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參數(shù)資料
| 型號(hào)： | LTC2493IDETRPBF |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 24-Bit 2-/4-Channel ADC with Easy Drive Input Current Cancellation and I2C Interface |
| 中文描述： | 24位2-/4-Channel ADC，具有易于驅(qū)動(dòng)的輸入電流取消和I2C接口 |
| 文件頁(yè)數(shù)： | 25/32頁(yè) |
| 文件大小： | 588K |
| 代理商： | LTC2493IDETRPBF |
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LTC2493
2493fa
The SINC
4
digital filter provides excellent normal mode
rejection at all frequencies except DC and integer multiples
of the modulator sampling frequency (f
S
) (see Figures
17 and 18). The modulator sampling frequency is f
S
=
15,360Hz while operating with its internal oscillator and
f
S
= f
EOSC
/20 when operating with an external oscillator
of frequency f
EOSC
.
Figure 16. INL vs Differential Input Voltage and
Reference Source Resistance for C
REF
> 1μF
Figure 18. Input Normal Mode Rejection, Internal
Oscillator and 60Hz Rejection Mode
Figure 17. Input Normal Mode Rejection, Internal
Oscillator and 50Hz Rejection Mode
the reference common mode voltage, a linearity error of
approximately 0.67ppm per 100
W
of reference resistance
results (see Figure 16). In applications where the input
and reference common mode voltages are different, the
errors increase. A 1V difference in between common mode
input and common mode reference results in a 6.7ppm
INL error for every 100
W
of reference resistance.
In addition to the reference sampling charge, the reference
ESD protection diodes have a temperature dependent leak-
age current. This leakage current, nominally 1nA (±10nA
max) results in a small gain error. A 100
W
reference
resistance will create a 0.5μV full-scale error.
Normal Mode Rejection and Antialiasing
One of the advantages delta-sigma ADCs offer over
conventional ADCs is on-chip digital filtering. Combined
with a large oversample ratio, the LTC2493 significantly
simplifies antialiasing filter requirements. Additionally,
the input current cancellation feature allows external low
pass filtering without degrading the DC performance of
the device.
applicaTions inForMaTion
V
IN
/V
REF
–0.5
I
R
)
2
6
10
0.3
2493 F16
–2
–6
0
4
8
–4
–8
–10
–0.3
–0.1
0.1
0.5
V
CC
= 5V
V
REF
= 5V
V
IN(CM)
= 2.5V
T
A
°
C
C
REF
= 10
μ
F
R = 1k
R = 100
R = 500
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
0
f
S
2f
S
3f
S
4f
S
5f
S
6f
S
7f
S
8f
S
9f
S
10f
S
11f
S
12f
S
I
2493 F17
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
0
f
S
I
2493 F18
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
2f
S
3f
S
4f
S
5f
S
6f
S
7f
S
8f
S
9f
S
10f
S
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