參數(shù)資料
型號: LTC2420
廠商: Linear Technology Corporation
英文描述: Micropower 20-bit ADC(微功耗,20位串行模數(shù)轉(zhuǎn)換器)
中文描述: 微功耗20位ADC(微功耗,20位串行模數(shù)轉(zhuǎn)換器)
文件頁數(shù): 25/36頁
文件大?。?/td> 388K
代理商: LTC2420
25
LTC2420
APPLICATIU
W
U
U
node V
REF
is small (C
VREF
< 0.01
μ
F), the reference input
can tolerate large external resistances without reduction
in INL, see Figure 25. If the external capacitance is large
(C
VREF
> 0.01
μ
F), the linearity will be degraded by
0.015ppm/
independent of capacitance at V
REF
, see
Figure 26.
In addition to the dynamic reference current, the V
REF
ESD
protection diodes have a temperature dependent leakage
current. This leakage current, nominally 1nA (
±
10nA max),
results in a fixed full-scale shift of 10
μ
V for a 10k source
resistance.
ANTIALIASING
One of the advantages delta-sigma ADCs offer over con-
ventional ADCs is on-chip digital filtering. Combined with
a large oversampling ratio, the LTC2420 significantly
simplifies antialiasing filter requirements.
The digital filter provides very high rejection except at
integer multiples of the modulator sampling frequency
(f
S
), see Figure 27. The modulator sampling frequency is
256 F
O
, where F
O
is the notch frequency (typically 50Hz
or 60Hz). The bandwidth of signals not rejected by the
digital filter is narrow (
0.2%) compared to the bandwidth
of the frequencies rejected.
RESISTANCE AT V
REF
(
)
0
40
50
60
600
800
2420 F23
30
20
200
400
1000
10
0
–10
F
C
VREF
= 22
μ
F
C
VREF
= 10
μ
F
C
VREF
= 1
μ
F
C
VREF
= 0.1
μ
F
C
VREF
= 0.01
μ
F
C
VREF
= 0.001
μ
F
V
CC
= 5V
V
REF
= 5V
V
IN
= 5V
T
A
= 25
°
C
RESISTANCE AT V
REF
(
)
1
300
400
500
1k
10k
2420 F24
200
100
10
100
100k
0
–100
–200
V
V
CC
= 5V
V
REF
= 5V
V
IN
= 5V
T
A
= 25
°
C
C
VREF
= 0.01
μ
F
C
VREF
= 100pF
C
VREF
= 1000pF
C
VREF
= 0pF
RESISTANCE AT V
REF
(
)
1
30
40
50
1k
10k
2420 F25
20
10
10
100
100k
0
–10
–20
I
V
CC
= 5V
V
REF
= 5V
T
A
= 25
°
C
C
VREF
= 0.01
μ
F
C
VREF
= 1000pF
C
VREF
= 0pF
C
VREF
= 100pF
RESISTANCE AT V
REF
(
)
0
6
8
10
600
800
2420 F26
4
2
–2
–4
–6
–8
–10
200
400
1000
0
I
C
VREF
= 22
μ
F
C
VREF
= 10
μ
F
C
VREF
= 1
μ
F
C
VREF
= 0.1
μ
F
C
VREF
= 0.01
μ
F
C
VREF
= 0.001
μ
F
V
CC
= 5V
V
REF
= 5V
T
A
= 25
°
C
Figure 23. Full-Scale Error vs R
VREF
(Large C)
Figure 24. Full-Scale Error vs R
VREF
(Small C)
Figure 25. INL Error vs R
VREF
(Small C)
Figure 26. INL Error vs R
VREF
(Large C)
相關(guān)PDF資料
PDF描述
LTC2435IGN 20-Bit No Latency ADCs with Differential Input and Differential Reference
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