Edge749
TEST AND MEASUREMENT PRODUCTS
Application Information
(continued)
CHANNEL 1
VHIGH A
VHIGH B
CHANNEL n
DVR EN*A
DVR EN*A
DVR DATA
DVR DATA
DUT0
DVR EN*B
DVR EN*B
DUT0
VLOW B
VLOW A
Figure 11. Family A/B Using Two Drivers Per Pin
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.
Edge749 Ron vs. Vout - VCC=+16.5V, VEE=-1.5V
9.5
9
Ron [Ohms]
8.5
8
7.5
7
6.5
6
-1.5
-0.5
9.5
10.5
11.1
12.5
13.5
14.5
15.5
16.5
0.5
1.5
2.5
3.5
4.5
5.5
6.5
7.5
8.5
R_VLO
R_VHI
Vout [V]
Figure 12. ROUT vs. DOUT
Edge749 Leakage in HIZ - VCC=+16.5V, VEE=-1.5V
10
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.
Leakage Current [nA]
8
6
4
2
0
- 2
- 4
- 6
- 8
-10
VLO=0, VHI=+8
- 3
- 2
- 1
10
11
12
13
14
15
16
Dout [Volts]
Figure 13. High Impedance Leakage
Revision 3 / October 21, 2002
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