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參數(shù)資料
| 型號： | LTC2402IMS |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | 1-/2-Channel 24-Bit uPower No Latency ADC in MSOP-10 |
| 中文描述： | 2-CH 24-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO10 |
| 封裝： | PLASTIC, MSOP-10 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 171K |
| 代理商： | LTC2402IMS |
8
LTC2401/LTC2402
APPLICATIOU
removed by the FS
SET
input to the ADC. The absolute full-
scale output of the ADC (data out = FFFFFF
HEX
) will occur
at V
IN
= V
B
= FS
SET
, see Figure 4. Similarly, the offset errors
due to R
P2
are removed by the ground sense input ZS
SET
.
The absolute zero output of the ADC (data out = 000000
HEX
)
occurs at V
IN
= V
A
= ZS
SET
. Parasitic resistors R
P3
to R
P5
have negligible errors due to the 1nA (typ) leakage current
at pins FS
SET
, ZS
SET
and V
IN
. The wide dynamic input
range (–300mV to 5.3V) and low noise (0.6ppm RMS)
enable the LTC2401 or the LTC2402 to directly digitize the
output of the bridge sensor.
W
U
U
00000
H
12.5%
EXTENDED
RANGE
A
FFFFF
H
ZS
SET
FS
SET
V
IN
24012 F04
12.5%
EXTENDED
RANGE
Figure 4. Transfer Curve with Zero-Scale and Full-Scale Set
The LTC2402 is ideal for applications requiring continu-
ous monitoring of two input sensors. As shown in
Figure 5, the LTC2402 can monitor both a thermocouple
temperature probe and a cold junction temperature sen-
sor. Absolute temperature measurements can be
performed with a variety of thermocouples using digital
cold junction compensation.
The selection between CH0 and CH1 is automatic. Initially,
after power-up, a conversion is performed on CH0. For
each subsequent conversion, the input channel selection
Figure 5. Isolated Temperature Measurement
V
CC
F
O
FS
SET
ZS
SET
SCK
CH1
SDO
GND
CS
THERMOCOUPLE
COLD JUNCTION
ISOLATION
BARRIER
PROCESSOR
CH0
–
+
1
10
12k
THERMISTOR
100
9
8
7
6
2
3
4
5
2.7V TO 5.5V
LTC2402
24012 F05
V
CC
LTC2401
FS
SET
GND
SCK
SDO
CS
V
IN
F
O
ZS
SET
3-WIRE
SPI INTERFACE
1
9
8
7
10
24012 F03
2
3
5
R
P2
R
P5
I
DC
= 0
R
P1
V
B
V
A
6
R
P4
I
DC
= 0
I
EXCITATION
R
P3
I
DC
= 0
Figure 3. Half-Bridge Digitizer with
Zero-Scale and Full-Scale Sense
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