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PDF YDA144 Data sheet ( Hoja de datos )

Número de pieza YDA144
Descripción STEREO 2.1W Non-Clip DIGITAL AUDIO POWER AMPLIFIER
Fabricantes YAMAHA CORPORATION 
Logotipo YAMAHA CORPORATION Logotipo



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YDA144
D- 4N
STEREO 2.1W Non-Clip DIGITAL AUDIO POWER AMPLIFIER
Overview
YDA144 (D-4N) is a digital audio power amplifier IC with maximum output of 2.1W (RL=4)×2ch.
YDA144 has a “Pure Pulse Direct Speaker Drive Circuit” which directly drives speakers while reducing distortion of
pulse output signal and reducing noise on the signal, and realizes the highest standard low distortion rate characteristics
and low noise characteristics among digital amplifier ICs for mobile use.
In addition, circuit design with fewer external parts can be made depend on the condition of use because corresponds to
filter less.
The YDA144 features Yamaha original non-clip output control function which detects output signal clip due to the over
level input signal and suppress the output signal clip automatically. Also the non-clip output control function can adapt
the output clip caused by power supply voltage down with battery. This is the difference from the traditional AGC (Auto
Gain Control) or ALC (Auto Level Control) circuit. Attack time and release time can be freely set by external resistances
or capacitances.
The independent power-down function for L channel and R channel minimizes consumption current at standby. As for
protection function, overcurrent protection function for speaker output terminal, overtemperatue protection function for
inside of the device, and low supply voltage malfunction preventing function are prepared.
Features
Maximum output
2.1 W×2ch (VDDP=VDDA=5.0V, RL=4, THD+N=10%)
0.75 W×2ch (VDDP=VDDA=3.6V, RL=8, THD+N=10%)
Distortion Rate (THD+N)
0.03 % (VDDP=VDDA=3.6V, RL=8, Po=0.4W, 1kHz)
Residual Noise
www.DataSheet4U4.0coµmVrms (VDDP=VDDA=3.6V, Av=12dB)
Efficiency
84 % (VDDP=VDDA=3.6V, RL=8, Po=600mW)
78 % (VDDP=VDDA=3.6V, RL=8, Po=100mW)
S/N Ratio
95dB (VDDP=VDDA=3.6V, Av=12dB)
Channel separation
95dB (VDDP=VDDA=3.6V, RL=8, Av=18dB, 1kHz)
Over-current Protection function
Thermal Protection function
Low voltage Malfunction Prevention function
2ch independent power-down control function
Power-down High speed Recovery function
Package
Lead-free 16-ball WLCSP (YDA144-WZ)
Lead-free 20-pin QFN (YDA144-QZ)
YDA144 CATALOG
CATALOG No.:LSI-4DA144A30
2006.11

1 page




YDA144 pdf
YDA144
Description of operating functions
Digital Amplifier Function
YDA144 has digital amplifiers with analog and digital input, PWM pulse output, Maximum output of 2.1W(RL=4)×2ch.
Distortion of PWM pulse output signal and noise of the signal is reduced by adopting “Pure Pulse Direct Speaker Drive
Circuit”
In addition, YDA144 has been designed so that high-efficiency can be maintained within an average power range (100mW
or so) that is used for mobile terminal.
First Stage Amplifier Gain Setting Function
G0 terminal can set the Gain of YDA144. When Non-Clip function is disabled, the relation between G0 terminal setting and
Gain is as follows.
Digital Amplifier Gain Setting
G0
Gain
Input Impedance(ZIN)
L 12dB
44k
H 18dB
28k
NoteH and L indicates logic High and logic Low, respectively.
Input Lch differential input signals to INL+ terminal and INL- terminal through DC-cut capacitors (CIN). For single ended
operation, input the signal to INL+ pin through the DC-cut capacitor (CIN). At this time, INL- pin must be connected to
AVSS pin through a capacitor (CREF: same value as CIN). As with Lch, connect input signals to Rch.
<Differential input>
<Single input>
In addition, positive (+) and negative (-) sides of differential input pins (INL+ and INL-, or INR+ and INR-), input pins of
www.DatathSeheuentu4Use.cdocmhannel side, should be connected to each other and connected to AVSS through a capacitor.
Use a capacitor with the same capacitance (0.1µF) as that of a DC-cut capacitor in the channel side being used.
<Input terminal processing of unused channel side>
The lower cut-off frequency (fc) can be found from DC-cut capacitor (CIN) and input impedance (ZIN) as shown below.
fc=1/(2 π ZIN CIN)
In order to reduce pop-noise, impedance in the differential input signal source is arranged. And, DC-cut capacitor (CIN)
should be 0.1µF or less.
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YDA144 arduino
YDA144
QFN20
Snubber circuit and schottky barrier diode are unnecessary (2.7VPVDD4.5V)
Snubber circuit and schottky barrier diode are necessary (4.5VPVDD)
www.DataSheet4U.com
When the IC is used at more than 4.5V power supply, use it with an additional capacitor of 10µF or over between PVDD and GND.
Place a bypass capacitor as close as possible to each power supply pin of the IC.
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