參數(shù)資料
型號(hào)： LTC1420
廠商： Linear Technology Corporation
英文描述： 12-Bit, 10Msps, Sampling ADC(12位, 10Msps,采樣模數(shù)轉(zhuǎn)換器)
中文描述： 12位，10Msps的器件，采樣ADC（12位，10Msps的器件，采樣模數(shù)轉(zhuǎn)換器）
文件頁(yè)數(shù)： 10/20頁(yè)
文件大?。?/td> 272K
代理商： LTC1420
10
LTC1420
Table 2. Comparison of Analog Input Configurations
SUPPLIES
COUPLING
±
5V
DC
5V
DC
5V
DC
5V
DC
5V
DC
±
5V
AC
(Transformer)
5V
AC
(Transformer)
V
REF
4.096V
4.096V
2.048V
4.096V
4.096V
4.096V
GAIN
1
×
2
×
1
×
1
×
1
×
1
×
A
IN+
±
2.048
2.5
±
1.024
2.5
±
1.024
2.5
±
2.048
0 to 4.096
±
1.024
A
IN–
0
2.5
2.5
2.5
2.048
±
1.024
COMMENTS
Best SNR, THD
Best SINAD, THD for Single Supply
Worse Noise than Above Case
Best Single Supply Noise, THD Is Not Optimal
Same As Above
Very Best SNR, THD
4.096V
1
×
2.5
±
1.024
2.5
±
1.024
Very Best SNR, THD for Single Supply
1420 F05
1
μ
F
+A
IN
V
SS
V
IN
2.5V
LTC1420
–A
IN
5V
V
CM
1420 F06
+A
IN
V
SS
V
IN
4.096V
0V
5V
2.048V
LTC1420
–A
IN
5V
SENSE
Figure 4. DC Coupling a Ground
Centered Signal (Dual Supply System)
Figure 5. DC Coupling a Signal Centered
Around 2.5V (Single Supply System)
Figure 6. DC Coupling a 0V to 4.096V Signal
1420 F07
+A
IN
V
SS
V
IN
1
μ
F
0V
C
C
R
R
LTC1420
–A
IN
5V
V
CM
Figure 7. AC Coupling to the LTC1420. Note That the Input Signal
Can Almost Always Be Directly Coupled with Better Performance
1420 F04
1
μ
F
+A
IN
V
SS
V
IN
0V
LTC1420
–A
IN
5V
–5V
V
CM
APPLICATIO
S I
FOR
ATIO
U
W
U
U
DC Coupling the Input
In most applications the analog input signal can be directly
coupled to the LTC1420 inputs. If the input signal is
centered around ground, such as when dual supply op
amps are used, simply connect –A
IN
to ground and
connect V
SS
to –5V (Figure 4). In a single power supply
system with the input signal centered around 2.5V, con-
nect –A
IN
to V
CM
and V
SS
to ground (Figure 5). If the input
signal is not centered around ground or 2.5V, the voltage
for –A
IN
must be generated externally by a resistor divider
or a voltage reference (Figure 6).
AC Coupling the Input
The analog inputs to the LTC1420 can also be AC coupled
through a capacitor, though in most cases it is simpler to
directly couple the input to the ADC. Figure 7 shows an
example where the input signal is centered around ground
and the ADC operates from a single 5V supply. Note that
the performance would improve if the ADC was operated
from a dual supply and the input was directly coupled (as
in Figure 4). With AC coupling the DC resistance to ground
should be roughly matched for +A
IN
and –A
IN
to maintain
offset accuracy.
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