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TSH350ID Datasheet(PDF) 11 Page - STMicroelectronics |
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TSH350ID Datasheet(HTML) 11 Page - STMicroelectronics |
11 / 21 page Power Supply Considerations TSH350 11/21 4 Power Supply Considerations Correct power supply bypassing is very important for optimizing performance in high-frequency ranges. Bypass capacitors should be placed as close as possible to the IC pins to improve high-frequency bypassing. A capacitor greater than 1 µF is necessary to minimize the distortion. For better quality bypassing, a capacitor of 10nF can be added using the same implementation conditions. Bypass capacitors must be incorporated for both the negative and the positive supply. Note: On the SO8_SINGLE_HF board, these capacitors are C6, C7, C8, C9. Single power supply In the event that a single supply system is used, new biasing is necessary to assume a positive output dynamic range between 0V and +VCC supply rails. Considering the values of VOH and VOL, the amplifier will provide an output dynamic from +0.9V to +4.1V on 100 Ω load. The amplifier must be biased with a mid-supply (nominally +VCC/2), in order to maintain the DC component of the signal at this value. Several options are possible to provide this bias supply, such as a virtual ground using an operational amplifier or a two-resistance divider (which is the cheapest solution). A high resistance value is required to limit the current consumption. On the other hand, the current must be high enough to bias the non-inverting input of the amplifier. If we consider this bias current (35 µA max.) as the 1% of the current through the resistance divider to keep a stable mid-supply, two resistances of 750 Ω can be used. The input provides a high pass filter with a break frequency below 10Hz which is necessary to remove the original 0 volt DC component of the input signal, and to fix it at +VCC/2. Figure 31 illustrates a 5V single power supply configuration for the SO8_S_MULTI evaluation board (see Evaluation Boards on page 10). Figure 30: Circuit for power supply bypassing + -VCC +VCC 10microF + 10nF 10microF + 10nF - + -VCC +VCC 10microF + 10nF 10microF + 10nF - |
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