參數(shù)資料
型號(hào)： LTC2489
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(qū)動(dòng)的輸入電流取消和I2C接口
文件頁(yè)數(shù)： 18/24頁(yè)
文件大小： 341K
代理商： LTC2489
LTC2489
18
2489f
In cases where large bypass capacitors are required on
the reference inputs (C
REF
> .01μF), full-scale and linear-
ity errors are proportional to the value of the reference
resistance. Every ohm of reference resistance produces
a full-scale error of approximately 0.5ppm (while operat-
ing with the internal oscillator) (see Figures 12 and 13). If
the input common mode voltage is equal to the reference
common mode voltage, a linearity error of approximately
0.67ppm per 100
Ω
of reference resistance results (see
Figure 14). 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
Ω
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
Ω
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 LTC2489 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
Figure 14. INL vs Differential Input Voltage and
Reference Source Resistance for C
REF
> 1μF
V
IN
/V
REF
–0.5
I
R
)
2
6
10
0.3
2489 F14
–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
Ω
R = 500
Ω
Figure 12. +FS Error vs R
SOURCE
at V
REF
(Large C
REF
)
Figure 13. –FS Error vs R
SOURCE
at V
REF
(Large C
REF
)
R
SOURCE
(
Ω
)
0
+
300
400
500
800
2489 F12
200
100
0
200
400
600
1000
V
CC
= 5V
V
= 5V
V
REF
= 3.75V
V
IN–
= 1.25V
F
O
= GND
T
A
= 25
°
C
C
REF
= 1
μ
F, 10
μ
F
C
REF
= 0.1
μ
F
C
REF
= 0.01
μ
F
R
SOURCE
(
Ω
)
0
–
–200
–100
0
800
2489 F13
–300
–400
–500
200
400
600
1000
V
CC
= 5V
V
= 5V
V
REF
= 1.25V
V
IN–
= 3.75V
F
O
= GND
T
A
= 25
°
C
C
REF
= 1
μ
F, 10
μ
F
C
REF
= 0.1
μ
F
C
REF
= 0.01
μ
F
相關(guān)PDF資料
PDF描述
LTC2489CDEPBF 16-Bit 2-/4-Channel ADC with Easy Drive Input Current Cancellation and I2C Interface
LTC2489CDETRPBF 16-Bit 2-/4-Channel ADC with Easy Drive Input Current Cancellation and I2C Interface
LTC2489IDEPBF 16-Bit 2-/4-Channel ADC with Easy Drive Input Current Cancellation and I2C Interface
LTC2493 24-Bit 2-/4-Channel ADC with Easy Drive Input Current Cancellation and I2C Interface
LTC2493CDEPBF 24-Bit 2-/4-Channel ADC with Easy Drive Input Current Cancellation and I2C Interface
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