參數(shù)資料
型號： DC1010A-C
廠商： Linear Technology
文件頁數(shù)： 10/32頁
文件大?。?/td> 0K
描述： BOARD DELTA SIGMA ADC LTC2487
軟件下載： QuikEval System
設(shè)計(jì)資源： DC1010A Design File
DC1010A Schematic
標(biāo)準(zhǔn)包裝： 1
系列： Easy Drive™, QuikEval™
ADC 的數(shù)量： 1
位數(shù)： 16
采樣率（每秒）： 15
數(shù)據(jù)接口： I²C，串行
已用 IC / 零件： LTC2487
已供物品： 板
相關(guān)產(chǎn)品： LTC2487IDE#TRPBF-ND - IC ADC 16BIT DELTA SIG 14-DFN
LTC2487CDE#TRPBF-ND - IC ADC 16BIT DELTA SIG 14-DFN
LTC2487CDE#PBF-ND - IC ADC 16BIT DELTA SIG 14-DFN
LTC2487IDE#PBF-ND - IC ADC 16BIT DELTA SIG 14-DFN
LTC2487
18
2487fd
The conguration remains valid until a new input word
with EN = 1 (the rst three bits are 101 for the rst word)
and EN2 = 1 (for the second write byte) is shifted into
the device.
Rejection Mode (FA, FB)
The LTC2487 includes a high accuracy on-chip oscillator
with no required external components. Coupled with an
integrated fourth order digital low pass lter, the LTC2487
rejects line frequency noise. In the default mode, the
LTC2487 simultaneously rejects 50Hz and 60Hz by at least
87dB. If more rejection is required, the LTC2487 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 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, easing system over-
head and increasing the effective conversion rate. During
temperature measurements, the 1x mode is always used
independent of the value of SPD.
GAIN (GS2, GS1, GS0)
The input referred gain of the LTC2487 is adjustable
from 1 to 256 (see Tables 5a and 5b). With a gain of 1,
the differential input range is ±VREF/2 and the common
mode input range is rail-to-rail. As the gain is increased,
the differential input range is reduced to ±0.5 VREF/Gain
but the common mode input range remains rail-to-rail.
As the differential gain is increased, low level voltages
are digitized with greater resolution. At a gain of 256, the
LTC2487 digitizes an input signal range of ±9.76mV with
over 16,000 counts.
Temperature Sensor
The LTC2487 includes an integrated temperature sen-
sor. The temperature sensor is selected by setting
IM = 1. 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.
APPLICATIONS INFORMATION
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
μV
Noise Free Resolution*
65536
32768
16384
Counts
Gain Error
5
8
ppm of FS
Offset Error
0.5
μV
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
μV
Noise Free Resolution*
65536
45875
22937
Counts
Gain Error
5
ppm of FS
Offset Error
200
μV
*The resolution in counts is calculated as the FS divided by LSB or the RMS noise value, whichever is larger.
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