參數(shù)資料
型號(hào)： DC571A
廠商： Linear Technology
文件頁(yè)數(shù)： 25/48頁(yè)
文件大?。?/td> 0K
描述： BOARD DELTA SIGMA ADC LTC2418
軟件下載： QuikEval System
設(shè)計(jì)資源： DC571A Design File
DC571A Schematic
標(biāo)準(zhǔn)包裝： 1
系列： QuikEval™
ADC 的數(shù)量： 1
位數(shù)： 24
采樣率（每秒）： 7.5
數(shù)據(jù)接口： MICROWIRE?，串行，SPI?
工作溫度： 0°C ~ 70°C
已用 IC / 零件： LTC2418
已供物品： 板
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LTC2414/LTC2418
31
241418fa
mode rejection and by carefully eliminating common
mode to differential mode conversion sources in the input
circuit. The user should avoid single-ended input filters
and should maintain a very high degree of matching and
symmetry in the circuits driving the IN+ and IN– pins.
Second, the increase in clock frequency will increase
proportionally the amount of sampling charge transferred
through the input and the reference pins. If large external
input and/or reference capacitors (CIN, CREF) are used, the
previous section provides formulae for evaluating the
effect of the source resistance upon the converter perfor-
mance for any value of fEOSC. If small external input and/
or reference capacitors (CIN, CREF) are used, the effect of
the external source resistance upon the LTC2414/LTC2418
typical performance can be inferred from Figures 12, 13,
18 and 19 in which the horizontal axis is scaled by 153600/
fEOSC.
Third, an increase in the frequency of the external oscilla-
tor above 460800Hz (a more than 3
× increase in the
output data rate) will start to decrease the effectiveness of
the internal autocalibration circuits. This will result in a
progressive degradation in the converter accuracy and
linearity. Typical measured performance curves for output
data rates up to 100 readings per second are shown in
Figures 23, 24, 25, 26, 27, 28, 29 and 30. In order to obtain
the highest possible level of accuracy from this converter
at output data rates above 20 readings per second, the
user is advised to maximize the power supply voltage used
and to limit the maximum ambient operating temperature.
In certain circumstances, a reduction of the differential
reference voltage may be beneficial.
Input Bandwidth
The combined effect of the internal Sinc4 digital filter and
of the analog and digital autocalibration circuits deter-
mines the LTC2414/LTC2418 input bandwidth. When the
internal oscillator is used with the notch set at 60Hz
(FO = LOW), the 3dB input bandwidth is 3.63Hz. When the
internal oscillator is used with the notch set at 50Hz
(FO = HIGH), the 3dB input bandwidth is 3.02Hz. If an
external conversion clock generator of frequency fEOSC is
connected to the FO pin, the 3dB input bandwidth is 0.236
10–6 fEOSC.
APPLICATIO S I FOR ATIO
WU
UU
OUTPUT DATA RATE (READINGS/SEC)
200
160
120
80
40
0
–40
–80
–120
–160
–200
OFFSET
ERROR
(ppm
of
V
ERROR
)
2414/18 F23
0
102030 40
50 60 70
80 90 100
TA = 25°C
TA = 85°C
VCC = 5V
VREF = 5V
VIN = 2.5V
VINCM = 2.5V
SDI = GND
FO = EXTERNAL OSCILLATOR
OUTPUT DATA RATE (READINGS/SEC)
0
+FS
ERROR
(ppm
of
V
REF
)
2000
0
–2000
–4000
–6000
–8000
–10000
–12000
2414/18 F24
20
100
90
80
70
60
50
10
30 40
TA = 25°C
TA = 85°C
VCC = 5V
VREF = 5V
VIN = 2.5V
VINCM = 2.5V
SDI = GND
FO = EXTERNAL OSCILLATOR
OUTPUT DATA RATE (READINGS/SEC)
0
–
FS
ERROR
(ppm
of
V
REF
)
12000
10000
8000
6000
4000
2000
0
–2000
2414/18 F25
20
100
90
80
70
60
50
10
30 40
TA = 25°C
TA = 85°C
VCC = 5V
VREF = 5V
VIN = 2.5V
VINCM = 2.5V
SDI = GND
FO = EXTERNAL OSCILLATOR
Figure 23. Offset Error vs Output Data Rate and Temperature
Figure 24. +FS Error vs Output Data Rate and Temperature
Figure 25. –FS Error vs Output Data Rate and Temperature
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