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AD4080BBCZ Datasheet(PDF) 28 Page - Analog Devices |
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AD4080BBCZ Datasheet(HTML) 28 Page - Analog Devices |
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28 / 95 page  Data Sheet AD4080 APPLICATIONS INFORMATION analog.com Rev. 0 | 28 of 95 ANALOG FRONT END DESIGN Driver Amplifier Choice As described in the Easy Drive Analog Inputs section, theAD4080 has a number of unique features that opens this ADC up to being used with a wide range of driver amplifier solutions. Because the AD4080 offers exceptionally low noise, and excellent levels of precision at sampling rates up to 40 MSPS with remarkably efficient power consumption, this presents signal chain choices on which application parameters to prioritize. 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 and signal bandwidth increase, so too does the noise bandwidth. In addition, as these speeds increase, maintaining pre- cision 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 amplifiers that can be found on the Differential Amplifiers and ADC Drivers web page. Also, due to the Easy Drive features of the AD4080, 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) −3 dB Bandwidth (Gain = 1) THD at 1 MHz Application Considerations ADA4945-1 FDA 4 mA 1.8 nV/√Hz 145 MHz −90 dB Lowest power ADA4932-1 FDA 9.6 mA 3.6 nV/√Hz 560 MHz −110 dB Low power, wider bandwidth, improved distortion at higher signal frequencies ADA4927-1 FDA 20 mA 1.3 nV/√Hz 2300 MHz −112 dB Low noise, lower distortion at higher signal fre- quencies AD8139 Single op amp 24.5 mA1 2.25 nV/√Hz 410 MHz −120 dB Lowest distortion at higher signal frequencies ADA4899-1 Single op amp 28.6 mA1 1.414 nV/√Hz 600 MHz −117 dB Lowest distortion at higher signal frequencies ADA4930-1 FDA 35 mA 1.15 nV/√Hz 1350 MHz −110 dB Lowest noise 1 Combined quiescent current of two amplifiers. |
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