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TDA8947J Datasheet(Fiches technique) 7 Page - NXP Semiconductors

Numéro de pièce TDA8947J
Description  4-channel audio amplifier (SE: 1 W to 25 W; BTL: 4 W to 50 W)
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Fabricant  PHILIPS [NXP Semiconductors]
Site Internet  http://www.nxp.com
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Philips Semiconductors
TDA8947J
4-channel audio amplifier
Preliminary data
Rev. 01 — 06 February 2004
7 of 24
9397 750 10779
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Mute — The amplifier is DC-biased, but not operational (no audio output). This allows
the input coupling capacitors to be charged to avoid pop-noise. The device is in the
mute mode when 4.5V<VMODE1 <(VCC − 3.5 V).
On — The amplifier is operating normally. The on mode is activated at
VMODE1 >(VCC − 2.0 V). The output of channels 3 and 4 can be set to mute or on
mode.
The output channels 3 and 4 can be switched on/off by applying a proper DC voltage
to pin MODE2, under the condition that the output channels 1 and 2 are in the on
mode (see Figure 3).
8.4 Supply voltage ripple rejection
The Supply Voltage Ripple Rejection (SVRR) is measured with an electrolytic
capacitor of 150
µF on pin SVR using a bandwidth of 20 Hz to 22 kHz. Figure 11
illustrates the SVRR as function of the frequency. A larger capacitor value on pin SVR
improves the ripple rejection behavior at the lower frequencies.
Table 5:
Mode selection
Voltage on pin
Channel 1 and 2
Channel 3 and 4
(sub woofer)
MODE1
MODE2
0 to 0.8 V
0 to VCC
standby
standby
4.5 to (VCC − 3.5 V)
0 to VCC
mute
mute
(VCC − 2.0 V) to VCC
0 to (VCC − 3.5 V)
on
mute
(VCC − 2 V) to VCC
on
on
Fig 3.
Mode selection.
MDB016
channels 3
+4: mute
channels 1
+2: on
channels 3
+4: on or mute
channels 3
+4: on
VCC−3.5
VCC
VMODE2
VCC−2.0
all standby
all mute
0.8
4.5
VCC−3.5
VCC
VMODE1
VCC−2.0




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