TS616 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'TS616' PDF : 36 Pages View PDF
Power supply bypassing
8
Power supply bypassing
TS616
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 µF is necessary to minimize
the distortion. For better quality bypassing, a capacitor of 10 nF is added using the same
implementation conditions. Bypass capacitors must be incorporated for both the negative
and the positive supply.
Figure 63. Circuit for power supply bypassing
+VCC
10μF
+
10nF
+
TS616
-
10nF
-VCC
10μF
+
8.1
Single power supply
The TS616 can operate with power supplies ranging from 12 V to 5 V. The power supply can
either be single (12 V or 5 V referenced to ground), or dual (such as ±6 V and ±2.5 V).
In the event that a single supply system is used, new biasing is necessary to assume a
positive output dynamic range between 0 V and +VCC supply rails. Considering the values
of VOH and VOL, the amplifier will provide an output dynamic from +0.5 V to 10.6 V on 25 Ω
load for a 12 V supply and from 0.45 V to 3.8 V on 10 Ω load for a 5 V supply.
The amplifier must be biased with a mid-supply (nominally +VCC/2), in order to maintain the
DC 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 (30 µA max.) as the 1% of the current
through the resistance divider to keep a stable mid-supply, two resistances of 2.2 kΩ can be
used in the case of a 12 V power supply and two resistances of 820 Ω can be used in the
case of a 5 V power supply.
The input provides a high-pass filter with a break frequency below 10 Hz which is necessary
to remove the original 0 volt DC component of the input signal, and to fix it at +VCC/2.
Figure 64 shows a schematic of a 5 V single power supply configuration.
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