> 5.6 | Characteristics of the Audio Interface

> Table 31: | Characteristics of the audio interface

> Function | Signal name | IO | Parameter | Min. | Typ. | Max. | Unit
> Microphone | MICP, MICN | I | DC (no load) at MICP | 5.3 | 5.4 | 5.6 | V
> DC at MICP in POWER DOWN |  | 0V |  | V
> DC (no load) at MICN |  | 0 |  | V
> DC Resistance differential MICN, MICP (balanced) | 4.6 | 4.7 | 4.8 | kOhm
> Impedance Zi (balanced) | 3.9 | 4.0 | 4.1 | kOhm
> Input level Uimax |  |  | 0.6 | V PP
> Restricted Input level Uires 1 |  |  | 1.6 | V PP
> Gain range 6 dB steps | 0 |  | 42 | dB
> Frequency Range | 200 |  | 3900 | Hz
> fine scaling by DSP (inCalibrate) | - |  | 0 | dB
> Earpiece | EPP, EPN | O | Impedance (balanced) | 8 |  |  | Ohm
> AC output level UO Gain = 0dB @ 3.14 dBm0 no load |  | 5.97 |  | V PP
> Gain range | -18 |  | 0 | dB
> Gain accuracy |  |  | 0.8 | dB
> Frequency area | 200 |  | 3900 | Hz
> DC Offset (balanced) |  |  | 100 | mV
> Attenuation distortion for 200...3900Hz |  |  | 1 | dB
> Out-of-band discrimination |  | 70 |  | dB
> LEAudio |  |  | Length of Audio (Handset) cable |  |  | 3 | m

> 1
> At least one of the following conditions has to be met in order to exceed U imax = 0.6 Vpp up to the restricted voltage limit Uires = 1.6Vpp:
> - A call is established
> - The module is not in power down and the AT command “AT^SNFM=,1” was executed.
> If 0.6Vpp is exceeded under any other condition undervoltage shutdown may be caused.
> Unless otherwise stated, all specified values are valid for gain setting (gs) 0dB and 1kHz test signal.
> gs = 0dB means audio mode = 5, inBbcGain= 0, inCalibrate = 32767, outBbcGain = 0, OutCalibrate = 16384, sideTone = 0.
> The electrical characteristics of the voiceband part depend on the current audio mode selected by the AT command AT^SNFS. See Table 11: Audio modes.
> The audio modes 4 and 5 can be adjusted by parameters. Each audio mode is assigned a separate parameter set.