SPH9855LM4H-C
SPH9855
AEC-Q103 QUALIFIED DIGITAL
BOTTOM PORT SISONIC™ MICROPHONE
The SPH9855LM4H-C is a high-performance, low power, bottom port
silicon digital microphone with a single bit PDM output. Using Knowles’
proven high performance SiSonic™ MEMS technology, the
SPH9855LM4H-C consists of an acoustic sensor, a low noise input
buffer, and a sigma-delta modulator. This microphone is ideally suited
for automotive applications, with Knowles providing the industry's first
AEC-Q103 qualified digital microphone. Its high, 66 dB(A), SNR and
132.5 dB SPL AOP provides a large, distortion-free dynamic range for
high-quality voice pickup. Additionally, it features a wide frequency
band for proximity detection and has a wide operating temperature
range for automotive applications. The SPH9855LM4H-C also provides
a tighter sensitivity distribution to improve beam forming applications.
Charge Pump
Vdd
Regulator
Control
SELECT
CLK
MEMS
Transducer
Buffer
Σ∆ ADC
DATA
GND
PRODUCT FEATURES
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ABSOLUTE MAXIMUM RATINGS
AEC-Q100/103 Qualified
Low Distortion / High AOP
High SNR
Low Current Consumption in LowPower Mode
Flat Frequency Response
High Drive Capability
RF Shielded
Bottom Port
±0.5dB Sensitivity Matching
Supports Dual Multiplexed Channels
Multiple Performance Modes (Sleep,
Low-Power, Normal)
Ultra-Stable Performance
Omnidirectional
Standard SMD Reflow
LGA Package
TYPICAL APPLICATIONS
Parameter
Absolute Maximum Rating
Units
• Automotive In-Cabin Active Noise
Cancellation
• Automotive eCall Communications
Systems
• Industrial Beam Forming
Applications
• Proximity Detection
knowles.com | DATASHEET SPH9855LM4H-C Rev A
© 2021, Knowles Electronics, LLC, Itasca, IL, USA, All Rights Reserved.
SiSonic, Knowles and the logo are trademarks of Knowles Electronics, LLC.
AEC-Q103 QUALIFIED DIGITAL
BOTTOM PORT SISONIC™ MICROPHONE
2
knowles.com | DATASHEET SPH9855LM4H-C Rev A
© 2021, Knowles Electronics, LLC, Itasca, IL, USA, All Rights Reserved.
SiSonic, Knowles and the logo are trademarks of Knowles Electronics, LLC.
AEC-Q103 QUALIFIED DIGITAL
BOTTOM PORT SISONIC™ MICROPHONE
ACOUSTIC & ELECTRICAL SPECIFICATIONS1
Parameter
3
Symbol
Conditions
Min
Typ
Max
knowles.com | DATASHEET SPH9855LM4H-C Rev A
© 2021, Knowles Electronics, LLC, Itasca, IL, USA, All Rights Reserved.
SiSonic, Knowles and the logo are trademarks of Knowles Electronics, LLC.
Units
AEC-Q103 QUALIFIED DIGITAL
BOTTOM PORT SISONIC™ MICROPHONE
Parameter
Symbol
Conditions
Min
Typ
Max
Units
Parameter
Symbol
Conditions
Min
Typ
Max
Units
4
knowles.com | DATASHEET SPH9855LM4H-C Rev A
© 2021, Knowles Electronics, LLC, Itasca, IL, USA, All Rights Reserved.
SiSonic, Knowles and the logo are trademarks of Knowles Electronics, LLC.
AEC-Q103 QUALIFIED DIGITAL
BOTTOM PORT SISONIC™ MICROPHONE
Parameter
Symbol
Conditions
Min
Typ
Max
Units
Parameter
Symbol
Conditions
Min
Typ
Max
Units
5
knowles.com | DATASHEET SPH9855LM4H-C Rev A
© 2021, Knowles Electronics, LLC, Itasca, IL, USA, All Rights Reserved.
SiSonic, Knowles and the logo are trademarks of Knowles Electronics, LLC.
AEC-Q103 QUALIFIED DIGITAL
BOTTOM PORT SISONIC™ MICROPHONE
1/Fclock
MIC1
Zrf
Vdd
Vih
Vdd
Tedge
CLOCK
Tedge
SEL
0.1µF
Vil
DATA
GND
DATA
(SELECT = Vdd)
Tdd
Thold
Voh
Vdd
High Z
Mic (High)
Data
Vdd
Zrf Rterm
SEL
0.1µF
Tdv
High Z
Tdd
Tdz
Rterm
PDM Mic
Interface
CLOCK
DATA
MIC2
Zrf
Vdd
Vol
DATA
(SELECT = Ground)
Vdd
Tdz
Tdv
CODEC OR
APPLICATION PROCESSOR
Zrf
CLOCK
Zrf
CLOCK
DATA
GND
GND
Zrf Rterm
Thold
Voh
Mic (Low)
Data
Vol
CODEC OR
APPLICATION PROCESSOR
Vdd
Vdd
MIC
Zrf
Vdd
Vdd
Vhyst
0.1µF
High
NC
SEL
Zrf
Rterm
CLOCK
DATA
GND
Zrf Rterm
PDM Mic
Interface
CLOCK
DATA
GND
Internal
Logic
Level
Low
Ext CLOCK
Input
Vh-l
Vl-h
Microphone
Normal Mode
1.1 MHz ≤ Fclock ≤ 4.8 MHz
1.65V ≤ Vdd ≤ 3.6V
SELECT
Asserts DATA on
Latch DATA on
Powered
Down
Mode
Vdd = 0V
Sleep Mode
Fclock < 250 kHz
1.65V ≤ Vdd ≤ 3.6V
6
Low-Power Mode
500 kHz ≤ Fclock ≤ 900 kHz
1.65V ≤ Vdd ≤ 3.6V
knowles.com | DATASHEET SPH9855LM4H-C Rev A
© 2021, Knowles Electronics, LLC, Itasca, IL, USA, All Rights Reserved.
SiSonic, Knowles and the logo are trademarks of Knowles Electronics, LLC.
AEC-Q103 QUALIFIED DIGITAL
BOTTOM PORT SISONIC™ MICROPHONE
PERFORMANCE CURVES
7
knowles.com | DATASHEET SPH9855LM4H-C Rev A
© 2021, Knowles Electronics, LLC, Itasca, IL, USA, All Rights Reserved.
SiSonic, Knowles and the logo are trademarks of Knowles Electronics, LLC.
AEC-Q103 QUALIFIED DIGITAL
BOTTOM PORT SISONIC™ MICROPHONE
8
knowles.com | DATASHEET SPH9855LM4H-C Rev A
© 2021, Knowles Electronics, LLC, Itasca, IL, USA, All Rights Reserved.
SiSonic, Knowles and the logo are trademarks of Knowles Electronics, LLC.
AEC-Q103 QUALIFIED DIGITAL
BOTTOM PORT SISONIC™ MICROPHONE
MECHANICAL SPECIFICATIONS
Item
Dimension
Example Land Pattern
9
Tolerance
Pin #
Pin Name
Type
Description
Example Solder Stencil Pattern
knowles.com | DATASHEET SPH9855LM4H-C Rev A
© 2021, Knowles Electronics, LLC, Itasca, IL, USA, All Rights Reserved.
SiSonic, Knowles and the logo are trademarks of Knowles Electronics, LLC.
AEC-Q103 QUALIFIED DIGITAL
BOTTOM PORT SISONIC™ MICROPHONE
PACKAGING & MARKING DETAIL
Model Number
10
Suffix
Reel Diameter
Quantity Per
Reel
Component
Surface Resistance (ohms)
knowles.com | DATASHEET SPH9855LM4H-C Rev A
© 2021, Knowles Electronics, LLC, Itasca, IL, USA, All Rights Reserved.
SiSonic, Knowles and the logo are trademarks of Knowles Electronics, LLC.
AEC-Q103 QUALIFIED DIGITAL
BOTTOM PORT SISONIC™ MICROPHONE
RECOMMENDED REFLOW PROFILE
tP
TP
RampTL
TSMAX
TSMIN
t
tS Preheat
Ramp-down
25°C
Time 25°C to Peak
Profile Feature
11
Time
Pb-Free
knowles.com | DATASHEET SPH9855LM4H-C Rev A
© 2021, Knowles Electronics, LLC, Itasca, IL, USA, All Rights Reserved.
SiSonic, Knowles and the logo are trademarks of Knowles Electronics, LLC.
AEC-Q103 QUALIFIED DIGITAL
BOTTOM PORT SISONIC™ MICROPHONE
MATERIALS STATEMENT
RELIABILITY SPECIFICATIONS
Test
12
Description
knowles.com | DATASHEET SPH9855LM4H-C Rev A
© 2021, Knowles Electronics, LLC, Itasca, IL, USA, All Rights Reserved.
SiSonic, Knowles and the logo are trademarks of Knowles Electronics, LLC.
AEC-Q103 QUALIFIED DIGITAL
BOTTOM PORT SISONIC™ MICROPHONE
SPECIFICATION REVISIONS
Revision
13
Specification Changes
Knowles Corporation
1151 Maplewood Drive
Itasca, Illinois 60143
Date
Phone: 1 (630) 250-5100
Fax: 1 (630) 250-0575
sales@knowles.com
Model/Reference Number:
Datasheet SPH9855LM4H-C Rev A
© Copyright 2021 Knowles