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參數(shù)資料
| 型號(hào)： | LTC2495IUHF#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | 16-CH 16-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PQCC38 |
| 封裝： | 5 X 7 MM, PLASTIC, MO-220WKHD, QFN-38 |
| 文件頁(yè)數(shù)： | 19/32頁(yè) |
| 文件大?。?/td> | 619K |
| 代理商： | LTC2495IUHF#TR |
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LTC2495
2495fa
Figure 17. INL vs Differential Input
Voltage and Reference Source
Resistance for CREF > 1F
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 SINC4 digital filter provides excellent normal mode
rejection at all frequencies except DC and integer multiples
of the modulator sampling frequency (fS) (see Figures
18 and 19). The modulator sampling frequency is fS =
15,360Hz while operating with its internal oscillator and
fS = fEOSC/20 when operating with an external oscillator
of frequency fEOSC.
Whenusingtheinternaloscillator,theLTC2495isdesigned
to reject line frequencies. As shown in Figure 20, rejec-
tion nulls occur at multiples of frequency fN, where fN is
determined by the input control bits FA and FB (fN = 50Hz
or 60Hz or 55Hz for simultaneous rejection). Multiples of
themodulatorsamplingrate(fS=fN256)onlyrejectnoise
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 RSOURCE
at VREF (Large CREF)
Figure 16. –FS Error vs RSOURCE
at VREF (Large CREF)
RSOURCE ()
0
+FS
ERROR
(ppm) 300
400
500
800
2495 F15
200
100
0
200
400
600
1000
VCC = 5V
VREF = 5V
VIN+ = 3.75V
VIN– = 1.25V
FO = GND
TA = 25°C
CREF = 1F, 10F
CREF = 0.1F
CREF = 0.01F
RSOURCE ()
0
–FS
ERROR
(ppm) –200
–100
0
800
2495 F16
–300
–400
–500
200
400
600
1000
VCC = 5V
VREF = 5V
VIN+ = 1.25V
VIN– = 3.75V
FO = GND
TA = 25°C
CREF = 1F, 10F
CREF = 0.1F
CREF = 0.01F
VIN/VREF
–0.5
INL
(ppm
OF
V REF
)
2
6
10
0.3
2495 F17
–2
–6
0
4
8
–4
–8
–10
–0.3
–0.1
0.1
0.5
VCC = 5V
VREF = 5V
VIN(CM) = 2.5V
TA = 25°C
C= 10F
R = 1k
R = 100
R = 500
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
0 fS 2fS 3fS 4fS 5fS 6fS 7fS 8fS 9fS10fS11fS12fS
INPUT
NORMAL
MODE
REJECTION
(dB)
2495 F18
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
0
fS
INPUT
NORMAL
MODE
REJECTION
(dB)
2495 F19
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
2fS 3fS 4fS 5fS 6fS 7fS 8fS 9fS 10fS
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