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Datasheet: YDA131-E (YAMAHA Corp.)

2.5Wx2 Digital Audio Power Amplifier

 

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YAMAHA Corp.
High output power
2.5 W VDD=5.0V, 4 (THD+N<10%)
High efficiency operation
85 % VDD=5.0V, R
L
=8
75 % VDD=5.0V, R
L
=4
Low distortion(THD+N)
0.018 % Po=1.0W, 1kHz, R
L
=4
High signal to noise ratio
103dB VDD=5.0V, Input sensitivity =1.0V, R
L
=4
97dB VDD=5.0V, Input sensitivity=150mV, R
L
=4
Low consumption current
14.0 mA VDD=5.0V, no signal(no filter)
7.0 mA VDD=5.0V, at mute
1 A 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 (YDA131-E)
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.
YDA131CATALOG
CATALOG No.:LSI-4DA131A3
2003.1
Features
YDA131
YDA131-E
24 pin SSOP Top View
2
VPL
INL
VREFL
VSSL
VDDL
VSS
VDDR
VSSR
VREFR
INR
VPR
PROT
1
2
3
4
5
6
7
8
9
10
11
12
SLEEP
VSSPL
VDDPL
OUTML
VSSPL
OUTPL
VSSPR
OUTPR
VDDPR
OUTMR
VSSPR
MUTE
24
23
22
21
20
19
18
17
16
15
14
13
Note. A: Analog terminal
Terminal configuration
Terminal functions
I/O
-
-
-
AI
AI
-
-
O
AO
AO
I
-
-
O
O
O
O
-
-
-
-
I
AO
AO
No.
Name
Function
1
2
3
4
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
VPL
INL
VREFL
VSSL
VSS
PROT
VDDR
VSSR
VREFR
INR
VPR
MUTE
VSSPR
VDDPR
OUTMR
VSSPR
OUTPR
OUTPL
VSSPL
OUTML
VDDPL
VSSPL
SLEEP
Lch audio input
VSS for control circuit and protection circuit
Lch voltage reference
VDD for analog circuit of Rch
Rch gain control
Output shut off control
VSS for output buffer of Rch
VDD for output buffer of Rch
Negative output of Rch
VSS for output buffer of Rch
Positive output of Rch
Positive output of Lch
VSS for output buffer of Lch
Negative output of Lch
VDD for output buffer of Lch
VSS for output buffer of Lch
Operation shut off control
Lch gain control
VSS for analog circuit of Lch
Warning output for protection function
VSS for analog circuit of Rch
Rch voltage reference
Rch audio input
5
VDDL
VDD for analog circuit of Lch
YDA131
3
Balanced
Digital
Modulation
Unit
(L channel)
Balanced
Digital
Modulation
Unit
(R channel)
Pop Noise
Rejection
Over
Temperature
Detection
Over
Current
Detection
SRFF
6
6
VDDPL
VDDPR
VDDPL
VDDPR
VSSPL
VSSPL
VSSPR
VSSPR
OUTPL
OUTML
OUTPR
OUTMR
VPL
INL
VREFL
SLEEP
MUTE
PROT
VPR
INR
VREFR
1
2
3
24
13
7
12
11
10
19
21
18
16
Internal block diagram
YDA131
4
VDDPL, VSSPL, VDDPR, VSSPR (Terminal No.22, 20&23, 15, 14&17)
These are the power supply and ground terminals for the output buffers.
VDDPL and VSSPL are the power supply and ground terminals for the left channel, and VDDPR and VSSPR are
the power supply and ground terminals for the right channel.
There are two VSSPL terminals and two VSSPR terminals, both of which are to be connected with similar
impedance (length of patterns on the printed circuit board).
OUTPL, OUTML, OUTPR, OUTMR (Terminal No.19, 21, 18, 16) [Digital-OUT]
These are the output buffer terminals and output digital pulse signal that has been modulated by PWM system.
OUTPL and OUTML are the output buffer terminals for the left channel, OUTPL is the positive terminal and
OUTML is the negative terminal.
OUTPR and OUTMR are the output buffer terminals for the right channel, OUTPR is the positive terminal and
OUTMR is the negative terminal.
Since both channels are BTL (Bridge-Tied Load) output, the minus terminal is not at the ground potential.
Connect the IC with the speakers through an LC filter as shown in the "Application circuit" for the purpose of
removing the carrier frequency signal.
VDDL, VSSL, VDDR, VSSR (Terminal No.5, 4, 8, 9)
These are the power supply and ground terminals for the circuitries other than the output buffers.
VDDL and VSSL are the power supply and ground terminals for the left channel circuit.
VDDR and VSSR are the power supply and ground terminals for the right channel circuit.
VSS (Terminal No.6)
This is the ground terminal for the protection circuitry and the control circuitry.
Connect VSS to the left-channel analog ground near the terminal.
INL, VPL, INR, VPR (Terminal No.2, 1, 11, 12) [Analog]
These are the audio signal input and gain adjustment terminals.
INL and VPL are the audio signal input and gain adjustment terminals for the left channel.
INR and VPR are the audio signal input and gain adjustment terminals for the right channel.
The terminals are connected respectively to the inversion input and output of the first stage inversion operational
amplifiers. The amplifier gain is set by connecting an input resistor and a feedback resistor to both terminals as
shown the "Application circuit". The use of this inversion operational amplifier allows making a simple filter.
For the details, refer to "Gain setting" on page 6.
VREFL, VREFR (Terminal No.3, 10) [Analog]
These are reference voltage output terminals.
VREFL is the reference voltage output terminal for the left channel, and VREFR is the reference voltage output
terminal for the right channel. Connect the same capacitors to these terminals. The starting time is set by
changing the capacitance connected to VREFL and VREFR terminals.
For the details, refer to "Pop noise reduction function" on page 9.
SLEEP (Terminal No.24) [Digital-IN]
This is the operation shut off control terminal.
The terminal controls both channels at the same time. When SLEEP terminal is set at "H" level, all of the internal
circuits are placed in the shut off state, output is placed in the muted state, and the IC is placed in the sleep state.
At this time the power consumption is minimized, and warning signal (PROT terminal output) is set at "L" level.
When SLEEP terminal is set at "L" level, this IC goes into normal operation after sufficient time (starting time) to
make each reference voltage reaches a fixed potential.
Description of terminal functions
YDA131
5
MUTE (Terminal No.13) [Digital-IN]
This is the output shut-off control terminal.
The terminal controls both channels at the same time. When MUTE terminal is set at "H" level, all of the output
buffer terminals, OUTPL, OUTML, OUTPR and OUTMR output "L" level, and this IC changes in mute state.
When MUTE terminal is set at "L" level, all of the output buffer terminals, OUTPL, OUTML, OUTPR and OUTMR
output the digital pulse signal.
PROT (Terminal No.7) [Digital-OUT]
This is the warning signal output terminal for both overcurrent detection and high temperature detection.
PROT terminal outputs "H" level when either of those detection circuitries detects a hazardous state.
For the method of controlling MUTE terminal and SLEEP terminal by using PROT terminal, refer to "Overcurrent
detection function and high temperature detection function" on page 7.
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