參數(shù)資料
型號: LTC2411-1CMS
廠商: LINEAR TECHNOLOGY CORP
元件分類: ADC
英文描述: 24-Bit No Latency ADC with Differential Input and Reference in MSOP
中文描述: 1-CH 24-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO10
封裝: PLASTIC, MSOP-10
文件頁數(shù): 26/40頁
文件大?。?/td> 503K
代理商: LTC2411-1CMS
LTC2411/LTC2411-1
26
REF
translates into about 0.45ppm additional INL error.
When F
O
= HIGH (internal oscillator and 50Hz notch),
every 100
of source resistance driving REF
+
or REF
translates into about 0.37ppm additional INL error. For the
LTC2411-1, when F
O
= LOW, every 100
of source
resistance driving REF
+
or REF
translates into about
0.41ppm additional INL error. When F
O
is driven by an
external oscillator with a frequency f
EOSC
, every 100
of
source resistance driving REF
+
or REF
translates into
about 2.91 10
–6
f
EOSC
ppm additional INL error. Fig-
ure19 shows the typical INL error due to the source
resistance driving the REF
+
or REF
pins when large C
REF
values are used. The effect of the source resistance on the
two reference pins is additive with respect to this INL error.
In general, matching of source impedance for the REF
+
and REF
pins does not help the gain or the INL error. The
APPLICATIOU
W
U
U
R
SOURCE
(
)
1
10
100
1k
10k
100k
R
)
2411 F17b
50
40
30
20
10
0
C
REF
=
0.01
μ
F
C
REF
=
0.001
μ
F
C
REF
=
100pF
C
REF
=
0pF
V
CC
= 5V
REF
= 5V
REF
= GND
IN
+
= 1.25V
IN
= 3.75V
F
O
= GND
T
A
= 25
°
C
R
SOURCE
(
)
0
+
R
)
0
–20
–40
–60
–80
–100
–120
–140
–160
800
2411 F18a
200
400
600
1000
700
100
300
500
900
V
CC
= 5V
REF
+
= 5V
REF
= GND
IN
+
= 3.75V
IN
= 1.25V
F
O
= GND
T
A
= 25
°
C
C
REF
= 0.01
μ
F
C
REF
= 1
μ
F
C
REF
= 0.1
μ
F
C
REF
= 10
μ
F
Figure 18a. +FS Error vs R
SOURCE
at REF
+
or REF
(Large C
IN
)
Figure 17b. –FS Error vs R
SOURCE
at REF
+
or REF
(Small C
IN
)
Figure 18b. –FS Error vs R
SOURCE
at REF
+
or REF
(Large C
IN
)
R
SOURCE
(
)
0
R
)
160
140
120
100
80
60
40
20
0
800
2411 F18b
200
400
600
1000
700
100
300
500
900
V
= 5V
REF
+
= 5V
REF
= GND
IN
+
= 1.25V
IN
= 3.75V
F
O
= GND
T
A
= 25
°
C
C
REF
= 0.01
μ
F
C
REF
= 1
μ
F
C
REF
= 0.1
μ
F
C
REF
= 10
μ
F
V
INDIF
/V
REFDIF
–0.5–0.4–0.3–0.2–0.1 0
0.1 0.2 0.3 0.4 0.5
I
R
)
10
9
6
4
2
0
–2
–4
–6
–8
–10
V
= 5V
REF
+
= 5V
REF
= GND
V
INCM
= 0.5 (IN
+
+ IN
) = 2.5V
F
O
= GND
C
REF
= 10
μ
F
T
A
= 25
°
C
R
SOURCE
= 2k
R
SOURCE
= 1k
R
SOURCE
= 500
2411 F19
Figure 19. INL vs Differential Input Voltage (V
IN
= IN
+
= IN
)
and Reference Source Resistance (R
SOURCE
at REF
+
and REF
)
for Large C
REF
Values (C
REF
1
μ
F)
R
SOURCE
(
)
1
10
100
1k
10k
100k
+
R
)
2411 F17a
0
–10
–20
–30
–40
–50
V
CC
= 5V
REF
= 5V
REF
= GND
IN
+
= 3.75V
IN
= 1.25V
F
O
= GND
T
A
= 25
°
C
C
REF
=
0.01
μ
F
C
REF
=
0.001
μ
F
C
REF
=
100pF
C
REF
=
0pF
Figure 17a. +FS Error vs R
SOURCE
at REF
+
or REF
(Small C
IN
)
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