Document
SPK0415HM4H-B
Digital High-SNR SiSonicTM Microphone
The SPK0415HM4H-B is a miniature, highperformance, low power, top port silicon digital microphone with a single bit PDM output. Using Knowles’ proven high performance SiSonicTM MEMS technology, the SPK0415HM4H-B consists of an acoustic sensor, a low noise input buffer, and a sigma-delta modulator. These devices are suitable for applications such as cellphones, smart phones, laptop computers, sensors, digital still cameras, portable music recorders, and other portable electronic devices where excellent audio performance and RF immunity are required. The high Signal-to-Noise-Ratio (SNR) of the SPK0415HM4H-B enhances the performance of far-field applications and many complex, multi-microphone algorithms.
Features: • Low Noise • Low Current • RF Shielded • PDM Output • Supports Dual Multiplexed Channels • Ultra-Stable Performance • Standard SMD Reflow • Omnidirectional
Revision: E Sheet 1 of 13
6/18/2013 ©2013 Knowles Electronics
SPK0415HM4H-B
1. ABSOLUTE MAXIMUM RATINGS
Parameter VDD, DATA to Ground CLOCK to Ground SELECT to Ground Input Current
Short Circuit Current to/from DATA Temperature Range
Absolute Maximum Rating -0.3, +5.0 -0.3, +5.0 -0.3, +5.0 ±5
Indefinite to Ground or VDD -40 to +100
Units V V V mA sec °C
Stresses exceeding these “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only. Functional operation at these or any other conditions beyond those indicated under “Acoustic & Electrical Specifications” is not implied. Exposure beyond those indicated under “Acoustic & Electrical Specifications” for extended periods may affect device reliability.
2. ACOUSTIC & ELECTRICAL SPECIFICATIONS
TEST CONDITIONS: 23 ±2°C, 55±20% R.H., VDD=1.8 V, FCLOCK=2.4 MHz, SELECT pin grounded, no load, unless otherwise indicated
Parameter Supply Voltage1 Supply Current1,2,3
Sleep Current3 Sensitivity1
Symbol VDD IDD ISLEEP S
Conditions
FCLOCK < 1 kHz 94 dB SPL @ 1 kHz
Min Typ Max Units 1.6 - 3.6 V - - 650 µA - 25 50 µA -29 -26 -23 dBFS
Signal to Noise Ratio SNR 94 dB SPL @ 1 kHz, A-weighted
-
61
- dB(A)
Total Harmonic Distortion
Acoustic Overload Point
THD AOP
94 dB SPL @ 1 kHz, S = Typ 10% THD @ 1 kHz, S = Typ
- .10 .35 %
119 122
-
dB SPL
Power Supply Rejection Ratio
PSRR
200 mVpp sinewave @ 1 kHz
-
39
-
dBV /FS
Power Supply Rejection
PSR
100 mVpp square wave @ 217 Hz, A-weighted
-
-71
-
dBFS (A)
DC Output
Fullscale = ±100
- -4 - % FS
Directivity
Omnidirectional
Polarity
Increasing sound pressure
Increasing density of 1’s
Data Format
½ Cycle PDM
Logic Input High VIH
0.65xVDD
-
3.6 V
Revision: E
Sheet 2 of 13
6/18/2013 ©2013 Knowles Electronics
SPK0415HM4H-B
Parameter
Symbol
Conditions
Min Typ Max Units
Logic Input Low Logic Output High
VIL VOH
IOUT = 1 mA
-0.3 - 0.35xVDD V
0.65xVDD
-
VDD V
Logic Output Low VOL
IOUT = 1 mA
0 - 0.35xVDD V
SELECT (high) SELECT (low)
VDD -0.2 -0.3
-
3.6 V 0.2 V.