MSC1157

E2D0048-39-22 ¡ Semiconductor MSC1157 ¡ Semiconductor Speaker Drive Amplifier This version: Feb. 1999 MSC1157 Previous version: May. 1997 GENERAL DESCRIPTION The MSC1157, designed specifically to operate at a low voltage with low current consumption, is a power amplifier developed for driving a speaker for a voice IC. The voltage gains can be adjusted over a range of up to ten. The differential output can directly drive a speaker without any output coupling capacitors. The MSC 1157, because of its ability to stand by, is ideally suitable for portable equipment applications powered by a battery. FEATURES Low voltage operation Low current dissipation Operating current Standby function High output current Differential outputs : 2.0 to 6.0 V (Single power supply) : : : : 1.6mA without load (typ.) Current dissipation less than 1 mA in standby 350mA peak A speaker can be directly connected between differential outputs. : Gain can be adjusted by use of an external resistor. Adjustable gain Package options: 8-pin plastic DIP (DIP8-P-300-2.54) (Product name : MSC1157RS) 8-pin plastic SOP (SOP8-P-250-1.27-K) (Product name : MSC1157MS-K) Chip BLOCK DIAGRAM VCC Logic VCC STBY SEL VCC 52 kW + – VR SP 5 kW SP 50 kW + AIN GND – 20 kW 100 kW 5 kW 1/13 ¡ Semiconductor MSC1157 PIN CONFIGURATION (TOP VIEW) VR 1 8 SEL AIN 2 7 STBY SP 3 6 SP GND 4 8-Pin Plastic DIP or 8-Pin Plastic SOP 5 VCC PIN DESCRIPTIONS Pin 5 4 2 Symbol Type VCC GND AIN — ...