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LTC2411/LTC2411-1
30
internal calibration and filtering. The noise of the driving
amplifier referred to the converter input and including all
these effects can be calculated as N = ni √freqi. The total
system noise (referred to the LTC2411/LTC2411-1 input)
can now be obtained by summing as square root of sum
of squares the three ADC input referred noise sources: the
LTC2411/LTC2411-1 internal noise (1.45
V), the noise of
the IN+ driving amplifier and the noise of the IN– driving
amplifier.
If the FO pin is driven by an external oscillator of frequency
fEOSC, Figure 29 can still be used for noise calculation if the
x-axis is scaled by fEOSC/153600. For large values of the
ratio fEOSC/153600, the Figure 29 plot accuracy begins to
decrease, but in the same time the LTC2411/LTC2411-1
noise floor rises and the noise contribution of the driving
amplifiers lose significance.
Normal Mode Rejection and Antialiasing
One of the advantages delta-sigma ADCs offer over con-
ventional ADCs is on-chip digital filtering. Combined with
a large oversampling ratio, the LTC2411/LTC2411-1 sig-
nificantly simplifies antialiasing filter requirements.
The sinc4 digital filter provides greater than 120dB normal
mode rejection at all frequencies except DC and integer
multiples of the modulator sampling frequency (fS). The
LTC2411/LTC2411-1’s autocalibration circuits further sim-
plify the antialiasing requirements by additional normal
mode signal filtering both in the analog and digital domain.
Independent of the operating mode, fS = 256 fN = 2048
fOUTMAX where fN is the notch frequency and fOUTMAX is
the maximum output data rate. In the internal oscillator
mode, for the LTC2411, FS = 12800Hz with a 50Hz notch
setting and fS = 15360Hz with a 60Hz notch setting. For the
LTC2411-1, fS = 13980Hz (FO = LOW). In the external
oscillator mode, fS = fEOSC/10.
The combined normal mode rejection performance is
shown in Figure 30 for the internal oscillator with 50Hz
notch setting (FO = HIGH) and in Figure 31 for the internal
oscillator with FO = LOW and for the external oscillator
mode. The regions of low rejection occurring at integer
multiples of fS have a very narrow bandwidth. Magnified
details of the normal mode rejection curves are shown in
APPLICATIO S I FOR ATIO
WU
UU
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
0fS 2fS 3fS 4fS 5fS 6fS 7fS 8fS 9fS10fS11fS12fS
INPUT
NORMAL
MODE
REJECTION
(dB)
2411 F30
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
FO = HIGH
FO = LOW OR
FO = EXTERNAL OSCILLATOR,
fEOSC = 10 fS
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
0fS
INPUT
NORMAL
MODE
REJECTION
(dB)
2411 F31
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
2fS 3fS 4fS 5fS 6fS 7fS 8fS 9fS 10fS
Figure 30. Input Normal Mode Rejection,
Internal Oscillator and 50Hz Notch (LTC2411)
Figure 31. Input Normal Mode Rejection, Internal
Oscillator and FO = LOW or External Oscillator
INPUT NOISE SOURCE SINGLE POLE
EQUIVALENT BANDWIDTH (Hz)
1
INPUT
REFERRED
NOISE
EQUIVALENT
BANDWIDTH
(Hz)
10
100
1000
10
100
1k
10k 100k
1M
2411 G29
0.1
1
FO = LOW
FO = HIGH
Figure 29. Input Referred Noise Equivalent Bandwidth
of an Input Connected White Noise Source
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