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參數資料
| 型號： | SP204 |
| 英文描述： | 5V High Speed RS-232 Transceivers with 0.1uF Capacitors(5V,帶0.1uF電容器的高速RS-232驅動器(4個驅動器)) |
| 中文描述： | 5V的高速RS - 232 0.1uF電容收發(fā)器（5V的，帶0.1uF電容器的高速的RS - 232驅動器（4個驅動器）） |
| 文件頁數： | 6/15頁 |
| 文件大?。?/td> | 363K |
| 代理商： | SP204 |
SP200/204/205/206/207/208/211/213
+5V High-Speed RS232 Transceivers
6
Copyright 2000 Sipex Corporation
attain symmetrical
±
10V power supplies.
Figure 3a
shows the waveform found on the
positive side of capcitor C
, and
Figure 3b
shows the negative side of capcitor C
. There is
a free–running oscillator that controls the four
phases of the voltage shifting. A description of
each phase follows.
Phase 1
— V
charge storage —During this phase of the
clock cycle, the positive side of capacitors C
1
and C
are initially charged to +5V. C
switched to ground and the charge in C
transferred to C
+5V, the voltage potential across capacitor C
2
is
now 10V.
+
is then
–
is
–
. Since C
+
is connected to
Phase 2
— V
transfer — Phase two of the clock con-
nects the negative terminal of C
to the V
SS
storage capacitor and the positive terminal of C
2
to ground, and transfers the generated –l0V to
C
. Simultaneously, the positive side of capaci-
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 approaches
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 can
be as low as 0.1
μ
F with a 16V breakdown
voltage rating.
The
SP200 Series
devices are made up of three
basic circuit blocks — 1) transmitter/driver, 2)
receiver and 3) the
Sipex
proprietary charge
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
Figure 2. Charge Pump — Phase 2
V
CC
= +5V
–10V
V
SS
Storage Capacitor
V
DD
Storage Capacitor
C
1
C
2
C
3
C
4
+
+
+
+
–
–
–
–
相關PDF資料 |
PDF描述 |
|---|---|
| SP207 | 5V High Speed RS-232 Transceivers with 0.1uF Capacitors(5V,帶0.1uF電容器的高速RS-232收發(fā)器(5個驅動器,3個接收器)) |
| SP207HB | Circular Connector; MIL SPEC:MIL-C-26482, Series I, Solder; Body Material:Aluminum; Series:PTB; No. of Contacts:6; Connector Shell Size:10; Connecting Termination:Solder; Circular Shell Style:Thru-Bulkhead Receptacle |
| SP207HBCA | PT 6C 6#20 PIN/SKT RECP |
| SP207HBCT | Circular Connector; MIL SPEC:MIL-C-26482, Series I, Solder; Body Material:Aluminum; Series:PTB; Number of Contacts:6; Connector Shell Size:10; Connecting Termination:Solder; Circular Shell Style:Thru-Bulkhead Receptacle |
| SP207HBEA | CONNECTOR; 71-128112-010 |
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