參數(shù)資料
型號(hào)： LTNN
廠商： Linear Technology Corporation
英文描述： 24-Bit No Latency ADC with Differential Input and Reference in MSOP
中文描述： 24位不具有差動(dòng)輸入和ADC的參考延遲，采用MSOP
文件頁(yè)數(shù)： 32/40頁(yè)
文件大小： 503K
代理商： LTNN
LTC2411/LTC2411-1
32
APPLICATIOU
W
U
U
INPUT FREQUENCY (Hz)
0
20
40
60
80
100
120
140
160
180
200
220
N
2411 F36
0
–20
–40
–60
–80
–100
–120
V
CC
= 5V
V
REF
= 5V
REF
–
= GND
V
INCM
= 2.5V
V
IN(P-P)
= 5V
F
O
= GND
T
A
= 25
°
C
MEASURED DATA
CALCULATED DATA
Figure 36. Input Normal Mode Rejection
vs Input Frequency (LTC2411-1)
Figure 37. Measured Input Normal Mode Rejection
vs Input Frequency (LTC2411)
Figure 38. Measured Input Normal Mode Rejection
vs Input Frequency (LTC2411)
up to 150% of full scale. In many industrial applications,
it is not uncommon to have to measure microvolt level
signals superimposed over volt level perturbations and
LTC2411/LTC2411-1 are eminently suited for such tasks.
When the perturbation is differential, the specification of
interest is the normal mode rejection for large input signal
levels. With a reference voltage V
REF
=5V, the LTC2411/
LTC2411-1 have a full-scale differential input range of 5V
peak-to-peak. Figures 37 and 38 show measurement re-
sults for the LTC2411 normal mode rejection ratio with a
7.5V peak-to-peak (150% of full scale) input signal super-
imposed over the more traditional nor
mal mode rejection
ratio results obtained with a 5V peak-to-peak (full scale)
input signal and Figure 39 shows the corresponding mea-
surement result for the LTC2411-1. It is clear that the
LTC2411/LTC2411-1 rejection performance is maintained
with no compromises in this extreme situation. When op-
erating with large input signal levels, the user must ob-
serve that such signals do not violate the device absolute
maximum ratings.
BRIDGE APPLICATIONS
Typical strain gauge based bridges deliver only 2mV/Volt
of excitation. As the maximum reference voltage of the
LTC2411/LTC2411-1 is 5V, remote sensing of applied
excitation without additional circuitry requires that excita-
tion be limited to 5V. This gives only 10mV full scale, which
can be resolved to 1 part in 5000 without averaging. For
many solid state sensors, this is comparable to the sensor.
INPUT FREQUENCY (Hz)
0
15 30 45 60 75 90 105 120 135 150 165 180 195 210 225 240
N
2411 F37
0
–20
–40
–60
–80
–100
–120
V
CC
= 5V
V
REF
= 5V
V
INCM
= 2.5V
F
O
= GND
T
A
= 25
°
C
V
IN(P-P)
= 5V
V
IN(P-P)
= 7.5V
(150% OF FULL SCALE)
Figure 39. Measured Input Normal Mode Rejection
vs Input Frequency (LTC2411-1)
INPUT FREQUENCY (Hz)
0
20
40
60
80
100
120
140
160
180
200
220
N
2411 F39
0
–20
–40
–60
–80
–100
–120
V
CC
= 5V
V
REF
= 5V
REF
–
= GND
V
INCM
= 2.5V
F
O
= GND
T
A
= 25
°
C
V
IN(P-P)
= 5V
V
IN(P-P)
= 7.5V
(150% OF FULL SCALE)
INPUT FREQUENCY (Hz)
0
N
2411 F38
0
–20
–40
–60
–80
–100
–120
V
CC
= 5V
V
REF
= 5V
V
INCM
= 2.5V
F
O
= 5V
T
A
= 25
°
C
V
IN(P-P)
= 5V
V
IN(P-P)
= 7.5V
(150% OF FULL SCALE)
25
50
75
100
125
150
175
200
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