SM6451BV

SM6451BV NIPPON PRECISION CIRCUITS INC. Audio Variable Volume IC OVERVIEW The SM6451BV 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 SM6451BV devices to be connected and individually controlled over the 3-wire control interface from a single CPU. It is available in 16-pin VSOP packages. FEATURES s s PINOUT (Top View) s s s s s s Stereo inputs and outputs Attenuation function 2-channel independent control 1.0 dB/step over 80 steps 0 to −80 dB range Mute function 3-wire serial data control (MDT, MCK, MLEN) Chip addressing (up to 4 devices can be connected in parallel) Low noise 0.003 % THD + noise 12 µVrms residual noise 2.5 to 3.6 V single power supply Silicon-gate CMOS process RSTN ADRS1 ADRS2 DVDD LOUT LIN AVDD VRL 1 16 MDT MCK MLEN DVSS ROUT RIN AVSS 6451BV 8 9 VRR APPLICATIONS s Audio equipment PACKAGE DIMENSIONS (Unit: mm) 16 pin VSOP ORDERING INFORMATION D e vice SM6451BV P ackag e 16-pin V S O P 4.4 0.2 6.4 0.2 0.275TYP 5.1 0.2 0.15 - + 0.1 0.05 0 10 0.10 0.22 - 0.05 + 0.10 0.10 0.05 1.15 0.1 0.65 0.12 M 0.5 0.2 NIPPON PRECISION CIRCUITS—1 SM6451BV BLOCK DIAGRAM DVDD DVSS Attenuation Control 1/2VDD LIN LOUT MLEN MCK MDT RSTN Chip Address Decoder ADRS1 ADRS2 VR...