ADuC7033
ADC NOISE PERFORMANCE TABLES
Table 32, Table 33, and Table 34 list the output rms noise in μV 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 μV rms.
Table 32. Current Channel ADC, Normal Power Mode, Typical Output RMS Noise
ADCFLT
Data
Update
Rate
±2.3 mV
(512)
±4.6 mV
(256)
±9.375 mV
(128)
±18.75 mV
(64)
ADC Input Range
±37.5 mV ±75 mV
(32)
(16)
0xBF1D 4 Hz
0.040 μV 0.040 μV 0.043 μV 0.045 μV 0.087 μV 0.175 μV
0x961F 10 Hz 0.060 μV 0.060 μV 0.060 μV 0.065 μV 0.087 μV 0.175 μV
0x007F 50 Hz 0.142 μV 0.142 μV 0.144 μV 0.145 μV 0.170 μV 0.305 μV
0x0007 1 kHz 0.620 μV 0.620 μV 0.625 μV 0.625 μV 0.770 μV 1.310 μV
0x0000 8 kHz 2.000 μV 2.000 μV 2.000 μV 2.000 μV 2.650 μV 4.960 μV
1 The maximum absolute input voltage allowed is −200 mV to +300 mV relative to ground.
±150 mV
(8)
0.35 μV
0.35 μV
0.380 μV
1.650 μV
8.020 μV
±300 mV
(41)
0.7 μV
0.7 μV
0.7 μV
2.520 μV
15.0 μV
±600 mV
(21)
1.4 μV
1.4 μV
2.3 μV
7.600 μV
55.0 μV
±1.2 V
(11)
2.8 μV
2.8 μV
2.8 μV
7.600 μV
55.0 μV
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 μV
0x961F
10 Hz
65 μV
0x0007
1 kHz
180 μV
0x0000
8 kHz
1600 μV
Table 34. Temperature Channel ADC, Typical Output RMS Noise
ADCFLT
Data Update Rate
0xBF1D
4 Hz
0x961F
10 Hz
0x0007
1 kHz
0x0000
8 kHz
0 V to 1.2 V, ADC Input Range
2.8 μV
2.8 μV
7.5 μV
55 μV
Rev. B | Page 47 of 140