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ADG3248 bảng dữ liệu(PDF) 7 Page - Analog Devices

tên linh kiện ADG3248
Giải thích chi tiết về linh kiện  2.5 V/ 3.3 V, 2 :1 Multiplexer/ Demultiplexer Bus Switch
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ADG3248 bảng dữ liệu(HTML) 7 Page - Analog Devices

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REV. 0
ADG3248
–7–
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 where 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 1 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 toler-
ant 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 ADC
2.5V
3.3V
2.5V
MICROPROCESSOR
3.3V
Figure 1. 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 will be clamped to within a voltage
threshold below the VCC supply.
In this case, the output will be limited to 2.5 V, as shown in
Figure 3. This device can be used for translation from 2.5 V to
3.3 V devices and also between two 3.3 V devices.
ADG3248
2.5V
2.5V
3.3V
2.5V
3.3V
Figure 2. 3.3 V to 2.5 V Voltage Translation
VIN
2.5V
VOUT
0V
3.3V
SWITCH
INPUT
3.3V SUPPLY
Figure 3. 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 will, as before, be clamped to within a
voltage threshold below the VCC supply. In this case, the output
will be limited to approximately 1.8 V, as shown in Figure 5.
ADG3248
1.8V
2.5V
2.5V
Figure 4. 2.5 V to 1.8 V Voltage Translation
VIN
1.8V
VOUT
0V
2.5V
SWITCH
INPUT
2.5V SUPPLY
Figure 5. 2.5 V to 1.8 V Voltage Translation
Analog Switching
Bus switches can be used in many analog switching applications,
for example, video graphics. Bus switches can have lower on
resistance, smaller ON and OFF channel capacitance, and thus
improved frequency performance than their analog counterparts.
The bus switch channel itself, consisting solely of an NMOS
switch, limits the operating voltage (see TPC 1 for a typical
plot), but in many cases, this does not present an issue.


Số phần tương tự - ADG3248

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Mô tả tương tự - ADG3248

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