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TPA2035D1YZFT Datasheet(PDF) 10 Page - Texas Instruments |
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TPA2035D1YZFT Datasheet(HTML) 10 Page - Texas Instruments |
10 / 20 page APPLICATION INFORMATION FULLY DIFFERENTIAL AMPLIFIER Advantages of Fully Differential Amplifiers SHORT CIRCUIT AUTO-RECOVERY COMPONENT SELECTION Decoupling Capacitor (CS) Input Capacitors (CI) TPA2035D1 SLOS562 – AUGUST 2008 ................................................................................................................................................................................................ www.ti.com The device 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 specifies 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 TPA2035D1 can still be used with a single-ended input; however, the TPA2035D1 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 TPA2035D1 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. When a short circuit event happens, the TPA2035D1 goes to shutdown mode and tries to reactivate itself after 20 µs. This auto-recovery will continue until the short circuit event stops. This feature can protect the device without affecting the device's long term reliability. Figure 29 shows the TPA2035D1 typical schematic with differential inputs, while Figure 30 shows the TPA2035D1 with differential inputs and input capacitors. Figure 31 shows the TPA2035D1 with a single-ended input. The TPA2035D1 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 TPA2035D1 is 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 TPA2035D1. The TPA2035D1 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 30, or if using a single-ended source, shown in Figure 31, input coupling capacitors are required. The same value capacitors should be used on both IN+ and IN– for best pop performance. 10 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): TPA2035D1 |
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