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參數(shù)資料
| 型號(hào)： | ADG3246BCP |
| 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, 10-Bit, 2-Port Level Translating, Bus Switch |
| 中文描述： | 10-BIT DRIVER, TRUE OUTPUT, QCC24 |
| 封裝： | 4 X 4 MM, MO-220-VGGD-2, CSP-24 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大小： | 353K |
| 代理商： | ADG3246BCP |
PRELIMINARY TECHNICAL DATA
REV. Pr
C
ADG3246
–9–
BUS SWITCH APPLICATIONS
Mixed Voltage Operation, Level Translation
Bus switches can be used to provide an ideal solution for interfac-
ing between mixed voltage systems. The ADG3246 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 ADG3246 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 max output signal will be clamped to within a voltage
threshold below the V
CC
supply.
ADG3246
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 max output signal will, as before, be clamped to
within a voltage threshold below the V
CC
supply.
ADG3246
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 ADG3246 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 cir-
cuitry in the ADG3246 that allows voltage translation between
3.3 V devices and 1.8 V devices.
ADG3246
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
max 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
.
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