> 5.7.4 | Voiceband Receive Path

> Test conditions:

> • | The values specified below were tested to 1kHz with default audio mode settings, unless otherwise stated.

> • | Default audio mode settings are: mode=5 for EPP1 to EPN1 and mode=6 for EPP2 to EPN2, inBbcGain=0, inCalibrate=32767, outBbcGain=0, OutCalibrate=16384 (volume=4) or OutCalibrate=11585 (volume=3), sideTone=0.

> Table 36: | Voiceband receive path

> Parameter | Min | Typ | Max | Unit | Test condition / remark
> Maximum differential output voltage (peak to peak) EPP1 to EPN1 |  | 6.0 6.2 |  | V V | 8Ω , no load, Audio Mode 5, Volume 4 @ 3.14 dBm0 (Full Scale) Batt+ = 3.6V
> Maximum differential output voltage (peak to peak) EPP2 to EPN2 |  | 4.0 4.2 |  | V V | 32Ω, no load Audio Mode 6, Volume 31 @ 3.14 dBm0 (Full Scale)
> Nominal differential output voltage (peak to peak) EPP1 to EPN1 |  | 4.2 4.3 |  | V V | 8Ω, no load, Audio Mode 5, Volume 4 @ 0 dBm0 (Nominal level)
> Nominal differential output voltage (peak to peak) EPP2 to EPN2 |  | 2.8 2.9 |  | V V | 32Ω, no load Audio Mode 6, Volume 3 1 @ 0 dBm0 (Nominal level)
> Output bias voltage |  | Batt+/2 |  | V | from EPP1 or EPN1 to AGND
> Output bias voltage |  | 1.2 |  | V | from EPP2 or EPN2 to AGND
> Differential output gain settings (gs) at 6dB stages (outBbcGain) | -18 |  | 0 | dB | Set with AT^SNFO
> Fine scaling by DSP (outCalibrate) | - |  | 0 | dB | Set with AT^SNFO
> Differential output load resistance | 7.5 | 8 |  | Ω | From EPP1 to EPN1
> Differential output load resistance | 27 | 32 |  | Ω | From EPP2 to EPN2
> Single ended output load resistance | 27 | 32 |  | Ω | From EPP2 or EPN2 to AGND
> Absolute gain error | -0.1 |  | 0.1 | dB | outBbcGain=2
> Idle channel noise2 |  | -83 | -75 | dBm0p | outBbcGain=2
> Signal to noise and distortion3 | 47 |  |  | dB | outBbcGain=2
> Frequency Response4 0Hz - 100Hz 200Hz 300Hz - 3350Hz 3400Hz 4000Hz >4400Hz | -0.2 | -1.1 -0.7 -39 | -34 0.1 -75 | dB |

> 1
> Full scale of EPP2/EPN2 is lower than full scale of EPP1/EPN1 but the default gain is the same. 3.14dBm0 will lead to clipping if the default gain is used.
> 2
> The idle channel noise was measured with digital zero signal fed to decoder. This can be realized by setting outCalibrate and sideTone to 0 during a call.
> 3
> The test signal is a 1 kHz, 0 dbm0 sine wave.
> 4
> This is the frequency response from a highpass and lowpass filter combination in the DAC of the baseband chip set. If the PCM interface is used, this filter is not involved in the audio path. Audio mode 1 to 4 incorporate additional frequency response correction filters in the digital signal processing unit and are adjusted to their dedicated audio devices (see Table 35)
> gs = gain setting