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YDA131 Schematic ( PDF Datasheet ) - YAMAHA CORPORATION

Teilenummer YDA131
Beschreibung STEREO 2.5W DIGITAL AUDIO POWER AMPLIFIER
Hersteller YAMAHA CORPORATION
Logo YAMAHA CORPORATION Logo 




Gesamt 18 Seiten
YDA131 Datasheet, Funktion
YDA131
D- 1
STEREO 2.5W DIGITAL AUDIO POWER AMPLIFIER
Outline
The YDA131 is the high efficient digital audio power amplifier IC that operates on a single 5V power supply.
This IC is capable of providing output power of 2.5W/channel, which is at the highest level as a device on a single 5V
power supply. By adopting Yamaha's proprietary modulation system, the device provides low distortion and high signal
to noise ratio at the highest level among digital amplifiers in the equivalent class.
This IC accepts analog signal, converts it into digital pulse by the digital modulation circuitry and outputs the signal from
the large current capacity buffers. The digital pulse signal that is outputted from the output buffer is converted into audio
signal through an external low pass filter, and sent to the speakers.
This IC has the overcurrent detection function that detects short-circuiting of speaker terminal end and the high
temperature detection function that detects abnormal high temperature.
With the overcurrent detection function, this IC generates a warning signal when the current that flows in the output
buffers of left and right channels exceeds a fixed value. With the high temperature detection function, this IC generates a
warning signal when the junction temperature becomes abnormal.
Furthermore, this IC builds in function that mute an audio output and shut off all functions of the IC. By this function,
power consumption is restrained at the minimum.
Features
High output power
2.5 W @ VDD=5.0V, 4(THD+N<10%)
High efficiency operation
85 % @ VDD=5.0V, RL=8
75 % @ VDD=5.0V, RL=4
www.DataSheeLt4oUw.cdoimstortion(THD+N)
0.018 % @ Po=1.0W, 1kHz, RL=4
High signal to noise ratio
103dB @ VDD=5.0V, Input sensitivity =1.0V, RL=4
97dB @ VDD=5.0V, Input sensitivity=150mV, RL=4
Low consumption current
14.0 mA @ VDD=5.0V, no signal(no filter)
7.0 mA @ VDD=5.0V, at mute
1 µA
@ VDD=5.0V, at sleep
Channel separation
80dB @ 1kHz
Any gain setting by external resistor
Any setting of starting time by VREF capacitor
Sleep function by SLEEP terminal
Output mute function by MUTE terminal
Over current detection function of speaker terminal end (Ground short-circuiting, Load short-circuiting)
High temperature detection function
Pop noise suppression function at turn-on and turn-off
Analog input/BTL(Bridge-Tied Load)output
24-pin plastic SSOP
Pin lead plating with Pd free (YDA13-EZ)
YDA131 CATALOG
CATALOG No.:LSI-4DA131A40
2004.12






YDA131 Datasheet, Funktion
YDA131
Description of operation functions
Refer to "Connection circuit example" on page 11, when reading the following descriptions.
Gain setting
This IC consists of the first stage inversion operational amplifier, and the fixed-gain digital power amplifier.
The gain of the digital power amplifier is fixed at 8 dB.
The gain of the first stage inversion operational amplifier is set with the resistance values of the input resistor (RI) and
feedback resistor (RF) as described by "Formula 1". To reduce pop noise, it is necessary to observe the restrictions
described in "Pop noise reduction function" on page 9. Use the feedback resistor (RF) of 10kor higher, because the
driving capability of the operational amplifier is limited.
In "Application circuit", input resistor (RI)=7.5kand feedback resistor (RF)=47kand the gain of the first stage inversion
operational amplifier is set at 16 dB, as described in "Figure 1: First stage inversion operational amplifier input circuit
example". Therefore, the total gain at this case is given as described below.
8dB (fixed gain of the digital power amplifier) + 16dB (gain of the first stage inversion operational amplifier) = 24dB
In the "Application circuit", low pass filter capacitor (CF) is added to limit the band width of the input signal, as described
in "Figure 1: First stage inversion operational amplifier input circuit example", whereby the value can be adjusted as
necessary. To limit the input DC current, DC cutting capacitor (CI) is added, whereby this capacitor and input resistor (RI)
constitute a high pass filter.
The cut off frequency fc of this high pass filter is set as necessary, and can be decided by "Formula 2".
www.DaFtaoSrhmeeutl4aU1.c:oGmain of first stage inversion operational amplifier Av(dB) = 20*log(RF/RI)
Formula 2:Cut off frequency fc(Hz) = 1/(2*π*RI*CI)
When low band boost function is needed due to a reason such as small diameter speaker, the low boost function can be
realized by making the circuit of the first stage operational amplifier as shown in "Figure 2: Low band boost circuit
example". For this circuit, the gain is increased by +3dB at the frequency fb of "Formula 3", and the low band boost
quantity Ab is decided by "Formula 4". At this time, the frequency characteristic is as shown in "Figure 3: Frequency
characteristic at low band boost".
Formula 3: Frequency at which the gain increased by +3dB fb(Hz) = 1/(2*π*RF*CB)
Formula 4: Boost quantity Ab(dB) = 20*log((RF+RB)/RF)
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YDA131 pdf, datenblatt
Application notes
YDA131
Warning for the device which makes sound using speaker.
A speaker radiates heat in a voice-coil by air flow accompanying vibration of a diaphragm. When DC signal
(several Hz or less) is input, heat radiation characteristics falls rapidly.
In addition, even if it is used lower than rated input, it may lead to voice-coil burnout, smoke or ignition of a speaker.
In order to avoid such situations, be sure to implement one or more preventive measures from the following.
1) Do not select settings (sound creation, sound generation stop with DC offset) which may generate DC signal.
(Since thoroughness of this preventive measure is generally difficult, we recommend the combined use with
the following 2, 3 and 4)
2) Add the equivalent of DC cut digital filter for cutting DC signal in the digital section.
(As long as "Built-in" is not mentioned in the manual, there is no such built-in circuit inside of a device).
3) Add a DC cut capacitor for cutting DC signal in the analog section.
(When addition is specified in the example of a recommended circuit diagram, be sure to add)
4) When a latter stage device exists in the signal path from this device to speaker, be sure to realize the DC cut in a latter
stage device.
In addition, the above-mentioned measures are based on the assumption that the device itself, DC cut capacitor, and the
latter stage device will be in a normal operation. Therefore, it is also necessary to implement measures based on the
assumption of these part failures.
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