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TSH150 Datasheet(PDF) 4 Page - STMicroelectronics

Part No. TSH150
Description  WIDE BANDWIDTH AND BIPOLAR INPUTS SINGLE OPERATIONAL AMPLIFIER
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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TSH150 Datasheet(HTML) 4 Page - STMicroelectronics

   
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Vin
50%
t d
t r
90%
t s
0.1% of e dge a mplitude
10%
TEST WAVEFORM
Input
50
1k
10nF
10
µF
C F
-5V
+5V
10nF
Output
50
10
µF
1k
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. Be aware
on TSH150 device of the Iio error and input
noise currents with high feedback resistor val-
ues.
• Choose component sizes as small aspossible
(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 feedbackresistor
a few pF ceramic capacitor CF adjusted to
optimize the settling time.
PRINTED CIRCUIT LAYOUT
TSH150
4/7


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