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參數(shù)資料
| 型號： | LTC2431IMS#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 18/40頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 20BIT DIFFINPUT/REF10MSOP |
| 標準包裝： | 2,500 |
| 位數(shù)： | 20 |
| 采樣率（每秒）： | 7.5 |
| 數(shù)據(jù)接口： | MICROWIRE?，串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 2 |
| 功率耗散（最大）： | 1mW |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 10-TFSOP，10-MSOP（0.118"，3.00mm 寬） |
| 供應商設(shè)備封裝： | 10-MSOP |
| 包裝： | 帶卷 (TR) |
| 輸入數(shù)目和類型： | 1 個差分，雙極 |
| 配用： | DC586A-ND - BOARD DELTA SIGMA ADC LTC2431 |
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LTC2430/LTC2431
25
24301f
a specification can also be easily achieved by an external
clock. When relatively stable resistors (50ppm/
°C) are
used for the external source impedance seen by IN+ and
IN–, the expected drift of the dynamic current, offset and
gain errors will be insignificant (about 1% of their respec-
tive values over the entire temperature and voltage range).
Even for the most stringent applications, a one-time
calibration operation may be sufficient.
In addition to the input sampling charge, the input ESD
protection diodes have a temperature dependent leakage
current. This current, nominally 1nA (
±10nA max), results
in a small offset shift. A 100
source resistance will create
a 0.1
V typical and 1V maximum offset voltage.
Reference Current
In a similar fashion, the LTC2430 or LTC2431 samples the
differential reference pins REF+ and REF– transfering small
amount of charge to and from the external driving circuits
thus producing a dynamic reference current. This current
does not change the converter offset, but it may degrade
the gain and INL performance. The effect of this current
can be analyzed in the same two distinct situations.
For relatively small values of the external reference capaci-
tors (CREF < 0.01F), the voltage on the sampling capacitor
settles almost completely and relatively large values for
the source impedance result in only small errors. Such
values for CREF will deteriorate the converter offset and
gain performance without significant benefits of reference
filtering and the user is advised to avoid them.
Larger values of reference capacitors (CREF > 0.01F)
may be required as reference filters in certain configura-
tions. Such capacitors will average the reference sam-
pling charge and the external source resistance will see a
quasi constant reference differential impedance. When
FO = LOW (internal oscillator and 60Hz notch), the typical
differential reference resistance is 15.6M
which will
generate a gain error of approximately 0.032ppm for each
ohm of source resistance driving REF+ or REF–. When FO
= HIGH (internal oscillator and 50Hz notch), the typical
differential reference resistance is 18.7M
which will
generate a gain error of approximately 0.027ppm for each
ohm of source resistance driving REF+ or REF –. When FO
is driven by an external oscillator with a frequency fEOSC
(external conversion clock operation), the typical differ-
ential reference resistance is 2.4 1012/fEOSC and each
ohm of source resistance drving REF+ or REF– will result
in 0.206 10–6 fEOSCppm gain error. The effect of the
source resistance on the two reference pins is additive
with respect to this gain error. The typical FS errors for
various combinations of source resistance seen by the
REF+ and REF– pins and external capacitance CREF con-
nected to these pins are shown in Figures 17 and 18.
Typical – FS errors are similar to + FS errors with opposite
polarity.
In addition to this gain error, the converter INL perfor-
mance is degraded by the reference source impedance.
When FO = LOW (internal oscillator and 60Hz notch), every
100
of source resistance driving REF+ or REF– translates
APPLICATIO S I FOR ATIO
WU
UU
Figure 17b. – FS Error vs RSOURCE at REF+ or REF– (Small CIN)
Figure 17a. +FS Error vs RSOURCE at REF+ or REF– (Small CIN)
RSOURCE ()
1
–50
+FS
ERROR
(ppm)
–40
–30
–20
–10
0
10
100
1k
10k
2431 F17a
100k
VCC = 5V
VREF+ = 5V
VREF– = GND
VIN+ = 3.75V
VIN– = 1.25V
FO = GND
TA = 25°C
CREF = 0.01F
CREF = 0pF
CREF = 0.001F
CREF = 100pF
RSOURCE ()
1
–10
–
FS
ERROR
(ppm)
0
10
20
30
40
50
10
100
1k
10k
2431 F17b
100k
VCC = 5V
VREF+ = 5V
VREF– = GND
VIN+ = 1.25V
VIN– = 3.75V
FO = GND
TA = 25°C
CREF = 0.01F
CREF = 0pF
CREF = 0.001F
CREF = 100pF
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