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AD4083BBCZ Datasheet(PDF) 28 Page - Analog Devices |
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AD4083BBCZ Datasheet(HTML) 28 Page - Analog Devices |
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28 / 94 page  Data Sheet AD4083 APPLICATIONS INFORMATION analog.com Rev. 0 | 28 of 94 ANALOG FRONT END DESIGN Driver Amplifier Choice As described in the Easy Drive Analog Inputs section, the AD4083 has a number of unique features that open this ADC up to being used with a wide range of driver amplifier solutions. Because the AD4083 offers exceptionally low noise and excellent levels of precision at sampling rates up to 40MSPS with remarkably efficient power consumption, signal chain choices on which application parameters to prioritize is presented. As is often the case, there can be some competing parameters to consider. Wider bandwidth amplifiers are required to drive faster ADCs because the settling bandwidth, signal bandwidth, and the noise bandwidth increase. In addition, as these speeds increase, maintaining precision in a driving amplifier becomes a greater challenge. These challenges are often met by increased power in the driver; however, Analog Devices, Inc., offers a wide choice of power efficient driver amplifi- ers that can be found on the Differential Amplifiers and ADC Drivers web page. Also, due to the Easy Drive features of the AD4083, where the settling bandwidth is relaxed considerably, products such as the ADA4945-1 fully differential amplifier (FDA) make an excellent low power companion product. Table 12 offers some other suggested products for consideration. Table 12. Driver Amplifier Selection Table Part Number Category Quiescent Current (IQ) Input Voltage Noise (VN) −3dB Bandwidth (Gain = 1) THD at 1MHz Application Considerations ADA4945-1 FDA 4mA 1.8nV/√Hz 145MHz −90dB Lowest power ADA4932-1 FDA 9.6mA 3.6nV/√Hz 560MHz −110dB Low power, wider bandwidth, improved distortion at higher signal frequencies ADA4927-1 FDA 20mA 1.3nV/√Hz 2300MHz −112dB Low noise, lower distortion at higher signal fre- quencies AD8139 FDA 24.5mA1 2.25nV/√Hz 410MHz −120dB Lowest distortion at higher signal frequencies ADA4899-1 Single op amp 28.6mA1 1.414nV/√Hz 600MHz −117dB Lowest distortion at higher signal frequencies ADA4930-1 FDA 35mA 1.15nV/√Hz 1350MHz −110dB Lowest noise 1 Combined quiescent current of two amplifiers. |
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