
14
LTC1411
1411f
APPLICATIO S I FOR ATIO
WU
UU
Figure 12. LTC1411 Bipolar Transfer Characteristics
(2’s Complement)
Figure 11b. CONVST Starts a Conversion with a Short Active High Pulse
Figure 11a. CONVST Starts a Conversion with a Short Active Low Pulse
Figure 13. Offset and Full-Scale Adjustment
DATA N
DB13 TO DB0
DATA (N + 1)
DB13 TO DB0
DATA (N – 1)
DB13 TO DB0
CONVST
BUSY
1411 F11a
t2
tCONV
t3
tACQ
t4
DATA
(SAMPLE N)
DATA (N – 1)
DB13 TO DB0
(SAMPLE N)
CONVST
BUSY
1411 F11b
tCONV
t3
t5
t4
DATA N
DB13 TO DB0
DATA (N + 1)
DB13 TO DB0
DATA
t3
t5
tACQ
INPUT VOLTAGE (V)
2.5V
OUTPUT
CODE
–1
LSB
1411 F12
011...111
011...110
000...001
000...000
100...000
100...001
111...110
1
LSB
BIPOLAR
ZERO
111...111
FS/2 – 1LSB
–FS/2
1LSB =
=
= 219.7
V
3.6V
16384
FS
16384
R7
51
R1
51
R3
51k
R2
10k
OFFSET
ADJUST
FULL-SCALE
ADJUST
5V
R4
100k
R5
750
R6
100k
5V
AIN
+
AIN
–
LTC1411
REFIN
1411 F13