View SPH0645LM4H-B_8362955.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

01 SPH0645LM4H-B rev b datasheet i2s output digital micr ophone typical applications ? small port able devices: wearables ? set-top box es: tv, gaming, remote controllers ? smart home de vices, internet of things, connected equipment the SPH0645LM4H-B is a miniature, low power, bottom port microphone with an i2s digital output. the solution consists of a proven high performance sisonic? acoustic sensor, a serial analog to digital convertor, and an interface to condition the signal into an industry standard 24 bits i2s format. the i2s interface simplifies the integration in the system and allow direct interconnect to digital processors, application processors and microcontroller. saving the need of an external audio codec, the SPH0645LM4H-B is perfectly suitable for portable applications where size and power consumption are a constraint. product features: ? high snr of 65db(a) ? lo w current of typ. 600 a ? i2s output: direct att ach to p ? multi modes: st andard >1mhz, ? 600ua / sleep <900khz, 10ua ? flat fr equency response ? rf shielded ? suppor ts dual microphones ? ultra- stable performance ? standar d smd reflow ? omnidirectional ? zer o-height mic? ? pack aged in sph 3.50 x 2.65 x 0.98 mm SPH0645LM4H-B ap pl ic at io n pr oc esso r fi lt er no co dec needed i2 s i2 s in te rface sph 0645l m4 h-b mi cr ophone knowles.com datasheet SPH0645LM4H-B rev b
02 absolute maximum ratings table 1: absolute maximum ratings parameter absolute maximum rating units vdd,clk,ws. sel to ground -0.3, +5.0 v input current 100 ma short circuit to/from data indefinite to ground or vdd sec temperature -40 to +100 oc stresses exceeding these absolute maximum ratings may cause permanent damage to the device. these are stress ratings only. functional operation at these or any other conditions beyond those indicated under acoustic & electrical specifications is not implied. exposure beyond those indicated under acoustic & electrical specifi- cations for extended periods may afect device reliability. acoustic & electrical specifications table 2: test conditions: 25 2c, 5520% r.h ., v dd =1.8v, f clock = 3.072 mhz with a .1uf decoupling capacitor across v dd and gnd, unless otherwise indicated parameter symbol conditions min. typ. max units directivity omnidirectional polarity increasing sound pressure output magnitude increases functional temperature functional with lower performance -40 100 c operating temperature specifications guaranteed 0 45 c supply voltage v dd 1.62 1.8 3.6 v clock frequency f clock 2048 3072 4096 khz sleep clock frequency f sleep 900 khz supply current2,3 i dd - 600 - a sleep current i ddsleeep 10 ua short circuit current i sc grounded data pin 2 - 10 ma sensitivity s 94 db spl @ 1 khz -29 -26 -23 dbfs signal to noise ratio snr 94 db spl @ 1 khz, a-weighted 65 - db(a) total harmonic distor- tion thd 94 db spl @ 1 khz, s = typ. - - 1 % total harmonic distor- tion thd 1% thd 94 110 db spl acoustic overload point aop 10% thd @ 1 khz, s = typ. - 120 - db spl power supply rejection ratio psrr 200 mvpp sine wave@1khz - 80 - db power supply rejection +noise psr+n 100 mvpp 1/8th duty cycle rectangular wave@217 hz, vdd = 1.8v, a-weighted -86 db(a) power-up time 4,5 t powerup v dd v(min) - - 50 ms knowles.com datasheet SPH0645LM4H-B rev b
03 microphone interface specifications table 3: table 2: test conditions: 25 2c, 5520% r.h ., vdd =1.8v, f clock = 3.072 mhz with a .1uf decoupling capacitor across v dd and gnd, unless otherwise indicated parameter symbol conditions min. typ. max units logic input high v ih 0.65xvdd - vdd+0.3 v logic input low v il -0.3 - 0.35xvdd v low high threshold vl-h 0.55xvdd 0.65xvdd v high low threshold vh-l 0.35xvdd 0.45xvdd v hysteresis width vhyst 0.10xvdd - 0.29xvdd v logic output high v oh iout = 2 ma 0.7*v dd - v dd v logic output low v ol iout = 2 ma 0 - 0.3 * vdd v select (high) v dd -0.2 - v dd v select (low) gnd - gnd+0.2 v select input c select 2 pf clock input c clk 2 pf clock duty cycle 40 50 60 % clock rise/fall time (input and output) t edge measured from 0.1 to 0.9 v dd - - 10 ns tie clock jitter tie time interval jitter on clk line 2 ns rms output load c load - - 120 pf data format l 18bit precision, the lsbs are filled with zeros 24 bits figure 1: hysteresis diagram knowles.com datasheet SPH0645LM4H-B rev b
04 figure 2: timing diagram parameter symbol min max unit note clk period t 244.14 488.28 ns clk pulse width high t hc 85.45 ns 35% of min.t(=244.14ns) clk pulse width low t lc 85.45 ns 35% of min.t(=244.14ns) ws setup time t sws 85.45 ns ws typically synchronized with clk falling, should be equal to t bil ws hold time t hws 85.45 ns ws typically synchronized with clk falling, should be equal to t bih data delay from clk rising edge t dc 65.92 ns receiver setup time t sr 178.22 ns transmitter hold time t htr 7 ns clock rise time measured from v l to v h t rc 3.75 ns performance is guaranteed only with sck edge time <=3.75ns. for slower edge time, operation is guaranteed but performance degradation might be expected. knowles.com datasheet SPH0645LM4H-B rev b
05 performance curves test conditions: 25 2c, 5520% r.h ., v dd =1.8v, f clock = 3.072 mhz with .1uf decoupling capacitor, unless otherwise indicated figure 3: typical free field response normalized to 1 khz figure 4: typical thd vs spl knowles.com datasheet SPH0645LM4H-B rev b
06 application notes hardware description a block diagram of the i2s microphone is shown in figure 7. the microphone consists of the following blocks, the mems transducer, the charge pump(red), the amplifier(yellow), the sigma delta convertor(green), the decimator(orange), the low pass filter(turquoise),and the tri-state control (gray). operating description the i2s microphone operates as follows: the charge pump(red) boosts vdd to a suitable level to bias the mems transducer. the mems converts an input sound pressure level (spl) to a voltage. the amplifier (yellow) bufers the output voltage of the mems and provides suficient drive to provide the sigma delta convertor a stable signal. the sigma delta convertor (green) converts the bufered analog signal into a serial pulse density modulated (pdm) signal. the decimator (orange) down-converts the pdm signal by a factor of 64, it also converts the single bit pdm signal to multi-bit pulse code modulated (pcm) signal. the low pass filter (turquoise), removes any remaining high frequency components in the pcm signal and improves the bandwidth of the decimator output. the tri-state control (gray) uses the state of the ws and select inputs to determine if the data pin is driven or tri-stated. this allows 2 microphones to operate on a single i2s port. when select =high the data pin drives the sdin bus when ws=high otherwise data= tri-state. when select =low the data pin drives the sdin bus when ws=low otherwise data= tri-state. operating modes the i2s has 2 modes of operation which are determined by the clock frequency normal and sleep mode. in addition the i2s microphone can be turned of by removing power from the vdd pin. figure 8 shows the various operating modes. active mode when vdd is applied the microphone senses the clock line, if the frequency is greater than 900khz , the microphone enters the normal mode of operation. in this mode the i2s master must provide the clk and ws signals as the microphone is an i2s slave device. sleep mode when vdd is applied the microphone senses the clock line, if the frequency is less than 900khz or completely of , the microphone enters the sleep mode of operation. in this mode the microphone tri-states the data pin and turns of internal circuits to reduce power consumption. powered down mode this mode is entered by removing vdd from the microphone. the presence of clk, ws and select, have no efect on this mode and the data pin is tri- stated. the powered down mic will not interfere with other devices on the i2s bus. ???? ?????? ???? ??? ??? ??? ??? ?? ???? ??? ???? ????? ??????? ?????? figure 5: block diagram of the i2s digital mic figure 6: i2s microphone state diagram knowles.com datasheet SPH0645LM4H-B rev b
07 interface description the sph0645lm4h microphone operates as an i2s slave. the master must provide the bclk and ws signals. the over sampling rate is fixed at 64 therefore the ws signal must be bclk/64 and synchronized to the bclk. clock frequencies from 2.048mhz to 4.096mhz are supported so sampling rates from 32khz to 64khz can be had by changing the clock frequency. the data format is i2s, 24 bit, 2s compliment, msb first. the data precision is 18 bits, unused bits are zeros. the sel pin determines when the microphone drives the data pin. when sel=h the data pin is driven when the ws=h, otherwise it is tri-stated (high impedance). when operating a single microphone on an i2s bus, a pull down resistor (100k ohms) should be placed from the data pin to ground to insure the bus capacitance is discharged ??? ?? ???? ??? ??? ? ? ????? ?? ????? ????? ??? ??? ? ? ????? ?? ????? ????? ? ????????? ? ????????? figure 7: timing diagram figure 8: system (stereo) connections notes: 1 . decoupling capacitors (c33, c35) mounted as close as possible are required for optimum snr. 2 . rf filter capacitors (c32,c34) in the range of 20-200pf may be needed depending on rf environment. 3 . if both decoupling and rf filter capacitors are used, the rf filter capacitors should be the closest to the microphone. 4 . detailed information on acoustic, mechanical, and system integration can be found in the latest sisonic? design guide application note. system connections knowles.com datasheet SPH0645LM4H-B rev b
08 system connections contd figure 8, shows how two i2s microphones can be connected on a single i2s bus. r41Cr44 are included to either dampen or terminate their respective traces. if the traces are electrically long then they should be controlled im- pedance traces with impedance in the 50-120 ohm range. electrically long traces are when the length of the trace (in inches) is => 2 times the rise/fall time (in ns). even if the traces are not electrically long, r41-r44 can be used as dampening resistors (27-51 ohms) to improve signal integrity by reducing overshoots and ringing caused by stray inductance and capacitance. in either case, r41-r44 are placed as close as possible to the device that drives the trace (signal source). the decoupling capaci- tors (c32-33, c34-35) are most efective if the trace inductance between the capacitor and microphone is mini- mized. this can be accomplished by using short wide traces. if a ground plane is used under the microphone then connect the capacitor ground pads directly to the plane with vias without any trace used. i2s timing and port configuration guidelines ? b clk period must be in the range shown in figure 2 ? w s must be synchronized(changing) on the falling edge of bclk ? w s must be bclk/64 ? the hold t ime (see figure 2) must be greater than the hold time of the receiver ? the mode must be i2s with msb dela yed 1 bclk cycle after ws changes layout guidelines good layout techniques are required for optimal noise, distortion, and signal integrity. suggested layout guidelines are described in knowles multi-mode digital microphone sph0641lm4h-1 application note. knowles.com datasheet SPH0645LM4H-B rev b
09 mechanical specifications item nominal tolerance units length (l) 3.50 0.10 mm width (w) 2.65 0.10 mm height (h) 0.98 0.10 mm acoustic port diameter (ap) 0.325 0.05 mm pin # pin name type description 1 ws digital input word strobe 2 select digital input select l/r 3 gnd power ground 4 bclk digital input bit clock 5 vdd power power supply 6 data out digital output digital data output example land pattern example solder stencil pattern notes: pick ar ea only extends to 0.25 mm of any edge or hole unless otherwise specified. dimensions ar e in millimeters unless otherwise specified. t olerance is 0.15mm unless otherwise specified det ailed information on ap size considerations can be found in the latest sisonic? design guide application note. f urther optimizations based on application should be performed. knowles.com datasheet SPH0645LM4H-B rev b
10 knowles.com datasheet SPH0645LM4H-B rev b packaging & marking detail model number sufix reel diameter quantity per reel SPH0645LM4H-B 8 13 5900 alpha character a: s : knowles sisonic? production e: kno wles engineering samples p: kno wles prototype samples 12345678: unique job identification number f or product traceability notes: dimensions are in millimet ers unless otherwise specified. vacuum pick up only in the pick area indicated in mechanical specifications. tape & r eel per eia-481. labels applied dir ectly to reel and external package. shelf life: tw elve (12) months when devices are to be stored in factory supplied, unopened esd moisture sensitive bag under maximum environmental conditions of 30c, 70% r.h. pin 1
11 knowles.com datasheet SPH0645LM4H-B rev b recommended reflow profile ti me 25 c to pe ak ra mp -dow n ra mp -up t sm in t smax t l t p t l t p t s pr eheat ti me 25c notes: based on ipc /jdec j-std-020 revision c. all temper atures refer to topside of the package, measured on the package body surface profile feature ph-free average ramp-up rate (t smax to t p ) 3c/second max. preheat ? temper ature min (t smin ) ? temper ature max (t smax ) ? time ( t smin to t smax ) (t s ) 150c 200c 60C180 seconds time maintained above: ? temper ature (t l ) ? time (t l ) 217c 60C150 seconds peak temperature (t p ) 260c time within 5c of actual peak temperature (t p ) 20C40 seconds ramp-down rate (t p to t smax ) 6c/second max time 25c to peak temperature 8 minutes max additional notes (a) msl (moisture sensitivity le vel) class 1. (b) maximum of 3 reflo w cycles is recommended. (c) in order t o minimize device damage: ? do not board w ash or clean after the reflow process. ? do not brush board with or without solv ents after the reflow process. ? do not directly e xpose to ultrasonic processing, welding, or cleaning. ? do not insert an y object in port hole of device at any time. ? do not apply ov er 30 psi of air pressure into the port hole. ? do not pull a vacuum o ver port hole of the microphone. ? do not apply a vacuum when r epacking into sealed bags at a rate faster than 0.5 atm/sec.
materials statement meets the requirements of the european rohs directive 2011/65/ec as amended. meets the requirements of the industry standard iec 61249-2-21:2003 for halogenated substances and knowles green materials standards policy section on halogen-free. ozone depleting substances are not used in the product or the processes used to make the product, including compounds listed in annex a, b, and c of the montreal protocol on substances that deplete the ozone layer. reliability specifications test description reflow 5 reflow cycles with peak temperature of +260c high temperature storage +105c environment for 1,000 hours (iec 68-2-2 test ba) low temperature storage -40c environment for 1,000 hours (iec 68-2-1 test aa) high temperature bias +105c environment while under bias for 1,000 hours (iec 68-2-2 test ba) low temperature bias -40c environment while under bias for 1,000 hours (iec 68-2-1 test aa) temperature/humidity bias +85c/85% r.h. environment while under bias for 1,000 hours (jesd22-a101a-b) thermal shock 100 cycles of air-air thermal shock from -40c to +125c with 15 minute soaks (iec 68-2-4) tumble test 300 random drops of test box on to steel base from 1.0m, 10 tumbles/minute vibration 16 minutes in each x, y, z axis from 20 to 2,000 hz with peak acceleration of 20 g (mil 883e, method 2007.2,a) mechanical shock 3 pulses of 10,000 g in each of the x, y, and z directions (iec 68-2-27 test ea) esd-hbm 3 discharges of 2kv direct contact to i/o pins (mil 883e, method 3015.7) esd-lid/gnd 3 discharges of 8kv direct contact to lid while unit is grounded (iec 61000-4-2) esd-mm 3 discharges of 200v direct contact to io pins (esd stm5.2) notes: microphones must meet all acoustic and electrical specifications before and af ter reliability testing. after 3 reflo w cycles, the sensitivity of the microphones shall not deviate more than 1 db from its initial value. specification revisions revision specification changes date a ecr 15-201 6/9/2015 information contained herein is subject to change without notice. it may be used by a party at their own discretion and risk. we do not guarantee any results or assume any liability in connection with its use. this publication is not to be taken as a license to operate under any existing patents. knowles 1151 maplewood drive itasca, illinois 60143 phone: (630) 250-5100 fax: (630) 250-0575 sales@knowles.com model/reference number: datasheet SPH0645LM4H-B 5hy% ? copyright 2015 knowles b 7/17/2015 corrected timing diagram ecr#15-251

▲Up To Search▲

Price & Availability of SPH0645LM4H-B

	To Download SPH0645LM4H-B Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .