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參數(shù)資料
| 型號： | SP782CP |
| 英文描述： | Programmable Charge Pump |
| 中文描述： | 可編程電荷泵 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 224K |
| 代理商： | SP782CP |
11
SP782/SP784 DS/08
SP782/784 Programmable Charge Pump
Copyright 2000 Sipex Corporation
SHUTDOWN MODE
The internal oscillator of the
SP782
and
SP784
can be shutdown through the SD pin. In this
state, the V
and V
outputs are inactive and
the power supply current reduces to 10
μ
A.
LATCH ENABLE PIN
The
SP782
and
SP784
includes a control pin
(LAT) that latches the D0 and D1 control lines.
Connecting this pin to a logic HIGH state will
allow transparent operation of the D0 and D1
control lines. This input can be left floating
since there is an internal pull-up resistor which
will allow the latch to be transparent.
APPLICATIONS INFORMATION
The
SP782
and
SP784
can be used in various
applications where
±
10V is needed from a +5V
source. Analog switches, op-amp power sup-
plies, and LCD biasing are some applications
where the charge pumps can be used.
The charge pump can also be used for supplying
voltage rails for RS-232 drivers needing
±
12V.
The
±
10V output from the charge pump is more
than adequate to provide the proper V
OH
and
V
OL
levels at the driver output.
Figure 8 shows how the
SP784
can be used
in conjunction with the SP524 multiprotocol
transceiver IC. The programmability is ideal for
RS-232 and RS-423 levels. The RS-232 driver
output voltage swing ranges from
±
5V to
±
15V.
In order to meet this requirement, the charge
pump must generate
±
10V to the transceiver IC.
The RS-423 driver output voltage range is
±
4.0V to
±
6.0V. When the SP524 transceiver is
programmed to RS-423 mode (V.10), the charge
pump now provides
±
5V, through D0 and D1,
thus allowing the driver outputs to comply with
V
≤
6.0V as well as the V
requirement of
±
4.0V minimum with a 450
load to ground.
In older configurations, separate DC sources
needed to be configured or regulated down from
±
10V to
±
5V in a given application. A typical
charge pump providing V
and V
would
require external clamping such as 5V Zener
diodes. RS-423 (V.10) is usually found in
RS-449, EIA-530, EIA-530A, and V.36 modes.
When the control lines D0 and D1 are both at a
logic HIGH, V
= +5V and V
= -5V. All
other inputs to the control lines result in V
=
+10V and V
= -10V. Control of the
SP784
in
an application with
Sipex's SP524
can be found
in
Figure 8
.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SP782CT | Programmable Charge Pump |
| SP784 | Programmable Charge Pump |
| SP784CP | Programmable Charge Pump |
| SP784CT | Programmable Charge Pump |
| SP78L12N1-L | 100mA 3-Terminal Positive Voltage Regulator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP782CT | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Programmable Charge Pump |
| SP784 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Programmable Charge Pump |
| SP784CP | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Programmable Charge Pump |
| SP784CT | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Programmable Charge Pump |
| SP7875 | 制造商:SIPAT 制造商全稱:SIPAT 功能描述:SAW Filter Electrical Characteristic |
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