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WM7236E Schematic ( PDF Datasheet ) - Cirrus Logic

Teilenummer WM7236E
Beschreibung Low Power Bottom Port Digital Silicon Microphone
Hersteller Cirrus Logic
Logo Cirrus Logic Logo 




Gesamt 14 Seiten
WM7236E Datasheet, Funktion
WM7236E
Low Power Bottom Port Digital Silicon Microphone
DESCRIPTION
The WM7236 is a low-profile digital silicon microphone,
optimised for use with low-power ‘Always-onvoice control
applications, such as Cirrus Logic® SoundClear
software.
The WM7236 supports two operational modes, selected
according to the applied clock frequency. ‘Voice’ mode
provides low current consumption, and sufficient SNR
performance for speech recognition algorithms. ‘Hi-Fi
Record’ mode offers wide dynamic range, and class-
leading THD performance. Operation in the ultrasonic
band is also supported at high clock frequencies.
The WM7236 incorporates Cirrus Logic proprietary
CMOS/MEMS membrane technology, offering high
reliability and high performance in a miniature, low-profile
package. The WM7236 is designed to withstand the high
temperatures associated with automated flow solder
assembly processes. (Note that conventional microphones
can be damaged by this process.)
The WM7236 incorporates a high-performance ADC,
which outputs a single-bit data stream using Pulse Density
Modulation (PDM) encoding. The WM7236 supports
selectable left/right channel assignment for a two-channel
digital microphone interface, enabling efficient connection
of multiple microphones in stereo/array configurations.
The WM7236 offers tight tolerance on the microphone
sensitivity, giving reduced variation between parts. This
removes the need for in-line production calibration of part-
to-part microphone variations.
FEATURES
High SNR (63dB)
Low variation in sensitivity (±1dB tolerance)
Low current consumption
- 10μA (Sleep)
- 290μA (Voice mode)
- 980μA (Hi-Fi Record mode)
PDM digital audio output
Stereo/array operation
Proprietary ADC technology
- Reduced clock-jitter sensitivity
- Low noise floor
- Stable in overload condition
Bottom Port LGA Package
1.62V to 2.0V supply
APPLICATIONS
Mobile telephone handsets
Wearable devices
Portable media players
Digital cameras
Tablets and laptop computers
BLOCK DIAGRAM
WM7236
VDD
CHARGE
PUMP
CONTROL
3D VIEW
CLK
DAT
LRSEL
CMOS MEMS
Transducer
AMP
ADC
GND
4.00mm x 3.00mm x 1.00mm LGA package
http://www.cirrus.com
Copyright Cirrus Logic, Inc., 20142016
(All Rights Reserved)
Rev 4.0
MAY ‘16






WM7236E Datasheet, Funktion
WM7236E
Test Conditions: VDD=1.8V, 1kHz test signal, CLK=3.072MHz, CLOAD = 100pF, TA = 25°C, unless otherwise stated.
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP MAX
Digital Input / Output
Input HIGH Level
VIH
VDD = 1.8V ±10%
0.65
VDD
Input LOW Level
VIL VDD = 1.8V ±10%
0.35
VDD
Output HIGH Level
VOH
IOH = 1mA
0.9
VDD
Output LOW Level
VOL IOL = -1mA
0.1
VDD
Input capacitance (CLK)
3.5
Input leakage
-1 1
Pull-down resistance (LRSEL)
2.5
Maximum load capacitance
(DAT)
CLOAD
150
Short Circuit Output Current
DAT connected to GND
10
Miscellaneous
Current Consumption
(no load connected)
IVDD Sleep Mode,
CLK = 0Hz
Voice Mode,
CLK = 768kHz
10
290 400
Hi-Fi Record Mode,
CLK = 3.072MHz
980 1250
Hi-Fi Record Mode,
CLK = 3.84MHz
1010
1300
Start-up time
from VDD applied to output
within specification
10 50
from CLK applied to output
within specification
10 50
Impulse recovery time
from input sound pressure
below overload level to output
within specification
50
CLK frequency
Sleep Mode
0
Voice Mode
300
800
Hi-Fi Record Mode
2.2
4.9
Mode selection time
4
UNIT
V
V
V
V
pF
µA
M
pF
mA
µA
ms
ms
Hz
kHz
MHz
CLK
cycles
6 Rev 4.0

6 Page









WM7236E pdf, datenblatt
PACKAGE DIMENSIONS
WM7236E
12 Rev 4.0

12 Page





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