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LTC2421 Datasheet(PDF) 27 Page - Linear Technology

No. de pieza LTC2421
Descripción Electrónicos  1-/2-Channel 20-Bit Power No Latency ADCs in MSOP-10
PDF  32 Pages
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Fabricante Electrónico  LINER [Linear Technology]
Página de inicio  http://www.linear.com
Logo LINER - Linear Technology

LTC2421 Datasheet(HTML) 27 Page - Linear Technology

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LTC2421/LTC2422
24212f
APPLICATIO S I FOR ATIO
resistance RP1 in series with the half-bridge sensor are
removed by the FSSET input to the ADC. The absolute full-
scale output of the ADC (data out = FFFFFHEX ) will occur
at VIN = VB = FSSET, see Figure 31. Similarly, the offset
errors due to RP2 are removed by the ground sense input
ZSSET. The absolute zero output of the ADC (data out =
00000HEX) occurs at VIN = VA = ZSSET. Parasitic resistors
RP3 to RP5 have negligible errors due to the 1nA (typ)
leakage current at pins FSSET, ZSSET and VIN. The wide
dynamic input range (– 300mV to 5.3V) and low noise
(1.2ppm RMS) enable the LTC2421 or the LTC2422 to
directly digitize the output of the bridge sensor.
The LTC2422 is ideal for applications requiring continu-
ous monitoring of two input sensors. As shown in
Figure 32, the LTC2422 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.
Figure 31. Transfer Curve with Zero-Scale and Full-Scale Set
Figure 30. Half-Bridge Digitizer with
Zero-Scale and Full-Scale Sense
Figure 29. Errors Due to Excitation Currents
VFULL-SCALE ERROR
SENSOR
SENSOR OUTPUT
RP1
IEXCITATION
+
–
VOFFSET ERROR
+
–
+
–
RP2
24212 F29
VCC
LTC2421
FSSET
GND
SCK
VIN
SDO
FO
CS
ZSSET
3-WIRE
SPI INTERFACE
1
9
8
7
10
24212 F03
2
3
5
RP2
RP5
IDC ≅ 0
RP1
VB
VA
6
RP4
IDC ≅ 0
IEXCITATION
RP3
IDC ≅ 0
00000H
12.5%
UNDER
RANGE
FFFFFH
ZSSET
FSSET
VIN
24212 F31
12.5%
EXTENDED
RANGE
Figure 32. Isolated Temperature Measurement
VCC
FO
FSSET
ZSSET
SCK
CH1
SDO
GND
CS
THERMOCOUPLE
COLD JUNCTION
ISOLATION
BARRIER
PROCESSOR
CH0
–
+
110
12k
THERMISTOR
100
Ω
9
8
7
6
2
3
4
5
2.7V TO 5.5V
LTC2422
24212 F32



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