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THS4121CDGKG4 Datasheet(PDF) 11 Page - Texas Instruments |
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THS4121CDGKG4 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 30 page www.ti.com DATA CONVERTERS VIN - + - + DVDD VOCM AVSS AVDD AIN2 AIN1 3.3 V Vref 3.3 V VDD 0.1 µF VDD VIN - + - + DVDD VOCM AVSS AVDD AIN2 AIN1 Vref 3.3 V VDD 0.1 µF VCC RPU VCC RPU R(g) R(g) VP Rf Rf VOUT VOUT R PU + V P – V DD V IN – V P 1 R (g) ) VOUT – VP 1 R f (2) THS4120 THS4121 SLOS319D – FEBRUARY 2001 – REVISED OCTOBER 2004 APPLICATION INFORMATION (continued) Data converters are one of the most popular applications for the fully differential amplifiers. Fully differential amplifiers can operate with a single supply. VOCM defaults to the midrail voltage, VDD/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. Figure 19. Differential Amplifier Using a Single Supply Some single-supply applications may require the input voltage to exceed the common-mode input voltage range. In such cases, the following circuit configuration is suggested to bring the common-mode input voltage within the specifications of the amplifier. Figure 20. Circuit With Improved Common-Mode Input Voltage The following equation is used to calculate RPU: 11 Submit Documentation Feedback |
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