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TPA2010D1YZFT Fiches technique(PDF) 9 Page - Texas Instruments |
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TPA2010D1YZFT Fiches technique(HTML) 9 Page - Texas Instruments |
9 / 23 page www.ti.com APPLICATION INFORMATION FULLY DIFFERENTIAL AMPLIFIER Advantages of Fully DIfferential Amplifiers COMPONENT SELECTION Input Resistors (RI) Gain + 2 x 150 kW R I V V (1) TPA2010D1 SLOS417B – OCTOBER 2003 – REVISED JULY 2006 The TPA2010D1 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 TPA2010D1 can still be used with a single-ended input; however, the TPA2010D1 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. For example, if a codec has a midsupply lower than the midsupply of the TPA2010D1, the common-mode feedback circuit will adjust, and the TPA2010D1 outputs will still be biased at midsupply of the TPA2010D1. The inputs of the TPA2010D1 can be biased from 0.5 V to VDD– 0.8 V. 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. This is because 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 much better than the typical audio amplifier. Figure 27 shows the TPA2010D1 typical schematic with differential inputs and Figure 28 shows the TPA2010D1 with differential inputs and input capacitors, and Figure 29 shows the TPA2010D1 with single-ended inputs. Differential inputs should be used whenever possible because the single-ended inputs are much more susceptible to noise. Table 1. Typical Component Values REF DES VALUE EIA SIZE MANUFACTURER PART NUMBER RI 150 k Ω (±0.5%) 0402 Panasonic ERJ2RHD154V CS 1 µF (+22%, -80%) 0402 Murata GRP155F50J105Z CI(1) 3.3 nF ( ±10%) 0201 Murata GRP033B10J332K (1) CI is only needed for single-ended input or if VICM is not between 0.5 V and VDD– 0.8 V. CI = 3.3 nF (with RI = 150 kΩ) gives a high-pass corner frequency of 321 Hz. The input resistors (RI) set the gain of the amplifier according to Equation 1. Resistor matching is very important in fully differential amplifiers. The balance of the output on the reference voltage depends on matched ratios of the resistors. CMRR, PSRR, and cancellation of the second harmonic distortion diminish if resistor mismatch occurs. Therefore, it is recommended to use 1% tolerance resistors or better to keep the performance optimized. Matching is more important than overall tolerance. Resistor arrays with 1% matching can be used with a tolerance greater than 1%. Place the input resistors very close to the TPA2010D1 to limit noise injection on the high-impedance nodes. For optimal performance the gain should be set to 2 V/V or lower. Lower gain allows the TPA2010D1 to operate at its best, and keeps a high voltage at the input making the inputs less susceptible to noise. 9 Submit Documentation Feedback |
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