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TPA2032D1YZFT Datasheet(PDF) 10 Page - Texas Instruments |
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TPA2032D1YZFT Datasheet(HTML) 10 Page - Texas Instruments |
10 / 19 page www.ti.com APPLICATION INFORMATION FULLY DIFFERENTIAL AMPLIFIER Advantages of Fully Differential Amplifiers COMPONENT SELECTION Decoupling Capacitor (CS) Input Capacitors (CI) fc + 1 2p R I C I (1) TPA2032D1 TPA2033D1 TPA2034D1 SLOS476 – JUNE 2006 The TPA2032D1 is a fully differential amplifier with differential inputs and outputs. The fully differential amplifier consists of a differential amplifier and a common-mode amplifier. The differential amplifier ensures that the amplifier outputs a differential voltage on the output that is equal to the differential input times the gain. The common-mode feedback ensures that the common-mode voltage at the output is biased around VDD/2 regardless of the common-mode voltage at the input. The fully differential TPA2032D1 can still be used with a single-ended input; however, the TPA2032D1 should be used with differential inputs when in a noisy environment, like a wireless handset, to ensure maximum noise rejection. • Input-coupling capacitors not required: – The fully differential amplifier allows the inputs to be biased at voltage other than mid-supply. The inputs of the TPA2032D1 can be biased anywhere within the common mode input voltage range listed in the Recommended Operating Conditions table. If the inputs are biased outside of that range, input-coupling capacitors are required. • Midsupply bypass capacitor, C(BYPASS), not required: – The fully differential amplifier does not require a bypass capacitor. Any shift in the midsupply affects both positive and negative channels equally and cancels at the differential output. • Better RF-immunity: – GSM handsets save power by turning on and shutting off the RF transmitter at a rate of 217 Hz. The transmitted signal is picked-up on input and output traces. The fully differential amplifier cancels the signal better than the typical audio amplifier. Figure 35 shows the TPA2032D1 typical schematic with differential inputs, while Figure 36 shows the TPA2032D1 with differential inputs and input capacitors. Figure 37 shows the TPA2032D1 with a single-ended input. The TPA2032D1 is a high-performance class-D audio amplifier that requires adequate power supply decoupling to ensure the efficiency is high and total harmonic distortion (THD) is low. For higher frequency transients, spikes, or digital hash on the line, a good low equivalent-series-resistance (ESR) ceramic capacitor, typically 1 µF, placed as close as possible to the device V DD lead works best. Placing this decoupling capacitor close to the TPA2032D1 is very important for the efficiency of the class-D amplifier, because any resistance or inductance in the trace between the device and the capacitor can cause a loss in efficiency. For filtering lower-frequency noise signals, a 10 µF or greater capacitor placed near the audio power amplifier would also help, but it is not required in most applications because of the high PSRR of this device. Typically, the smaller the capacitor's case size, the lower the inductance and the closer it can be placed to the TPA2032D1. The TPA2032D1 does not require input coupling capacitors if the design uses a differential source that is biased within the common-mode input voltage range. That voltage range is listed in the Recommended Operating Conditions table. If the input signal is not biased within the recommended common-mode input range, such as in needing to use the input as a high pass filter, shown in Figure 36, or if using a single-ended source, shown in Figure 37, input coupling capacitors are required. The same value capacitors should be used on both IN+ and IN– for best pop performance. The value of the input capacitor is important to consider as it directly affects the bass (low frequency) performance of the circuit. Speaker response may also be taken into consideration when setting the corner frequency using input capacitors. 10 Submit Documentation Feedback |
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