TSH150IN Ver la hoja de datos (PDF) - STMicroelectronics

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TSH150IN

WIDE BANDWIDTH AND BIPOLAR INPUTS SINGLE OPERATIONAL AMPLIFIER

STMicroelectronics 

TSH150

TEST WAVEFORM

ts

0.1% of edge amplitude

90%

50%

td

t r 10%

Vin

EVALUATION CIRCUIT

+5V

10µF

50Ω

Input

10nF

1kΩ

10nF

10µF

-5V 1kΩ

50Ω

Output

CF

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 :

• Each power supply lead has to be bypassed

to ground with a 10nF ceramic capacitor very

close to the device and a 10µF 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. Be aware

on TSH150 device of the Iio error and input

noise currents with high feedback resistor val-

ues.

• Choose component sizes as small as possible

(SMD).

• 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 influ-

ence.

• One can add in parallel with feedback resistor

a few pF ceramic capacitor CF adjusted to

optimize the settling time.

4/7

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