22Vp-p can also be selected at the output there is a logic input which sets the boost converter to produce 11 or 15.6V, resulting in the. It secret is that PAM8907 has a built-in synchronous boost converter and a bridge-style output. They have advantages in these applications, not the least of which is simple and solid state construction that resists seawater better than a ribbon or cone based device would. Diodes has created a piezoelectric sounder driver that can output 31Vp-p, supplied from only 1.8 to 5.5V. Piezoelectric speakers can have extended high frequency output, and this is useful in some specialized circumstances for instance, sonar applications in which piezoelectric variants are used as both output devices (generating underwater sound) and as input devices (acting as the sensing components of underwater microphones). This is why they are generally used in applications where volume and high pitch are more important than sound quality. Additionally, their frequency response, in most cases, is inferior to that of other technologies, especially with regards to bass and midrange. There are also disadvantages: some amplifiers can oscillate when driving capacitive loads like most piezoelectrics, which results in distortion or damage to the amplifier. Piezoelectric speakers have several advantages over conventional loudspeakers: they are resistant to overloads that would normally destroy most high frequency drivers, and they can be used without a crossover due to their electrical properties. They are also used for producing ultrasound in sonar systems. Piezoelectric speakers are frequently used to generate sound in digital quartz watches and other electronic devices, and are sometimes used as tweeters in less-expensive speaker systems, such as computer speakers and portable radios. Typically they operate well in the range of 1-5 kHz and up to 100 kHz in ultrasound applications. Ĭompared to other speaker designs piezoelectric speakers are relatively easy to drive for example they can be connected directly to TTL outputs, although more complex drivers can give greater sound intensity. The prefix piezo- is Greek for 'press' or 'squeeze'. The initial mechanical motion is created by applying a voltage to a piezoelectric material, and this motion is typically converted into audible sound using diaphragms and resonators. It has a unit cost of $0.43 in 3000 piece quantities.When fixed to a metallic diaphragm and excited with an alternating voltage, the diameter of the disc varies by a small amount, this causes dishing of the diaphragm which gives a much louder sound.Ī piezoelectric speaker (also known as a piezo bender due to its mode of operation, and sometimes colloquially called a " piezo", buzzer, crystal loudspeaker or beep speaker) is a loudspeaker that uses the piezoelectric effect for generating sound. The PAM8907 piezoelectric sounder driver is supplied in the compact 10-pin U-QFN2020 package delivering a minimal footprint. The product operates across a –40 ☌ to +125 ☌ ambient temperature range. Thermal shutdown, overcurrent, and overvoltage protection, plus undervoltage lockout mechanisms, are included to ensure reliable operation. “Green” DeviceĪutomatic shutdown and wake-up functions help to further extend the PAM8907 sounder driver’s runtime when incorporated into battery-powered systems, with less than 1 μA of current drawn in shutdown mode.
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