THS4140CD datasheet(12/24 Pages) TI

12 / 24 page

THS4140, THS4141

HIGHSPEED FULLY DIFFERENTIAL I/O AMPLIFIERS

SLOS320E − MAY 2000 − REVISED JANUARY 2004

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

APPLICATION INFORMATION

data converters

Data converters are one of the most popular applications for the fully differential amplifiers. The following

schematic shows a typical configuration of a fully differential amplifier attached to a differential ADC.

VIN

−

DVDD

VOCM

AVSS

AVDD

AIN2

AIN1

VDD

Vref

5 V

VCC

0.1

µF

−5 V

VCC−

Figure 22. Fully Differential Amplifier Attached to a Differential ADC

Fully differential amplifiers can operate with a single supply. VOCM defaults to the midrail voltage, VCC/2. The

differential output may be fed into a data converter. This method eliminates the use of a transformer in the circuit.

If the ADC has a reference voltage output (Vref), then it is recommended to connect it directly to the VOCM of

the amplifier using a bypass capacitor for stability. For proper operation, the input common-mode voltage to the

input terminal of the amplifier should not exceed the common-mode input voltage range.

VIN

−

DVDD

VOCM

AVSS

AVDD

AIN2

AIN1

VDD

Vref

5 V

VCC

0.1

µF

Figure 23. Fully Differential Amplifier Using a Single Supply

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