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0.png (157.16 KB, 下載次數(shù): 135)
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2016-6-15 20:22 上傳
電路使用超低功耗、18位1 MSPS ADC AD7982 ，由低功耗全差分放大器ADA4940-1來驅(qū)動。低噪聲精密5.0V基準(zhǔn)電壓源 ADR395用于提供該ADC所需的5V電源。圖1所示的所有IC均采用3 mm × 3 mm LFCSP或3 mm × 5 mm MSOP小型封裝，從而有助于降低電路板成本和空間。
電路中ADA4940-1的功耗不到9 mW。18位1 MSPS AD7982 ADC的功耗僅7 mW （1 MSPS時），遠(yuǎn)低于市面上的同類ADC。此功耗也隨吞吐量而變化。ADR395功耗僅為0.7mW，使系統(tǒng)總功耗低于17 mW。
電路原理圖：
0.png (43.04 KB, 下載次數(shù): 134)
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2016-6-15 20:24 上傳
0.png (45.53 KB, 下載次數(shù): 121)
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2016-6-15 20:24 上傳
BOM表：
| Part Type | Value | Ref. Desig | FootPrint | Type | ADI # | Vendor | Vendor # | Qty. |
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| | CAP CHIP | 10 pF 100v SMT | C34, C35 | 0805 | NPO | 4-8-48 | Digi-Key | 478-1278-1-ND | 2 |
| 100 pF 50v SMT | C38 | 0805 | NPO | 4-8-2 | Digi-Key | 478-1316-1-ND | 1 |
| 2700 pF 50v SMT | C39, C40 | 1206 | NPO | 4-5-150 | Digi-Key | 478-1497-1-ND | 2 |
| .1uF 50v SMT | C7, C10-C12, | 0603 | X7R | 4-12-32 | Digi-Key | 445-1314-1-ND | 13 |
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| C15-C18, C48, C51, |
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| C54-C56 |
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| .1uF 25v SMT | C3, C5, C20, C22, | 0805 | X7R | 4-5-43 | Digi-Key | 490-1673-1-ND | 17 |
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| C25, C27-C30, C31, |
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| C37, C42, C52, |
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| C53, C63, C69, C70 |
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| 1uF 16v SMT | C6, C9, C33, C49, | 0805 | Y5V | 4-8-23 | Digi-Key | 490-1739-1-ND | 7 |
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| C57, C58, C72 |
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| 10uF 16v SMT | C32 | 0805 | X5R | 4-8-60 | Digi-Key | 490-3886-1-ND | 1 |
| 10uF 20v SMT | C8, C13, C14, | 2312 | TANT | N/A | Digi-Key | 399-3733-6-ND | 6 |
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| C21, C23, C24 |
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| | RES CHIP | 0 ohm Cer. SMT | R5, R38, R39, R53, | 0805 | 5% | 3-27-22 | Digi-Key | P0.0ACT-ND | 8 |
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| R54, R61, R64, R75 |
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| 49.9 ohm Cer. SMT | R36 | 0603 | 1% | 3-32-8 | Digi-Key | P49.9HCT-ND | 1 |
| 49.9 ohm Cer. SMT | R3, R30, R31, | 0805 | 1% | 3-19-1 | Digi-Key | P49.9CCT-ND | 5 |
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| R34, R42 |
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| 590 ohm Cer. SMT | R7, R10, | 0805 | 1% | 3-27-179 | Digi-Key | P590CCT-ND | 4 |
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| R11, R29, R60 |
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| 1K ohm Cer. SMT | R12, R62 | 0603 | 1% | 3-32-13 | Digi-Key | P1.00KHCT-ND | 2 |
| 1K ohm Cer. SMT | R23, R58 | 0805 | 1% | 3-19-8 | Digi-Key | P1.00KCCT-ND | 2 |
| 10K ohm Cer. SMT | R8, R13-R15, R24 | 0603 | 1% | 3-32-6 | Digi-Key | P10.0KHCT-ND | 12 |
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| R26-R28, R32, R33, |
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| R40, R41 |
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| 10K ohm Cer. SMT | R4, R17, R19, | 0805 | 1% | 3-18-83 | Digi-Key | P10.0KCCT-ND | 5 |
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| R21, R37 |
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| 47K ohm Cer. SMT | R22 | 0805 | 1% | 3-27-169 | Digi-Key | 311-47.0KCRCT-ND | 1 |
| 60.4K ohm Cer. SMT | R56 | 0805 | 1% | 3-27-109 | Digi-Key | P60.4KCCT-ND | 1 |
| 95.3K ohm Cer. SMT | R76 | 0805 | 1% | N/A | Digi-Key | 311-95.3KCRCT-ND | 1 |
| 127K ohm Cer. SMT | R77 | 0805 | 1% | 3-27-202 | Digi-Key | P127KCCT-ND | 1 |
| 294K ohm Cer. SMT | R55 | 0805 | 1% | N/A | Digi-Key | P294KCCT-ND | 1 |
全部資料（壓縮包）下載：
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