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TS4994 Folha de dados(PDF) 22 Page - STMicroelectronics |
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TS4994 Folha de dados(HTML) 22 Page - STMicroelectronics |
22 / 31 page TS4994 Application Information 22/31 Figure 72. PSRR vs. frequency worst case condition The two following graphs show typical application of TS4994 with four 0.1% tolerances and a random choice for them. Figure 73. PSRR vs. frequency with random choice condition Figure 74. PSRR vs. frequency with random choice condition CMRR performance For this calculation, we consider there to be no influence of Cin and Cfeed. Cb has no influence in the calculation of the CMRR. We use the same kind of resistor (same tolerance) and ∆R is the tolerance value in %. The following equation is valid for frequencies ranging from DC to about 1kHz. Above this frequency, parasitic effects start to be significant and a literal equation is not possible to write. The CMRR equation is ( ∆R in %): Example: With ∆R=1%, the minimum CMRR would be -34dB. With a DC Vic=2.5V, the DC differential output (Voo) which results is 50mV maximum. As this Voo is across the load, for an 8 Ω load the extra consumption would be 50mV/8=6.2mA. 100 1000 10000 -140 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 Cb=0.1 µF Cb=1 µF Cb=0 20k 20 Cb=0.47 µF Vcc = 2.5V, Vripple = 200mVpp Av = 1, Cin = 4.7 µF ∆R/R = 0.1%, RL ≥ 8Ω Tamb = 25 °C, Inputs = Grounded Frequency (Hz) 100 1000 10000 -140 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 Cb=0.1 µF Cb=1 µF Cb=0 20k 20 Cb=0.47 µF Vcc = 5V, Vripple = 200mVpp Av = 1, Cin = 4.7 µF ∆R/R ≤ 0.1%, RL ≥ 8Ω Tamb = 25 °C, Inputs = Grounded Frequency (Hz) 100 1000 10000 -140 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 Cb=0.1 µF Cb=1 µF Cb=0 20k 20 Cb=0.47 µF Vcc = 2.5V, Vripple = 200mVpp Av = 1, Cin = 4.7 µF ∆R/R ≤ 0.1%, RL ≥ 8Ω Tamb = 25 °C, Inputs = Grounded Frequency (Hz) ) dB ( ) R 10000 ( 200 R Log 20 CMRR 2 ⎥ ⎦ ⎤ ⎢ ⎣ ⎡ ∆ − × ∆ × ≤ |
Nº de peça semelhante - TS4994 |
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Descrição semelhante - TS4994 |
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