TSH330 STMicroelectronics, TSH330 Datasheet - Page 11

• Manufacturer Part Number: TSH330
• Description: Low noise, very large bandwidth op-amp
• Manufacturer: STMicroelectronics

Specifications of TSH330

• Bandwidth: 1.1GHz (Gain=+2)
• Quiescent Current: 16.6 mA
• Slew Rate: 1800V/µs
• Input Noise: 1.3nV/√Hz
• Distortion: SFDR = -78dBc (10MHz, 2Vp-p)

Power Supply Considerations
4 Power Supply Considerations
Correct power supply bypassing is very important for optimizing performance in high-frequency ranges.
Bypass capacitors should be placed as close as possible to the IC pins to improve high-frequency
bypassing. A capacitor greater than 1 F is necessary to minimize the distortion. For better quality
bypassing, a capacitor of 10nF can be added using the same implementation conditions. Bypass
capacitors must be incorporated for both the negative and the positive supply.
For example, on the SO8_SINGLE_HF board, these capacitors are C6, C7, C8, C9.
Figure 31. Circuit for power supply bypassing
Single power supply
In the event that a single supply system is used, new biasing is necessary to assume a positive output
dynamic range between 0V and +V
will provide an output dynamic from +0.9V to +4.1V on 100
The amplifier must be biased with a mid-supply (nominally +V
component of the signal at this value. Several options are possible to provide this bias supply, such as a
virtual ground using an operational amplifier or a two-resistance divider (which is the cheapest solution).
A high resistance value is required to limit the current consumption. On the other hand, the current must
be high enough to bias the non-inverting input of the amplifier. If we consider this bias current (55 A
max.) as the 1% of the current through the resistance divider to keep a stable mid-supply, two resistances
of 470 can be used.
The input provides a high pass filter with a break frequency below 10Hz which is necessary to remove the
original 0 volt DC component of the input signal, and to fix it at +V
Figure 32
Evaluation Boards
illustrates a 5V single power supply configuration for the SO8_SINGLE evaluation board (see
on page 10).
CC
supply rails. Considering the values of V
+
+
-
-
+V
+V
-V
-V
CC
CC
CC
CC
+
+
10nF
10nF
10microF
10microF
+
+
10nF
10nF
10microF
10microF
load.
CC
CC
/2.
/2), in order to maintain the DC
OH
and V
OL
, the amplifier
TSH330
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