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TPA0242

Audio Power Amplifier

Evaluation Module

March 2000

Mixed-Signal Products

User’s Guide

SLOU074

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Summary of Contents for TPA0242

Page 1: ...TPA0242 Audio Power Amplifier Evaluation Module March 2000 Mixed Signal Products User s Guide SLOU074...

Page 2: ...ONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH PERSONAL INJURY OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE CRITICAL APPLICATIONS TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED AUTHORIZED OR WARRANT...

Page 3: ...s equipment is intended for use in a laboratory test environment only It generates uses and can radiate radio frequency energy and has not been tested for compliance with the limits of computing devic...

Page 4: ...iv...

Page 5: ...Inputs and Gain 3 5 3 2 3 Differential Input 3 6 3 2 4 Depop Circuitry 3 7 3 2 5 BTL Operation 3 7 3 2 6 Single Ended Operation 3 7 3 3 Using The TPA0242 EVM With the Plug N Play Evaluation Platform 3...

Page 6: ...Mute Mode and Polarity Control 3 12 3 8 Typical Headphone Plug 3 15 3 9 TPA0242 EVM Connected for Stereo BTL Output 3 16 3 10 TPA0242 EVM Connected for Stereo Single Ended Output 3 17 Tables 2 1 Typic...

Page 7: ...TPA0242 audio amplifier evaluation module SLOP275 It includes a list of EVM features a brief description of the module illustrated with a pictorial diagram and a list of EVM specifications Topic Page...

Page 8: ...th the TI plug n play audio amplifier evalu ation platform J Evaluation module is designed to simply plug into the platform automatically making all signal control and power connections J Platform pro...

Page 9: ...lay audio amplifier evaluation platform or to be wired directly into existing circuits and equipment when used stand alone The platform has room for a single TPA0242 evaluation module and is a conveni...

Page 10: ...1 4 Introduction...

Page 11: ...latform switch and jumper settings shown in Table 2 1 are typical for the TPA0242 EVM and will cause the TPA0242 to switch to single ended output mode when a plug is inserted into platform headphone j...

Page 12: ...or both may result Figure 2 1 Quick Start Platform Map Signal Conditioning CAUTION Do not insert or remove EVM boards with power applied ICC JP4 F1 VR1 R1 JP3 JP2 JP1 AC DC J2 VCC J1 D1 D2 D3 D4 J2 J3...

Page 13: ...e headphone jack J10 output will be used set headphone source switch S3 to U2 U4 Table 2 3 Platform Jumper and Switch Settings for the TPA0242 EVM JP6 JP7 JP8 S2 S3 P N P Platform Mode X Hi Note 2 U2...

Page 14: ...e module amplifier IC in the single ended output mode regardless of the control input state set jumper S3 to ON 12 To allow the module HP LINE control input to switch the amplifier IC between using th...

Page 15: ...8 9 Power supply 1 Ensure that all external power sources are set to OFF 2 Connect an external regulated power supply set to 5 V to the module VDD and GND pins taking care to observe marked polarity I...

Page 16: ...regardless of the control input state set jumper S3 to ON Control inputs 8 To allow the amplifier IC to switch from the LINE inputs to the HP inputs when the output switches from BTL output mode to SE...

Page 17: ...on information and a parts list for the TPA0242 evaluation module Topic Page 3 1 Precautions 3 2 3 2 The TPA0242 Audio Power Amplifier Evaluation Module 3 3 3 3 Using the TPA0242 EVM With the Plug N P...

Page 18: ...or both may result Figure 3 1 The TI Plug N Play Audio Amplifier Evaluation Platform Signal Conditioning CAUTION Do not insert or remove EVM boards with power applied ICC JP4 F1 VR1 R1 JP3 JP2 JP1 AC...

Page 19: ...directly into circuits or equipment The module has single in line header connector pins mounted to the under side of the board These pins allow the module to be plugged into the TI platform which auto...

Page 20: ...thermal surface mount package and has been designed to operate from low supply voltages between approximately 4 5 V and 5 5 V Typical applications include portable computers and multimedia systems Th...

Page 21: ...be AC grounded through a capacitor If using differential inputs line and headphone inputs must be the same A third input PC BEEP is common to both channels The TPA0242 IC monitors this input when oper...

Page 22: ...3 54 40 1 06 1 17 2 2 29 2 41 20 3 54 5 85 1 17 1 28 0 2 41 2 52 22 Since the overall gain of the amplifier is set by the internal preamp stage and not by the power amplifier stage the TPA0242 maintai...

Page 23: ...s in the system The platform provides such isolated output lines from the amplifier EVM sockets directly to separate left and right speaker connectors 3 2 6 Single Ended Operation For single ended ope...

Page 24: ...the proper orientation Evaluation modules are easily removed from the platform by simply prying them up and lifting them out of their sockets Care must be taken however to prevent bending the pins 3 3...

Page 25: ...5 In typical applications some or all of the jumper functions are controlled by the system microcontroller or external logic Figure 3 5 TPA0242 EVM Jumpers and Switches R4 100 k C12 10 F GND GND RLIN...

Page 26: ...the state of the SE BTL pin on the IC 3 3 2 3 S3 Input Mode Jumper To force the module amplifier IC to use the HP input regardless of the module control input state set jumper S3 to ON Jumper S3 conn...

Page 27: ...ifier in socket U5 or the signal from the TPA0242 power amplifier installed in socket U2 as determined by the setting of headphone source select switch S3 When S3 is set to the power amplifier positio...

Page 28: ...mplifier IC between the bridge tied load BTL output mode and the single ended SE output mode When the mode control input is tied to GND the module operates in the BTL output mode When this input is ti...

Page 29: ...n jumper header JP8 on the platform selects the control signal polarity by connecting either the active high or the active low line from the headphone jack to jumper JP6 When JP6 is set to Mute use th...

Page 30: ...full power output peak current draw can be as high as 1 A Any power supply connected to the platform should be capable of providing 1 A of current to avoid clipping of the output signal during peaks...

Page 31: ...right RCA phono jacks J7 and J9 left and right pairs of compression connectors for stripped speaker wires J8 and optionally through a miniature 1 8 stereo phone jack J10 for headphones The audio outpu...

Page 32: ...h current to overcome the pullup resistor on the module 100 k 3 4 1 TPA0242 EVM Connected for BTL Output Figure 3 9 TPA0242 EVM Connected for Stereo BTL Output Audio Input Right Audio Input Left Exter...

Page 33: ...ut Right Audio Input Left 5 V GND ROUT ROUT SE BTL S1 SHUTDOWN GND LOUT LOUT C11 C2 C13 VDD GND L IN GND L LINE L HP VDD GND R HP R LINE GND R IN C10 TPA00242 EVM Board SLOP275 U1 TEXAS INSTRUMENTS R2...

Page 34: ...ized 0805 1 C10 C13 Capacitor 10 F 6 3 V A 2 Panasonic ECS TOJY106R Digi Key PCS1106CT ND R1 R4 Resistor 100 k 1 8 W 5 0805 2 Panasonic ERJ 6GEYJ104V Digi Key P100KABK ND R3 Resistor 0 1 8 W 0805 1 Pa...

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