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参数资料
| 型号： | AD8189Z-EVALZ |
| 厂商： | Analog Devices, Inc. |
| 英文描述： | 350 MHz Single-Supply (5 V) Triple 2:1 Multiplexers |
| 中文描述： | 350兆赫单电源（5V）的三重2:1多路复用器 |
| 文件页数： | 18/24页 |
| 文件大小： | 725K |
| 代理商： | AD8189Z-EVALZ |
AD8188/AD8189
Rev. 0 | Page 18 of 24
V
EE
D
GND
IN2B
IN2A
IN0A
IN0B
IN1A
DV
CC
OE
V
CC
SEL A/B
AD8188
5V
5V
V
REF
IN1B
TO A/D,
ETC.
+
–
+
–
+
–
10μF
0.1μF
0.1μF
OUT0
OUT1
OUT2
RGB
SOURCE A
R
G
B
RGB
SOURCE B
R
G
B
4.99k
5V
0.1μF
4.99k
75
0.1μF
4.99k
75
0.1μF
4.99k
75
0.1μF
4.99k
75
0.1μF
4.99k
75
0.1μF
4.99k
75
HI = ENABLE
LO = DISABLE
HI = A
LO = B
4.99k
5V
4.99k
5V
4.99k
5V
4.99k
5V
4.99k
5V
0
Figure 54. AD8188 AC-Coupling Using Separate Voltage Dividers
V
EE
D
GND
IN2B
IN2A
IN0A
IN0B
IN1A
DV
CC
OE
V
CC
SEL A/B
AD8188
5V
5V
V
REF
IN1B
TO A/D,
ETC.
+
–
+
–
+
–
10μF
0.1μF
0.1μF
OUT0
OUT1
OUT2
RGB
SOURCE A
R
G
B
RGB
SOURCE B
R
G
B
0.1μF
75
0.1μF
75
0.1μF
75
0.1μF
75
0.1μF
V
MID
75
0.1μF
75
HI = ENABLE
LO = DISABLE
HI = A
LO = B
100
100
0.1μF
10μF
5V
4.99k
V
MID
4.99k
V
MID
4.99k
V
MID
4.99k
V
MID
4.99k
V
MID
4.99k
V
MID
0
Figure 55. AD8188 AC-Coupling Using a Single V
MID
Reference
The circuit in Figure 55 can increase the crosstalk between
inputs, because each input signal creates a small signal on V
MID
due to its nonzero impedance. There are several means to
minimize this. First, make the impedance of the V
MID
divider
small. Small resistor values lower the dc resistance, and good
bypassing to ground minimizes the ac impedance. It is also
possible to use a voltage regulator or another system supply
voltage if it is the correct value. It should be close to the mid-
supply voltage of the AD8188.
The second technique for minimizing crosstalk is to use large
resistor values to connect from the inputs to V
MID
. The major factor
limiting the value of these resistors is offset caused by the input
bias current (I
B
) that must flow through these resistors to the
AD8188 inputs. The typical I
B
for an AD8188 input is 1.5 μA,
which causes an offset voltage of 1.5 mV per 1 kΩ of resistance.
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