TSH31 datasheet(4/5 Pages) STMICROELECTRONICS

4 / 5 page

TSH31

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

-5V

+5V

10nF

Output

50W

10m F

1kW

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