TDA8594SD/N1S,112 NXP Semiconductors, TDA8594SD/N1S,112 Datasheet - Page 7

• Manufacturer Part Number: TDA8594SD/N1S,112
• Description: Audio Amplifiers GEN PURP 75W 45dB
• Manufacturer: NXP Semiconductors

Specifications of TDA8594SD/N1S,112

• Rohs: yes
• Product: General Purpose Audio Amplifiers
• Output Type: Fixed
• Output Power: 75 W
• Maximum Power Dissipation: 80 W
• Mounting Style: SMD/SMT
• Package / Case: SOT-878-1
• Common Mode Rejection Ratio (min): 45 dB
• Factory Pack Quantity: 19

NXP Semiconductors
TDA8594
Product data sheet
7.7.1 Legacy mode (pin ADSEL connected to ground)
7.7.2 I
7.7 Standby and mute operation
7.8 Start-up and shut-down sequence
The function of the STB pin is different in legacy mode and I
The function of the STB pin will change from standby/operating to standby/mute/operating
and the amplifier will start directly when the STB is put into mute or operating mode. Mute
operating is controlled via an internal timer (20 ms) to minimize mute-on pops. When the
STB pin is switched directly from operating to standby, first the fast mute will be activated
(switching to mute within 100 s) and then the amplifier will shut-down.
When the STB pin is LOW, the total quiescent current is low, and the I
be loaded.
When the STB pin is switched HIGH, the TDA8594 is put in operating condition and will
perform a Power-On Reset (POR), which results in a LOW level DIAG pin. The TDA8594
will start up when instruction bit IB1[D0] is set. Bit D0 will also reset the ‘power-on reset
occurred’ bit (DB2[D7]) and releases the DIAG pin.
The soft mute and fast mute can be activated via the I
activated independently for the front channels (channel 1 and channel 3) and rear
channels (channel 2 and channel 4), and mutes the audio in 20 ms. The fast mute
activates the mute for all channels at the same time and mutes the audio in 0.1 ms.
Releasing the mute after a fast mute will be by a soft un-mute of approximately 20 ms.
When the STB pin is switched to Standby mode and the amplifier has started, first the fast
mute will be activated and then the amplifier will shut-down. For instance, during an
engine start, it is possible to fully mute the amplifiers within 100 s by switching the STB
pin to zero.
To prevent the amplifier producing switch-on or switch-off pop noise, the capacitor on the
SVR pin is used for smooth start-up and shut-down. Increasing the value of the SVR
capacitor will mean a longer start-up and shut-down time. The amplifier output voltage is
charged to half the supply voltage minus 1.4 V in mute condition, independent of the
I
where the output will reach half the supply voltage, is used to release the mute if the
I
stay in mute when the bits were set to mute (2.6 V < V
When the amplifier is switched off by pulling the STB pin LOW, the amplifier is first muted
(fast mute) and then the capacitor on the SVR pin is discharged. With an SVR capacitor of
22 F, the standby current has reached 1 second after the STB pin is switched to zero
(see
The start-up and shut-down pop can be further decreased by activating the low pop mode.
When the low pop mode is enabled (IB2[D3] = 0), the output voltage rise from ground
level during start-up will be slower (see
but will increase the start-up time.
2
2
2
C-bus mute settings in I
C-bus bits were set to mute off (IB2[D2:D0] = 000; V
C-bus mode
Figure
3,
Figure
All information provided in this document is subject to legal disclaimers.
4,
Rev. 4 — 26 February 2013
Figure 5
2
C-bus mode or STB voltage in legacy mode. The last 1.4 V,
and
Figure
Figure
I
2
C-bus controlled 4  50 W power amplifier
6).
5). This will decrease the pop even more
2
STB
STB
C-bus. The soft mute can be
> 6.5 V in legacy mode), or will
< 4.5 V in legacy mode).
2
C-bus mode.
2
TDA8594
C-bus lines will not
© NXP B.V. 2013. All rights reserved.
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