參數(shù)資料
型號： LTC2439-1CGN
廠商： LINEAR TECHNOLOGY CORP
元件分類： ADC
英文描述： 8-/16-Channel 16-Bit No Latency Delta-Sigma ADC
中文描述： 16-CH 16-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO28
封裝： 0.150 INCH, PLASTIC, SSOP-28
文件頁數(shù)： 21/28頁
文件大小： 288K
代理商： LTC2439-1CGN
LTC2439-1
21
24391f
Figure12), a first order passive network with a time
constant
τ
= (R
S
+ R
SW
) C
EQ
. The converter is able to
sample the input signal with better than 1LSB accuracy if
the sampling period is at least 11 times greater than the
input circuit time constant
τ
. The sampling process on the
four input analog pins is quasi-independent so each time
constant should be considered by itself and, under worst-
case circumstances, the errors may add.
When using the internal oscillator (F
O
= LOW), the
LTC2439-1’s front-end switched-capacitor network is
clocked at 69900Hz corresponding to a 14.3
μ
s sampling
period. Thus, for settling errors of less than 1LSB, the
driving source impedance should be chosen such that
τ
≤
14.3
μ
s/11 = 1.3
μ
s. When an external oscillator of
APPLICATIOU
W
U
U
frequency f
EOSC
is used, the sampling period is 2/f
EOSC
and, for a settling error of less than 1LSB,
τ
≤
0.18/f
EOSC
.
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 IN
–
pins as a result of the
sampling charge transfers when integrated over a sub-
stantial time period (longer than 64 internal clock cycles).
V
REF
+
V
IN
+
V
CC
R
SW
(TYP)
20k
I
LEAK
I
LEAK
V
CC
V
CC
I
LEAK
I
LEAK
R
SW
(TYP)
20k
C
18pF
(TYP)
R
SW
(TYP)
20k
I
LEAK
I
IN
+
V
IN
–
I
IN
–
I
REF
+
I
REF
–
24391 F11
I
LEAK
V
CC
I
LEAK
I
LEAK
SWITCHING FREQUENCY
f
SW
= 69900Hz INTERNAL OSCILLATOR (F
O
= LOW)
f
SW
= 0.5 f
EOSC
EXTERNAL OSCILLATOR
V
REF
–
R
SW
(TYP)
20k
Figure 12. LTC2439-1 Equivalent Analog Input Circuit
I IN
(
(
(
(
V
V
0 5
.
V
R
I IN
V
V
0 5
.
V
R
0 5
.
I REF
V
V
V
R
V
V
V
R
2
I REF
V
V
R
V
V
R
where
V
REF
AVG
IN
INCM
REFCM
EQ
AVG
)
)
:
REF
=
IN
INCM
REFCM
EQ
AVG
REF
INCM
0 5
.
REFCM
EQ
IN
REF
EQ
AVG
REF
INCM
REFCM
EQ
IN
REF
EQ
+
+
)
)
=
+
=
+
=
+
=
+
+
1 5
.
1 5
.
2
.
/
.
/
REF
+
V
REF
REF
V
IN
IN
+
V
IN
IN
R
M
INTERNAL OSCILLATOR
)
Hz
Hz Notch F
60
LOW
R
f
EXTERNAL OSCILLATOR
REFCM
IN
INCM
EQ
O
EQ
EOSC
=
+
2
=
=
2
=
=
(
)
=
(
+
+
3 97
50
0 555 10
12
相關(guān)PDF資料
PDF描述
LTC2439-1 8-/16-Channel 16-Bit No Latency Delta-Sigma ADC
LTC2439-1IGN 8-/16-Channel 16-Bit No Latency Delta-Sigma ADC
LTC2440CGN 24-Bit High Speed Differential delta-sigma ADC with Selectable Speed/Resolution
LTC2440IGN 24-Bit High Speed Differential delta-sigma ADC with Selectable Speed/Resolution
LTC2444 24-Bit High Speed 8-/16-Channel ADCs with Selectable Speed/Resolution
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