
39
0992D–BDC–04/09
e2v semiconductors SAS 2009
TS86101G2B
12.2
Digital Inputs and Data Ready Signal Implementation
Figure 12-4. Differential 3.3V PECL
Note:
Recommended values for R and VTT:
VTT = GND, R = 120 to 200
Ω
VTT = 1V, R = 50
Ω
Rule of thumb for determining R and VTT: (VOL-VTT)/R>Swing/100
Figure 12-5. Differential 2.5V PECL
Note:
Recommended values for R and VTT:
VTT = GND, R = 50
Ω
GND
10 pF
Z = 50
Ω
R
VTT
Z = 50
Ω
+ 3.3V PECL
Open
Emitter
Driver
VOH = 2.4V
VOL = 1.6V
MUXDAC
Data Input/Data Ready Input
50
Ω
50
Ω
GND
10 pF
Z = 50
Ω
R
VTT
Z = 50
Ω
+ 2.5V PECL
Open
Emitter
Driver
VOH = 1.6V
VOL = 0.8V
MUXDAC
Data Input/Data Ready Input
50
Ω
50
Ω