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| 型號： | SP502 |
| 英文描述： | Multi-Mode Serial Transceiver |
| 中文描述： | 多模式串行收發(fā)器 |
| 文件頁數(shù)： | 9/32頁 |
| 文件大?。?/td> | 345K |
| 代理商： | SP502 |
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9
Rev. 7/21/03
SP502 Multi-Mode Serial Transceiver
Copyright 2003 Sipex Corporation
tor C
is switched to +5V and the negative side
is connected to ground.
Phase 3
— V
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
. Since C
voltage potential across C
2
is l0V.
+
is at +5V, the
Phase 4
— V
transfer — The fourth phase of the clock
connects the negative terminal of C
to ground
and transfers the generated l0V across C
to C
4
,
the V
storage capacitor. Again, simultaneously
with this, the positive side of capacitor C
is
switched to +5V and the negative side is con-
nected to ground, and the cycle begins again.
Since both V+ and V
–
are separately generated
from V
in a no–load condition, V+ and V
–
will be symmetrical. Older charge pump ap-
V
CC
= +5V
–5V
–5V
+5V
V
SS
Storage Capacitor
V
DD
Storage Capacitor
C
1
C
2
C
3
C
4
+
+
+
+
–
–
–
–
Figure 1. Charge Pump Phase 1.
V
CC
= +5V
–10V
V
SS
Storage Capacitor
V
DD
Storage Capacitor
C
1
C
2
C
3
C
4
+
+
+
+
–
–
–
–
Figure 2. Charge Pump Phase 2.
proaches that generate V
–
from V+ will show a
decrease in the magnitude of V
–
compared to
V+ due to the inherent inefficiencies in the design.
The clock rate for the charge pump typically
operates at 15kHz. The external capacitors must
be 22
μ
F with a 16V breakdown rating. Two
external Schottky diodes connected as in
Figure
6
are required for high rate of rise power sup-
plies.
External Power Supplies
For applications that do not require +5V only,
external supplies can be applied at the V+ and
V
–
pins. The value of the external supply volt-
ages must be no greater than
±
l0V. The current
drain for the
±
10V supplies is used for RS-232,
and RS-423 drivers. For the RS-232 driver the
current requirement will be 3.5mA per driver,
and for the RS-423 driver the worst case current
drain will be 11mA per driver. The external
Figure 3. Charge Pump Waveforms
+10V
GND
GND
–10V
C
2
+
C
2
–
a)
b)
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