參數(shù)資料
型號(hào)： DC1010A-A
廠商： Linear Technology
文件頁(yè)數(shù)： 11/32頁(yè)
文件大?。?/td> 0K
描述： BOARD DELTA SIGMA ADC LTC2493
軟件下載： QuikEval System
設(shè)計(jì)資源： DC1010A Design File
DC1010A Schematic
標(biāo)準(zhǔn)包裝： 1
系列： Easy Drive™, QuikEval™
ADC 的數(shù)量： 1
位數(shù)： 24
采樣率（每秒）： 15
數(shù)據(jù)接口： I²C，串行
已用 IC / 零件： LTC2493
已供物品： 板
相關(guān)產(chǎn)品： LTC2493IDE#TRPBF-ND - IC ADC 24BIT DELTA SIG 14-DFN
LTC2493CDE#TRPBF-ND - IC ADC 24BIT DELTA SIG 14-DFN
LTC2493CDE#PBF-ND - IC ADC 24BIT DELTA SIG 14-DFN
LTC2493IDE#PBF-ND - IC ADC 24BIT DELTA SIG 14-DFN
LTC2493
19
2493fd
Speed Mode (SPD)
Every conversion cycle, two conversions are combined
to remove the offset (default mode). This result is free
from offset and drift. In applications where the offset is
not critical, the auto-calibration feature can be disabled
with the benefit of twice the output rate.
While operating in the 2× mode (SPD = 1), the linearity
and full-scale errors are unchanged from the 2× mode
performance. In both the 2× and 2× mode there is no
latency. This enables input steps or multiplexer changes
to settle in a single conversion cycle, easing system over-
head and increasing the effective conversion rate. During
temperature measurements, the 1× mode is always used
independent of the value of SPD.
Temperature Sensor
The LTC2493 includes an integrated temperature sen-
sor. The temperature sensor is selected by setting
IM = 1. The ADC internally connects to the temperature
sensor and performs a conversion.
The digital output is proportional to the absolute tem-
perature of the device. This feature allows the converter
to perform cold junction compensation for external
thermocouples or continuously remove the temperature
effects of external sensors.
The internal temperature sensor output is 28mV at 27°C
(300°K), with a slope of 93.5V/°C independent of VREF
(see Figures 4 and 5). Slope calibration is not required if
the reference voltage (VREF) is known. A 5V reference has
a slope of 314 LSBs24/°C. The temperature is calculated
from the output code (where DATAOUT24 is the decimal
representationofthe24-bitresult)fora5Vreferenceusing
the following formula:
TK =
DATAOUT24
314
in Kelvin
If a different value of VREF is used, the temperature
output is:
TK =
DATAOUT24 VREF
1570
in Kelvin
If the value of VREF is not known, the slope is determined
bymeasuringthetemperaturesensorataknowntempera-
ture TN (in K) and using the following formula:
SLOPE =
DATAOUT24
TN
This value of slope can be used to calculate further tem-
perature readings using:
TK =
DATAOUT24
SLOPE
All Kelvin temperature readings can be converted to TC
(°C) using the fundamental equation:
TC = TK – 273
TEMPERATURE (K)
0
DA
TAOUT
24
60000
80000
100000
120000
140000
400
2493 F04
40000
0
300
200
100
20000
VCC = 5V
VREF = 5V
SLOPE = 314 LSB24/K
TEMPERATURE (°C)
–55 –30
–5
ABSOLUTE
ERROR
(°C)
5
4
3
2
1
–4
–3
–2
–1
0
120
95
70
45
20
2493 F05
–5
Figure 4. Internal PTAT Digital Output vs Temperature
Figure 5. Absolute Temperature Error
applicaTions inForMaTion
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