參數(shù)資料
型號(hào)： LTC2415CGN
廠商： LINEAR TECHNOLOGY CORP
元件分類： ADC
英文描述： 24-Bit No Latency ADCs with Differential Input and Differential Reference
中文描述： 1-CH 24-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO16
封裝： 0.150 INCH, PLASTIC, SSOP-16
文件頁數(shù)： 30/40頁
文件大?。?/td> 605K
代理商： LTC2415CGN
LTC2415/LTC2415-1
30
sn2415 24151fs
APPLICATIU
W
U
U
Figure 25. +FS Error vs R
SOURCE
at REF
+
or REF
–
(Small C
IN
)
Figure 26. –FS Error vs R
SOURCE
at REF
+
or REF
–
(Small C
IN
)
Figure 27. +FS Error vs R
SOURCE
at REF
+
and REF
–
(Large C
REF
)
Figure 28. –FS Error vs R
SOURCE
at REF
+
and REF
–
(Large C
)
R
SOURCE
(
)
1
10
100
1k
10k
100k
+
R
)
2415 F25
0
–10
–20
–30
–40
–50
V
= 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
–
R
)
2415 F26
50
40
30
20
10
0
V
CC
= 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
+
R
)
2415 F27
0
–90
–180
–270
–360
–450
V
= 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
–
R
)
2415 F28
450
360
270
180
90
0
V
CC
= 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
Reference Current
In a similar fashion, the LTC2415/LTC2415-1 sample the
differential reference pins REF
+
and REF
–
transferring
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 (C
REF
< 0.01
μ
F), 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 C
REF
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 (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. For the LTC2415,
when F
O
= 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 F
O
= 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-
相關(guān)PDF資料
PDF描述
LTC2415IGN 24-Bit No Latency ADCs with Differential Input and Differential Reference
LTC2415 2-Channel Differential Input 24-Bit No Latency DS ADC
LTC2424 16-Bit 2.5-V to 3.3-V/3.3-V To 5-V Level Shifting Transceiver With 3-State Outputs 48-SSOP -40 to 85
LTC2424C 16-Bit 2.5-V to 3.3-V/3.3-V To 5-V Level Shifting Transceiver With 3-State Outputs 54-BGA MICROSTAR JUNIOR -40 to 85
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