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TDA8576T Dataheets PDF



Part Number TDA8576T
Manufacturers NXP
Logo NXP
Description Class-H high-output voltage level line driver
Datasheet TDA8576T DatasheetTDA8576T Datasheet (PDF)

INTEGRATED CIRCUITS DATA SHEET TDA8576T Class-H high-output voltage level line driver Product specification Supersedes data of 1997 Feb 26 File under Integrated Circuits, IC01 1998 Oct 16 Philips Semiconductors Product specification Class-H high-output voltage level line driver FEATURES • Output voltage swing larger than supply voltage • High supply voltage ripple rejection • Low distortion • Low noise • ESD protected on all pins. GENERAL DESCRIPTION The TDA8576T is a two channel class-H high.

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INTEGRATED CIRCUITS DATA SHEET TDA8576T Class-H high-output voltage level line driver Product specification Supersedes data of 1997 Feb 26 File under Integrated Circuits, IC01 1998 Oct 16 Philips Semiconductors Product specification Class-H high-output voltage level line driver FEATURES • Output voltage swing larger than supply voltage • High supply voltage ripple rejection • Low distortion • Low noise • ESD protected on all pins. GENERAL DESCRIPTION The TDA8576T is a two channel class-H high-output voltage line driver for use in car audio applications. The line driver operates as a non-inverting amplifier with a gain of 6 dB and a single-ended output. Due to the class-H voltage lifting principle the voltage swing over the load is more than the supply voltage. QUICK REFERENCE DATA SYMBOL VCC ICC Gv Vo(rms) SVRR THD Vno Zo PARAMETER supply voltage supply current voltage gain maximum output voltage (RMS value) THD = 0.1% supply voltage ripple rejection total harmonic distortion noise output voltage output impedance Vo(rms) = 3 V; f = 1 kHz VCC = 9 V CONDITIONS 6 − 5 5.0 40 − − − MIN. 9 14 6 5.3 65 0.005 5 − TYP. TDA8576T With a supply voltage of 9 V the output voltage swing over the load will be more than 14 V (peak-to-peak). The TDA8576T is available in a SO16 package. Line drivers are necessary in car audio systems in which the power amplifiers are driven by long cables. The signal-to-noise ratio of these car audio systems is improved by using the TDA8576T class-H high-output level line driver. The high-output level of TDA8576T enables a reduction of the gain of the power amplifier resulting in an improvement of the power amplifier performance. MAX. 12 20 7 − − − − 10 UNIT V mA dB V dB % µV Ω ORDERING INFORMATION TYPE NUMBER TDA8576T PACKAGE NAME SO16 DESCRIPTION plastic small outline package; 16 leads; body width 7.5 mm VERSION SOT162-1 1998 Oct 16 2 Philips Semiconductors Product specification Class-H high-output voltage level line driver BLOCK DIAGRAM TDA8576T handbook, full pagewidth VCCL 1 36 kΩ BUFFER 36 kΩ VCCL 16 15 LIFT AMP. CL+ CL− − + SVRL 3 BUFFER 20 kΩ + − REFERENCE SIGNAL AMP. 13 OUTL VCCL INL INML 2 4 14 LGND INMR INR 5 7 TDA8576T 5Ω 11 RGND REFERENCE VCCR − + 12 SIGNAL AMP. OUTR SVRR 6 BUFFER 20 kΩ 36 kΩ BUFFER 8 + − LIFT AMP. 10 9 CR− CR+ VCCR 36 kΩ VCCR MGE671 Fig.1 Block diagram. 1998 Oct 16 3 Philips Semiconductors Product specification Class-H high-output voltage level line driver PINNING SYMBOL VCCL INL SVRL INML INMR SVRR INR VCCR CR+ CR− RGND OUTR OUTL LGND CL− CL+ PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 DESCRIPTION supply voltage left channel input voltage left channel SVRR left channel inverting input left channel inverting input right channel SVRR right channel input voltage right channel supply voltage right channel lift capacitor (+) right channel lift capacitor (−) right channel ground right channel output voltage right channel output voltage left channel ground left channel lift capacitor (−) left channel lift capacitor (+) left channel handbook, halfpage TDA8576T VCCL INL SVRL INML INMR SVRR INR VCCR 1 2 3 4 16 15 14 13 CL+ CL− LGND OUTL OUTR RGND CR− CR+ TDA8576T 5 6 7 8 MGE670 12 11 10 9 Fig.2 Pin configuration. FUNCTIONAL DESCRIPTION Lift amplifier The lift amplifier, referred to as LIFT AMP. in Fig.1, is used as a non-inverting amplifier with a voltage gain of 6 dB set by an internal feedback network. If the output voltage of the signal amplifier is low, the external lift capacitor is recharged by the lift amplifier. As soon as the output voltage of the signal amplifier increases above 0.87 × VCC the lift amplifier switches the voltage of the lift capacitor in series with the supply voltage VCC. The voltage at the positive side of the lift capacitor is referred to as lifted supply voltage. Signal amplifier The signal amplifier, referred to as SIGNAL AMP. in Fig.1, is used as a non-inverting amplifier. The voltage gain Gv is set by the feedback resistors according to the formula: R2 G v = 1 + -----R1 and should be set to 6 dB. The LIFT AMP. and SIGNAL AMP. must have equal voltage gain Gv. The rail-to-rail output stage of the signal amplifier uses the lifted supply voltage to increase the output voltage swing. The DC output level is set to ≈0.87 × VCC. The maximum peak-to-peak output voltage of the signal amplifier is calculated with the formula: Vo ( p – p) Buffers The buffers prevent loading of the internal voltage divider network made by a series connection of resistors. For a good supply voltage ripple rejection this internal voltage divider network has to be decoupled by an external capacitor. Reference This circuit supplies all currents needed in the device. ( max ) ≈ 2 × ( 0.87V CC – 0.4 ) 1998 Oct 16 4 Philips Semiconductors Product specification Class-H high-output voltage level line driver LIMITING VALUES In accordance with the Maximum Rating System (IEC 134). SYMBOL VCC IORM Tamb Tstg Tj PARAM.


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