VREF translates into about 2.18 10
參數(shù)資料
型號: LTC2480CMS#PBF
廠商: Linear Technology
文件頁數(shù): 25/42頁
文件大?。?/td> 0K
描述: IC ADC 16BIT 10-MSOP
標準包裝: 50
位數(shù): 16
采樣率(每秒): 7.5
數(shù)據(jù)接口: MICROWIRE?,串行,SPI?
轉換器數(shù)目: 1
電壓電源: 單電源
工作溫度: 0°C ~ 70°C
安裝類型: 表面貼裝
封裝/外殼: 10-TFSOP,10-MSOP(0.118",3.00mm 寬)
供應商設備封裝: 10-MSOP
包裝: 管件
輸入數(shù)目和類型: 2 個單端,雙極;1 個差分,雙極
配用: DC798B-ND - BOARD DELTA SIGMA ADC LTC2480
LTC2480
2480fd
applicaTions inForMaTion
VREF translates into about 2.18 10–6 fEOSCppm addi-
tional INL error. Figure 19 shows the typical INL error due
to the source resistance driving the VREF pin when large
CREF values are used. The user is advised to minimize the
source impedance driving the VREF pin.
In applications where the reference and input common
mode voltages are different, extra errors are introduced.
For every 1V of the reference and input common mode
voltage difference (VREFCM – VINCM) and a 5V reference,
each Ohm of reference source resistance introduces an
extra (VREFCM – VINCM)/(VREF REQ) full-scale gain error,
whichis0.074ppmwhenusinginternaloscillatorand60Hz
mode.Whenusinginternaloscillatorand50Hz/60Hzmode,
the extra full-scale gain error is 0.067ppm. When using
RSOURCE ()
0
+FS
ERROR
(ppm)
50
70
90
10k
2480 F15
30
10
40
60
80
20
0
–10
10
100
1k
100k
VCC = 5V
VREF = 5V
VIN+ = 3.75V
VIN– = 1.25V
FO = GND
TA = 25°C
CREF = 0.01F
CREF = 0.001F
CREF = 100pF
CREF = 0pF
Figure 15. +FS Error vs RSOURCE at VREF (Small CREF)
Figure 16. –FS Error vs RSOURCE at VREF (Small CREF)
Figure 17. +FS Error vs RSOURCE at VREF (Large CREF)
RSOURCE ()
0
–FS
ERROR
(ppm) –30
–10
10
10k
2480 F16
–50
–70
–40
–20
0
–60
–80
–90
10
100
1k
100k
VCC = 5V
VREF = 5V
VIN+ = 1.25V
VIN– = 3.75V
FO = GND
TA = 25°C
CREF = 0.01F
CREF = 0.001F
CREF = 100pF
CREF = 0pF
RSOURCE ()
0
+FS
ERROR
(ppm) 300
400
500
800
2480 F17
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
Figure 18. –FS Error vs RSOURCE at VREF (Large CREF)
Figure 19. INL vs Differential Input Voltage and
Reference Source Resistance for CREF > 1F
RSOURCE ()
0
–FS
ERROR
(ppm) –200
–100
0
800
2480 F18
–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 (V)
–0.5
INL
(ppm
OF
V
REF
)
2
6
10
0.3
2480 F19
–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
CREF = 10F
R = 1k
R = 100
R = 500
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