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參數(shù)資料
| 型號： | SP3508EB |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 22/36頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVALUATION FOR SP3508 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 主要目的： | 接口，收發(fā)器，RS-232，RS-449，EIA-530（A），X.21 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | SP3508 |
| 主要屬性： | 內(nèi)部線路或數(shù)字回路測試 |
| 次要屬性： | 8 個(gè)驅(qū)動(dòng)器和 8 個(gè)接收器 |
| 已供物品： | 板 |
| 其它名稱： | 1016-1626 |
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Exar Corporation 48720 Kato Road, Fremont CA, 94538 (50)668-707 www.exar.com
SP3508_00_072208
V CC = +3V
+6V
V SS1 Storage C apacitor
V DD Storage C apacitor
C 1
C 2
+
–
C VDD
C VSS1
Figure 48. Charge Pump - Phase 4.
2-phased inverter pump
Phase 1
Please refer to figure below: In the first phase of the clock cycle, switches S2 and S4 are
opened and S1 and S3 closed. This connects the flying capacitor, C3, from Vin to ground.
C3 charge up to the input voltage applied at Vcc.
Phase 2
In the second phase of the clock cycle, switches S2 and S4 are closed and S and S3 are
opened. This connects the flying capacitor, C3, in parallel with the output capacitor, C
VSS2.
The Charge stored in C3 is now transferred to C
VSS2. Simultaneously, the negative side of
C
VSS2 is connected to VSS2 and the positive side is connected to ground. With the voltage
across C
VSS2 smaller than the voltage across C3, the charge flows from C3 to CVSS2 until the
voltage at the V
SS2 equals -VCC.
C 3
S 2
S 1
S 3
S 4
V SS2
C VSS2
+
VCC
VSS2 = -V CC
Figure 49. Circuit for an Ideal Voltage Inverter.
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