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參數(shù)資料
| 型號： | LTC2453 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Easy-to-Use, Ultra-Tiny, Differential, 16-Bit ADC With I2C Interface |
| 中文描述： | 易于使用，超微型，差分，16位ADC，帶有I2C接口 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 223K |
| 代理商： | LTC2453 |
LTC2453
11
2453f
first to the decoupling capacitors described above, the
second to the ground return for the input signal source,
and the third to the ground return for the power supply
voltage source.
Driving REF
+
and REF
–
A simplified equivalent circuit for REF
+
and REF
–
is shown
in Figure 8. Like all other A/D converters, the LTC2453 is
only as accurate as the reference it is using. Therefore, it
is important to keep the reference line quiet by careful low
and high frequency power supply decoupling.
The LT6660 reference is an ideal match for driving the
LTC2453’s REF
+
pin. The LTC6660 is available in a 2mm
×
2mm DFN package with 2.5V, 3V, 3.3V and 5V options.
A 0.1μF, high quality, ceramic capacitor in parallel with
a 10μF ceramic capacitor should be connected between
the REF
+
/REF
–
and GND pins, as close as possible to the
R
SW
15k
(TYP)
I
LEAK
I
LEAK
V
CC
V
CC
V
CC
V
CC
C
0.35pF
(TYP)
IN
+
IN–
REF
–
REF
+
2453 F08
R
15k
(TYP)
I
LEAK
I
LEAK
R
15k
(TYP)
I
LEAK
I
LEAK
R
15k
(TYP)
I
LEAK
I
LEAK
Figure 8. LTC2453 Analog Input/Reference Equivalent Circuit
I
LEAK
I
LEAK
R
15k
(TYP)
I
CONV
C
IN
IN
+
V
CC
SIG
+
SIG
–
R
S
C
EQ
0.35pF
(TYP)
C
PAR
+
2453 F09
I
LEAK
I
LEAK
R
15k
(TYP)
I
CONV
C
IN
IN
–
V
CC
R
S
C
EQ
0.35pF
(TYP)
C
PAR
+
Figure 9. LTC2453 Input Drive Equivalent Circuit
package. The 0.1μF capacitor should be placed closest
to the ADC.
Driving V
IN+
and V
IN–
The input drive requirements can best be analyzed using
the equivalent circuit of Figure 9. The input signal V
SIG
is
connected to the ADC input pins (IN
+
and IN
–
) through an
equivalent source resistance R
S
. This resistor includes both
the actual generator source resistance and any additional
optional resistors connected to the input pins. Optional
input capacitors C
IN
are also connected to the ADC input
pins. This capacitor is placed in parallel with the ADC
input parasitic capacitance C
PAR
. Depending on the PCB
layout, C
PAR
has typical values between 2pF and 15pF. In
addition, the equivalent circuit of Figure 9 includes the
converter equivalent internal resistor R
SW
and sampling
capacitor C
EQ
.
There are some immediate trade-offs in R
S
and C
IN
without
needing a full circuit analysis. Increasing R
S
and C
IN
can
give the following benefits:
1) Due to the LTC2453’s input sampling algorithm, the
input current drawn by either V
IN+
or V
IN–
over a con-
version cycle is 50nA. A high R
S
C
IN
attenuates the
high frequency components of the input current, and
R
S
values up to 1k result in <1LSB error.
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