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CS7331P-CAZR

P1-P3P4-P6P7-P9P10-P11
4 Cirrus Logic Confidential DS1165PP1
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 T
A
–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
2RC
----------------
=
5 Cirrus Logic Confidential DS1165PP1
CS7331P
3 Characteristics and Specifications
Table 3-3. Absolute Maximum Ratings
Absolute maximum ratings are stress ratings only. Permanent damage to the device may be caused by continuously operating at or beyond these limits.
Device functional operating limits and guaranteed performance specifications are given under electrical characteristics at the test conditions specified.
Parameter Symbol Min Max Units
Supply voltage
1
1.All voltages are measured with respect to GND.
VDD –0.3 4.2 V
Operating temperature range T
A
–40 +105 ºC
Storage temperature prior to soldering T
Stgp
—30ºC
Storage relative humidity prior to soldering RH
Stgp
—60%
Storage temperature after soldering T
Stg
–40 +105 ºC
ESD-sensitive device. The CS7331P is manufactured on a CMOS process. It is therefore generically susceptible to damage from
excessive static voltages. Proper ESD precautions must be taken during handling and storage of this device. This device is
qualified to current JEDEC ESD standards
Table 3-4. Acoustic and Electrical Characteristics
Test conditions (unless specified otherwise): GND = 0 V; voltages are with respect to ground; performance data taken with VDD = 1.8 V, R
L
= 10 k,
C
L
= 100 pF, T
A
= +25ºC, 55 ±15% RH; 1 kHz test signal.
Parameter
1
1.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.
Min Typ Max Units
Directivity Omnidirectional —
Polarity Positive sound pressure Positive output voltage —
Sensitivity –39 –38 –37 dBV
Acoustic overload THD < 10% — 124 — dB SPL
THD 94 dB SPL
114 dB SPL
120 dB SPL
—
—
—
0.04
0.3
1
—
—
—
%
%
%
SNR A-weighted — 63 — dB
DR A-weighted — 93 — dB
Acoustic noise floor A-weighted — 31 — dB SPL
Electrical noise floor A-weighted — –101 — dBV
PSRR (with respect to VDD) 217 Hz sine wave, 100 mV (peak-peak) — 62 — dB
PSR (with respect to VDD) 217 Hz square wave, 100 mV (peak-peak) — –88 — dBV
Frequency response –3 dB low frequency
+3 dB high frequency
—
—
85
15
—
—
Hz
kHz
Frequency response flatness 200 Hz–7 kHz –1 — +1 dB
Part-to-part phase matching 80–100 Hz
200 Hz
—
—
—
—
±10
±5
°
°
Current consumption —5560A
Output DC impedance — 200 400
6 Cirrus Logic Confidential DS1165PP1
CS7331P
4 Typical Performance
4 Typical Performance
4.1 Audio Frequency Response
Test conditions: VDD = 1.8 V, GND = 0 V, no output load.
Figure 4-1. Sensitivity vs. Audio Frequency (20 Hz–20 kHz)
4.2 Ultrasonic Frequency Response
Test conditions: VDD = 1.8 V, GND = 0 V, no output load.
Figure 4-2. Sensitivity vs. Ultrasonic Frequency (20 kHz–100 kHz)
P1-P3P4-P6P7-P9P10-P11

CS7331P-CAZR

Mfr. #:
Buy CS7331P-CAZR
Manufacturer:
Cirrus Logic
Description:
MEMS Microphones Compact Bottom Port Analog Mic
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