Description
HA12167FB/HA12169FB is silicon monolithic bipolar IC providing REC volume system, Level meter system and Dolby noise reduction system in one chip.

Features
• Available to create characteristics of REC equalizer by changing external resistor, no coil
• Equalizer volume is available to calibrate recording automatically with micro-controller
• Electronic volume built-in is available to set the level of recording and play back automatically with micro-controller
• 4 types of input (3 out of 4 are by way of electronic volume)
• Input electronic control switching is irrelevant to REC/PB electronic control switching
• Dolby noise reduction system is available with double cassette decks (Unprocessed signal output available from recording out terminals during PB mode)
• Log-compressed level meter output is range from 0 V to 5 V (Usable as music search switchable gain of 0 dB and 20 dB respectively)
• Normal-speed/high-speed, normal/metal/chrome fully electronic control switching built-in
• NR-ON/OFF, Dolby B/C, MPX ON/OFF fully electronic control switching built-in
• Reduction of the number of pins by transfered serial data to electronic volume control switching and another control switching (Controllable from micro-controller directly)
• Small the number of external parts

Functions
• REC equalizer × 2 channel
• Equalizer volume × 2 channel
• Dolby B/C NR × 2 channel
• REC/PB input electronic volume × 2 channel
• Level Meter × 2 channel
• DAC for adjusting bias × 2 channel