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參數(shù)資料
| 型號： | LTC2494IUHF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | 16-CH 16-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PQCC38 |
| 封裝： | 5 X 7 MM, PLASTIC, MO-220WKHD, QFN-38 |
| 文件頁數(shù)： | 13/36頁 |
| 文件大?。?/td> | 675K |
| 代理商： | LTC2494IUHF |
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LTC2494
0
2494fa
applicaTions inFormaTion
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
SERIAL INTERFACE TIMING MODES
The LTC2494’s 4-wire interface is SPI and MICROWIRE
compatible. This interface offers several flexible modes
of operation. These include internal/external serial clock,
3-or4-wireI/O,singlecycleorcontinuousconversion.The
following sections describe each of these timing modes
in detail. In all cases, the converter can use the internal
oscillator (FO = LOW) or an external oscillator connected
to the FO pin. For each mode, the operating cycle, data
input format, data output format, and performance remain
the same. Refer to Table 6 for a summary.
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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