PMP9767
適用於 12 位元 500 MSPS ADC 的免 LDO 電源參考設計
PMP9767
概覽
The electrical performance of data converters depends on the cleanliness of their supply voltages. Linear regulators (LDOs) are commonly used but have low efficiency and high power loss, which is unsuitable for portable applications.
Using a switch mode power supply (SMPS) instead, such as the TPS62231 and TPS62237, is a cost-effective and efficient power supply solution. Such a solution does not degrade the performance of the 12-bit ADS540x family of analog to digital converters (ADCs) and does not waste excessive power. The test report shows the Signal to Noise Ratio (SNR) and Spurious-Free Dynamic Range (SFDR) comparisons between the two power supplies, which demonstrate the same performance.
特點
- Efficiency increase from 47% to 83%
- Input current reduced from 620 mA to 350 mA
- No linear regulators (LDOs) required to cleanly power ADC
- 12-bit performance maintained
- Smaller DC/DC solution size than LDOs
- Supports 5-V input
| 輸出電壓選項 | PMP9767.1 | PMP9767.2 |
|---|---|---|
| Vin (最小值) (V) | 4 | 4 |
| Vin (最大值) (V) | 6 | 6 |
| Vout (Nom) (V) | 3.3 | 1.8 |
| Iout (最大) (A) | .5 | .5 |
| 輸出功率 (W) | 1.65 | .9 |
| 隔離式/非隔離式 | Non-Isolated | Non-Isolated |
| 輸入類型 | DC | DC |
| 拓撲結構 | Buck- Synchronous | Buck- Synchronous |
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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技術文件
| 類型 | 標題 | 下載最新的英文版本 | 日期 | |||
|---|---|---|---|---|---|---|
| * | 測試報告 | PMP9767 Test Results | 2015/12/18 | |||
| 更多文件說明 | Comparing Power-Supply Architectures for a 12-bit ADC | 2017/7/25 |