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SPH0645LM4H-B Schematic ( PDF Datasheet ) - Knowles

Teilenummer SPH0645LM4H-B
Beschreibung I2S Output Digital Microphone
Hersteller Knowles
Logo Knowles Logo 




Gesamt 12 Seiten
SPH0645LM4H-B Datasheet, Funktion
SPH0645LM4H-B
SPH0645LM4H-B
Rev B Datasheet
I2S  Output Digital Microphone
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)
• Low Current of typ. 600µA
• I2S Output: Direct attach to µP
• Multi modes: standard >1MHz,
• 600uA / sleep <900kHz, 10uA
• Flat Frequency Response
• RF Shielded
• Supports Dual Microphones
• Ultra-Stable Performance
• Standard SMD Reflow
• Omnidirectional
• Zero-Height Mic™
• Packaged in SPH 3.50 x 2.65 x 0.98 mm
Typical Applications
• Small portable devices: wearables
• Set-top boxes: TV, gaming, remote controllers
• Smart home devices, Internet of Things,
Connected equipment
SPH0645LM4H-B
Microphone
Filter
I2S
Interface
No Codec
Needed
I2S
Application
Processor
knowles.com
Datasheet SPH0645LM4H-B Rev B
01






SPH0645LM4H-B Datasheet, Funktion
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 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 8 shows
the various operating modes.



 









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.
Figure 6: I2S Microphone State Diagram
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 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.
knowles.com
Datasheet SPH0645LM4H-B Rev B
06

6 Page









SPH0645LM4H-B pdf, datenblatt
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
Revision
Specification Changes
Date
A ECR 15-201
B Corrected Timing Diagram ECR#15-251
6/9/2015
7/17/2015
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.
Model/Reference Number:
Datasheet SPH0645LM4H-B Rev B
© Copyright 2015 Knowles
Phone: (630) 250-5100
Fax: (630) 250-0575
Knowles
1151 Maplewood Drive
Itasca, Illinois 60143

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