User's Manual

9
OPENBRAIN Technologies Co., LTD.
Audio Characteristics
Symbol Parameter Min Typ Max Unit
Vain_max Input Full Scale at Maximum Gain 3 mVrms
Vain_min Input Full Scale at Minimum Gain 350 mVrms
BWain Bandwidth of Microphone Amplifier 20 kHz
IMPmic Mic Mode Input Impedance 20 kohm
IMPin Input Mode Input Impedance 130 ohm
Vsp_out Output Voltage Full Scale Swing(Differential) 2.0 Vp-p
Isp_out Output Current Drive (at Full Scale Swing) 10 20 40 mA
BWaout Output -3dB Bandwidth 18.5 kHz
Lres Allowed Load: Resistive 8 Open ohm
Lcap Allowed Load: Capacitive 500 pF
3.2. Current Consumption
Operating Mode
Connection Type UART Rate(kbps) Average
Unit
Page Scan - 115.2 0.49 mA
Inquiry and Page Scan - 115.2 0.83 mA
ACL 1.28s sniff
Master 38.4 0.37 mA
SCO HV1 Master/Slave 38.4 41 mA
SCO HV3 Master/Slave 38.4 21~26 mA
Standby Host Connection - 38.4 76 uA
Reset(RESETB low) - - 58 uA
* Operating Temp: +25℃, Measurement point: 1.8V VDD input terminal