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參數(shù)資料
| 型號： | 2495 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 16-Bit 8-/16-Channel ツヒ ADC with PGA, Easy Drive and I2C Interface |
| 中文描述： | 16位8-/16-ChannelツヒADC，帶PGA巡回賽，輕松驅(qū)動和I2C接口 |
| 文件頁數(shù)： | 26/32頁 |
| 文件大?。?/td> | 558K |
| 代理商： | 2495 |
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LTC2495
26
2495f
Figure 17. INL vs Differential Input
Voltage and Reference Source
Resistance for C
REF
> 1μF
Figure 19. Input Normal Mode Rejection, Internal
Oscillator and 60Hz Rejection Mode
Figure 18. Input Normal Mode Rejection, Internal
Oscillator and 50Hz Rejection Mode
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 LTC2495 significantly
simplifies antialiasing filter requirements. Additionally,
the input current cancellation feature allows external low
pass filtering without degrading the DC performance of
the device.
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
18 and 19). 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
.
When using the internal oscillator, the LTC2495 is designed
to reject line frequencies. As shown in Figure 20, rejec-
tion nulls occur at multiples of frequency f
N
, where f
N
is
determined by the input control bits FA and FB (f
N
= 50Hz
or 60Hz or 55Hz for simultaneous rejection). Multiples of
the modulator sampling rate (f
S
= f
N
256) only reject noise
to 15dB (see Figure 21); if noise sources are present at
these frequencies antialiasing will reduce their effects.
The user can expect to achieve this level of performance
using the internal oscillator, as shown in Figures 22, 23,
and 24. Measured values of normal mode rejection are
APPLICATIONS INFORMATION
Figure 15. +FS Error vs R
SOURCE
at V
REF
(Large C
REF
)
Figure 16. –FS Error vs R
SOURCE
at V
REF
(Large C
REF
)
R
SOURCE
(
)
0
+
300
400
500
800
2495 F15
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
(
)
0
–
–200
–100
0
800
2495 F16
–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
V
IN
/V
REF
–0.5
I
R
)
2
6
10
0.3
2495 F17
–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
2495 F18
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
0
f
S
I
2495 F19
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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