ISD5116 Datasheet, PDF (22/57 Pages) Winbond – Single-Chip Voice Record/Playback Device Up to 16-Minute Duration with Digital Storage Capability

4 ANALOG MODE
4.1 AUX IN AND ANA IN DESCRIPTION
The AUX IN is an additional audio input to the ISD5116, such as from the microphone circuit in a mobile
phone “car kit.” This input has a nominal 700 mV p-p level at its minimum gain setting (0 dB). See the
AUX IN Amplifier Gain Settings table on page 26. Additional gain is available in 3 dB steps (controlled
by the I²C serial interface) up to 9 dB.
Internal to the device
Rb
C_COUP=0.1 µF
Ra
AUX IN
Input
NOTE: f_CUTOFF=
1
2πRaC_COUP
AUX IN
Input Amplifier
The ANA IN pin is the analog input from the telephone chip set. It can be switched (by the serial bus) to
the speaker output, the array input or to various other paths. This pin is designed to accept a nominal
1.11 Vp-p when at its minimum gain (6 dB) setting. See the ANA IN Amplifier Gain Settings table on
page 25. There is additional gain available in 3 dB steps controlled from the I²C interface, if required, up
to 15 dB.
Internal to the device
Rb
C_COUP=0.1 µF
Ra
ANA IN
Input
NOTE: f_CUTOFF=
1
2πRaC_COUP
ANA IN
Input Amplifier
October 2000
Page 21