參數(shù)資料
型號： LTC1294DM
廠商： Linear Technology Corporation
英文描述： Single Chip 12-Bit Data Acquisition System
中文描述： 單芯片12位數(shù)據(jù)采集系統(tǒng)
文件頁數(shù)： 12/28頁
文件大?。?/td> 494K
代理商： LTC1294DM
12
LTC1293/LTC1294/LTC1296
U
S
A
O
PPLICATI
IU
U
Bipolar Transfer Curve (UNI = 0)
OUTPUT CODE
1 1 1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1 1 0
1 0 0 0 0 0 0 0 0 0 0 1
1 0 0 0 0 0 0 0 0 0 0 0
INPUT VOLTAGE
–1LSB
–2LSB
–(V
REF
) + 1LSB
– (V
REF
)
INPUT VOLTAGE
(V
REF
= 5V)
–0.0024V
–0.0048V
–4.9976V
–5.00000V
OUTPUT CODE
0 1 1 1 1 1 1 1 1 1 1 1
0 1 1 1 1 1 1 1 1 1 1 0
0 0 0 0 0 0 0 0 0 0 0 1
0 0 0 0 0 0 0 0 0 0 0 0
INPUT VOLTAGE
V
REF
– 1LSB
V
REF
– 2LSB
1LSB
0V
INPUT VOLTAGE
(V
REF
= 5V)
4.9976V
4.9851V
0.0024V
0V
LTC1293 AI04a
Bipolar Output Code (UNI = 0)
INPUT
CONFIGURATION
Single-Ended
UNIPOLAR MODE
BIPOLAR MODE
–(REF
+
– REF
–
) + COM
Lower Value COM
Upper Value (REF
+
– REF
–
) + COM (REF
+
– REF
–
) + COM
Lower Value IN
–
Upper Value (REF
+
– REF
–
) + IN
–
Differential
–(REF
+
– REF
–
) + IN
–
(REF
+
– REF
–
) + IN
–
The following discussion will demonstrate how the two
reference pins are to be used in conjunction with the
analog input multiplexer. In unipolar mode the input span
of the A/D is set by the difference in voltage on the REF
+
pin
and the REF
–
pin. In the bipolar mode the input span is
twice the difference in voltage on the REF
+
pin and the
REF
–
pin. In the unipolar mode the lower value of the input
span is set by the voltage on the COM pin for single-ended
inputs and by the voltage on the minus input pin for
differential inputs. For the bipolar mode of operation the
voltage on the COM pin or the minus input pin set the
center of the input span.
The upper and lower value of the input span can now be
summarized in the following table:
The reference voltages REF
+
and REF
–
can fall between
V
CC
and V
–
, but the difference (REF
+
– REF
–
) must be less
than or equal to V
CC
. The input voltages must be less than
or equal to V
CC
and greater than or equal to V
–
. For the
LTC1293 REF
–
= 0V.
The following examples are for a single-ended input con-
figuration.
Example 1:
Let V
CC
= 5V, V
–
= 0V, REF
+
= 4V, REF
–
= 1V
and COM = 0V. Unipolar mode of operation. The resulting
input span is 0V
≤
IN
+
≤
3V.
1
V
R
–
V
R
–
V
R
V
IN
1 1 1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1 1 0
0 0 0 0 0 0 0 0 0 0 0 1
0 0 0 0 0 0 0 0 0 0 0 0
0 1 1 1 1 1 1 1 1 1 1 0
0 1 1 1 1 1 1 1 1 1 1 1
1 0 0 0 0 0 0 0 0 0 0 1
1 0 0 0 0 0 0 0 0 0 0 0
–
–
–
R
–
R
+
LTC1293 AI04b
相關PDF資料
PDF描述
LTC1294DMJ Single Chip 12-Bit Data Acquisition System
LTC1296 Quad, Micropower, LinCMOS(TM) Comparator 14-SO
LTC1296BI Single Chip 12-Bit Data Acquisition System
LTC1296BIJ Quad, Micropower, LinCMOS(TM) Comparator 14-TSSOP
LTC1296BIN Single Chip 12-Bit Data Acquisition System
相關代理商/技術參數(shù)
參數(shù)描述
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