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參數(shù)資料
| 型號： | LTC2492IDE#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | 4-CH 24-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO14 |
| 封裝： | 4 X 3 MM, PLASTIC, MO-229WGED-3, QFN-14 |
| 文件頁數(shù)： | 11/36頁 |
| 文件大?。?/td> | 652K |
| 代理商： | LTC2492IDE#TR |
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LTC2492
2492fa
a new input word with EN = 1 (the first three bits are 101)
and EN2 = 1 is shifted into the device.
Rejection Mode (FA, FB)
The LTC2492 includes a high accuracy on-chip oscillator
with no required external components. Coupled with an
integrated 4th order digital low pass filter, the LTC2492
rejects line frequency noise. In the default mode, the
LTC2492 simultaneously rejects 50Hz and 60Hz by at least
87dB. If more rejection is required, the LTC2492 can be
configured to reject 50Hz or 60Hz to better than 110dB.
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
2x mode (SPD = 1), the linearity and full-scale errors are
unchanged from the 1x mode performance. In both the 1x
and 2x mode there is no latency. This enables input steps
or multiplexer changes to settle in a single conversion
cycle,easingsystemoverheadandincreasingtheeffective
conversionrate.Duringtemperaturemeasurements,the1x
mode is always used independent of the value of SPD.
Temperature Sensor
The LTC2492 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
coldjunctioncompensationforexternalthermocouplesor
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
applicaTions inFormaTion
Table 4. Converter Configuration
1
0
EN
SGL
ODD
A2
A1
A0
EN2
IM
FA
FB
SPD
CONVERTER CONFIGURATION
1
0
X
keep Previous
1
0
1
X
0
X
keep Previous
0
X
keep Previous
1
0
1
X
1
0
External Input (See Table 3)
50Hz/60Hz Rejection, 1x
1
0
1
X
1
0
1
0
External Input (See Table 3)
50Hz Rejection, 1x
1
0
1
X
1
0
1
0
External Input (See Table 3)
60Hz Rejection, 1x
1
0
1
X
1
0
1
External Input (See Table 3)
50Hz/60Hz Rejection, 2x
1
0
1
X
1
0
1
External Input (See Table 3)
50Hz Rejection, 2x
1
0
1
X
1
0
1
0
1
External Input (See Table 3)
60Hz Rejection, 2x
1
0
1
X
1
0
X
Measure Temperature
50Hz/60Hz Rejection, 1x
1
0
1
X
1
0
1
X
Measure Temperature
50Hz Rejection, 1x
1
0
1
X
1
0
X
Measure Temperature
60Hz Rejection, 1x
1
0
1
X
1
X
1
X
Reserved, Do Not Use
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