參數(shù)資料
型號(hào)： SP208EHCP
英文描述： High Speed 5V High Performance RS232 Transceivers
中文描述： 高速5V的高性能RS232收發(fā)器
文件頁(yè)數(shù)： 6/15頁(yè)
文件大?。?/td> 213K
代理商： SP208EHCP
REV: A DATE:12/03/2003
+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
+
+
+
+
–
–
–
–
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SP208EHCT 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:High Speed +5V High Performance RS232 Transceivers
SP208EHCT-L 功能描述:RS-232接口集成電路 460KBPS 5V 4DRV/4RCV RS-232 0-70C RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝:
SP208EHCT-L/TR 功能描述:RS-232接口集成電路 460KBPS 5V 4DRV/4RCV RS-232 0-70C RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝:
SP208EHEA 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:High Speed +5V High Performance RS232 Transceivers
SP208EHEA-L 功能描述:RS-232接口集成電路 460KBPS 5V 4DRV/4RCV RS-232 -40-85C RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝:
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