![]() ![]() ![]() Diodes serves the consumer electronics, computing, communications, industrial, and automotive markets. For further information, visit the Company’s website at About Diodes Incorporatedĭiodes Incorporated (Nasdaq: DIOD), a Standard and Poor's SmallCap 600 and Russell 3000 Index company, is a leading global manufacturer and supplier of high-quality application specific standard products within the broad discrete, logic and analog semiconductor markets. These comprise thermal shutdown, over-current, over-voltage and under-voltage lock-out protection. Product reliability is aided by the PAM8904’s low inrush current, low EMI drive technology and a variety of integrated protection features. In shutdown mode, quiescent current is less than 1♚. For example, active current consumption is just 300♚ in 1x mode, with an input voltage of 3V, input frequency of 4kHz and driving a 15nF piezo. The sounder driver helps to keep current consumption low and battery life long by employing built-in automatic shutdown and wake-up functions. The charge pump also enables designers to select three different piezo sound pressure levels by offering 1x, 2x and 3x operating modes. Operating from a 2.3V to 5.5V supply at a fixed frequency of 1MHz, the PAM8904 is able to drive a sounder load of up to 15nF, providing a 9V output with a minimal component footprint. With its wide input signal range of 20Hz to 300kHz and ability to deliver high volume at a low operating current, this driver is suitable for a variety of battery-powered applications, including medical systems, alarm clocks and security devices. The PAM8904 is capable of driving piezoelectric sounders up to 18V PP from a 3V power supply. 5, 2014- Diodes Incorporated (Nasdaq: DIOD), a leading global manufacturer and supplier of high-quality application specific standard products within the broad discrete, logic and analog semiconductor markets, today introduced the PAM8904 piezo-sounder driver with integrated multi-mode charge pump boost converter. These were widely used as electrical continuity testers until the advent of semiconductors, since the high-voltage transient caused by the opening contacts could, and can, easily destroy diodes and transistors.PLANO, Texas-(BUSINESS WIRE)-Jun. The third wire is used to generate feedback at the resonant frequency of the transducer, making it easy to use the transducer in a "self-driven" oscillator.īeepers comprise a family of sounders with their drivers integrated into the buzzer package, and merely need to be connected to power and perhaps to an "enable" signal to produce an audio output.Ī notable exception is the original buzzer, which was essentially a form "B" DC relay with the contacts connected between the supply and one end of the coil, with the other end of the coil being connected to the other side of the supply when a buzz was wanted. ![]() This transducer's resonant frequency is determined by the material characteristics of the coupled ceramic and metal elements and is also usually housed in an enclosure tuned to the resonant frequency of the transducer. When an alternating electrical signal is impressed across the ceramic its dimensions change and force the diaphragm to deflect back and forth normal to its surface. However, since the purpose of the device is to get attention, the housing and transducer are usually tuned for the purpose of generating a single loudness-optimized tone at a specific frequency within the range of human hearing.Ī piezo buzzer, on the other hand, comprises a piezoelectric ceramic material bonded to a thin metal diaphragm. Some buzzers comprise a miniature loudspeaker-like device to generate sound and can be driven over a range of frequencies. In general, if you're talking about modern audio signalling devices, buzzers must be externally driven, while beepers contain an internal driver and merely need a DC power source to operate. ![]()
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