ISL83483, ISL83485, ISL83488, ISL83490, ISL83491
Test Circuits and Waveforms
VCC DE
DI
Z
D
Y
VOD
RL/2
RL/2 VOC
VCC DE
DI
Z
D
Y
VOD
375Ω
RL = 60Ω
VCM
-7V to +12V
375Ω
FIGURE 1A. VOD AND VOC
FIGURE 1B. VOD WITH COMMON MODE LOAD
FIGURE 1. DC DRIVER TEST CIRCUITS
DE
3V
DI
SIGNAL
GENERATOR
Z
D
Y
CL = 15pF
RDIFF = 60Ω
CL = 15pF
DI
OUT (Y)
1.5V
tPLH
50%
3V
1.5V
0V
tPHL
50%
VOH
VOL
FIGURE 2A. DIFFERENTIAL TEST CIRCUIT
OUT (Z)
tPHL
50%
tPLH
50%
VOH
VOL
DE
3V
DI
SIGNAL
GENERATOR
Z
D
Y
OUT
RL = 27Ω
VOM
CL = 15pF
VOH + VOL
VOM =
2
≈1.5V
tDD
DIFF OUT (Y - Z)
50%
10%
tR
90%
SKEW = |tPLH (Y or Z) - tPHL (Z or Y)|
tDD
90%
50%
10%
tF
+VOD
-VOD
FIGURE 2C. SINGLE ENDED TEST CIRCUIT
FIGURE 2B. MEASUREMENT POINTS
FIGURE 2. DRIVER PROPAGATION DELAY AND DIFFERENTIAL TRANSITION TIMES
8