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參數(shù)資料
| 型號： | AND8058D |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | Two New Analog Switches Set Standards for Space Efficiency |
| 中文描述： | 兩種新型模擬開關(guān)設(shè)置標準的工作效率 |
| 文件頁數(shù)： | 1/4頁 |
| 文件大?。?/td> | 26K |
| 代理商： | AND8058D |
Semiconductor Components Industries, LLC, 2001
April, 2001 – Rev. 0
1
Publication Order Number:
AND8058/D
AND8058/D
Two New Analog Switches
Set Standards for Space
Efficiency
Prepared by: Fred Zlotnick
ON Semiconductor
INTRODUCTION
Analog switches that provide analog and digital switching
to circuit designers, have been around for more than
30 years. One of the most popular switches has been the
4053, a triple Single–Pole Double–Throw (SPDT) switch in
a 16–pin package. The most aggressive common package
for this device is the TSSOP–16 which occupies 32 mm
2
of
board space or 10.5 mm
2
per switch.
The hand–held wireless phenomenon is driving the need
to get more functionality into even smaller spaces. In
response, ON Semiconductor released more than
30 single–gate switches that supply exactly the right bit of
logic just where it is needed. These products were released
in industry standard SC88A/SOT–353 packages which
occupy just over 4 mm
2
. These devices are all five leads and
provide standard logic functions. An example is the
MC74VHC1G66, a Single–Pole, Single–Throw (SPST)
analog switch.
The NLAS4599
The new NLAS4599 device is a single SPDT switch,
one–third the size of the venerable 4053, contained in an
aggressive 0.6
μ
CMOS technology. It provides voltage
breakdown greater than 7.0 V, low R
on
, and excellent high
frequency response. The NLAS4599 sets a new standard in
space efficiency. It occupies 4. mm
2
and provides the same
functionality as one–third of a 4053. Compared to the 4053,
the NLAS4599 is 2.5 times more space efficient. This is a
real boon to designers, who need to put as much
functionality as possible into every square inch.
Examples
1. Design a crystal–controlled oscillator that functions
at 32 KHz for minimum power consumption and
16 MHz for performance in a battery–operated
environment. The new NL27WZU04 provides two
unbuffered gates in a single 4 mm
2
package. One
gate is an oscillator; the second gate is a buffer. The
NLAS4599 is used to switch crystals. A single
control line (assumed to come from a
microcontroller) controls the frequency. When the
unit is near idle, the clock is 32 KHz and the
microcontroller/DSP functions at minimum power
consumption. When speed (performance) is
required, the clock switches to 16 MHz.
GND
CTRL
NLAS4599
GND
V
CC
32 kHz
16 MHz
12 p
12 p
12 M
1/2 NL7WZU04
OSC OUT
Figure 1. Dual Frequency Oscillator
V
CC
10 K
This circuit provides dual clock rates under microprocessor control and occupies minimal board space.
http://onsemi.com
APPLICATION NOTE
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