TIDA-00094
具有可變增益放大器的四通道 250-Msps 數位器參考設計
TIDA-00094
概覽
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.
特點
- Gain range of 6-dB to 26-dB allows wide input voltage range of 100 uVpp to 1 Vpp
- Allows single-ended or differential input source
- SFDR > 77 dBFs, SNR > 71 dBFS
- Examples of both AC and DC coupled interfaces
- Demonstrates anti-aliasing filter design and performance gains
- Common mode voltage considerations for best performance are discussed
已開發完全組裝的電路板，僅供測試與性能驗證，且為非賣品。
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| 類型 | 標題 | 下載最新的英文版本 | 日期 | |||
|---|---|---|---|---|---|---|
| * | 設計指南 | Quad-Channel 250-Msps Digitizer With Variable Gain Amplifier Design Guide | 2014/3/30 |