參數(shù)資料
型號(hào): LT2435CGN#PBF
廠商: LINEAR TECHNOLOGY CORP
元件分類(lèi): ADC
英文描述: 1-CH 20-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO16
封裝: 0.150 INCH, LEAD FREE, PLASTIC, SSOP-16
文件頁(yè)數(shù): 19/40頁(yè)
文件大小: 458K
代理商: LT2435CGN#PBF
LTC2435/LTC2435-1
26
24351fb
APPLICATIO S I FOR ATIO
WU
U
Figure 14. LTC2435/LTC2435-1 Equivalent Analog Input Circuit
Figure 15. An RC Network at IN+ and IN
Figure 17. –FS Error vs RSOURCE at IN
+ or IN(Small CIN)
Figure 16. +FS Error vs RSOURCE at IN+ or IN(Small CIN)
IIN
VV
V
R
IIN
VV
V
R
I REF
VV
V
R
V
VR
I REF
VV
V
R
V
VR
where
AVG
IN
INCM
REFCM
EQ
AVG
IN
INCM
REFCM
EQ
AVG
REF
INCM
REFCM
EQ
IN
REF
EQ
AVG
REF
INCM
REFCM
EQ
IN
REF
EQ
+
+
() = +
() = +
() = +
() = +
+
05
15
05
15
05
2
.
::
V
REF
V
REF
VIN
IN
V
IN
REF
REFCM
IN
INCM
REQ = 43.2MΩ INTERNAL OSCILLATOR 60Hz NOTCH (FO = LOW) LTC2435
REQ = 52MΩ INTERNAL OSCILLATOR 50Hz NOTCH (FO = HIGH) LTC2435
REQ = 48MΩ INTERNAL OSCILLATOR 50Hz/60Hz NOTCH (FO = LOW) LTC2435-1
REQ = (6.7 1012)/fEOSC EXTERNAL OSCILLATOR
=
+
=
+
2
VREF+
VIN+
VCC
RSW (TYP)
20k
ILEAK
VCC
ILEAK
VCC
RSW (TYP)
20k
CEQ
18pF
(TYP)
RSW (TYP)
20k
ILEAK
IIN+
VIN
IIN
IREF+
IREF
2435 F18
ILEAK
VCC
ILEAK
SWITCHING FREQUENCY
fSW = 76800Hz INTERNAL
OSCILLATOR (LTC2435)
(FO = LOW OR HIGH)
fSW = 69900Hz INTERNAL
OSCILLATOR (LTC2435-1)
(FO = LOW)
fSW = 0.5 fEOSC EXTERNAL OSCILLATOR
VREF
RSW (TYP)
20k
CIN
2435 F19
VINCM + 0.5VIN
RSOURCE
IN+
LTC2435/
LTC2435-1
CPAR
20pF
CIN
VINCM – 0.5VIN
RSOURCE
IN
CPAR
20pF
RSOURCE (W)
1
+FS
ERROR
VARIATION
(ppm)
10
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
10000
2435 F16
10
100
1000
100000
CIN = 0pF
CIN = 100pF
CIN = 0.01μF
CIN = 0.001μF
VCC = 5V
VREF+ = 5V
VREF– = GND
VIN+ = 3.75V
VIN– = 1.25V
FO = GND
TA = 25°C
RSOURCE (W)
1
FS
ERROR
VARIATION
(ppm)
100
90
80
70
60
50
40
30
20
10
0
–10
10000
2435 F17
10
100
1000
100000
CIN = 0pF
CIN = 0.01μF
VCC = 5V
VREF+ = 5V
VREF– = GND
VIN+ = 1.25V
VIN– = 3.75V
FO = GND
TA = 25°C
CIN = 100pF
CIN = 0.001μF
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