參數(shù)資料
型號(hào)： LTC2486CDE
廠商： LINEAR TECHNOLOGY CORP
元件分類： ADC
英文描述： 16-Bit 2-/4-Channel ツヒ ADC with PGA and Easy Drive Input Current Cancellation
中文描述： 4-CH 16-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PQCC14
封裝： 4 X 3 MM, PLASTIC, MO-229WGED-3, QFN-14
文件頁(yè)數(shù)： 20/36頁(yè)
文件大小： 596K
代理商： LTC2486CDE
LTC2486
20
2486f
Temperature Sensor
The LTC2486 includes an integrated temperature sensor.
The temperature sensor is selected by setting IM = 1. The
digital output is proportional to the absolute temperature
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 93.5μV/°C independent of V
REF
(see Figures 4 and 5). Slope calibration is not required if
the reference voltage (V
REF
) is known. A 5V reference has
a slope of 2.45 LSBs
16
/°C. The temperature is calculated
from the output code (where DATAOUT
16
is the decimal
representation of the 16-bit result) for a 5V reference using
the following formula:
T
K
= DATAOUT
16
/2.45 in Kelvin
If a different value of V
REF
is used, the temperature output
is:
T
K
= DATAOUT
16
/(0.49 V
REF
) in Kelvin
If the value of V
REF
is not known, the slope is determined by
measuring the temperature sensor at a known temperature
T
N
(in °K) and using the following formula:
SLOPE = DATAOUT
16
/T
N
APPLICATIONS INFORMATION
Table 5a. Performance vs Gain in Normal Speed Mode (V
CC
= 5V, V
REF
= 5V)
GAIN
1
Input Span
±2.5
LSB
38.1
Noise Free Resolution*
65536
Gain Error
5
Offset Error
0.5
Table 5b. Performance vs Gain in 2x Speed Mode (V
CC
= 5V, V
REF
= 5V)
GAIN
1
Input Span
±2.5
LSB
38.1
Noise Free Resolution*
65536
Gain Error
5
Offset Error
200
*The resolution in counts is calculated as the FS divided by LSB or the RMS noise value, whichever is larger.
4
8
16
32
64
128
256
UNIT
±0.625
9.54
65536
5
0.5
±0.312
4.77
65536
5
0.5
±0.156
2.38
65536
5
0.5
±78m
1.19
65536
5
0.5
±39m
0.596
65536
5
0.5
±19.5m
0.298
32768
5
0.5
±9.76m
0.149
16384
8
0.5
V
μV
Counts
ppm of FS
μV
2
4
8
16
32
64
128
UNIT
±1.25
19.1
65536
5
200
±0.625
9.54
65536
5
200
±0.312
4.77
65536
5
200
±0.156
2.38
65536
5
200
±78m
1.19
65536
5
200
±39m
0.596
45875
5
200
±19.5m
0.298
22937
5
200
V
μV
Counts
ppm of FS
μV
This value of slope can be used to calculate further tem-
perature readings using:
T
K
= DATAOUT
16
/SLOPE
All Kelvin temperature readings can be converted to T
C
(°C) using the fundamental equation:
T
C
= T
K
– 273
SERIAL INTERFACE TIMING MODES
The LTC2486’s 4-wire interface is SPI and MICROWIRE
compatible. This interface offers several flexible modes
of operation. These include internal/external serial clock,
3- or 4-wire I/O, single cycle or continuous conversion. The
following sections describe each of these timing modes
in detail. In all cases, the converter can use the internal
oscillator (F
O
= LOW) or an external oscillator connected
to the F
O
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.
External Serial Clock, Single Cycle Operation
This timing mode uses an external serial clock to shift out
the conversion result and
C
S to monitor and control the
state of the conversion cycle (see Figure 6).
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