AN221E04 Datasheet – Dynamically Reconfigurable FPAA With Enhanced I/O
DS030100-U006a
- 8 -
Input Differential Chopper Amplifier on and filter OFF
Parameter
Symbol
Min
Typ
Max
Unit
Comment
Input Range
Vina
Vdiffina
See analog input above
Usable input range will be reduced
by the effective gain setting
Gain Setting
Ginamp
16
-
128
Gain Accuracy
-
1.0
2.5
%
Gain Drift, (Temperature, Supply
Voltage and Time)
-
-
1.0
%
Chopper Frequency Clock Range
Fch
Fc/260100
-
>250
KHz
Fc = master clock frequency
Set Fch as slow as possible
Fch > 250KHz will result in some
signal attenuation
Equivalent Input Offset Voltage
Vos
-
<100
200
µV
Chopper stabilized amplifier
The maximum value of 200µV is
guaranteed by production test
This is a tester limitation
Offset Voltage Temperature
Coefficient
Voffsettc
-
0.5
2.0
µV/°C
from -40°C to 125°C
Power Supply Rejection Ratio
PSRR
65
-
-
dB
d.c.
a.c. See graphs on page 18
Common Mode Rejection Ratio
CMRR
-
102
-
dB
Large Signal Harmonic Distortion
Dist
-
-40
-
dB
0.4v p-p Differential input at
660Hz
Gain setting = 16
Input Frequency
Fain
0
Fch/20
Fch/2
KHz
Fch=Chopper clock frequency
The chopper frequency and
input frequency should be
chosen such that subsequent
low pass filtering can remove the
chopper stage frequency
elements
Input Resistance
Rin
10
-
Mohm
Input to filter or chopper
Input Capacitance
Cin
-
5.0
pF
Input Referred Noise Figure
NF
-
0.09
-
µV/sqrtHz
Input cell Gain = 16
Applies to Audio frequency
range Chopper clock Fch =
250KHz
See graphical data on page 18
Signal-to Noise Ratio and
Distortion
SINAD
-
75
-
dB
Input signal = 285 mV p-p
differential,
Audio frequency range
See graphical data on page 18
Spurious Free Dynamic Range
SFDR
-
74
-
dB
Input signal =100 mV p-p
differential
See graphical data on page 18
Input Differential Amplifier OFF and filter ON
Parameter
Symbol
Min
Typ
Max
Unit
Comment
Input Range
Vina
Vdiffina
See analog input above
Equivalent Input Offset
Vos
-
8
32
mV
Non-chopper stabilized input,
Filter corner frequency =470KHz
Offset Voltage Temperature
Coefficient
Voffsettc
-
0.05 I
1.0 II
mV/°C
from -40°C to 125°C
I. measured at filter corner=470Khz
II. maximum at Filter corner=76KHz
Input Frequency
Fain
-
-
-
MHz
Input filter frequency will define the
maximum frequency
Input filter is recommended to be
>30x higher than the max input
frequency, for 80dB distortion
performance
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