Figure 25. +FS Error vs RSOURCE
參數(shù)資料
型號(hào): LTC2415IGN
廠商: Linear Technology
文件頁(yè)數(shù): 24/40頁(yè)
文件大小: 0K
描述: IC A/D CONV 24BIT MICRPWR 16SSOP
標(biāo)準(zhǔn)包裝: 100
位數(shù): 24
采樣率(每秒): 15
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(lèi)型: 表面貼裝
封裝/外殼: 16-SSOP(0.154",3.90mm 寬)
供應(yīng)商設(shè)備封裝: 16-SSOP
包裝: 管件
輸入數(shù)目和類(lèi)型: 1 個(gè)差分,雙極
LTC2415/LTC2415-1
30
sn2415 24151fs
APPLICATIO S I FOR ATIO
WU
U
Figure 25. +FS Error vs RSOURCE at REF+ or REF(Small CIN)
Figure 26. –FS Error vs RSOURCE at REF+ or REF(Small CIN)
Figure 27. +FS Error vs RSOURCE at REF+ and REF(Large CREF)
Figure 28. –FS Error vs RSOURCE at REF+ and REF(Large CREF)
RSOURCE ()
1
10
100
1k
10k
100k
+FS
ERROR
(ppm
OF
V
REF
)
2415 F25
0
–10
–20
–30
–40
–50
VCC = 5V
REF+ = 5V
REF = GND
IN+ = 5V
IN = 2.5V
FO = GND
TA = 25°C
CREF = 0.01F
CREF = 0.001F
CREF = 100pF
CREF = 0pF
RSOURCE ()
1
10
100
1k
10k
100k
FS
ERROR
(ppm
OF
V
REF
)
2415 F26
50
40
30
20
10
0
VCC = 5V
REF+ = 5V
REF = GND
IN+ = GND
IN = 2.5V
FO = GND
TA = 25°C
CREF = 0.01F
CREF = 0.001F
CREF = 100pF
CREF = 0pF
RSOURCE ()
0 100 200 300 400 500 600 700 800 900 1000
+
FS
ERROR
(ppm
OF
V
REF
)
2415 F27
0
–90
–180
–270
–360
–450
VCC = 5V
REF+ = 5V
REF= GND
IN+ = 3.75V
IN = 1.25V
FO = GND
TA = 25°C
CREF = 0.01F
CREF = 0.1F
CREF = 1F, 10F
RSOURCE ()
0 100 200 300 400 500 600 700 800 900 1000
FS
ERROR
(ppm
OF
V
REF
)
2415 F28
450
360
270
180
90
0
VCC = 5V
REF+ = 5V
REF= GND
IN+ = 1.25V
IN = 3.75V
FO = GND
TA = 25°C
CREF = 0.01F
CREF = 0.1F
CREF = 1F, 10F
Reference Current
In a similar fashion, the LTC2415/LTC2415-1 sample the
differential reference pins REF+ and REFtransferring
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 situa-
tions.
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 configurations.
Such capacitors will average the reference sampling charge
and the external source resistance will see a quasi con-
stant reference differential impedance. For the LTC2415,
when FO = LOW (internal oscillator and 60Hz notch), the
typical differential reference resistance is 1.3M
which
will generate a gain error of approximately 0.38ppm for
each ohm of source resistance driving REF+ or REF.
When FO = HIGH (internal oscillator and 50Hz notch), the
typical differential reference resistance is 1.56M
which
will generate a gain error of approximately 0.32ppm for
each ohm of source resistance driving REF+ or REF. For
the LTC2415-1, the typical differential reference resis-
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