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