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PDF YDA137 Data sheet ( Hoja de datos )
| Número de pieza | YDA137 | |
| Descripción | STEREO 5W DIGITAL AUDIO POWER AMPLIFIER | |
| Fabricantes | YAMAHA CORPORATION | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de YDA137 (archivo pdf) en la parte inferior de esta página. Total 20 Páginas | ||
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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%
www.DataS・hHeeitg4hU.Ecfofmicient 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
1 page  
YDA137
●Digital Terminals
/SLEEP (Pin No.28)
/SLEEP terminal is a sleep control terminal. It controls digital amplifiers and headphone amplifiers for both L and R
channels at the same time.
When /SLEEP terminal is L, all IC functions are stopped to enter the sleep state (hereinafter described as Sleep Mode).
When /SLEEP terminal is changed from L to H, normal operating condition is established after sufficient time (starting
time) for each reference voltage to reach the regular potential.
/MUTE (Pin No.2)
/MUTE terminal is a mute control terminal. It controls digital amplifiers and headphone amplifiers for both L and R
channels at the same time.
When /MUTE terminal is L, IC enters a mute-state. （hereinafter described as Mute Mode） In this condition, OUTPL,
OUTML, OUTPR, and OUTMR terminal become WL, and HPOL, HPOR terminal become reference level output.
(hereinafter described as RF)
When /MUTE terminal is H, it enters a normal operating condition.
/MONO (Pin No.3)
/MONO terminal is a monaural output control terminal. Digital amplifier and headphone amplifier are controlled at the
same time.
When /MONO terminal is L, it enters a monaural output state.（hereinafter described as Monaural Mode）
When /MONO terminal is H, it enters a normal operating condition.
HP (Pin No.26)
HP terminal is a headphone control terminal. Operation switching between digital amplifier and headphone amplifier is
controlled.
When HP terminal is H, it enters the headphone output mode. At this time, digital amplifier enters the Mute Mode.
When HP terminal is L, it enters the digital amplifier output mode. At this time, headphone amplifier enters the Mute
Mode.
/PROT (Pin No.27)
/PROT terminal is a warning signal output terminal for over-current and Over-Temperature Detection Function. When
failure is detected in either function, L is output. In normal operation, H is output.
www.DataSheet4U.com
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5 Page 
YDA137
●Headphone Amplifier Function
Analog
Input
CI
Rsw=
400Ω
INL/R
RI ENB
19.6kΩ
30kΩ
30kΩ
VREFL/R
VREFL/R
HPOL/R
Headphone Amplifier Circuit
When setting H to HP terminal, it enters headphone amplifier output mode. At this time, the digital amplifier enters the
Mute Mode.
Headphone amplifier section is comprised of the first stage operational amplifier and a class AB single-end output
amplifier.
In the first stage operational amplifier section, gain can be set by connecting an input resistor RI externally.
The latter stage is a high current output amplifier applicable to 16Ω load. VREF terminal voltage (vias) is applied to the
headphone amplifier output, so that connect the output to headphone through AC coupling capacitor, as shown in the
application circuit example.
Gain Setting
Gain of the first inverting amplifier can be calculated according to the following formula. In addition, class AB amplifier
gain is 0dB.
AVHP = 20×log10(19.6k / (RI + 400))
4.7kΩis selected as an input resistor RI, and total gain is set to 11.7dB.
In this setting, 150mVrms input can yield the maximum output of 20mW.
www.DataShReeelta4tUio.cnombetween an external resistor value and output level in typical input sensitivity is shown in the table below.
Input Sensitivity
External input resistor RI
External feedback resistor RFB
for digital amplifier
Digital amplifier output (RL=3Ω)
Headphone amplifier output (RL=16Ω)
150mVrms
4.7kΩ
39kΩ
3.14Vrms (3.28W or so)
0.566Vrms (20.0mW)
1.0Vrms
33kΩ
39kΩ
2.98Vrms (2.96W or so)
0.586Vrms (21.4mW)
2.0Vrms
68kΩ
43kΩ
3.19Vrms (3.38W or so)
0.573Vrms (20.5mW)
A low cutoff frequency is found by the following formula with an AC coupling capacitor (CHO) and a load resistor (RHO)
of the headphone amplifier.
fCHP = 1 ／ (2×π×CHO×RHO) ：RHO＝load resistor
Headphone Amplifier Switching Function
By making up a headphone circuit as shown in the application circuit example, two modes can be switched automatically
according to the existence of headphone.
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| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet YDA137.PDF ] | |
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