After Sales
Technical Documentation
Handset HSU–1
Page – 4
Original 50/96
Technical Specifications
Modes of Operation
DG–1 module has only one mode of operation. Audio paths will become
active when the handset is lifted from the cradle. Otherwise muting is on.
Maximum Ratings
–supply voltage: 16.0 V
–operation temperature range, specification: – 25 ––– + 55 C
–operation temperature range, operational: – 25 ––– + 85 C
–storage temperature range: – 40 ––– + 85 C
DC Characteristics
Symbol Parameter Minimum Typical/ Maximum
Nominal
VBS Supply voltage for electronics 9.0 V 13.2 V 16.0 V
Ihs Handset current consumption 6.0 mA 8.0 mA 12.0 mA
Vaudio Regulated audio voltage 7.7 V 8.3 V 8.7 V
Iaudio Audio current consumption 6.0 mA 8.0 mA 12.0 mA
AC Characteristics
Microphone Side
Microphone amplifier gain for nominal signal is approx. 30 dB. Max output
level is 1 Vrms. Idle noise of microphone amplifier should be less than
–64 dBmOp (220 uV). Output impedance is < 300 ohms.
Earphone Side
Earphone amplifier input level is max. 503 mVrms. Acoustic idle noise of
earphone is under –60 dBPa. Input impedance of earphone amplifier is >
10 kohm.
Sidetone
To be defined later.
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