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參數資料
型號: ADG3247BCP
廠商: ANALOG DEVICES INC
元件分類: 通用總線功能
英文描述: 2.5 V/3.3 V, 16-Bit, 2-Port Level Translating, Bus Switch
中文描述: DUAL 8-BIT DRIVER, TRUE OUTPUT, QCC40
封裝: 6 X 6 MM, MO-220-VJJD-2, CSP-40
文件頁數: 9/12頁
文件大小: 204K
代理商: ADG3247BCP
PRELIMINARY TECHNICAL DATA
REV. PrD
ADG3247
–9–
BUS SWITCH APPLICATIONS
Mixed Voltage Operation, Level Translation
Bus switches can be used to provide an ideal solution for inter-
facing between mixed voltage systems. The ADG3247 is suitable
for applications where voltage translation from 3.3 V technology to
a lower voltage technology is needed. This device can translate
from 3.3 V to 1.8 V, from 2.5 V to 1.8 V, or bidirectionally from
3.3 V directly to 2.5 V.
Figure 4 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 micro-
processor. The microprocessor may not have 3.3 V tolerant inputs;
therefore placing the ADG3247 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
A
3.3V
Figure 4. Level Translation between a 3.3 V ADC
and a 2.5 V Microprocessor
3.3 V to 2.5 V Translation
When V
CC
is 3.3 V (
SEL
= V
CC
) and the input signal range is 0 V
to V
CC
, the maximum output signal will be clamped to within
a voltage threshold below the V
CC
supply.
ADG3247
2.5V
2.5V
3.3V
2.5V
3.3V
Figure 5. 3.3 V to 2.5 V Voltage Translation,
SEL
= V
CC
In this case, the output will be limited to 2.5 V, as shown in
Figure 6.
V
IN
2.5V
V
OUT
0V
3.3V
SWITCH
INPUT
S
O
3.3V SUPPLY
SEL
= 3.3V
Figure 6. 3.3 V to 2.5 V Voltage Translation,
SEL
= V
CC
This device can be used for translation from 2.5 V to 3.3 V
devices, and also between two 3.3 V devices.
2.5 V to 1.8 V Translation
When V
CC
is 2.5 V (
SEL
= V
CC
) and the input signal range is 0 V
to V
CC
, the maximum output signal will, as before, be clamped
to within a voltage threshold below the V
CC
supply.
ADG3247
1.8V
2.5V
2.5V
Figure 7. 2.5 V to 1.8 V Voltage Translation,
SEL
= V
CC
In this case, the output will be limited to approximately 1.8 V,
as shown in Figure 7.
V
IN
1.8V
V
OUT
0V
2.5V
SWITCH
INPUT
S
O
2.5V SUPPLY
SEL
= 2.5V
Figure 8. 2.5 V to 1.8 V Voltage Translation,
SEL
= V
CC
3.3 V to 1.8 V Translation
The ADG3247 offers the option of interfacing between a 3.3 V
device and a 1.8 V device. This is possible through use of the
SEL
pin.
SEL
pin: An active low control pin.
SEL
activates internal
circuitry in the ADG3247 that allows voltage translation between
3.3 V devices and 1.8 V devices.
ADG3247
1.8V
3.3V
3.3V
Figure 9. 3.3 V to 1.8 V Voltage Translation,
SEL
= 0 V
When V
CC
is 3.3 V and the input signal range is 0 V to V
CC
, the
maximum output signal will be clamped to 1.8 V, as shown in
Figure 9. To do this, the
SEL
pin must be tied to Logic 0. If
SEL
is unused, it should be tied directly to V
CC
.
相關PDF資料
PDF描述
ADG3247BRU 2.5 V/3.3 V, 16-Bit, 2-Port Level Translating, Bus Switch
ADG3247 2.5 V/3.3 V, 16-Bit, 2-Port Level Translating, Bus Switch
ADG3248 2.5 V/ 3.3 V, 2 :1 Multiplexer/ Demultiplexer Bus Switch
ADG3248BKS-R2 2.5 V/ 3.3 V, 2 :1 Multiplexer/ Demultiplexer Bus Switch
ADG3248BKS-REEL 2.5 V/ 3.3 V, 2 :1 Multiplexer/ Demultiplexer Bus Switch
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