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TDA8943SF Datasheet(PDF) 5 Page - NXP Semiconductors |
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TDA8943SF Datasheet(HTML) 5 Page - NXP Semiconductors |
5 / 20 page Philips Semiconductors TDA8943SF 6 W mono Bridge Tied Load (BTL) audio amplifier Product specification Rev. 02 — 7 April 2000 5 of 20 9397 750 06865 © Philips Electronics N.V. 2000. All rights reserved. 8.2.2 Headroom Typical CD music requires at least 12 dB (factor 15.85) dynamic headroom – compared to the average power output – for transferring the loudest parts without distortion. At VCC =12V, RL =8 Ω and Po = 4 W at THD = 0.1% (see Figure 6), the Average Listening Level (ALL) – music power – without any distortion yields: Po(ALL) = 4 W/15.85 = 252 mW. The power dissipation can be derived from Figure 11 on page 10 for 0 dB respectively 12 dB headroom. For the average listening level a power dissipation of 1.8 W can be used for a heatsink calculation. 8.3 Mode selection The TDA8943SF has three functional modes, which can be selected by applying the proper DC voltage to pin MODE. See Figure 4 and 5 for the respective DC levels, which depend on the supply voltage level. The MODE pin can be driven by a 3-state logic output stage: e.g. a microcontroller with additional components for DC-level shifting. Standby — In this mode the current consumption is very low and the outputs are floating. The device is in standby mode when (VCC − 0.5 V) < VMODE <VCC, or when the MODE pin is left floating (high impedance). The power consumption of the TDA8943SF will be reduced to <0.18 mW. Mute — In this mode the amplifier is DC-biased but not operational (no audio output); the DC level of the input and output pins remain on half the supply voltage. This allows the input coupling and Supply Voltage Ripple Rejection (SVRR) capacitors to be charged to avoid pop-noise. The device is in mute mode when 3V<VMODE <(VCC − 1.5 V). Operating — In this mode the amplifier is operating normally. The operating mode is activated at VMODE < 0.5 V. 8.3.1 Switch-on and switch-off To avoid audible plops during supply voltage switch-on or switch-off, the device is set to standby mode before the supply voltage is applied (switch-on) or removed (switch-off). The switch-on and switch-off time can be influenced by an RC-circuit on the MODE pin. Rapid on/off switching of the device or the MODE pin may cause ‘click- and pop-noise’. This can be prevented by proper timing of the RC-circuit on the MODE pin. Table 4: Power rating as function of headroom Headroom Power output (THD = 0.1%) Power dissipation (P) 0 dB Po = 4 W 3.8 W 12 dB Po(ALL) = 252 mW 1.8 W |
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