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LTC2494
2494fd
applications inForMation
INPUT DATA FORMAT
The LTC2494 serial input word is 16 bits long and contains
two distinct sets of data. The first set (SGL, ODD, A2, A1,
A0) is used to select the input channel. The second set of
data (IM, FA, FB, SPD, GS2, GS1, GS0) is used to select
the frequency rejection, speed mode (1x, 2x), temperature
measurement and gain.
After power-up, the device initiates an internal reset cycle
whichsetstheinputchanneltoCH0–CH1(IN+=CH0,IN–=
CH1),thefrequencyrejectiontosimultaneous50Hz/60Hz,
1xoutputrate(auto-calibrationenabled),andgain=1.The
firstconversionautomaticallybeginsatpower-upusingthis
default configuration. Once the conversion is complete, a
new word may be written into the device.
The first three bits shifted into the device consist of two
preamble bits and an enable bit. These bits are used to
enable the device configuration and input channel selec-
tion. Valid settings for these three bits are 000, 100 and
101. Other combinations should be avoided. If the first
three bits are 000 or 100, the following data is ignored
(don’t care) and the previously selected input channel and
configuration remain valid for the next conversion.
If the first three bits shifted into the device are 101, then
the next five bits select the input channel for the next
conversion cycle (see Table 3).
The first input bit following the 101 sequence (SGL) de-
termines if the input selection is differential (SGL = 0) or
single-ended(SGL=1).ForSGL=0,twoadjacentchannels
canbeselectedtoformadifferentialinput.ForSGL=1,one
of16channelsisselectedasthepositiveinput.Thenegative
inputisCOMforallsingle-endedoperations.Theremaining
4bits(ODD,A2,A1,A0)determinewhichchannel(s)is/are
selected and the polarity (for a differential input).
The next serial input bit immediately following the input
channel selection is the enable bit for the conversion
configuration (EN2). If this bit is set to 0, then the next
conversion is performed using the previously selected
converter configuration. This is useful in systems using
the same rejection/speed for all input channels and for
backwardcompatibilitywiththeLTC2418/LTC2414families
of delta-sigma ADCs.
The second set of configuration data can be loaded into the
device by setting EN2 = 1 (see Table 4). The first bit (IM)
is used to select the internal temperature sensor. If IM = 1,
the following conversion will be performed on the internal
temperaturesensorratherthantheselectedinputchannel.
The next 2 bits (FA and FB) are used to set the rejection
frequency. The next bit (SPD) is used to select either the
1x output rate if SPD = 0 (auto-calibration is enabled and
the offset is continuously calibrated and removed from
the final conversion result) or the 2x output rate if SPD
Table 2. LTC2494 Output Data Format
DIFFERENTIAL INPUT VOLTAGE
VIN*
BIT 23
EOC
BIT 22
DMY
BIT 21
SIG
BIT 20
MSB
BIT 19
BIT 18
BIT 17
…
BIT 4
BITS 3 TO 0
VIN* ≥ FS**
0
1
0
…
0
0000
FS** – 1LSB
0
1
0
1
…
1
0000
0.5 FS**
0
1
0
1
0
…
0
0000
0.5 FS** – 1LSB
0
1
0
1
…
1
0000
0
1/0***
0
…
0
0000
–1LSB
0
1
…
1
0000
–0.5 FS**
0
1
0
…
0
0000
–0.5 FS** – 1LSB
0
1
0
1
…
1
0000
–FS**
0
1
0
…
0
0000
VIN* < –FS**
0
1
…
1
0000
*The differential input voltage VIN = IN+ – IN–. **The full-scale voltage FS = 0.5 VREF/Gain.
***The sign bit changes state during the 0 output code when the device is operating in the 2x speed mode.
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