參數(shù)資料
型號(hào): LTC2436-1CGN#TR
廠商: Linear Technology
文件頁(yè)數(shù): 13/28頁(yè)
文件大小: 0K
描述: IC CONV A/D 16B 2CH DIFF 16SSOP
標(biāo)準(zhǔn)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: 1
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(lèi)型: 表面貼裝
封裝/外殼: 16-SSOP(0.154",3.90mm 寬)
供應(yīng)商設(shè)備封裝: 16-SSOP
包裝: 帶卷 (TR)
輸入數(shù)目和類(lèi)型: 1 個(gè)差分,雙極
LTC2436-1
20
24361f
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 LTC2436-1 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)
APPLICATIO S I FOR ATIO
WU
UU
CIN
24361 F13
VINCM + 0.5VIN
RSOURCE
IN+
LTC2436-1
CPAR
20pF
CIN
VINCM – 0.5VIN
RSOURCE
IN
CPAR
20pF
RSOURCE ()
1
10
100
1k
10k
100k
+FS
ERROR
(LSB)
24361 F14
3
0
1
2
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
Figure 12. LTC2436-1 Equivalent Analog Input Circuit
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
24361 F12
ILEAK
VCC
ILEAK
SWITCHING FREQUENCY
fSW = 69.900Hz INTERNAL OSCILLATOR (FO = LOW OR HIGH)
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
397
50
60
0 555 1012
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