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CS7331 データシート(PDF) 4 Page - Cirrus Logic

部品番号 CS7331
部品情報  Miniature Bottom Port Analog MEMS Microphone
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メーカー  CIRRUS [Cirrus Logic]
ホームページ  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS7331 データシート(HTML) 4 Page - Cirrus Logic

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4
DS1165F1
CS7331P
2 Typical Connection Diagram
2 Typical Connection Diagram
Figure 2-1. Typical Connection Diagram
The recommended connection of a CS7331P silicon microphone is shown in Fig. 2-1.
A DC-blocking capacitor is required on the OUTPUT pin. The capacitor must be correctly selected as it affects the cut-off
frequency of the output path. A low cut-off frequency is desirable to ensure there is no significant filtering of the audio
bandwidth.
The 3-dB cut-off frequency of the output path can be calculated using Eq. 2-1, where C is the output capacitance and R
is the input resistance of the audio codec.
Equation 2-1. Low-Pass Filter Calculation
A typical recommended configuration uses a 1-
F DC-blocking capacitor and a 20-k codec input impedance, which
results in a 3-dB cut-off frequency of 10 Hz or less. Tantalum electrolytic capacitors are particularly suitable for the
DC-blocking components as they offer high stability in a small package size.
It is also recommended to place a 0.1-
F decoupling capacitor close to the VDD pin of the CS7331P.
3 Characteristics and Specifications
Table 3-1. Parameter Definitions
Parameter
Definition
Sensitivity
A measure of the microphone output response to the acoustic pressure of a 1-kHz, 94 dB SPL (1 Pa RMS)
sine wave.
Total harmonic distortion (THD)
The ratio of the RMS sum of the harmonic distortion products in the specified bandwidth (see note) relative
to the RMS amplitude of the fundamental (i.e., test frequency) output.
Signal-to-noise ratio (SNR)
A measure of the difference in level between the output response of a 1-kHz, 94 dB SPL sine wave and the
idle noise output.
Dynamic Range (DR)
The ratio of the 10% THD microphone output level (in response to a sine wave input) and the idle noise
output.
Note: Unless otherwise specified, all performance measurements are specified with a 20-kHz, low-pass brick-wall filter and, where noted, an
A-weighted filter. The low-pass filter removes out-of-band noise.
Table 3-2. Recommended Operating Conditions
Parameter
Symbol
Min
Typ
Max
Units
Analog supply range
VDD
1.6
1.8
3.6
V
Ground
GND
0
V
Operating temperature range
TA
–40
+85
ºC
Audio Codec
OUTPUT
VDD
GND
1
F
C
INPUT
1.8 V
0.1
F
CS7331P
3-dB filter cut-off frequency
1
2
RC
----------------
=


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