参数资料
| 型号： | SP504MCM-L |
| 厂商： | Exar Corporation |
| 文件页数： | 7/32页 |
| 文件大小： | 0K |
| 描述： | IC TXRX WAN MULTI-MODE 80LQFP |
| 标准包装： | 84 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 7/7 |
| 规程： | 多协议 |
| 电源电压： | 5V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 80-LQFP |
| 供应商设备封装： | 80-LQFP（14x14） |
| 包装： | 托盘 |
| 其它名称： | 1016-1682 SP504MCM-L-ND |
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Exar Corporation 48720 Kato Road, Fremont CA, 94538 50-668-707 www.exar.com
SP504_02_2708
5
Exar Corporation 48720 Kato Road, Fremont CA, 94538 50-668-707 www.exar.com
SP504_02_2708
Exar Corporation 48720 Kato Road, Fremont CA, 94538 50-668-707 www.exar.com
SP504_02_2708
VCC = +5V
–10V
VDD Storage Capacitor
C1
C2
C4
+
–
VSS Storage Capacitor
C3
+
–
VCC = +5V
VDD Storage Capacitor
C1
C2
C4
+
–
VSS Storage Capacitor
C3
+
–
–5V
VCC = +5V
–5V
+5V
VDD Storage Capacitor
C1
C2
C4
+
–
VSS Storage Capacitor
C3
+
–
VCC = +5V
+10V
VDD Storage Capacitor
C1
C2
C4
+
–
VSS Storage Capacitor
C3
+
–
Figure 5a. Charge Pump Phase 2 for ±0V.
Figure 5b. Charge Pump Phase 2 for ±5V.
Figure 6. Charge Pump Phase 3.
Figure 7. Charge Pump Phase 4.
Phase 2 (±10V)
— V
SS transfer — Phase two of the clock
connects the negative terminal of C
2 to
the V
SS storage capacitor and the positive
terminal of C
2 to ground, and transfers the
generated –l0V or the generated –5V to C
3.
Simultaneously,thepositivesideofcapacitor
C
is switched to +5V and the negative side
is connected to ground.
Phase 2 (±5V)
— V
SS & VDD charge storage — C
+
is recon-
nected to V
CC to recharge the C capacitor.
C
2
+
isswitchedtogroundandC
2
–
isconnected
to C
3. The 5V charge from Phase is now
transferred to the V
SS storage capacitor. VSS
receives a continuous charge from either C
or C
2. With the C capacitor charged to 5V,
the cycle begins again.
Phase 3
— V
DD charge storage — The third phase
of the clock is identical to the first phase
— the charge transferred in C
produces
–5V in the negative terminal of C
, which
is applied to the negative side of capacitor
C
2. Since C2
+
is at +5V, the voltage potential
across C
2 is l0V. For the 5V output, C2
+
is
connected to ground so that the potential
on C
2 is only +5V.
Figure 8a and 8b. Charge Pump Waveforms
GND
–0V
+0V
C
2
+
C
2
–
(a)
(b)
GND
C
2
+
+5V
GND
C
2
–
–5V
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