Overview: YDA137
D- 2
STEREO 5W DIGITAL AUDIO POWER AMPLIFIER ■Overview
YDA137 (D-2) is a high efficient digital audio power amplifier IC that operates on a single 5V power supply. With YDA137 in BTL connection, an audio power amplifier with a maximum output of 5W (RL=2Ω)×2ch can be configured with one chip. YDA137 converts an input analog data into a digital pulse by the digital modulation circuit in the IC and outputs a high current digital pulse from the output buffer circuit. This digital pulse signal is converted into an audio signal by an external low-pass filter and is output to the speaker. Low-distortion rate characteristics and high S/N ratio are realized as a digital amplifier among same class, by adopting Yamaha’s unique modulation system. In addition, class AB headphone amplifier with output of 20mW (RL=16Ω)×2ch is embedded and switching between digital amplifier output and headphone amplifier output can be done by the control of terminal termination. YDA137 has the over-current protection function for speaker terminals, the high-temperature protection function for IC, and the pop noise rejection function. IC operation can be restricted by the two control signals of /SLEEP and /MUTE. /SLEEP signal can stop all functions and decrease the consumption power to a minimum. In addition, /MUTE signal can pull-down the output buffer (hereinafter, described as WL) and make the output mute.
