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TSH321IN Datasheet(PDF) 4 Page - STMicroelectronics |
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TSH321IN Datasheet(HTML) 4 Page - STMicroelectronics |
4 / 6 page Vin 50% t d t r 90% t s 0.1% of edge amplitude 10% TEST WAVEFORM Input 50 Ω 1k Ω 1k Ω 10nF 10 µF C F -5V +5V 10nF 10 µF 50 Ω Output EVALUATION CIRCUIT 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 : • Each power supply lead has to be bypassed to ground with a 10nF ceramic capacitor very close to the device and a 10 µF tantalum ca- pacitor. • To provide low inductance and low resistance common return, use a ground plane or com- mon point return for power and signal. • All leads must be wide and as short as possi- ble especially for op amp inputs. This is in order to decrease parasitic capacitance and inductance. • Use small resistor values to decrease time constant with parasitic capacitance. • Choose componentsizes as small aspossible (SMD). • On output, decrease capacitor load so as to avoid circuit stability being degraded which may cause oscillation. One can also add a serial resistor in order to minimise its influ- ence. • One can add in parallel with feedbackresistor a few pF ceramic capacitor CF adjusted to optimize the settling time. PRINTED CIRCUIT LAYOUT TSH321 4/6 |
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