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TPA0142 Datasheet(PDF) 26 Page - Texas Instruments |
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TPA0142 Datasheet(HTML) 26 Page - Texas Instruments |
26 / 32 page www.ti.com SE/BTL OPERATION ROUT+ 21 R MUX RHPIN RLINEIN + − 23 20 8 RIN ROUT− 16 + − 1 k Ω COUTR 330 µF 100 k Ω SE/BTL 15 100 k Ω VDD 32-Step Volume Control 32-Step Volume Control TPA0142 SLOS248E – JUNE 1999 – REVISED SEPTEMBER 2004 The ability of the TPA0142 to easily switch between BTL and SE modes is one of its most important cost-saving features. This feature eliminates the requirement for an additional headphone amplifier in applications where internal stereo speakers are driven in BTL mode but external headphone or speakers must be accommodated. Two separate internal amplifiers drive OUT+ and OUT–. The SE/BTL input controls the operation of the follower amplifier that drives LOUT– and ROUT–. When SE/BTL is held low, the amplifier is on and the device is in the BTL mode. When SE/BTL is held high, the OUT– amplifiers are in a high output-impedance state, which configures the device outputs as SE drivers from LOUT+ and ROUT+. IDD is reduced by approximately one-half in SE mode. Control of the SE/BTL input can be from a logic-level CMOS source or, more typically, from a resistor-divider network as shown in Figure 38. Figure 38. TPA0142 Resistor Divider Network Circuit Using a readily-available 1/8-in. (3,5 mm) stereo headphone jack, the control switch is closed when no plug is inserted. When closed, the 100-k Ω/1-kΩ divider pulls the SE/BTL input low. When a plug is inserted, the 1-kΩ resistor is disconnected and the SE/BTL input is pulled high. When the input goes high, the OUT– amplifier is shut down, muting the speaker (virtually open-circuits the speaker). The OUT+ amplifier then drives through the output capacitor (CO) into the headphone jack. 26 |
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