> 5.7.5 | Voiceband Transmit Path

> Test conditions:

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

> • | Parameter setup: Audio mode=5 for MICP1 to MICN1 and 6 for MICP2 to MICN2, inBbcGain=0, inCalibrate=32767, outBbcGain=0, OutCalibrate=16384, sideTone=0

> Table 37: | Voiceband transmit path

> Parameter | Min | Typ | Max | Unit | Test condition / Remark
> Full scale input voltage (peak to peak) for 3.14dBm0 MICP1 to MICN1 or AGND, MICP2 to MICN2 or AGND |  | 1.6 |  | V | MICPx must be biased with 1.25V (VMIC/2)
> Nominal input voltage (peak to peak) for 0dBm0 MICP1 to MICN1 or AGND, MICP2 to MICN2 or AGND |  | 1.1 |  | V | MICPx must be biased with 1.25V (VMIC/2)
> Input amplifier gain in 6dB steps (inBbcGain) | 0 |  | 42 | dB | Set with AT^SNFI
> Fine scaling by DSP (inCalibrate) | - |  | 0 | dB | Set with AT^SNFI
> Microphone supply voltage VMIC | 2.4 | 2.5 | 2.6 | V |
> VMIC current |  |  | 2 | mA |
> Idle channel noise |  | -82 | -76 | dBm0p |
> Signal to noise and distortion | 70 | 77 |  | dB |
> Frequency response1 0Hz - 100Hz 200Hz 300Hz - 3350Hz 3400Hz 4000Hz >4400Hz | -0.2 | -1.1 -0.7 -39 | -34 0.1 -75 | dB |

> 1
> 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).