Datasheet

ADuC7033
Rev. B | Page 47 of 140
ADC NOISE PERFORMANCE TABLES
Table 32, Table 33, and Table 34 list the output rms noise in V for some typical output update rates on the I- and V/T-ADCs. The
numbers are typical and are generated at a differential input voltage of 0 V. The output rms noise is specified as the standard deviation
(or 1 sigma) of the distribution of ADC output codes collected when the ADC input voltage is at a dc voltage. It is expressed as V rms.
Table 32. Current Channel ADC, Normal Power Mode, Typical Output RMS Noise
ADCFLT
Data
Update
Rate
ADC Input Range
±2.3 mV
(512)
±4.6 mV
(256)
±9.375 mV
(128)
±18.75 mV
(64)
±37.5 mV
(32)
±75 mV
(16)
±150 mV
(8)
±300 mV
(4
1
)
±600 mV
(2
1
)
±1.2 V
(1
1
)
0xBF1D 4 Hz 0.040 V 0.040 V 0.043 V 0.045 V 0.087 V 0.175 V 0.35 V 0.7 V 1.4 V 2.8 V
0x961F 10 Hz 0.060 V 0.060 V 0.060 V 0.065 V 0.087 V 0.175 V 0.35 V 0.7 V 1.4 V 2.8 V
0x007F 50 Hz 0.142 V 0.142 V 0.144 V 0.145 V 0.170 V 0.305 V 0.380 V 0.7 V 2.3 V 2.8 V
0x0007 1 kHz 0.620 V 0.620 V 0.625 V 0.625 V 0.770 V 1.310 V 1.650 V 2.520 V 7.600 V 7.600 V
0x0000 8 kHz 2.000 V 2.000 V 2.000 V 2.000 V 2.650 V 4.960 V 8.020 V 15.0 V 55.0 V 55.0 V
1
The maximum absolute input voltage allowed is −200 mV to +300 mV relative to ground.
Table 33. Voltage Channel ADC, Typical Output RMS Noise (Referred to ADC Voltage Attenuator Input)
ADCFLT Data Update Rate 28.8 V ADC Input Range
0xBF1D 4 Hz 65 V
0x961F 10 Hz 65 V
0x0007 1 kHz 180 V
0x0000 8 kHz 1600 V
Table 34. Temperature Channel ADC, Typical Output RMS Noise
ADCFLT Data Update Rate 0 V to 1.2 V, ADC Input Range
0xBF1D 4 Hz 2.8 V
0x961F 10 Hz 2.8 V
0x0007 1 kHz 7.5 V
0x0000 8 kHz 55 V