The SM6451A/B is a 3-wire serial-controlled electronic variable volume IC for audio applications. It provides electronic volume control for a stereo system (left and right channels), and independent channel attenuation and muting, with greatly enhanced digital zip noise suppression. The chip address function allows up to four SM6451A/B devices to be connected and individually controlled over the 3-wire control interface from a single CPU.
Key Features
Stereo inputs and outputs
Attenuation/volume control
2-channel independent control
1 dB/step over 80 steps
Mute function
3-wire serial data control (MDT, MCK, MLEN)
Chip addressing (up to 4 devices can be connected in parallel)
Supply voltage range
SM6451AT: 4.5V to 5.5V
SM6451BT: 2.5V to 3.6V
Package: TSSOP-16-050044-2
Better sound playback at low audio levels
No degradation of digital audio resolution at low volume levels
SM6451 App Note.pdf