AD4112

Data Sheet

Rev. A | Page 18 of 58

NOISE PERFORMANCE AND RESOLUTION

Table 6 to Table 9 show the rms noise, peak-to-peak noise,

effective resolution, and the noise free (peak-to-peak)

resolution of the AD4112 for various ODRs. These values are

typical and are measured with an external 2.5 V reference and

with the ADC continuously converting on multiple channels.

The values in Table 6 and Table 8 are generated for the ±10 V

voltage input range, with a differential input voltage of 0 V.

The values in Table 7 and Table 9 are generated for the 0 mA

to 20 mA input range, with an input current of 0 mA. It is

important to note that the peak-to-peak resolution is calculated

based on the peak-to-peak noise. The peak-to-peak resolution

represents the resolution for which there is no code flicker.

Table 6. ±10 V Voltage Input RMS Noise Resolution vs. ODR Using a Sinc5 + Sinc1 Filter

Default Output Data Rate

(SPS); SING_CYC = 0 and

Single Channel Enabled

Output Data Rate (SPS per

Channel); SING_CYC = 1 or

Multiple Channels Enabled

Settling

Notch

Frequency

(Hz)

Noise

Effective

Resolution

(Bits)

Noise

(µV p-p)

Peak-to-Peak

Resolution

(Bits)

31,250

6211

161 µs

31,250

106

17.5

750

14.7

15,625

5181

193 µs

15,625

94

17.7

580

15.1

10,417

4444

225 µs

10,417

82

17.9

512

15.3

5208

3115

321 µs

5208

62

18.3

372

15.7

2597

2597

385 µs

3906

47

18.7

312

16.0

1007

1007

993 µs

1157

27

19.5

190

16.7

504

504

1.99 ms

539

21

19.9

140

17.1

381

381

2.63 ms

401

17

20.2

92

17.7

200.3

200.3

4.99 ms

206

13

20.6

62

18.3

100.2

100.2

9.99 ms

102

8

21.3

45

18.8

59.52

59.52

16.8 ms

59.98

7

21.4

33

19.2

49.68

49.68

20.13 ms

50

7

21.4

33

19.2

20

20.01

49.98 ms

20

4

22.3

22

19.8

16.67

16.63

60.13 ms

16.67

4

22.3

21

19.9

10

10

100 ms

10

3.7

22.4

18

20.1

5

5

200 ms

5

3.4

22.5

17

20.2

2.5

2.5

400 ms

2.5

2.4

23

12

20.7

1.25

1.25

800 ms

1.25

2.3

23.1

11

20.8

1

The settling time is rounded to the nearest microsecond, which is reflected in the output data rate and channel switching rate. Channel switching rate = 1 ÷ settling time.

2

Based on 1000 samples for data rates ≥ 381 SPS per channel, based on 100 samples for data rates ≤ 200.3 SPS per channel.

Table 7. 0 mA to 20 mA Current Input Noise and Resolution vs. Output Data Rate Using a Sinc5 + Sinc1 Filter

Default Output Data Rate

(SPS); SING_CYC = 0 and

Single Channel Enabled

Output Data Rate (SPS per

Channel); SING_CYC = 1 or

Multiple Channels Enabled

Settling

Notch

Frequency

(Hz)

Noise

Effective

Resolution

(Bits)

Noise

(nA p-p)

Peak-to-Peak

Resolution

(Bits)

31,250

6211

161 µs

31,250

155

17.0

1100

14.2

15,625

5181

193 µs

15,625

136

17.2

920

14.4

10,417

4444

225 µs

10,417

113

17.4

720

14.8

5208

3115

321 µs

5208

84

17.9

580

15.1

2597

2597

385 µs

3906

75

18.0

480

15.3

1007

1007

993 µs

1157

43

18.8

220

16.5

504

503.8

1.99 ms

539

29

19.4

150

17.0

381

381

2.63 ms

401

21

19.9

125

17.3

200.3

200.3

4.99 ms

206

18

20.1

95

17.7

100.2

100.2

9.99 ms

102

13

20.6

71

18.1

59.52

59.52

16.8 ms

59.98

10

20.9

48

18.7

49.68

49.68

20.13 ms

50

9

21.1

41

18.9

20

20.01

49.98 ms

20

6

21.7

30

19.3

16.67

16.63

60.13 ms

16.67

5.3

21.8

23

19.7

10

10

100 ms

10

4.6

22.1

18

20.1

5

5

200 ms

5

3

22.7

12

20.7

2.5

2.5

400 ms

2.5

2.8

22.8

12

20.7

1.25

1.25

800 ms

1.25

2.7

22.8

6

21.7

1

The settling time is rounded to the nearest microsecond, which is reflected in the output data rate and channel switching rate. Channel switching rate = 1 ÷ settling time.

2

Based on 1000 samples for data rates ≥ 381 SPS per channel, based on 100 samples for data rates ≤ 200.3 SPS per channel.