BHI NEDSP1068-PCBA, Руководство пользователя

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HBA09-001-70 HB-NEDSP1068
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Appendix B - Connections and Jumper settings
J2 – General Input/Output Port
Pin Designation
Use Operation
1 N0 Noise Cancelling level
Bit ‘1’ Selected when High, weak pull up
applied
2 N1 Noise Cancelling level
Bit ‘2’ Selected when High, weak pull up
applied
3 N2 Noise Cancelling level
Bit ‘4’ Selected when High, weak pull up
applied
4 TX or T Data TX/Beep out Control data or Audio Beep
5 Vin or + +Ve Supply +5 v to +18v DC
6 RX or R Data RX/Control
Button Control data or Control button input
7 0v or - Ground Ground
8 NOFF Noise cancel ON/OFF Selected when High
9 Audio In or I External Line Input Maximum 900mV input
10 Audio Out or
O
Audio Output Variable output up to 2.5v p-p
J4 – External Microphone and indicator Port
Pin Designation
Use Operation
1 In or I External Microphone External Microphone or low level audio
input
2 V+ or + Microphone Supply Separate Bias Supply 3v3 (3 pin
electrets)
3 Gnd or - Microphone Ground Ground
4 Scr or S Microphone Shield Ground
5 Ovr or O External Overload LED External Overload LED
Jumper Settings
Pre-amplifier gain
Gain A B
40 dB Soldered Open
50 dB Open Soldered
60 dB Open Open
AGC Attack & Release Times
‘AT’ link Attack Time A/R Link 1
& 2 Open
A/R Link 1
soldered
A/R Link 2
soldered
Open 0.11mS 440mS 220mS 55mS
Soldered 0.276mS 1140mS 550mS 138mS