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參數(shù)資料
| 型號： | DC955A |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 10/34頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD DELTA SIGMA ADC LTC2483 |
| 軟件下載： | QuikEval System |
| 設(shè)計資源： | DC955A Design File DC955A 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）： | 6.8 |
| 數(shù)據(jù)接口： | I²C，串行 |
| 工作溫度： | 0°C ~ 70°C |
| 已用 IC / 零件： | LTC2483 |
| 已供物品： | 板 |
| 相關(guān)產(chǎn)品： | LTC2483IDD#TRPBF-ND - IC ADC 16BIT I2C 10-DFN LTC2483CDD#TRPBF-ND - IC ADC 16BIT I2C 10-DFN LTC2483IDD#PBF-ND - IC ADC 16BIT I2C 10-DFN LTC2483CDD#PBF-ND - IC ADC 16BIT I2C 10-DFN |
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LTC2483
2483fc
input signal with better than 1ppm accuracy if the sampling
period is at least 14 times greater than the input circuit time
constant
τ. The sampling process on the four input analog
pins is quasi-independent so each time constant should be
considered by itself and, under worst-case circumstances,
the errors may add.
Whenusingtheinternaloscillator,theLTC2483’sfront-end
switched-capacitor network is clocked at 123kHz corre-
sponding to an 8.1s sampling period. Thus, for settling
errors of less than 1ppm, the driving source impedance
should be chosen such that
τ≤8.1s/14=580ns.Whenan
externaloscillatoroffrequencyfEOSCisused,thesampling
period is 2.5/fEOSC and, for a settling error of less than
1ppm,
τ ≤ 0.178/fEOSC.
Automatic Differential Input Current Cancellation
In applications where the sensor output impedance is
low (up to 10kΩ with no external bypass capacitor or up
to 500Ω with 0.001F bypass), complete settling of the
input occurs. In this case, no errors are introduced and
direct digitization of the sensor is possible.
For many applications, the sensor output impedance
combined with external bypass capacitors produces RC
time constants much greater than the 580ns required for
1ppm accuracy. For example, a 10kΩ bridge driving a
0.1F bypass capacitor has a time constant an order of
magnitudegreaterthantherequiredmaximum.Historically,
settlingissuesweresolvedusingbuffers.Thesebuffersled
to increased noise, reduced DC performance (offset/drift),
limited input/output swing (cannot digitize signals near
ground or VCC), added system cost and increased power.
The LTC2483 uses a proprietary switching algorithm that
forces the average differential input current to zero inde-
pendent of external settling errors. This allows accurate
direct digitization of high impedance sensors without the
need of buffers (see Figures 8 to 10). Additional errors
resulting from mismatched leakage currents must also
be taken into account.
The switching algorithm forces the average input current
on the positive input (IIN+) to be equal to the average input
current on the negative input (IIN–). Over the complete
conversion cycle, the average differential input current
(IIN+ – IIN–) is zero. While the differential input current
applicaTions inFormaTion
CEXT
2483 F08
VINCM + 0.5VIN
RSOURCE
IN+
LTC2483
CPAR
20pF
CEXT
VINCM – 0.5VIN
RSOURCE
IN–
CPAR
20pF
Figure 8. An RC Network at IN+ and IN–
Figure 9. +FS Error vs RSOURCE at IN+ and IN–
Figure 10. –FS Error vs RSOURCE at IN+ and IN–
R()
1
+FS
ERROR
(ppm)
–20
0
20
1k
100k
2483 F09
–40
–60
–80
10
100
10k
40
60
80
VCC = 5V
VREF = 5V
VIN+ = 3.75V
VIN– = 1.25V
TA = 25°C
CEXT = 0pF
CEXT = 100pF
CEXT = 1nF, 0.1F, 1F
RSOURCE ()
1
–FS
ERROR
(ppm)
–20
0
20
1k
100k
2483 F10
–40
–60
–80
10
100
10k
40
60
80
VCC = 5V
VREF = 5V
VIN+ = 1.25V
VIN– = 3.75V
TA = 25°C
CEXT = 0pF
CEXT = 100pF
CEXT = 1nF, 0.1F, 1F
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