SPH0645LM4H-B Datasheet by Knowles

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{( knowles SPH0645LM4H-B git Datasheet SPH0645LM4H-B No Codec Application
knowles.com Datasheet SPH0645LM4H-B Rev C
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The SPH0645LM4H-B is a miniature, low power, bottom port microphone with an I2S digital output.
The solution consists of a proven high performance SiSonicacoustic sensor, a serial Analog to
Digital convertor, and an interface to condition the signal into an industry standard 24-bit I2S format.
The I2S interface simplifies the integration in the system and allow direct interconnect to digital
processors, application processors and microcontrollerss. 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)
Low Current of typ. 600µA
I2S Output: Direct attach to µP
Multi modes: standard >1MHz,
600uA / sleep <1kHz, 3uA
Flat Frequency Response
RF Shielded
Supports Dual Microphones
Ultra-Stable Performance
Standard SMD Reflow
Omnidirectional
Bottom-Ported Microphone
3.50 x 2.65 x 0.98 mm SPH Package Size
Typical Applications
Small portable devices: wearables
Set-top boxes: TV, gaming, remote controllers
Smart home devices, Internet of Things,
Connected equipment
Application
Processor
ΣΔΤ Filter
No Codec
Needed
I2S
I2S
Interface
SPH0645LM4H-B
Microphone
SPH0645LM4H-B Rev C
Datasheet
I2S
Output Digital Microphone
Absolute Maximum Rat Table 1. Absolute Maximum Ralin s Acoustic & Electrical Spec Table 2. TEST CONDITlONS. 25 :Z’C‘ 55 Vdd and GND, unless alherwxse mdicaled 100 mVpp 1/alh duty cycle eclangular wave@217 Hz VDD = 1.8V A— hled
knowles.com Datasheet SPH0645LM4H-B Rev C
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Absolute Maximum Ratings
Table 1: Absolute Maximum Ratings
Parameter Absolute Maximum Rating Units
VDD, BCLK, WS, SELECT 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 Specifications” for extended periods may affect device reliability.
Acoustic & Electrical Specifications1
Table 2: TEST CONDITIONS: 25 ±2°C, 55±20% R.H., VDD =1.8V, fCLOCK = 3.072 MHz with a 0.1uF decoupling capacitor across
Vdd 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
1024
3072
4096
kHz
Sleep Clock Frequency
f
sleep
-
-
1
KHz
Supply Current2
I
DD
-
600
-
µA
Sleep Current IDDSLEEEP - 3 10 uA
Short Circuit Current ISC 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)
DC Offset
6
Fullscale = ±100 - 5 - %
Total Harmonic Distortion
THD
94 dB SPL @ 1 kHz, S = Typ.
-
0.2
1
%
Total Harmonic Distortion
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
3,4,5
tPOWERUP VDD ≥ V(min) - - 50 Ms
1 Sensitivity and Supply Current are 100% tested.
2 Idd varies with Cload according to: ΔIdd = 0.5*VDD*ΔCload*fCLOCK.
3 Valid microphones states are: Powered Down Mode (mic off), Sleep Mode (low current, DATA = high-Z, fast startup), and Active Mode.
4 Time from Fclock < 1 kHz to Isleep specification is met when transitioning from Active Mode to Sleep Mode.
5 Time from Fclock ≥ 1 MHz to all applicable specifications are met when transitioning from Sleep Mode to Active Mode.
6 DC offset can be removed from the PCM samples if desired by implementing a DC-blocking or high-pass filter.
Microphone Interface Spec Table 3. TEST CONDITlONS 25 :2"C‘ 55 Vdd and (3ND, unless olherwrse indicaled Clock Rise/Fall Time In ulandO ui l4— Vhysl —>" High - lmernal Logic Level Low —i—r— Vh-l Vl-h re 1 Hystere Dlagram Performance is guarameed only With SCK edge lime <=3.75ns, for="" slower="" edge="" lime,="" operaiion="" guaranteed="" bur="" performance="" will="" degrade.="">
knowles.com Datasheet SPH0645LM4H-B Rev C
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Microphone Interface Specifications
Table 3: TEST CONDITIONS: 25 ±2°C, 55±20% R.H., VDD =1.8V, fCLOCK = 3.072 MHz with a 0.1uF decoupling capacitor across
Vdd and GND, unless otherwise indicated
Parameter Symbol Conditions Min. Typ. Max Units
Logic Input High VIH 0.65xVDD - VDD+0.3 V
Logic Input Low VIL -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 VOH IOUT = 2 mA 0.7*VDD - VDD V
Logic Output Low VOL IOUT = 2 mA 0 - 0.3 * VDD V
SELECT (high) VDD -0.2 - VDD V
SELECT (low) GND - GND+0.2 V
Select Input CSELECT 2 pF
Clock Input CCLK 2 pF
Clock Duty Cycle 40 50 60 %
Clock Rise/Fall Time
(Input and Output)
tEDGE Measured from 0.1 to 0.9 VDD - - 10 ns
TIE Clock Jitter σ Time Interval Jitter on CLK line 2 ns RMS
Output Load CLOAD - - 120 pF
Data Format L 18-bit precision, the LSBs are filled with zeros 24 bits
CLK
WS
DATA
t
sr
t
HC
t
LC
T
t
sws
V
H
t
RC
V
L
t
hws
t
dc
t
htr
MSB
Figure 1: Hysteresis Diagram Figure 2: Timing Diagram
Parameter Symbol Min Max Unit Notes
CLK Period T 244.14 976.56 ns
CLK Pulse Width High tHC 85.45 ns 35% of min.T(=244.14ns)
CLK Pulse Width Low tLC 85.45 ns 35% of min.T(=244.14ns)
WS setup time tSWS 85.45 ns WS typically synchronized with CLK falling, should
be equal to tBIL
WS hold time tHWS 85.45 ns WS typically synchronized with CLK falling, should
be equal to tBIH
Data Delay from CLK Rising Edge tDC 65.92 ns
Receiver Setup time tsr 178.22 ns
Transmitter Hold Time thtr 7
ns
Clock Rise Time
Measured from VL to VH tRC 3.75 ns
Performance is guaranteed only with SCK edge time
<=3.75ns. For slower edge time, operation is
guaranteed but performance will degrade.
Low
High
Vhyst
Vl-h
Internal
Logic
Level
Vh-l
Frequency (Hz)
knowles.com Datasheet SPH0645LM4H-B Rev C
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Performance Curves
TEST CONDITIONS: 25 ±2°C, 55±20% R.H., VDD =1.8V, fCLOCK = 3.072 MHz with 0.1uF decoupling capacitor across Vdd and
GND, unless otherwise indicated
Figure 3: Typical Free Field Response Normalized to 1 kHz
Figure 4: Typical THD vs Input SPL
-10
-5
0
5
10
15
20
10 100 1,000 10,000
Sensitivity (dB)
Frequency (Hz)
1.024MHz
2.048MHz
3.072MHz
4.096MHz
0.1
1
10
94 100 106 112 118 124
THD (%)
SPL (dB)
1.024MHz
2.048MHz
3.072MHz
4.096MHz
knowles.com Datasheet SPH0645LM4H-B Rev C
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Application Notes
Hardware Description
A block diagram of the I2S microphone is shown in Figure 5.
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).
Figure 5: Block Diagram of the I2S Digital Mic
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) buffers the output voltage of the MEMs
and provides sufficient drive to provide the Sigma Delta
Convertor a stable signal.
The Sigma Delta Convertor (green) converts the buffered
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 off by removing power from the
VDD pin. Figure 6 shows the various operating modes.
Figure 6: I2S Microphone State Diagram
Active Mode
When Vdd is applied the microphone senses the CLOCK line,
if the frequency is greater than 1MHz, 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 1KHz or completely off, the
microphone enters the sleep mode of operation. In this mode,
the microphone tri-states the DATA pin and turns off 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 effect on this
mode and the DATA pin is tri-stated. The Powered Down Mic
will not interfere with other devices on the I2S bus.
Powered
Down
Mode
Active
Mode
Sleep
Mode
V
DD
= On
F
CLOCK
< 1 kHz
VDD = Off
I | | | | | | | m-u- n-Ipn (— \zs mnmwm —> Connections ex: (:32 m QMFF m 5‘ RM 51 W5 BCLK DIN I25 Master swusmwwa ‘“ ngure 8 Sysfiem (S|ereo) Connechons as close as gossxble
knowles.com Datasheet SPH0645LM4H-B Rev C
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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 1.024Mhz to 4.096MHz are supported so sampling rates
from 16KHz to 64KHz can be had by changing the clock
frequency.
The Data Format is I2S, 24-bit, 2’s compliment, MSB first. The
data precision is 18 bits; unused bits are zeros.
The SELECT pin determines when the microphone drives the
Data pin. When SELECT = HIGH the Data pin is driven when
the WS = HIGH, 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
System Connections
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 the 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 SiSonicTM Design Guide
application note.
I2S Left Mic Data
I2S Right Mic Data
Mun Mode D 9 al croghone SPH0641LM4
knowles.com Datasheet SPH0645LM4H-B Rev C
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System Connections Cont’d
Figure 8 shows how two I2S Microphones can be connected on a single I2S bus. R41R44 are included to dampen or terminate their
respective traces. If the traces are electrically long then they should be controlled impedance traces with impedance in the 50-120 Ohm
range. Traces are considered electrically long when the length of the trace (in inches) is greater than 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 to be placed as close as
possible to the device that drives the trace (signal source). The decoupling capacitors (C32-33, and C34-35) are most effective if the
trace inductance between the capacitor and microphone is minimized. 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
BCLK period must be in the range shown in Figure 2 and the table below it
WS must be synchronized (changing) on the falling edge of BCLK
WS must be BCLK/64
The Hold Time (see Figure 2) must be greater than the Hold Time of the Receiver
The mode must be I2S with MSB delayed 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-B Application Note.
.
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knowles.com Datasheet SPH0645LM4H-B Rev C
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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 Area only extends to 0.25 mm of any edge or hole unless otherwise specified.
Dimensions are in millimeters unless otherwise specified.
Tolerance is ±0.15mm unless otherwise specified
Detailed information on AP size considerations can be found in the latest SiSonicTM Design Guide
application note.
Further optimizations based on application should be performed.
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knowles.com Datasheet SPH0645LM4H-B Rev C
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Packaging & Marking Detail
Model Number Suffix Reel Diameter Quantity Per Reel
SPH0645LM4H-B 8 13 5900
Alpha Character A:
“S”: Knowles SiSonicTM Production
“E”: Knowles Engineering Samples
“P”: Knowles Prototype Samples
“12345678”:
Unique Job Identification Number for product traceability
Notes: Dimensions are in millimeters unless otherwise specified.
Vacuum pickup only in the pick area indicated in Mechanical Specifications.
Tape & reel per EIA-481.
Labels applied directly to reel and external package.
Shelf life: Twelve (12) months when devices are to be stored in factory supplied, unopened ESD moisture sensitive bag under maximum
environmental conditions of 30°C, 70% R.H.
Pin 1
Time 25°C to Peak —>: Preheat - Tempera re Min Ts - Temper re Ma TSMAX) - Time (TSMIN to TSMAX) (is) 1 50°C 200°C 60-180 seconds Time maintained above: . Tempe at . Time (IL) 21 7°C 60-150 seconds 10
knowles.com Datasheet SPH0645LM4H-B Rev C
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Recommended Reflow Profile
Profile Feature Pb-Free
Average Ramp-up rate (TSMAX to TP) 3°C/second max.
Preheat
Temperature Min (TSMIN)
Temperature Max (TSMAX)
Time (TSMIN to TSMAX) (tS)
150°C
200°C
60-180 seconds
Time maintained above:
Temperature (TL)
Time (tL)
217°C
60-150 seconds
Peak Temperature (TP) 260°C
Time within 5°C of actual Peak Temperature (tP) 20-40 seconds
Ramp-down rate (TP to TSMAX) 6°C/second max
Time 25°C to Peak Temperature 8 minutes max
Notes: Based on IPC/JDEC J-STD-020 Revision C.
All temperatures refer to topside of the package, measured on the package body surface
Additional Notes
(A) MSL (moisture sensitivity level) Class 1.
(B) Maximum of 3 reflow cycles is recommended.
(C) In order to minimize device damage:
Do not board wash or clean after the reflow process.
Do not brush board with or without solvents after the reflow process.
Do not directly expose to ultrasonic processing, welding, or cleaning.
Do not insert any object in port hole of device at any time.
Do not apply over 30 psi of air pressure into the port hole.
Do not pull a vacuum over port hole of the microphone.
Do not apply a vacuum when repacking into sealed bags at a rate faster than 0.5 atm/sec.
.
Time 25°C to Peak
Ramp-down
Ramp-up
T
SMIN
T
SMAX
T
L
T
P
t
L
t
P
t
S
Preheat
Time
25°C
16 minmes in each X. Y. Z axxs from 20 lo 2000 Hz wxlh peak aoceleraxion of 20 G MIL 883E, Melhod 2007.2,A IEC 61000-4-2 M
knowles.com Datasheet SPH0645LM4H-B Rev C
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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 +260°C
High Temperature Storage +105°C environment for 1,000 hours (IEC 68-2-2 Test Ba)
Low Temperature Storage -40°C environment for 1,000 hours (IEC 68-2-1 Test Aa)
High Temperature Bias +105°C environment while under bias for 1,000 hours (IEC 68-2-2 Test Ba)
Low Temperature Bias -40°C environment while under bias for 1,000 hours (IEC 68-2-1 Test Aa)
Temperature/Humidity Bias +85°C/85% R.H. environment while under bias for 1,000 hours (JESD22-A101A-B)
Thermal Shock 100 cycles of air-air thermal shock from -40°C to +125°C 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 after reliability testing.
After 3 reflow cycles, the sensitivity of the microphones shall not deviate more than 1 dB from its initial value.
Specification Revisions Added 1MH2 support and DC Offset. Correcled Sleep Mode clock and miscellaneous typographical errors. (ECR 17-1416) Model/Reference Number: Phone: (630) 250-5100 Knowles Dalesheet SPH0645LR4H Rev C Fax: (630) 250-0575 1151 Maplewood Drive © Copyright 2017 Knowles sales@knowles.com Itasca, Illinois 60143
knowles.com Datasheet SPH0645LM4H-B Rev C
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Specification Revisions
Revision Specification Changes Date
A Initial Release (ECR 15-201) 6/9/2015
B Corrected Timing Diagram (ECR 15-251) 7/17/2015
C
Added 1MHz support and DC Offset. Corrected Sleep Mode clock and miscellaneous
typographical errors. (ECR 17-1416)
2/1/2017
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.
Model/Reference Number:
Datasheet SPH0645LR4H-B Rev C
© Copyright 2017 Knowles
Phone: (630) 250-5100
Fax: (630) 250-0575
sales@knowles.com
Knowles
1151 Maplewood Drive
Itasca, Illinois 60143

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