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PDF ADG3248 Data sheet ( Hoja de datos )
| Número de pieza | ADG3248 | |
| Descripción | Multiplexer / Demultiplexer Bus Switch | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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FEATURES
225 ps propagation delay through the switch
4.5 Ω switch connection between ports
Data rate 1.244 Gbps
2.5 V/3.3 V supply operation
Level translation
3.3 V to 2.5 V
2.5 V to 1.8 V
Small signal bandwidth 610 MHz
6-lead SC70 package
APPLICATIONS
3.3 V to 2.5 V voltage translation
2.5 V to 1.8 V voltage translation
Bus switching
Docking stations
Memory switching
Analog switch applications
GENERAL DESCRIPTION
The ADG3248 is a 2.5 V or 3.3 V, high performance 2:1
multiplexer/demultiplexer. It is designed on a low voltage
CMOS process, which provides low power dissipation yet gives
high switching speed and very low on resistance. The low on
resistance allows the input to be connected to the output
without additional propagation delay or generating additional
ground bounce noise.
Each switch of the ADG3248 conducts equally well in both
directions when on. The ADG3248 exhibits break-before-make
switching action, preventing momentary shorting when
switching channels.
The ADG3248 is available in a tiny 6-lead SC70 package.
2.5 V/3.3 V, 2:1 Multiplexer/
Demultiplexer Bus Switch
ADG3248
FUNCTIONAL BLOCK DIAGRAM
ADG3248
A0
B
A1
IN
NOTES
1. SWITCHES SHOWN FOR A LOGIC 0 INPUT
Figure 1.
Table 1. ADG3248 Truth Table
IN Pin Logic Level Function
Low (L)
B = A0
High (H)
B = A1
PRODUCT HIGHLIGHTS
1. 3.3 V or 2.5 V supply operation.
2. Extremely low propagation delay through switch.
3. 4.5 Ω switches connect inputs to outputs.
4. Tiny SC70 package.
Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2003–2007 Analog Devices, Inc. All rights reserved.
1 page  
ADG3248
ABSOLUTE MAXIMUM RATINGS
TA = 25°C, unless otherwise noted.
Table 3.
Parameter
VCC to GND
Digital Inputs to GND
DC Input Voltage
DC Output Current
Operating Temperature Range
Industrial (B Version)
Storage Temperature Range
Junction Temperature
θJA Thermal Impedance
Lead Soldering
Lead Temperature, Soldering (10 sec)
IR Reflow, Peak Temperature
Pb-Free Soldering
Reflow, Peak Temperature
Time at Peak Temperature
Rating
−0.5 V to +4.6 V
−0.5 V to +4.6 V
−0.5 V to +4.6 V
25 mA per channel
−40°C to +85°C
−65°C to +150°C
150°C
332°C/W
300°C
220°C
260(+0/−5)°C
20 sec to 40 sec
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ESD CAUTION
Rev. A | Page 4 of 12
5 Page 
ADG3248
BUS SWITCH APPLICATIONS
MIXED VOLTAGE OPERATION, LEVEL
TRANSLATION
Bus switches can provide an ideal solution for interfacing between
mixed voltage systems. The ADG3248 is suitable for applications
in which voltage translation from 3.3 V technology to a lower
voltage technology is needed. This device can translate from 2.5 V
to 1.8 V or bidirectionally from 3.3 V directly to 2.5 V.
Figure 20 shows a block diagram of a typical application in
which a user needs to interface between a 3.3 V ADC and a 2.5 V
microprocessor. The microprocessor may not have 3.3 V
tolerant inputs; therefore, placing the ADG3248 between the
two devices allows the devices to communicate easily. The bus
switch directly connects the two blocks, thus introducing
minimal propagation delay, timing skew, or noise.
3.3V
3.3V
2.5V
3.3V ADC
2.5V
MICROPROCESSOR
Figure 20. Level Translation Between a 3.3 V ADC and a 2.5 V Microprocessor
3.3 V to 2.5 V Translation
When VCC is 3.3 V and the input signal range is 0 V to VCC, the
maximum output signal is clamped to within a voltage threshold
below the VCC supply.
In this case, the output is limited to 2.5 V, as shown in Figure 22.
This device can be used for translation from 2.5 V to 3.3 V
devices and also between two 3.3 V devices.
3.3V
3.3V
ADG3248
2.5V
2.5V
2.5V
Figure 21. 3.3 V to 2.5 V Voltage Translation
VOUT
2.5V
3.3V SUPPLY
VIN
0V SWITCH 3.3V
INPUT
Figure 22. 3.3 V to 2.5 V Voltage Translation
2.5 V to 1.8 V Translation
When VCC is 2.5 V and the input signal range is 0 V to VCC, the
maximum output signal is, as before, clamped to within a voltage
threshold below the VCC supply. In this case, the output is limited
to approximately 1.8 V, as shown in Figure 24.
2.5V
2.5V ADG3248
1.8V
Figure 23. 2.5 V to 1.8 V Voltage Translation
VOUT
2.5V SUPPLY
1.8V
VIN
0V SWITCH 2.5V
INPUT
Figure 24. 2.5 V to 1.8 V Voltage Translation
ANALOG SWITCHING
Bus switches can be used in many analog switching applica-
tions, for example, video graphics. Bus switches can have lower
on resistance, smaller on and off channel capacitance, and thus
better frequency performance than their analog counterparts.
The bus switch channel itself, consisting solely of an NMOS
switch, limits the operating voltage (see Figure 3 for a typical
plot) but, in many cases, this does not present an issue.
Rev. A | Page 10 of 12
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet ADG3248.PDF ] | |
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