User's Manual

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Note d’étude / Technical document : URDx– OTL 5635.1– 007 / 70 230 Edition 03
Document Sagem Communications Reproduction et divulgation interdites
Sagem Communications document. Reproduction and disclosure prohibited
Figure 6: Filter and ESD protection of 32 ohms speaker
The impedance of audio chain (filter + speaker) must be lower than 32 Ohm.
3.2.2 Characteristics of the microphone and speaker recommended by Sagem
communications
3.2.2.1 Characteristics of the microphone recommended by Sagem communications
Item to be inspected Acceptance criterion
Sensitivity - 40 dB SPL +/-3 dB (0 dB = 1 V/Pa @ 1kHz)
Frequency response Limits (relatives values)
Freq. (Hz) Lower limit Upper limit
100 -1 1
200 -1 1
300 -1 1
1000 0 0
2000 -1 1
3000 -1.5 1.5
3400 -2 2
4000 -2 2
Current consumption 1 mA (maximum)
Operating voltage DC 1 to 3 V (minimum)
S / N ratio 55 dB minimum (A-Curve at 1 kHz, 1 Pa)
Directivity Omni-directional
Maximum input sound pressure level 100 dB SPL (1 kHz)
Maximum distortion 1%
Radio frequency protection Over 800 -1200 MHz and 1700 -2000 MHz, S/N ratio 50
dB minimum (signal 1 kHz, 1 Pa)
3.2.2.2 Characteristics of the speaker recommended by Sagem communications
Item to be inspected Acceptance criterion
Input power: rated / max 0.1W (Rate)
Audio chain impedance 32 ohm +/- 10% at 1V 1KHz
Frequency Range
300 Hz ～ 4.0 KHz
Sensitivity (S.P.L) >105 dB at 1KHz with IEC318 coupler,
HiLo
HSET_OUT_P
HSET_OUT_N
speaker
Ferrite Bead
Ferrite Bead
18pF
18pF
ESD protection
ESD protection