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參數(shù)資料
| 型號(hào)： | ADG3245BCPZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 12/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC SW BUS 2.5-3.3V 8BIT 20LFCSP |
| 標(biāo)準(zhǔn)包裝： | 490 |
| 類型： | 總線開關(guān) |
| 電路： | 8 x 1:1 |
| 獨(dú)立電路： | 1 |
| 電壓電源： | 單電源 |
| 電源電壓： | 2.5V, 3.3V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-VFQFN 裸露焊盤，CSP |
| 供應(yīng)商設(shè)備封裝： | 20-LFCSP-VQ |
| 包裝： | 托盤 |
REV.
ADG3245
–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 ADG3245 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
microprocessor. The microprocessor may not have 3.3 V toler-
ant inputs, therefore placing the ADG3245 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
ADG3245
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 VCC is 3.3 V (
SEL = 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.
ADG3245
2.5V
3.3V
2.5V
3.3V
Figure 5. 3.3 V to 2.5 V Voltage Translation,
SEL = VCC
In this case, the output will be limited to 2.5 V, as shown in
Figure 6.
VIN
2.5V
VOUT
0V
3.3V
SWITCH
INPUT
S
WITCH
O
UTPUT
3.3V SUPPLY
SEL = 3.3V
Figure 6. 3.3 V to 2.5 V Voltage Translation,
SEL = VCC
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 VCC is 2.5 V (
SEL = 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.
ADG3245
1.8V
2.5V
Figure 7. 2.5 V to 1.8 V Voltage Translation,
SEL = 2.5 VCC
In this case, the output will be limited to approximately
1.8 V, as shown in Figure 7.
VIN
1.8V
VOUT
0V
2.5V
SWITCH
INPUT
S
WITCH
O
UTPUT
2.5V SUPPLY
SEL = 2.5V
Figure 8. 2.5 V to 1.8 V Voltage Translation,
SEL = VCC
3.3 V to 1.8 V Translation
The ADG3245 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 ADG3245 that allows voltage translation
between 3.3 V devices and 1.8 V devices.
ADG3245
1.8V
3.3V
Figure 9. 3.3 V to 1.8 V Voltage Translation,
SEL = 0 V
When VCC is 3.3 V and the input signal range is 0 V to VCC, 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.
B
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| ADG3246 | 制造商:AD 制造商全稱:Analog Devices 功能描述:2.5 V/3.3 V, 10-Bit, 2-Port Level Translating, Bus Switch |
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