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| THS4140 Datasheet, PDF (12/24 Pages) Texas Instruments – HIGH SPEED FULLY DIFFERENTIAL I/O AMPLIFIERS | |||
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THS4140, THS4141
HIGHÄSPEED FULLY DIFFERENTIAL I/O AMPLIFIERS
SLOS320E â MAY 2000 â REVISED JANUARY 2004
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.
0.1 µF
VCC
5V
VIN
+â
VOCM
â+
â5 V
VCCâ
VDD
AVDD DVDD
AIN1
AIN2AVSS Vref
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.
0.1 µF
VCC
5V
VIN
+â
VOCM
â+
VDD
AVDD DVDD
AIN1
AIN2AVSS Vref
Figure 23. Fully Differential Amplifier Using a Single Supply
12
⢠POST OFFICE BOX 655303 DALLAS, TEXAS 75265
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