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參數(shù)資料
| 型號： | LTC2489IDEPBF |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 16-Bit 2-/4-Channel ADC with Easy Drive Input Current Cancellation and I2C Interface |
| 中文描述： | 16位2-/4-Channel ADC，具有易于驅動的輸入電流取消和I2C接口 |
| 文件頁數(shù)： | 20/24頁 |
| 文件大?。?/td> | 341K |
| 代理商： | LTC2489IDEPBF |
LTC2489
20
2489f
by the user and can be made insignificantly short. When
operating with an external conversion clock (f
O
connected
to an external oscillator), the LTC2489 output data rate
can be increased. The duration of the conversion cycle is
41036/f
EOSC
. If f
EOSC
= 307.2kHz, the converter behaves
as if the internal oscillator is used.
An increase in f
EOSC
over the nominal 307.2kHz will trans-
late into a proportional increase in the maximum output
data rate (up to a maximum of 100sps). The increase in
output rate leads to degradation in offset, full-scale error,
and effective resolution as well as a shift in frequency
rejection.
A change in f
EOSC
results in a proportional change in the
internal notch position. This leads to reduced differential
mode rejection of line frequencies. The common mode
APPLICATIONS INFORMATION
rejection of line frequencies remains unchanged, thus fully
differential input signals with a high degree of symmetry
on both the IN
+
and IN
–
pins will continue to reject line
frequency noise.
An increase in f
EOSC
also increases the effective dynamic
input and reference current. External RC networks will
continue to have zero differential input current, but the
time required for complete settling (580ns for f
EOSC
=
307.2kHz) is reduced, proportionally.
Once the external oscillator frequency is increased above
1MHz (a more than 3X increase in output rate) the effective-
ness of internal auto calibration circuits begins to degrade.
This results in larger offset errors, full-scale errors, and
decreased resolution, as shown in Figures 19 to 26.
INPUT FREQUENCY (Hz)
0
12.5
25
37.5
50
62.5
75
87.5 100 112.5 125 137.5 150 162.5 175 187.5 200
N
2489 F17
0
–20
–40
–60
–80
–100
–120
V
CC
= 5V
V
REF
= 5V
V
IN(CM)
= 2.5V
V
IN(P-P)
= 5V
T
A
= 25
°
C
MEASURED DATA
CALCULATED DATA
INPUT FREQUENCY (Hz)
0
15
30
45
60
75
90
105 120 135 150 165 180 195 210 225 240
N
2489 F18
0
–20
–40
–60
–80
–100
–120
V
CC
= 5V
V
REF
= 5V
V
IN(CM)
= 2.5V
T
A
°
C
V
IN(P-P)
= 5V
V
= 7.5V
(150% OF FULL SCALE)
Figure 17. Input Normal Mode Rejection vs Input Frequency with
Input Perturbation of 100% (50Hz/60Hz Notch)
Figure 18. Measure Input Normal Mode Rejection vs Input
Frequency with Input Perturbation of 150% (60Hz Notch)
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