This reference design shows a quad channel: 14-bit: 250-Msps digitizer with wide input range using the LMH6881 programmable differential amplifier and ADS4449 quad-channel: 14-bit: 250-Msps ADC. This combination allows an input voltage range of approximately 1 Vpp to 100 uVpp (4 dBm to -75 dBm) while maintaining a minimum SNR of 6 dB. Performance versus input frequency is shown for both AC and DC coupled applications. Various options for common-mode voltages: power supplies: and interfaces are discussed and measured to meet the requirements of a variety of applications. Anti-aliasing filter examples are shown along with the performance improvements that they provide.
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|TIDA-00094 BOM||07 Apr 2015||305|
|TIDA-00094 Schematic and Block Diagram||07 Apr 2015||179|