參數(shù)資料
型號(hào): LTC2494IUHF#TRPBF
廠商: Linear Technology
文件頁(yè)數(shù): 25/38頁(yè)
文件大小: 0K
描述: IC ADC 16BIT W/PGA 38-QFN
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): 480µW
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: 38-WFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 38-QFN(5x7)
包裝: 帶卷 (TR)
輸入數(shù)目和類型: 16 個(gè)單端,雙極;8 個(gè)差分,雙極
配用: DC1011A-C-ND - BOARD DELTA SIGMA ADC LTC2494
LTC2494
2494fd
applications inForMation
100pF up to 10k will not degrade the performance) (see
Figures 14, 15).
In cases where large bypass capacitors are required
on the reference inputs (CREF > 0.01F) full-scale and
linearity errors are proportional to the value of the refer-
ence resistance. Every ohm of reference resistance pro-
duces a full-scale error of approximately 0.5ppm (while
operating in simultaneous 50Hz/60Hz mode) (see Figures
16 and 17). If the input common mode voltage is equal to
the reference common mode voltage, a linearity error of
approximately 0.67ppm per 100
Ω of reference resistance
results (see Figure 18). In applications where the input
and reference common mode voltages are different, the
errorsincrease.A1Vdifferenceinbetweencommonmode
input and common mode reference results in a 6.7ppm
INL error for every 100
Ω of reference resistance.
Figure 16. +FS Error vs RSOURCE at VREF (Large CREF)
Figure 17. –FS Error vs RSOURCE at VREF (Large CREF)
Figure 18. INL vs Differential Input Voltage and
Reference Source Resistance for CREF > 1F
Figure 14. +FS Error vs RSOURCE at VREF (Small CREF)
Figure 15. –FS Error vs RSOURCE at VREF (Small CREF)
RSOURCE ()
0
+FS
ERROR
(ppm)
50
70
90
10k
2494 F14
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
RSOURCE ()
0
–FS
ERROR
(ppm) –30
–10
10
10k
2494 F15
–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
2494 F16
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
2494 F17
–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
2494 F18
–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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