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LTC1420
1420fa
Table 2. Comparison of Analog Input Configurations
SUPPLIES
COUPLING
VREF
GAIN
AIN
+
AIN
–
COMMENTS
±5V
DC
4.096V
1×±2.048
0
Best SNR, THD
5V
DC
4.096V
2×
2.5 ± 1.024
2.5
Best SINAD, THD for Single Supply
5V
DC
2.048V
1×
2.5 ± 1.024
2.5
Worse Noise than Above Case
5V
DC
4.096V
1×
2.5 ± 2.048
2.5
Best Single Supply Noise, THD Is Not Optimal
5V
DC
4.096V
1×
0 to 4.096
2.048
Same As Above
±5V
AC
4.096V
1×±1.024
±1.024
Very Best SNR, THD
(Transformer)
5V
AC
4.096V
1×
2.5 ± 1.024
Very Best SNR, THD for Single Supply
(Transformer)
1420 F05
1F
+AIN
VSS
VIN
2.5V
LTC1420
5V
–AIN
VCM
1420 F06
+AIN
VSS
VIN
4.096V
0V
5V
2.048V
LTC1420
5V
–AIN
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
+AIN
VSS
VIN
1F
0V
C
RR
LTC1420
5V
–AIN
VCM
Figure 7. AC Coupling to the LTC1420. Note That the Input Signal
Can Almost Always Be Directly Coupled with Better Performance
1420 F04
1F
+AIN
VSS
VIN
0V
LTC1420
5V
–5V
–AIN
VCM
APPLICATIONS INFORMATION
WU
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 – AIN to ground and
connect VSS to –5V (Figure 4). In a single power supply
system with the input signal centered around 2.5V, con-
nect – AIN to VCM and VSS to ground (Figure 5). If the input
signal is not centered around ground or 2.5V, the voltage
for – AIN 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 + AIN and – AIN to maintain
offset accuracy.
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