MSA180

E2D0049-39-21 www.DataSheet4U.com ¡ Semiconductor ¡ Semiconductor MSA180 Piezo Speaker Amplifier This version: Feb. 1999 MSA180 Previous version: May. 1997 GENERAL DESCRIPTION The MSA180 is a piezo speaker driver for OKI's speech synthesizers. Its voltage gain can be adjusted by a factor of up to 10. The differential output provides an amplitude of twice the voltage supply. A separate output connects to the base of an external transistor for controlling system voltage. A standby function eliminates power loss when no input signal is present. FEATURES Power supply voltage : 2.0 V to 6.0 V (single supply voltage) Low current consumption : 4.2 mA typ (VCC=3 V, no load) Standby current : <1 mA Differential output : Twice the supply voltage (maximum output amplitube) Package options : 8-pin plastic DIP (DIP8-P-300-2.54) (Product name: MSA180RS) 8-pin plastic SOP (SOP8-P-250-1.27-K) (Product name: MSA180MS-K) Chip BLOCK DIAGRAM BASE 2.2 kW VCC MODE1 MODE2 VCC VCC Logic + – + 18 kW – AV=20 SP 1.3 kW AIN AV=20 SP GND 6.6 kW 6.6 kW 1/16 ¡ Semiconductor MSA180 PIN CONFIGURATION (TOP VIEW) MODE2 1 AIN 2 GND 3 SP 4 8 MODE1 7 BASE 6 VCC 5 SP 8-Pin Plastic DIP or 8-Pin Plastic SOP PIN DESCRIPTIONS Pin 6 3 2 Symbol VCC GND AIN Type — — I Power supply pin. Ground pin. Voice signal input pin. This pin switches the device between operation and standby modes. 8 MODE1 I The IC is in operation mode if VIH > 1.0 V on the MODE1 pin and is in standby mode if VIL < 0....