TS616IDWT datasheet(26/37 Pages) STMICROELECTRONICS

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Power supply bypassing

TS616

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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 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

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 k

Ω 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.

-VCC

+VCC

μF

10nF

TS616

μF

10nF

-VCC

+VCC

μF

10nF

TS616

μF

10nF

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