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CS7250B датащи(PDF) 6 Page - Cirrus Logic

номер детали CS7250B
подробное описание детали  Digital MEMS Microphone with High Performance and Low Power Modes
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производитель  CIRRUS [Cirrus Logic]
домашняя страница  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS7250B датащи(HTML) 6 Page - Cirrus Logic

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6
DS1072PP1
CS7250B
3 Characteristics and Specifications
Table 3-4. Acoustic and Electrical Characteristics
Test conditions (unless specified otherwise):
VDD = 1.8 V, GND = 0 V, CLK = 3.072 MHz, TA = +25ºC, 55 ±15% RH, 1-kHz, 94 dB SPL test signal, no load on DATA pin.
Parameter 1
1.Performance measurements are specified with a low-pass brick-wall filter and, where noted, an A-weighted filter. The low-pass filter removes
out-of-band noise. The Low Power Mode is measured with a cut-off frequency of 8 kHz; all other measurements are with a 20 kHz cut-off frequency.
Min
Typ
Max
Units
General characteristics
Directivity
Omnidirectional
Polarity
Positive sound pressure
Increasing density of 1s
Sensitivity 2
2.Sensitivity is measured at production test 0.9 s after power up.
–37
–36
–35
dBFS
High Performance Mode
(CLK = 3.072 MHz)
Acoustic overload
THD < 10%
131
dB SPL
THD
94 dB SPL
125 dB SPL
0.2
1
%
%
SNR
A-weighted
66
dB
DR
A-weighted
103
dB
Acoustic noise floor
A-weighted
28
dB SPL
Electrical noise floor
A-weighted
–102
dBFS
PSR (with respect to VDD)
100 mV p-p, swept sine wave,
20 Hz–20 kHz, A-weighted
–90
dBFS
Low Power Mode
(CLK = 768 kHz)
Acoustic overload
THD < 10%
120
dB SPL
THD
117 dB SPL
1
%
SNR
20Hz–8kHz, A-weighted
62
dB
DR
20 Hz–8 kHz, A-weighted
88
dB
Acoustic noise floor
20 Hz–8 kHz, A-weighted
32
dB SPL
Electrical noise floor
20 Hz–8 kHz, A-weighted
–98
dBFS
PSR (with respect to VDD)
100 mV p-p, swept sine wave,
20 Hz–8 kHz, A-weighted
–90
dBFS
Frequency response
Frequency response
–3 dB low frequency
+3 dB high frequency
35
13
Hz
kHz
Frequency response flatness
200 Hz–8 kHz
–1
+1
dB
Digital I/O 3
3.Note that digital input pins should not be left unconnected or floating.
Input HIGH Level
0.65
VDD
V
Input LOW Level
0.35
VDD
V
Output HIGH Level
IOH = 1 mA 0.9 VDD
V
Output LOW Level
IOL = –1 mA
0.1
VDD
V
Input capacitance
3
5
pF
Input leakage
–1
1
A
Load capacitance (DATA)
200
pF
Miscellaneous
characteristics
Current consumption 4
4.Measured without a load on the DATA pin.
High Performance Mode, CLK = 3.072 MHz
Low Power Mode, CLK = 768 kHz
Standby Mode, CLK = 0 Hz
650
160
5
10
A
A
A
Startup time
From power applied to output within 0.5 dB
of sensitivity specification
—15—
ms
Mode-transition time
From Low Power Mode to High
Performance Mode
—10—
ms
CLK frequency range 5,6
5.High Performance and Low Power Modes are selected according to the CLK frequency.
6.Standby Mode is selected when the CLK input is stopped; this is a power-saving mode. Normal operation resumes automatically when the CLK input
frequency is within the specified operational limits. Note that the VDD supply is still required in Standby Mode.
High Performance Mode
Low Power Mode
Standby Mode
1.4
300
0
3.2
800
MHz
kHz
Hz


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