參數(shù)資料
型號： LTC1405IGN
廠商： LINEAR TECHNOLOGY CORP
元件分類： ADC
英文描述： 12-Bit, 5Msps, Sampling ADC
中文描述： 1-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PDSO28
封裝： 0.150 INCH, PLASTIC, SSOP-28
文件頁數(shù)： 9/16頁
文件大小： 218K
代理商： LTC1405IGN
9
LTC 1405
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
1x
2x
1x
1x
1x
1x
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
1x
2.5
±
1.024
2.5
±
1.024
Very Best SNR, THD for Single Supply
APPLICATIO S U
U
W
U
1405 F05
1
μ
F
+A
IN
V
SS
V
IN
2.5V
LTC1405
–A
IN
5V
V
CM
1405 F06
+A
IN
V
SS
V
IN
4.096V
0V
5V
2.048V
LTC1405
–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
AC Coupling the Input
The analog inputs to the LTC1405 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.
DC Coupling the Input
In most applications the analog input signal can be directly
coupled to the LTC1405 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 con-
nect 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).
1405 F07
+A
IN
V
SS
V
IN
1
μ
F
0V
C
C
R
R
LTC1405
–A
IN
5V
V
CM
Figure 7. AC Coupling to the LTC1405. Note That the Input Signal
Can Almost Always Be Directly Coupled with Better Performance
1405 F04
1
μ
F
+A
IN
V
SS
V
IN
0V
LTC1405
–A
IN
5V
–5V
V
CM
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