TS616IDW(2002) データシートの表示（PDF） - STMicroelectronics

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TS616IDW
(Rev.:2002)

DUAL WIDE BAND OPERATIONAL AMPLIFIER WITH HIGH OUTPUT CURRENT

STMicroelectronics 

TS616

contribution as low as possible against the iNp

contribution.

R1=100Ω, 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

1µF 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

+VCC

10µF

+

10nF

+

TS616

-

10nF

-VCC

10µF

+

SINGLE POWER SUPPLY

The following figure shows the case of a 5V single

power supply configuration

Figure 64: Circuit for +5V single supply

10µF

IN

Rin

+5V

1kΩ

+5V

+

½ TS616

_

R1

820Ω

Rfb

R2

820Ω

RG

+ 1µF 10nF

+ CG

100µF OUT

10Ω

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 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 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

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