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TDA8947J Fiches technique(PDF) 7 Page - NXP Semiconductors |
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TDA8947J Fiches technique(HTML) 7 Page - NXP Semiconductors |
7 / 24 page 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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