LTC2402IMS Linear Technology, LTC2402IMS Datasheet - Page 27

• Manufacturer Part Number: LTC2402IMS
• Description: IC ADC 24BIT 2CH MICROPWR 10MSOP
• Manufacturer: Linear Technology

Specifications of LTC2402IMS

• Number Of Bits: 24
• Sampling Rate (per Second): 7.5
• Data Interface: MICROWIRE™, Serial, SPI™
• Number Of Converters: 2
• Power Dissipation (max): 1mW
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

APPLICATIO S I FOR ATIO
at V
errors due to R
ZS
000000
R
leakage current at pins FS
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.
The LTC2402 is ideal for applications requiring continu-
ous monitoring of two input sensors. As shown in
Figure 30, the LTC2402 can monitor both a thermocouple
P3
SET
IN
to R
. The absolute zero output of the ADC (data out =
= V
HEX
P5
B
) occurs at V
= FS
have negligible errors due to the 1nA (typ)
P2
SET
are removed by the ground sense input
U
, see Figure 29. Similarly, the offset
IN
= V
U
SET
THERMISTOR
A
, ZS
= ZS
Figure 29. Transfer Curve with Zero-Scale and Full-Scale Set
100
12k
SET
SET
W
00000
FFFFF
. Parasitic resistors
and V
Figure 30. Isolated Temperature Measurement
COLD JUNCTION
THERMOCOUPLE
H
H
+
IN
ZS
. The wide
U
SET
2.7V TO 5.5V
–
1
2
3
4
5
V
FS
CH1
ZS
V
CH0
CC
IN
SET
SET
LTC2402
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
is alternated. Embedded within the serial data output is a
status bit indicating which channel corresponds to the
conversion result. If the conversion was performed on
CH0, this bit (Bit 30) is LOW and is HIGH if the conversion
was performed on CH1 (see Figure 31).
SDO
GND
SCK
CS
F
O
FS
SET
10
9
8
7
6
ISOLATION
BARRIER
12.5%
EXTENDED
RANGE
12.5%
UNDER
RANGE
24012 F29
PROCESSOR
LTC2401/LTC2402
24012 F30
27