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YDA144-WZ View Datasheet(PDF) - Yamaha Corporation

Part Name
Description
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YDA144-WZ Datasheet PDF : 26 Pages
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YDA144
Resistor(Rex), Capacitor(Cex) and Attack Time, Release Time
Rex(M)
1
4.7
1
1
Cex(µF)
1
1
0.47
4.7
Attack Time(ms)
10
10
4.7
47
Release Time(s)
0.8
3.8
0.38
3.8
Non-Clip control function can be invalidated by the NCRC terminal assumption H level fixation (AVDD potential) or L
level fixation (GND). In that case, the following differences exist by the state of the NCRC terminal.
Difference of operation by state of NCRC terminal when Non-Clip control function is OFF.
NCRC terminal
Current increase Start up wait time
Non-Clip function ON/OFF change
[mA]
[sec]
in state of signal input.
L level (GND)
0.2 (Maximum)
0
Change is possible.
H level (AVDD potential)
0
3*Rex*Cex
Change is prohibited.
Start up wait time: It means time until the signal input is permitted from Non-Clip function ON.
Protection Function
YDA144 has the following protection functions for the digital amplifier: Over-current Protection function, Thermal
Protection function, and Low voltage Malfunction Prevention function.
Over-current Protection function
This is the function to establish the over-current protection mode when detecting a short circuit between YDA144
differential output pin and VSS, VDD, or another differential output. The function works independently for Lch and Rch. In
the over current protection mode, the differential output pin becomes a high impedance state.
Setting /SDR pin to a logic Low state can cancel the Rch over current protection mode. Likewise, when setting /SDL pin to
a logic Low level, the over current protection mode applied to Lch can be cancelled. In addition, turning on the power again
can cancel the over current protection mode applied to Lch and Rch.
Thermal Protection function
This is the function to establish the thermal protection mode when detecting excessive high temperature of YDA144 itself.
In the thermal protection mode, the differential output pin becomes Weak Low state (a state grounded through high
resistivity). And, when YDA144 gets out of such condition, the protection mode is cancelled.
Low voltage Malfunction Prevention function
This is the function to establish the low voltage protection mode when AVDD pin voltage becomes lower than the detection
voltage (VUVLL) for the low voltage malfunction prevention and to cancel the protection mode when AVDD pin voltage
becomes higher than the threshold voltage (VUVLH) for its deactivation. In the low voltage protection mode, the differential
output pin becomes Weak Low state (a state grounded through high resistivity). YDA144 will start up within the start-up
time (TSTUP) when the low voltage protection mode is cancelled.
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