Hello. We are designing narrow-band radiomodem in 160 MHz band, receiver based on SA616 IC. There's no information about temperature drift (range from -40 0C to +85 0C) on pin8 AUDIO_OUT(combined with pin7 as a repeater) in SA616 (SSOP20 package). Supply voltage is 5V. DC component rejection (with internal op amp ) isn't good for us, because we use 4-cpfsk modulation, message can contain constant symbols resulting in constant frequency shift. After internal repeating we use amplification and filtering, temperature drift significantly reduce our dynamic range.
Summarised questions are:
1) Could you give Pin8 AUDIO_OUT(combined with pin7 as a repeater) temperature drift (range from -40 0C to +85 0C) with 5V supply?
2) Is there any replacement for SA616 IC?