Rev. PrH | Page 4 of 12 Preliminary Technical Data ADMP404 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS GND 1 2 OUTPUT 3 VDD TOP VIEW (TERMINAL SIDE DOWN) Not to Scale Figure 3. Pin Configuration Table 4. Pin Function Descriptions Pin No. 1 2 3 Mnemonic OUTPUT GND VDD Description Analog Output Signal. Ground. Power Supply. Rev. PrH | Page 5 of 12 08616-003 ADMP404 ADMP404 Preliminary Technical Data TYPICAL PERFORMANCE CHARACTERISTICS 10 10 8 4 0 2 (dB) SENSITIVITY (dB) 6 0 –2 –10 –4 –6 1k 08616-009 100 10k FREQUENCY (Hz) Figure 4. Frequency Response Mask –10 –30 –40 –50 –60 –70 10k FREQUENCY (Hz) 08616-005 PSRR (dB) –20 1k 1k 10k FREQUENCY (Hz) Figure 6. Typical Frequency Response (Measured) 0 –80 100 –20 100 Figure 5. Typical Power Supply Rejection Ratio vs. Frequency Rev. PrH | Page 6 of 12 08616-010 –8 –10 Preliminary Technical Data ADMP404 APPLICATIONS INFORMATION C1 0.1µF VDD GND OUTPUT GND Figure 8. ADMP404 Connected to the OP177 Op Amp MIC INPUT GND 08616-020 ADMP404 Figure 7. ADMP404 Connected to the Analog Devices ADAU1761 Codec Rev. PrH | Page 7 of 12 6 R2 ADAU1761 + C2 1µF + OUTPUT 7 GAIN = (R2 + R3)/R3 R3 GND GND U1 OP177 2 4 GND VDD 3 R1 10kΩ ADMP404 C1 0.1µF C2 1µF 08616-021 CONNECTING THE ADMP404 TO A CODEC CONNECTING THE ADMP404 TO AN OP AMP GAIN STAGE + The ADMP404 output can be connected to a dedicated codec microphone input (see Figure 7) or to a high input impedance gain stage (see Figure 8). A 0.1 µF ceramic capacitor (C1) at VDD placed close to the ADMP404 supply pins is used for testing and is recommended to adequately decouple the microphone from noise on the power supply. A 1 µF or larger dc-blocking tantalum capacitor (C2) is required at the output of the microphone. ADMP404 Preliminary Technical Data PCB LAND PATTERN LAYOUT solder paste stencil pattern layout is shown in Figure 10. The diameter of the sound hole in the PCB should be larger than the diameter of the sound port of the microphone. A minimum diameter of 0.5 mm is recommended. The recommended PCB land pattern for the ADMP404 should be laid out to a 1:1 ratio to the solder pads on the microphone package, as shown in Figure 9. Care should be taken to avoid applying solder paste to the sound hole in the PCB. A suggested 1.52 0.68 1.22 0.61 Ø1.55 1.90 Ø0.95 08616-007 0.61 0.90 Figure 9. PCB Land Pattern Layout 1.55/1.05 DIA. 0.225 CUT WIDTH (2×) 0.8 × 0.6 2× 0.2 × 45 TYP 1.52mm 08616-008 1.22 Figure 10. Suggested Solder Paste Stencil Pattern Layout Rev. PrH | Page 8 of 12 Preliminary Technical Data ADMP404 HANDLING INSTRUCTIONS PICK AND PLACE EQUIPMENT REFLOW SOLDER The MEMS microphone can be handled using standard pickand-place and chip shooting equipment. Care should be taken to avoid damage to the MEMS microphone structure as follows: For best results, the soldering profile should be in accordance with the recommendations of the manufacturer of the solder paste used to attach the MEMS microphone to the PCB. It is recommended that the solder reflow profile not exceed the limit conditions specified in Figure 2 and Table 3. • • • • Use a standard pickup tool to handle the microphone. Because the microphone hole is on the bottom of the package, the pickup tool can make contact with any part of the lid surface. Use care during pick-and-place to ensure that no high shock events above 20 kg are experienced because such events may cause damage to the microphone. Do not pick up the microphone with a vacuum tool that makes contact with the bottom side of the microphone. Do not pull air out of or blow air into the microphone port. Do not use excessive force to place the microphone on the PCB. BOARD WASH When washing the PCB, ensure that water does not make contact with the microphone port. Blow-off procedures and ultrasonic cleaning must not be used. Rev. PrH | Page 9 of 12 ADMP404 Preliminary Technical Data RELIABILITY SPECIFICATIONS The microphone sensitivity after stress must deviate by no more than ±3 dB from the initial value. Table 5. Stress Test Low Temperature Operating Life High Temperature Operating Life THB Temperature Cycle High Temperature Storage Low Temperature Storage Component CDM ESD Component HBM ESD Component MM ESD Description −40°C, 500 hours, powered +125°C, 500 hours, powered +65°C/85% relative humidity (RH), 500 hours, powered −40°C/+125°C, one cycle per hours, 100 cycles +150°C, 500 hours −40°C, 500 hours All pins, 0.5 kV All pins, 1.5 kV All pins, 0.2 kV Rev. PrH | Page 10 of 12 Preliminary Technical Data ADMP404 OUTLINE DIMENSIONS 3.06 REF 3.425 3.350 3.275 0.75 REF REFERENCE CORNER 1.08 1.52 0.30 BSC 0.30 BSC 0.90 × 0.68 (PINS 1, 3) 1.56 DIA. 1 2.575 2.500 2.425 2.21 REF 0.25 NOM DIA. 0.20 MIN THRU HOLE (SOUND PORT) 0.95 DIA. 0.54 REF 2 1.22 BSC 1.25 3 0.65 REF SIDE VIEW 0.64 REF 0.20 TYP × 45° BOTTOM VIEW 0.21 REF Figure 11. 3-Terminal Chip Array Small Outline No Lead Cavity [LGA_CAV] 3.35 mm × 2.50 mm Body (CE-3-2) Dimensions shown in millimeters 03-12-2010-A TOP VIEW 0.98 0.88 0.78 ORDERING GUIDE Model1 ADMP404ACEZ ADMP404ACEZ-RL ADMP404ACEZ-RL7 EVAL-ADMP404Z 1 2 Temperature Range −40°C to +70°C −40°C to +70°C −40°C to +70°C Package Description 3-Terminal LGA_CAV 3-Terminal LGA_CAV, 13” Tape and Reel 3-Terminal LGA_CAV, 7” Tape and Reel Evaluation Board Z = RoHS Compliant Part. This package option is halide free. Rev. PrH | Page 11 of 12 Package Option CE-3-22 CE-3-22 CE-3-22 Ordering Quantity 1 10,000 1,000 ADMP404 Preliminary Technical Data NOTES ©2010 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. PR09027-0-4/10(PrH) Rev. PrH | Page 12 of 12