Specifications:
Audio Module
Passive operation standard mode

Maximum input/output level: 3.5v rms
Input impedance: Fixed 100kOhm
Adjustment range: -52dB to 0dB in 127 steps
Output impedance: < 25kOhm

Audio module
Passive operation 51k shunt mode (option)

Maximum output level: 3.5V RMS (note, input level is not limited in shunt mode)
Input impedance: > 51kohm
Adjustment range: -46dB to -3dB in 127 steps
Output impedance: < 33kOhm

Audio module
Passive operation 100k shunt mode (option)

Maximum output level: 3.5V RMS (note, input level is not limited in shunt mode)
Input impedance: > 100kOhm
Adjustment range: -52dB to -6dB in 127 steps
Output impedance: < 50kOhm

Audio module
Passive operation all modes

-3dB Bandwidth: 100kHz (with no capacitive load)
THD + N: < 0.0001%
Noise: > -120dB (re. 2V)

Audio module
With LSK389 buffers fitted

-3dB Bandwidth: 100kHz (with capacitive loads up to 1nF)
THD + N: < 0.004% (2V RMS 10K load)
Noise: > -120dB (re. 2V)
Output impedance: < 50 Ohm