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YDA137

STEREO 5W DIGITAL AUDIO POWER AMPLIFIER

Yamaha Corporation 

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.

■Features

・High Output Power

5.0 W ＠ VDD=5.0V, RL=2Ω, THD+N<10%

3.7 W ＠ VDD=5.0V, RL=3Ω, THD+N<10%

3.0 W ＠ VDD=5.0V, RL=4Ω, THD+N<10%

・High Efficient Operation

75 % ＠ VDD=5.0V, RL=2Ω, Po=5W

80 % ＠ VDD=5.0V, RL=3Ω, Po=3W

・Low Distortion Rate (THD+N)

0.03 % ＠ 1kHz, RL=2Ω, Po=2.5W

0.02 % ＠ 1kHz, RL=3Ω, Po=1.5W

・High S/N Ratio

105dB ＠VDD=5.0V, input sensitivity 1.0Vrms,

RL=2Ω, Po=5W

98dB ＠VDD=5.0V, input sensitivity 150mVrms,

RL=2Ω, Po=5W

・IC Low Consumption Current

25 mA ＠ VDD=5.0V, no signal (no filter)

10 mA ＠ VDD=5.0V, at mute

1 µA ＠ VDD=5.0V, at sleep

・CS(Channel Separation)

80dB ＠ 1kHz

・Class AB headphone amp. is embedded.

20mW ＠ VDD=5.0V, RL=16Ω, THD+N<1.0%

・Arbitral gain setting with external resistor is possible.

・Sleep function by /SLEEP terminal

・Output mute function by /MUTE terminal

・Output Over-Current Protection Function

(Ground short-circuit/Load short-circuit)

・Over-Temperature Protection Function

・Auto Resume Function from Over-Current,

High-Temperature Protection.

・Monaural Function by /MONO terminal

・Pop Noise Rejection Function at power-up or

power-cutoff.

・Analog input / BTL(Bridge-Tied Load) output

・28pin plastic TSSOP

pin lead plating with Pd-free (YDA137-AZ)

YDA137 CATALOG

CATALOG No.:LSI-4DA137A30

2005.1

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