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LTC2492
19
2492fd
a new input word with EN = 1 (the rst 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 lowpass lter, the LTC2492 re-
jects 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 congured
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 benet of twice the output rate. While operating in the
2x mode (SPD = 1), the linearity and full-scale errors are
unchanged from the 1
× mode performance. In both the
1
× and 2× mode there is no latency. This enables input
steps or multiplexer changes to settle in a single conversion
cycle, easing system overhead and increasing the effective
conversion rate. During temperature measurements, the 1
×
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
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 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 Conguration
1
0
EN
SGL
ODD
A2
A1
A0
EN2
IM
FA
FB
SPD
CONVERTER CONFIGURATION
1
0
XXXXXXXXXX
Keep Previous
1
0
1
XXXXX
0
XXXX
Keep Previous
0
XXXXXXXXXX
Keep Previous
1
0
1
XXXXX
1
0
External Input (See Table 3)
50Hz/60Hz Rejection, 1x
1
0
1
XXXXX
1
0
1
0
External Input (See Table 3)
50Hz Rejection, 1x
1
0
1
XXXXX
1
0
1
0
External Input (See Table 3)
60Hz Rejection, 1x
1
0
1
XXXXX
1
0
1
External Input (See Table 3)
50Hz/60Hz Rejection, 2x
1
0
1
XXXXX
1
0
1
External Input (See Table 3)
50Hz Rejection, 2x
1
0
1
XXXXX
1
0
1
0
1
External Input (See Table 3)
60Hz Rejection, 2x
1
0
1
XXXXX
1
0
X
Measure Temperature
50Hz/60Hz Rejection, 1x
1
0
1
XXXXX
1
0
1
X
Measure Temperature
50Hz Rejection, 1x
1
0
1
XXXXX
1
0
X
Measure Temperature
60Hz Rejection, 1x
1
0
1
XXXXX
1
X
1
X
Reserved, Do Not Use
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