參數(shù)資料
型號: LTC2433-1CMS#TRPBF
廠商: Linear Technology
文件頁數(shù): 13/28頁
文件大?。?/td> 0K
描述: IC ADC DIFF 16BIT 3WIRE 10-MSOP
標準包裝: 2,500
位數(shù): 16
采樣率(每秒): 6.8
數(shù)據(jù)接口: MICROWIRE?,串行,SPI?
轉(zhuǎn)換器數(shù)目: 2
功率耗散(最大): 1mW
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(yīng)商設(shè)備封裝: 10-MSOP
包裝: 帶卷 (TR)
輸入數(shù)目和類型: 1 個差分,雙極
配用: DC745A-ND - BOARD DELTA SIGMA ADC LTC2433-1
LTC2433-1
20
24331fa
period. Thus, for settling errors of less than 1LSB, the
driving source impedance should be chosen such that
τ ≤
14.3
s/11 = 1.3s. When an external oscillator of fre-
quency fEOSC is used, the sampling period is 2/fEOSC and,
for a settling error of less than 1LSB,
τ ≤ 0.18/fEOSC.
Input Current
If complete settling occurs on the input, conversion re-
sults will be unaffected by the dynamic input current. An
incomplete settling of the input signal sampling process
may result in gain and offset errors, but it will not degrade
the INL performance of the converter. Figure 12 shows the
mathematical expressions for the average bias currents
flowing through the IN+ and INpins as a result of the
sampling charge transfers when integrated over a sub-
stantial time period (longer than 64 internal clock cycles).
The effect of this input dynamic current can be analyzed
using the test circuit of Figure 13. The CPAR capacitor
includes the LTC2433-1 pin capacitance (5pF typical) plus
the capacitance of the test fixture used to obtain the results
shown in Figures 14 and 15. A careful implementation can
bring the total input capacitance (CIN + CPAR) closer to 5pF
thus achieving better performance than the one predicted
Figure 13. An RC Network at IN+ and IN
Figure 14. +FS Error vs RSOURCE at IN
+ or IN(Small CIN)
CIN
24331 F13
VINCM + 0.5VIN
RSOURCE
IN+
LTC2433-1
CPAR
20pF
CIN
VINCM – 0.5VIN
RSOURCE
IN
CPAR
20pF
Figure 12. LTC2433-1 Equivalent Analog Input Circuit
VREF+
VIN+
VCC
RSW (TYP)
20k
ILEAK
VCC
ILEAK
VCC
RSW (TYP)
20k
CEQ
6pF
(TYP)
RSW (TYP)
20k
ILEAK
IIN+
VIN
IIN
IREF+
IREF
24331 F12
ILEAK
VCC
ILEAK
SWITCHING FREQUENCY
fSW = 69900Hz INTERNAL OSCILLATOR (FO = LOW)
fSW = 0.5 fEOSC EXTERNAL OSCILLATOR
VREF
RSW (TYP)
20k
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
R
M
INTERNAL OSCILLATOR
Hz
Hz Notch F
LOW
R
f
EXTERNAL OSCILLATOR
REF
REFCM
IN
INCM
EQ
O
EQ
EOSC
=
+
=
==
()
=
()
+
2
11 9
50
60
167 1012
RSOURCE ()
1
10
100
1k
10k
100k
+FS
ERROR
(LSB)
24331 F14
3
2
1
0
VCC = 5V
REF+ = 5V
REF= GND
IN+ = 5V
IN= 2.5V
FO = GND
TA = 25°C
CIN = 0.01F
CIN = 0.001F
CIN = 100pF
CIN = 0pF
APPLICATIO S I FOR ATIO
WU
UU
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