參數(shù)資料
型號： DC1011A-C
廠商： Linear Technology
文件頁數(shù)： 14/38頁
文件大?。?/td> 0K
描述： BOARD DELTA SIGMA ADC LTC2494
軟件下載： QuikEval System
設計資源： DC1011A Schematic
DC1011A Design Files
標準包裝： 1
系列： Easy Drive™, QuikEval™
ADC 的數(shù)量： 1
位數(shù)： 16
采樣率（每秒）： 15
數(shù)據(jù)接口： MICROWIRE?，串行，SPI?
已用 IC / 零件： LTC2494
已供物品： 板
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LTC2494
2494fd
applications inForMation
GAIN (GS2, GS1, GS0)
The input referred gain of the LTC2494 is adjustable
from 1 to 256 (see Tables 5a and 5b). With a gain of 1,
the differential input range is ±VREF/2 and the common
mode input range is rail-to-rail. As the gain is increased,
the differential input range is reduced to ±0.5 VREF/Gain
but the common mode input range remains rail-to-rail.
As the differential gain is increased, low level voltages
are digitized with greater resolution. At a gain of 256, the
LTC2494 digitizes an input signal range of ±9.76mV with
over 16,000 counts.
Temperature Sensor
The LTC2494 includes an integrated temperature sensor.
The temperature sensor is selected by setting IM = 1.
During temperature readings, MUXOUTN/MUXOUTP
remains connected to the selected input channel. 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.
Slope calibration is not required if the reference voltage
(VREF) is known. A 5V reference has a slope of 2.45
LSBs16/°C. The temperature is calculated from the output
code (where DATAOUT16 is the decimal representation of
the 16-bit result) for a 5V reference using the following
formula:
TK = DATAOUT16/2.45 in Kelvin
If a different value of VREF is used, the temperature output
is:
TK = DATAOUT16 VREF/12.25 in Kelvin
IfthevalueofVREFisnotknown,theslopeisdeterminedby
measuringthetemperaturesensorataknowntemperature
TN (in °K) and using the following formula:
SLOPE = DATAOUT16/TN
This value of slope can be used to calculate further tem-
perature readings using:
TK = DATAOUT16/SLOPE
All Kelvin temperature readings can be converted to TC
(°C) using the fundamental equation:
TC = TK – 273
Table 5a. Performance vs Gain in Normal Speed Mode (VCC = 5V, VREF = 5V)
GAIN
1
4
8
16
32
64
128
256
UNIT
Input Span
±2.5
±0.625
±0.312
±0.156
±78m
±39m
±19.5m
±9.76m
V
LSB
38.1
9.54
4.77
2.38
1.19
0.596
0.298
0.149
V
Noise Free Resolution*
65536
32768
16384
Counts
Gain Error
5
8
ppm of FS
Offset Error
0.5
V
Table 5b. Performance vs Gain in 2x Speed Mode (VCC = 5V, VREF = 5V)
GAIN
1
2
4
8
16
32
64
128
UNIT
Input Span
±2.5
±1.25
±0.625
±0.312
±0.156
±78m
±39m
±19.5m
V
LSB
38.1
19.1
9.54
4.77
2.38
1.19
0.596
0.298
V
Noise Free Resolution*
65536
45875
22937
Counts
Gain Error
5
ppm of FS
Offset Error
200
V
*The resolution in counts is calculated as the FS divided by LSB or the RMS noise value, whichever is larger.
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