TS616IDWT datasheet(22/27 Pages) STMICROELECTRONICS

22 / 27 page

TS616

22/27

contribution as low as possible against the iNp

contribution.

R1=100

Ω, R2=910Ω, R3=100Ω, Gain=10.1

Equivalent Input Noise: 3.93nV/

√Hz

Positive Input Current Noise: iNp=15pA/

√Hz

Conditions: frequency=100kHz, VCC=±2.5V

Instrumentation: Spectrum Analyzer HP3585A

(input noise of the HP3585A: 8nV/

√Hz)

POWER SUPPLY BYPASSING

Correct power supply bypassing is very important

for optimizing the 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

µF is necessary to minimize the distortion. For a

better quality bypassing a capacitor of 10nF can

be added using the same implementation condi-

tions. Bypass capacitors must be incorporated for

both the negative and the positive supply.

Figure 63: Circuit for Power Supply Bypassing

SINGLE POWER SUPPLY

The following figure shows the case of a 5V single

power supply configuration

Figure 64: Circuit for +5V single supply

The TS616 operates with power supplies from

12V down to 5V. This can be achieved by either a

dual power supplies of ±6V or ±2.5V or a single

power supply of 12V or 5V referenced to the

ground. In the case of asymmetrical supply, a 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 ampli-

fier will provide an output dynamic from +0.5V to

10.6V on 25

Ω load for a 12V supply and from

0.45V to 3.8V on 10

Ω 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 op-

tions 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

-VCC

+VCC

µF

10nF

TS616

µF

10nF

-VCC

+VCC

µF

10nF

TS616

µF

10nF

820

Ω

+5V

Ω

OUT

Rfb

10µF

+ 1µF

½ TS616

100µF

820

Ω

+5V

10nF

Rin

Ω

820

Ω

+5V

Ω

OUT

Rfb

10µF

+ 1µF

½ TS616

100µF

820

Ω

+5V

10nF

Rin

Ω

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