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TSH11I Datasheet(PDF) 4 Page - STMicroelectronics |
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TSH11I Datasheet(HTML) 4 Page - STMicroelectronics |
4 / 5 page TSH11 4/5 EVALUATION CIRCUIT PRINTED CIRCUIT LAYOUT As for any high frequency device, a few rules must be observed when designing the PCB to get the best performances from this high speed op amp. From the most to the least important points : u Each power supply lead has to be by- passed to ground with a 10nF ceramic ca- pacitor very close to the device and a 10 µF tantalum capacitor. u To provide low inductance and low resist- ance common return, use a ground plane or common point return for power and sig- nal. u All leads must be wide and as short as pos- sible especially for op amp inputs. This is in order to decrease parasitic capacitance and inductance. u Use small resistor values to decrease time constant with parasitic capacitance. u Choose component sizes as small as pos- sible (SMD). u On output, decrease capacitor load so as to avoid circuit stability being degraded which may cause oscillation. You can also add a serial resistor in order to minimise its influence. u One can add in parallel with feedback re- sistor a few pF ceramic capacitor C F adjust- ed to optimize the settling time. Input 50W 1kW 10nF 10m F C F -5V +5V 10nF Output 50W 10m F 1kW |
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