tpa 6040a4 overview

Information about tpa 6040a4 overview

Published on June 19, 2007

Author: Mentor

Source: authorstream.com

Content

TPA6040A42-W Stereo Class-AB Audio Power Amplifier w/ DirectPath™ Headphone Amplifier and LDO:  Great audio quality Eliminates output capacitors, cuts cost by ~$0.30 and improves low frequency response Power Supply to CODECs High CMRR for RF noise immunity Eliminates four external resistors Windows Vista™ compliant Headphone outputs are ground Referenced – DirectPath™ Integrated LDO Differential speaker inputs 4-Step internal gain 32-pin QFN TPA6040A4 2-W Stereo Class-AB Audio Power Amplifier w/ DirectPath™ Headphone Amplifier and LDO 1kU / $1.15 2W in 4 ohms TPA6041A4 – 3.3V LDO TPA6043A4 – different gain settings TPA6044A4 – no LDO Notebook Audio Solutionsby Market Segment:  TPA3007D1 TPA3005D2 TPA2010D1 TPA2005D1 TPA2012D2 TPA2008D2 20W-1W Filter-Free Class-D High output power Cool operating temperature Low power consumption Stereo/Mono speaker drive Stereo headphone drive DC Volume Control Notebook Audio Solutions by Market Segment TPA6011A4 TPA0252 2.8W Class-AB Stereo headphone drive DC volume control Digital volume control Shutdown control TPA6020A2 TPA6017A2 TPA0212/0312 TPA6211A1 TPA4411 3.1W - 1W Class-AB Stereo/Mono speaker drive Cap-Free headphone drive Shutdown control 2W Class-AB Windows Vista™ Compliant Stereo Cap-Free Headphone Integrated LDO for CODEC TPA6040A4 family Migration Path andgt; Summary & Positioning:  Summary andamp; Positioning Competes directly with Maxim’s MAX9789A TI’s fully-differential architecture provides superior noise rejection, a common problem caused by GSM or CDMA cell phones TI provides superior cross-talk performance, improving overall audio quality Superior to Anpec’s APA2056 TI reduces total system cost with integrated LDO and fewer external components TI provides lower THD+N, improving overall audio quality Competitive Spec Comparison:  Competitive Spec Comparison Slide5:  Typical RF waveform of a TDMA/GSM cellphone High-Frequency RF in 217Hz bursts Amplifier Outputs (Bandwidth limited andlt;20 MHz) Amplifier Outputs (Bandwidth limited andlt;20 MHz) Inverting Amplifier (A) Output Inverting Follower (B) Output High-frequency signal gated by a 217Hz square wave No RF Rectification due to differential feedback of audio amplifier. The BTL (Fully Differential) Amplifier The BTL (Master/Slave) Amplifier Buzzing and Clicking Noise Audio Amplifier Design Fully-Differential for Superior Noise Rejection See speaker notes for more information Slide6:  No Common-mode Noise Rejection on input Gain setting amplifier Inverting amplifier Noise on input Noise on output Noise on output 1 Noise coupled onto inputs will be amplified to the outputs RF noise coupled onto outputs will cause RF Rectification – BAD! 1 2 2 2 No feedback to input signal = NOISE on the outputs! Audio Amplifier Design Single-ended vs. Differential See speaker notes for more information Slide7:  Good CMRR Noise on input Noise on output Noise on input Noise on output Common-Mode Noise is cancelled due to differential feedback! Noise coupled onto inputs will be cancelled due to differential input stage RF noise coupled onto outputs will be cancelled due to differential feedback 1 2 1 1 2 Audio Amplifier Design Fully-Differential Eliminates Common Mode See speaker notes for more information DirectPath™ Advantage with 16-W Load:  DirectPath™ Advantage with 16-W Load VDD = 3.3V TPA6040A4 headphone Traditional HP Driver CO = 22uF Traditional HP Driver CO = 44uF Traditional HP Driver CO = 69uF Bass response very limited using traditional HP drivers – DC blocking capacitors also block bass! Amplitude vs. Frequency See speaker notes for more information Similar Performance Under No Load Condition:  Similar Performance Under No Load Condition TPA6040A4 headphone VDD = 3.3V Traditional HP Driver CO = 22uF Traditional HP Driver CO = 44uF Traditional HP Driver CO = 69uF Amplitude vs. Frequency With no load, the high-pass filter is formed with the blocking capacitor and a high-impedance probe…little effect. See speaker notes for more information

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