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參數(shù)資料
| 型號(hào)： | LTC2436-1CGN |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類(lèi)： | ADC |
| 英文描述： | 2-Channel Differential Input 16-Bit No Latency DS ADC |
| 中文描述： | 2-CH 16-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO16 |
| 封裝： | 0.150 INCH, PLASTIC, SSOP-16 |
| 文件頁(yè)數(shù)： | 23/28頁(yè) |
| 文件大小： | 292K |
| 代理商： | LTC2436-1CGN |
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LTC2436-1
23
24361f
Larger values of reference capacitors (C
REF
> 0.01
μ
F) 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. When F
O
= LOW
(internal oscillator and 50Hz/60Hz notch), the typical
differential reference resistance is 1.4M
which will gen-
erate a gain error of approximately 1LSB full scale for each
40
of source resistance driving REF
+
or REF
–
. When F
O
is driven by an external oscillator with a frequency f
EOSC
(external conversion clock operation), the typical differen-
tial reference resistance is 0.20 10
12
/f
EOSC
and each
ohm of source resistance drving REF
+
or REF
–
will result
in 1.54 10
–7
f
EOSC
LSB gain error at full scale. The effect
APPLICATIOU
W
U
U
Figure 19. +FS Error vs R
SOURCE
at REF
+
or REF
–
(Small C
IN
)
Figure 20. –FS Error vs R
SOURCE
at REF
+
or REF
–
(Small C
IN
)
Figure 21. +FS Error vs R
SOURCE
at REF
+
and REF
–
(Large C
REF
)
Figure 22. –FS Error vs R
SOURCE
at REF
+
and REF
–
(Large C
REF
)
R
SOURCE
(
)
1
10
100
1k
10k
100k
+
24361 F19
0
–3
–2
–1
V
CC
= 5V
REF
= 5V
REF
–
= GND
IN
+
= 5V
IN
–
= 2.5V
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
R
SOURCE
(
)
1
10
100
1k
10k
100k
–
2412 F19
3
0
1
2
V
= 5V
REF
+
= 5V
REF
–
= GND
IN
+
= GND
IN
–
= 2.5V
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
R
SOURCE
(
)
0 100 200 300 400 500 600 700 800 9001000
+
24361 F21
0
6
11
17
22
30
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
= 0.1
μ
F
C
REF
= 1
μ
F, 10
μ
F
R
SOURCE
(
)
0 100 200 300 400 500 600 700 800 9001000
–
24361 F22
30
22
17
11
6
0
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
= 0.1
μ
F
C
REF
= 1
μ
F, 10
μ
F
of the source resistance on the two reference pins is
additive with respect to this gain error. The typical +FS and
–FS errors for various combinations of source resistance
seen by the REF
+
and REF
–
pins and external capacitance
C
REF
connected to these pins are shown in Figures 19, 20,
21 and22.
In addition to this gain error, the converter INL perfor-
mance is degraded by the reference source impedance.
When F
O
= LOW (internal oscillator and 50Hz/60Hz notch),
every 1000
of source resistance driving REF
+
or REF
–
translates into about 1LSB 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
–
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