E749BPJ Datasheet, PDF (9/14 Pages) Semtech Corporation – Octal Pin Electronics Driver/Receiver

EDGE HIGH-PERFORMANCE PRODUCTS
Application Information (continued)
VHIGH A
VHIGH B
DVR EN*A
DVR DATA
DVR EN*B
VLOW B
VLOW A
CHANNEL 1
DUT0
DVR EN*A
DVR DATA
DVR EN*B
CHANNEL n
Figure 11. Family A/B Using Two Drivers Per Pin
Edge749
DUT0
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.
 2000 Semtech Corp.
Edge749 Ron vs. Vout - VCC=+16.5V, VEE=-1.5V
9.5
9
8.5
8
7.5
7
6.5
6
Vout [V]
Figure 12. ROUT vs. DOUT
R_VLO
R_VHI
Edge749 Leakage in HIZ - VCC=+16.5V, VEE=-1.5V
10
8
6
4
2
0
-2
-4
-6
-8
-10
Dout [Volts]
VLO=0, VHI=+8
Figure 13. High Impedance Leakage
9
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