Hardware Interface Description - KORE Telematics
Hardware Interface Description - KORE Telematics
Hardware Interface Description - KORE Telematics
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XT55/56 <strong>Hardware</strong> <strong>Interface</strong> <strong>Description</strong><br />
Confidential / Released<br />
s<br />
6.5.5 Voiceband transmit path<br />
Test conditions:<br />
• The values specified below were tested to 1kHz and 0dB gain stage, unless otherwise<br />
stated.<br />
• Parameter setup: Audio mode = 5 for GSM_MICP1 to GSM_MICN1 and 6 for<br />
GSM_MICP2 to GSM_MICN2, inBbcGain= 0, inCalibrate = 32767, outBbcGain = 0,<br />
OutCalibrate = 16384, sideTone = 0<br />
Table 33: Voiceband transmit path<br />
Parameter Min Typ Max Unit Test condition/Remark<br />
Input voltage (peak to peak)<br />
GSM_MICP1 to GSM_MICN1,<br />
GSM_MICP2 to GSM_MICN2<br />
Input amplifier gain in 6dB steps<br />
(inBbcGain)<br />
1.03 V<br />
0 42 dB Set with AT^SNFI<br />
Fine scaling by DSP (inCalibrate) -∞ 0 dB Set with AT^SNFI<br />
Input impedance GSM_MIC1 50 kΩ<br />
Input impedance GSM_MIC2 2.0 kΩ<br />
Microphone supply voltage ON<br />
Ri = 4kΩ (GSM_MIC2 only)<br />
Microphone supply voltage OFF;<br />
Ri = 4kΩ (GSM_MIC2 only)<br />
Microphone supply in POWER<br />
DOWN mode<br />
2.57<br />
2.17<br />
1.77<br />
2.65<br />
2.25<br />
1.85<br />
2.73<br />
2.33<br />
1.93<br />
V<br />
V<br />
V<br />
0 V<br />
no supply current<br />
@ 100µA<br />
@ 200µA<br />
See Figure 16<br />
XT55/56_hd_v02.06a Page 106 of 125 17.12.2004
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