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参数资料
| 型号： | E749-EDGE749 |
| 英文描述： | Octal Pin Electronics Driver / Receiver |
| 中文描述： | 八路引脚电子驱动器/接收器 |
| 文件页数： | 15/15页 |
| 文件大小： | 152K |
| 代理商： | E749-EDGE749 |
9
Revision 3 / October 21, 2002
www .semtech.com
TEST AND MEASUREMENT PRODUCTS
Edge749
Application Information (continued)
Driver Output Impedance
Ideally, a driver would have a constant
output impedance over all ouptut
conditions.
However, the Edge749
ouptut impedance does vary slightly
over the common mode drive level and
whether it is driving high or low. Figure
12 shows the variation in Rout.
High Impedance Leakage
The Edge749 is designed to be
extremely low leakage (see Figure 13.)
In a low performance application, where
the output capacitance is not a concern,
the low leakage may allow the
elimination of an isolation relay.
Figure 12. ROUT vs. DOUT
Figure 13. High Impedance Leakage
Edge749 Ron vs. Vout - VCC=+16.5V, VEE=-1.5V
Vout [V]
Ron
[Ohms]
6
6.5
7
7.5
8
8.5
9
9.5
-1.5
-0.5
0.5
1.5
2.5
3.5
4.5
5.5
6.5
7.5
8.5
9.5
10.5
11.1
12.5
13.5
14.5
15.5
16.5
R_VLO
R_VHI
Edge749 Leakage in HIZ - VCC=+16.5V, VEE=-1.5V
Dout [Volts]
Leakage
Current
[nA]
-10
-8
-6
-4
-2
0
2
4
6
8
10
-3
-2
-1
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
VLO=0, VHI=+8
Figure 11. Family A/B Using Two Drivers Per Pin
DUT0
DVR DATA
DVR EN*A
DVR EN*B
VHIGH A
VLOW B
VHIGH B
VLOW A
CHANNEL 1
DUT0
DVR DATA
DVR EN*A
DVR EN*B
CHANNEL n
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