1 sonitron Application note March 2012 Excellence in physical acoustics sonitron piezoelectric multi–application transducers “SMAT series”, in combination with the piezo driver “MAS6240” of Micro Analog Systems MAS 6240 Excellence in physical acoustics Piezo driver that can drive outputs up to 18Vpp from 3V supply. SMAT series The Sonitron Multi-Application Transducers are low cost commercial grade piezo components for large volume applications. Easy and low-cost solution for piezo driver, since only 4 small value capacitors are needed in addition to the sound element- the use of inductors can be avoided. They are available in five sizes: 13mm, 17mm, 21mm, 24mm and 30mm. Thin 0.75mm QFN 12 Package. ADVANTAGES & APPLICATIONS ADVANTAGES & APPLICATIONS ADVANTAGES : APPLICATIONS : Piezo Driver & Charge Pump Thin 0.75 mm QFN 12 Package Three-Step Volume Adjusting Both Single Ended and Differential output Up to 18Vpp Output from 3V supply One Wire Audio & Shutdown Control Low External Part Count Solution without inductor 1MHz Switching Frequency Multi-Mode Charge Pump (1x/2x/3x) Wrist Watches Alarm Clocks Handheld GPS devices PDAs ADVANTAGES : · · · · Octagonal form Models with different pin pitches Light but solid construction Not fixed working frequency Easily mountable · SMAT-13 and SMAT-17 for limited space applications · SMD models with heat resistant labels for protection during re-flow soldering · Automatic pick & place APPLICATIONS : · · · · · · · · Alarms Gas & metal detectors Measuring & weighing equipment Medical instrumentation Timers & clocks Instrumentation & control systems Copiers Automobiles & trucks SPECIFICATIONS SMAT-13 SMAT-17 SMAT-21 SMAT-24 SMAT-30 Parameter Supply Voltage Symbol Conditions Min. Max. VIN Charge pump in 2x or 3x mode. -0.3 4.0 MAS6240 Datasheet Piezoelectric Buzzer Technology SMAT series Datasheet sonitron Techpaper R R 2 sonitron Application note March 2012 Excellence in physical acoustics Test setup *Demonstration board of the MAS6240 : - EN1/EN2 => 3X mode - Buz/single => EXT DIF - DIN select => EXT DIN *Voltage Source (PS613 Velleman) VDD=3.5Vdc *Input signal: (EXT DIN) - Frequency square wave generator (HAMEG HM8030 -5), Sweep function from 600 Hz to 10kHz in 15seconds - Square wave with 3Vpp SMAT-21 120 110 Sound Pressure Level (SPL) Graphs 90 80 dB SPL(A) SPL measurements done in the R&D anechoic laboratory room of Sonitron. 100 70 60 50 40 - Distance microphone = 30cm - SPL A -weighting curve - SMAT Transducers receiving, 20Vpp square wave from MAS6240 output. 30 20 10 0 1k 2k 3k 4k 5k 6k 7k 8k 9k 10k 5k 6k 7k 8k 9k 10k 5k 6k 7k 8k 9k 10k Frequency (Hz) SMAT-24 120 120 110 110 100 100 90 90 80 80 dB SPL(A) dB SPL(A) SMAT-13 70 60 70 60 50 50 40 40 30 30 20 20 10 10 0 0 1k 2k 3k 4k 5k 6k 7k 8k 9k 10k 1k 2k Frequency (Hz) 4k SMAT-30 SMAT-17 120 120 110 110 100 100 90 90 80 80 dB SPL(A) dB SPL(A) 3k Frequency (Hz) 70 60 70 60 50 50 40 40 30 30 20 20 10 10 0 0 1k 2k 3k 4k Frequency (Hz) Piezoelectric Buzzer Technology 5k 6k 7k 8k 9k 10k 1k 2k 3k 4k Frequency (Hz) sonitron Techpaper R R