參數(shù)資料
型號(hào): LTC2486IDE#TRPBF
廠商: Linear Technology
文件頁(yè)數(shù): 21/36頁(yè)
文件大小: 0K
描述: IC ADC 16BIT W/PGA 14-DFN
標(biāo)準(zhǔn)包裝: 2,500
位數(shù): 16
采樣率(每秒): 15
數(shù)據(jù)接口: MICROWIRE?,串行,SPI?
轉(zhuǎn)換器數(shù)目: 1
功率耗散(最大): 800µW
電壓電源: 單電源
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 14-WFDFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 14-DFN-EP(4x3)
包裝: 帶卷 (TR)
輸入數(shù)目和類型: 4 個(gè)單端,雙極;2 個(gè)差分,雙極
配用: DC1009A-C-ND - BOARD DELTA SIGMA ADC LTC2486
LTC2486
28
2486fd
APPLICATIONS INFORMATION
and reference bypass capacitance) linearity and gain errors
are introduced.
For relatively small values of external reference capacitance
(CREF < 1nF), the voltage on the sampling capacitor settles
for reference impedances of many kΩ (if CREF = 100pF up
to 10kΩ will not degrade the performance) (see Figures
13 and 14).
In cases where large bypass capacitors are required on
the reference inputs (CREF > 0.01μF) 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 operating
in simultaneous 50Hz/60Hz mode) (see Figures 15 and 16).
If the input common mode voltage is equal to the reference
common mode voltage, a linearity error of approximately
0.67ppm per 100Ω of reference resistance results (see
Figure 17). In applications where the input and reference
common mode voltages are different, the errors increase.
Figure 13. +FS Error vs RSOURCE at VREF (Small CREF)
Figure 14. –FS Error vs RSOURCE at VREF (Small CREF)
RSOURCE (Ω)
0
+FS
ERROR
(ppm)
50
70
90
10k
2486 F13
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 = 0.01μF
CREF = 0.001μF
CREF = 100pF
CREF = 0pF
RSOURCE (Ω)
0
–FS
ERROR
(ppm) –30
–10
10
10k
2486 F14
–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 = 0.01μF
CREF = 0.001μF
CREF = 100pF
CREF = 0pF
Figure 15. +FS Error vs RSOURCE at VREF (Large CREF)
Figure 16. –FS Error vs RSOURCE at VREF (Large CREF)
RSOURCE (Ω)
0
+FS
ERROR
(ppm) 300
400
500
800
2486 F15
200
100
0
200
400
600
1000
VCC = 5V
VREF = 5V
VIN
+ = 3.75V
VIN
= 1.25V
fO = GND
TA = 25°C
CREF = 1μF, 10μF
CREF = 0.1μF
CREF = 0.01μF
RSOURCE (Ω)
0
–FS
ERROR
(ppm) –200
–100
0
800
2486 F16
–300
–400
–500
200
400
600
1000
VCC = 5V
VREF = 5V
VIN
+ = 1.25V
VIN
= 3.75V
fO = GND
TA = 25°C
CREF = 1μF, 10μF
CREF = 0.1μF
CREF = 0.01μF
Figure 17. INL vs Differential Input Voltage and Reference
Source Resistance for CREF > 1μF
VIN/VREF
–0.5
INL
(ppm
OF
V
REF
)
2
6
10
0.3
2486 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
CREF = 10μF
R = 1k
R = 100Ω
R = 500Ω
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