Table I - Output Coding
INDEX
0
1
2
....
123
124
125
....
254
255
ANALOG INPUT (V)
0.6078125
0.6078125 ~ 0.6156260
0.6156250 ~ 0.6234375
....
1.5921875 ~ 1.6000000
1.6000000 ~ 1.6078125
1.6078125 ~ 1.6156250
....
2.5843750 ~2.5921875
2.5921875 ~
DIGITAL
OUTPUT
00000000
00000001
00000010
....
01111111
10000000
10000001
....
11111110
11111111
V
RB
=0.6 V
V
RT
=2.6 V
1 LSB=7.8125 mV
Figure 1A: Timing Diagram
VIN (n)
VIN (n+1)
VIN (n+2)
VIN (n+3)
VIN
Clock
Data
Data (n-3)
Data (n-2)
Data (n-1)
Data (n)
t
d
Figure 1B: Tri-State Output Timing Diagram
50%
OE
2.5 V
220
Ω
DUT
50 pF
50%
OE
VOH
VOL
2.5 V
90%
OE
50%
90%
2.5 V
10%
TdisL
VOL
TeneL
OE
50%
90%
VOH
10%
2.5 V
TdisH
2.5 V
TeneH
SPT1175
4
6/24/97
CADEKA [ CADEKA MICROCIRCUITS LLC. ]
