ADUCM360 AD [Analog Devices], ADUCM360 Datasheet - Page 10

• Manufacturer Part Number: ADUCM360
• Description: Low Power Precision Analog Microcontroller
• Manufacturer: AD [Analog Devices]

ADuCM360/ADuCM361
NOISE RESOLUTION OF PRIMARY AND AUXILIARY ADCS
Table 2: RMS Noise (µV) vs. Gain and Output Update Rate
(Using an Internal Reference (1.2V) Both ADCs)
Update Rate (Hz)
3.75 (Chop On)
ADCxFLT = 0x8D7C
30 (Chop Off)
ADCxFLT = 0x007E
50 (Chop Off)
ADCxFLT = 0x007D
100 (Chop Off)
ADCxFLT = 0x004D
488 (Chop Off Sinc4)
ADCxFLT = 0x100F
976 (Chop Off Sinc4)
ADCxFLT = 0x1007
1953 (Chop Off Sinc4)
ADCxFLT = 0x1003
3906 (Chop Off Sinc4)
ADCxFLT = 0x1001
Table 3: Typical Output RMS Effective Number of Bits in Normal Mode
(Using an Internal Reference (1.2V), Both ADCs, Peak-to-Peak Bits in Parentheses)
ADC
Register
Status
Chop On
Sinc3
Chop Off
Sinc3
Chop Off
Sinc3
Chop Off
Sinc3
Chop Off
Sinc4
Chop Off
Sinc4
Chop Off
Sinc4
Chop Off
Sinc4
Data
Update
Rate
3.75 Hz
30 Hz
50 Hz
100 Hz
488 Hz
976 Hz
1953
Hz
3906
Hz
±1.0 V
(PGA = 1)
21.1
(18.4p-p)
20.1
(17.4p-p)
19.3
(16.6p-p)
18.7
(16p-p)
17.9
(15.2p-p)
17.4
(14.7p-p)
16.9
(14.2p-p)
15.1
(12.4p-p)
Gain of 1
1.05
2.1
3.7
5.45
10
13.5
19.3
67.0
±500 mV
(PGA = 2)
21.3
(18.6p-p)
19.7
(17p-p)
19.5
(16.8p-p)
18.9
(16.2p-p)
18
(15.2p-p)
17.5
(14.8p-p)
16.9
(14.2p-p)
15
(12.3p-p)
Input Voltage Noise (mV)
Gain of 2
0.45
1.37
1.6
2.41
4.7
6.5
10
36
±250 mV
(PGA = 4)
21.3
(18.6p-p)
19.8
(17.1p-p)
19.5
(16.8p-p)
19
(16.3p-p)
18.1
(15.3p-p)
17.5
(14.8p-p)
17
(14.3p-p)
15.1
(12.4p-p)
Gain of 4
0.23
0.63
0.83
1.13
2.2
3.3
4.7
16.6
Rev. Pr R Page 10 of 21
±125 mV
(PGA = 8)
21.1
(18.4p-p)
19.6
(16.9p-p)
19.3
(16.6p-p)
18.9
(16.2p-p)
17.8
(15.1p-p)
17.4
(14.7p-p)
16.8
(14p-p)
15.1
(12.4p-p)
Gain of 8
0.135
0.37
0.47
0.63
1.3
1.7
2.6
8.8
Gain of 16
0.072
0.22
0.29
0.38
0.79
1.1
1.55
4.9
±62.5 mV
(PGA = 16)
21
(18.3p-p)
19.4
(16.7p-p)
19
(16.3p-p)
18.6
(16.1p-p)
17.5
(14.8p-p)
17.1
(14.3p-p)
16.6
(13.8p-p)
14.9
(12.2p-p)
Preliminary Technical Data
Gain of 32
0.064
0.2
0.24
0.32
0.67
0.91
1.3
2.68
±31.25 mV
(PGA = 32)
20.2
(17.4p-p)
18.5
(15.8p-p)
18.3
(15.5p-p)
17.8
(15.1p-p)
16.8
(14p-p)
16.3
(13.6p-p)
15.8
(13.1p-p)
14.8
(12p-p)
Gain of 64
0.055
0.16
0.21
0.27
0.58
0.74
1.15
1.76
±15.625 mV
(PGA = 64)
19.4
(16.7p-p)
17.8
(15.1p-p)
17.4
(14.7p-p)
17.1
(14.4p-p)
16
(13.3p-p)
15.6
(12.9p-p)
15
(13.1p-p)
14.4
(11.7p-p)
Gain of 128
0.052
0.155
0.2
0.25
0.57
0.7
1.0
1.4
±7.8125 mV
(PGA = 128)
18.5
(15.7p-p)
16.9
(14.2p-p)
16.5
(13.8p-p)
16.2
(13.5p-p)
15
(12.3p-p)
14.7
(12p-p)
14.2
(11.5p-p)
13.7
(11p-p)