TS615IPWT(2004) View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
TS615IPWT Datasheet PDF : 36 Pages
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TS615
Power Supply Bypassing
8 Power Supply Bypassing
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 1µF is necessary to minimize the distortion. For a better quality
bypassing, a capacitor of 10nF 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
+
TS615
-
10nF
-VCC
10µF
+
8.1 Single power supply
The TS615 can operate with power supplies ranging from 12V to 5V. The power supply can either be
single (12V or 5V referenced to ground), or dual (such as ±6V and ±2.5V).
In the event that a single supply system is used, new biasing is necessary to assume a positive output
dynamic range between 0V and +VCC supply rails. Considering the values of VOH and VOL, the amplifier
will provide an output dynamic from +0.5V to 10.6V on 25Ω load for a 12V supply and from 0.45V to 3.8V
on 10Ω load for a 5V 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 (30µA
max.) as the 1% of the current through the resistance divider to keep a stable mid-supply, two resistances
of 2.2kΩ can be used in the case of a 12V power supply and two resistances of 820Ω can be used in the
case of a 5V power supply.
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 +VCC/2.
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