MP34DB01

MP34DB01 MEMS audio sensor omnidirectional digital microphone Datasheet − production data Features ■ Single supply voltage ■ Low power consumption ■ 120 dBSPL acoustic overload point ■ 62.6 dB signal-to-noise ratio ■ Omnidirectional sensitivity ■ –26 dBFS sensitivity ■ PDM single-bit output with option for stereo configuration ■ RHLGA 3x4x1 4LD RHLGA package – Bottom-port design – SMD-compliant – EMI-shielded – ECOPACK®, RoHS and “Green” compliant Applications ■ Mobile terminals ■ Laptop and notebook computers ■ Portable media players ■ VoIP ■ Speech recognition ■ A/V eLearning devices ■ Gaming and virtual reality input devices ■ Digital still and video cameras ■ Antitheft systems Table 1. Description The MP34DB01 is an ultra-compact, low-power, omnidirectional, digital MEMS microphone built with a capacitive sensing element and an IC interface with stereo operation capability. The sensing element, capable of detecting acoustic waves, is manufactured using a specialized silicon micromachining process dedicated to produce audio sensors. The IC interface is manufactured using a CMOS process that allows designing a dedicated circuit able to provide a digital signal externally in PDM format. The MP34DB01 has an acoustic overload point of 120 dBSPL with a best on the market 62.6 dB signal-to-noise ratio and -26 dBFS sensitivity. The MP34DB01 is available in a bottom-port, SMD-compliant, EMI-shielded package and is guaranteed to operate over an extended temperature range from -40 °C to +85 °C. Device summary Part number Temperature range [°C] Package Packing MP34DB01 -40 to +85 RHLGA (3x4x1) mm 4LD Tray MP34DB01TR -40 to +85 RHLGA (3x4x1) mm 4LD Tape and reel July 2012 This is information on a product in full production. Doc ID 17924 Rev 8 1/16 www.st.com 1 Contents MP34DB01 Contents 1 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 Acoustic and electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.1 Acoustic and electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.2 Timing characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.3 Frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3 Sensing element . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 4 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 5 Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 5.1 L/R channel selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 6 Application recommendations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 2/16 Doc ID 17924 Rev 8 MP34DB01 List of tables List of tables Table 1. Table 2. Table 3. Table 4. Table 5. Table 6. Table 7. Table 8. Table 9. Table 10. Table 11. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Acoustic and electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Distortion specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Timing characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Frequency response mask for digital microphones . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 L/R channel selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Recommended soldering profile limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 RHLGA 3 mm x 4 mm x 1 mm 4-lead package dimensions . . . . . . . . . . . . . . . . . . . . . . . . 14 Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Doc ID 17924 Rev 8 3/16 List of figures MP34DB01 List of figures Figure 1. Figure 2. Figure 3. Figure 4. Figure 5. Figure 6. Figure 7. 4/16 Pin connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Timing waveforms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Typical frequency response normalized at 1 kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 MP34DB01 electrical connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 MP34DB01 electrical connections for stereo configuration . . . . . . . . . . . . . . . . . . . . . . . . 12 Recommended soldering profile limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 RHLGA 3 mm x 4 mm x 1 mm 4-lead package outline. . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Doc ID 17924 Rev 8 MP34DB01 1 Pin description Pin description Figure 1. Pin connections AM07238v1 Table 2. Pin description Pin # Pin name Function 1 CLK Synchronization input clock 2 LR Left/right channel selection 3 Vdd Power supply 4 DOUT 5 (ground ring) GND Left/right PDM data output 0 V supply Doc ID 17924 Rev 8 5/16 Acoustic and electrical specifications MP34DB01 2 Acoustic and electrical specifications 2.1 Acoustic and electrical characteristics The values listed in the table below are specified for Vdd = 1.8 V, Clock = 2.4 MHz, T = 25 °C, unless otherwise noted. Table 3. Symbol Acoustic and electrical characteristics Parameter Test condition Vdd Supply voltage Idd Current consumption in normal mode IddPdn Current consumption in power-down mode(3) Scc Short-circuit current AOP Acoustic overload point So Min. Typ.(1) Max. Unit 1.64 1.8 3.6 V Mean value(2) 0.65 mA 20 µA 1 10 120 at 1 kHz, 1 Pa SNR Signal-to-noise ratio A-weighted at 1 kHz, 1 Pa 62.6 dB PSR Power supply rejection Guaranteed by design -70 dBFS Clock TWK Input clock frequency Wake-up time 1 (5) -26 dBSPL Sensitivity (4) -29 mA 2.4 -23 dBFS 3.25 MHz 10 ms -40 +85 °C Guaranteed by design Top Operating temperature range VIOL Low level logic input/output voltage Iout = 1 mA -0.3 0.35xVdd V VIOH High level logic input/output voltage Iout = 1 mA 0.65xVdd Vdd+0.3 V 1. Typical specifications are not guaranteed. 2. No load on DOUT line. 3. Input clock in static mode. 4. Duty cycle: min = 40% max = 60% 5. Time from the first clock edge to valid output data. Table 4. 6/16 Distortion specifications Parameter Test condition Value Distortion 100 dBSPL (50 Hz - 4 kHz) < 1% THD + N Distortion 115 dBSPL (1 kHz) < 5% THD + N Doc ID 17924 Rev 8 MP34DB01 2.2 Acoustic and electrical specifications Timing characteristics Table 5. Timing characteristics Parameter Description fCLK Clock frequency for normal mode fPD Clock frequency for power-down mode TCLK Clock period for normal mode Data enabled on DATA line, L/R pin = 1 TR,DIS Data disabled on DATA line, L/R pin = 1 TL,DIS Max Unit 1 3.25 MHz 0.23 MHz 1000 ns 308 TR,EN TL,EN Min 30 (1) ns 16(1) Data enabled on DATA line, L/R pin = 0 30 (1) ns ns 16(1) Data disabled on DATA line, L/R pin = 0 ns 1. From design simulations Figure 2. Timing waveforms TCLK CLK TL,DIS TR,EN TR,DIS High Z PDM R High Z TL,EN PDM L High Z High Z AM045165v1 Doc ID 17924 Rev 8 7/16 Acoustic and electrical specifications 2.3 MP34DB01 Frequency response Figure 3. Typical frequency response normalized at 1 kHz 10 8 Normalized Sensitivity [dB] 6 4 2 0 -2 -4 -6 -8 -10 10 100 1000 10000 Frequency [Hz] Table 6. Frequency response mask for digital microphones Frequency / Hz (1) Lower limit Upper limit Unit 20...100 -5 +5 dBr 1kHz 100...8000 -2 +2 dBr 1kHz 8000...20000 -5 +5 dBr 1kHz 1. At T = 20 °C and acoustic stimulus = 1 Pa (94 dB SPL). 8/16 AM045317v1 Doc ID 17924 Rev 8 MP34DB01 3 Sensing element Sensing element The sensing element shall mean the acoustic sensor consisting of a conductive movable plate and a fixed plate placed in a tiny silicon chip. This sensor transduces the sound pressure into the changes of coupled capacity between those two plates. Omron Corporation supplies this element for STMicroelectronics. Doc ID 17924 Rev 8 9/16 Absolute maximum ratings 4 MP34DB01 Absolute maximum ratings Stresses above those listed as “absolute maximum ratings” may cause permanent damage to the device. This is a stress rating only and functional operation of the device under these conditions is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability. Table 7. Absolute maximum ratings Symbol Ratings Vdd Supply voltage Vin Input voltage on any control pin TSTG Storage temperature range ESD Electrostatic discharge protection Maximum value Unit -0.3 to 6 V -0.3 to Vdd +0.3 V -40 to +125 °C 2 (HBM) kV This device is sensitive to mechanical shock, improper handling can cause permanent damage to the part. This device is ESD-sensitive, improper handling can cause permanent damage to the part. 10/16 Doc ID 17924 Rev 8 MP34DB01 Functionality 5 Functionality 5.1 L/R channel selection The L/R digital pad lets the user select the DOUT signal pattern as explained in Table 8. The L/R pin must be connected to Vdd or GND. Table 8. L/R channel selection L/R CLK low CLK high GND Data valid High impedance Vdd High impedance Data valid Doc ID 17924 Rev 8 11/16 Application recommendations 6 MP34DB01 Application recommendations Figure 4. MP34DB01 electrical connections CLK DOUT C ODE C Vdd 100 nF 1 4 2 3 L/R 10 µF 5 Top view AM07964v1 Figure 5. MP34DB01 electrical connections for stereo configuration DOUT CLK C ODE C Vdd Mic2 Mic1 5 1 4 1 4 2 3 2 3 5 Top view Top view 100 nF 10 µF AM07965v1 Power supply decoupling capacitors (100 nF ceramic, 10 µF ceramic) should be placed as near as possible to pin 3 of the device (common design practice). The L/R pin must be connected to Vdd or GND (refer to Table 8). 12/16 Doc ID 17924 Rev 8 MP34DB01 Package mechanical data In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK® packages, depending on their level of environmental compliance. ECOPACK® specifications, grade definitions and product status are available at: www.st.com. ECOPACK is an ST trademark. Soldering information The RHLGA (3 x 4 x 1) mm package is also compliant with the RoHS and “Green” standards and is qualified for soldering heat resistance according to JEDEC J-STD-020. Landing pattern and soldering recommendations are available at www.st.com. Figure 6. Recommended soldering profile limits tp TP CRITICAL ZONE RAMP-UP TL to T P TL TSMAX TEMPERATURE 7 Package mechanical data tL TSMIN ts PREHEAT RAMP-DOWN T25°C to PEAK 30 Table 9. 60 90 120 150 180 TIME 210 240 270 300 330 360 390 AM045166v1 Recommended soldering profile limits Description Average ramp rate Parameter Pb free TL to TP 3 °C/sec max TSMIN TSMAX tS 150 °C 200 °C 60 sec to 120 sec Preheat Minimum temperature Maximum temperature Time (TSMIN to TSMAX) TSMAX to TL Ramp-up rate Time maintained above liquidous temperature Liquidous temperature tL TL 60 sec to 150 sec 217 °C Peak temperature TP 260 °C max Time within 5 °C of actual peak temperature 20 sec to 40 sec Ramp-down rate 6 °C/sec max Time 25 °C (t25 °C) to peak temperature 8 minutes max Doc ID 17924 Rev 8 13/16 Package mechanical data Figure 7. MP34DB01 RHLGA 3 mm x 4 mm x 1 mm 4-lead package outline E1 L2 C E K T2 T2 M // N2 G5xG5 Pin 1 Indicator K KC 1 3 2 T1 4 G2 T1 D2 G1 D1 Seating Plane N1 L1 KE D 2X G6 R1 G7 KD G8 Bottom Port Indicator E2 G3 A1 G4 Table 10. 8178743_E BOTTOM VIEW TOP VIEW RHLGA 3 mm x 4 mm x 1 mm 4-lead package dimensions mm Symbol 14/16 Min Typ Max A1 0.900 1.000 1.100 D1 3.900 4.000 4.100 D2 0.950 1.000 1.050 R1 0.350 0.400 0.450 E1 2.900 3.000 3.100 E2 1.450 1.500 1.550 L1 0.650 0.700 0.750 L2 0.850 0.900 0.950 N1 1.000 1.050 1.100 N2 0.400 0.450 0.500 T1 0.350 0.400 0.450 T2 0.550 0.600 0.650 G1 3.050 3.100 3.150 G2 3.750 3.800 3.850 G3 2.050 2.100 2.150 G4 2.750 2.800 2.850 G5 0.250 0.300 0.350 G6 0.050 0.100 0.150 G7 0.500 0.550 0.600 G8 0.800 0.850 0.900 M 0.100 K 0.050 Doc ID 17924 Rev 8 MP34DB01 8 Revision history Revision history Table 11. Document revision history Date Revision Changes 28-Mar-2011 1 Initial release 05-Apr-2011 2 Updated Table 3 and Table 5 21-Oct-2011 3 Added max. peak temperature TP to Table 9 18-Nov-2011 4 Updated SNR typical value in Table 3; document promoted from preliminary to full datasheet 04-Jan-2012 5 Updated Features and Description Updated Figure 3: Typical frequency response normalized at 1 kHz 20-Mar-2012 6 Added test condition criterion to PSR in Table 3: Acoustic and electrical characteristics 07-May-2012 7 Added VIOL, VIOH to Table 3: Acoustic and electrical characteristics 05-Jul-2012 8 Added Section 3: Sensing element Updated operating temperature range throughout datasheet Doc ID 17924 Rev 8 15/16 MP34DB01 Please Read Carefully: Information in this document is provided solely in connection with ST products. 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