AD7715_17 datasheet(17/41 Pages) AD | 16-Bit, Sigma-Delta ADC

Part No.	AD7715

Description	16-Bit, Sigma-Delta ADC

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AD7715

Data Sheet

Rev. E | Page 16 of 40

OUTPUT NOISE

AD7715-5

Table 15 shows the AD7715-5 output rms noise for the selecta-

ble notch and −3 dB frequencies for the part, as selected by FS1

and FS0 of the setup register. The numbers given are for the

bipolar input ranges with a VREF of 2.5 V. These numbers are

typical and are generated at a differential analog input voltage

of 0 V with the part used in unbuffered mode (BUF bit of the

setup register = 0). Table 16 meanwhile shows the output peak-

to-peak noise for the selectable notch and −3 dB frequencies

for the part. It is important to note that these numbers represent

the resolution for which there is no code flicker. They are not

calculated based on rms noise but on peak-to-peak noise. The

numbers given are for the bipolar input ranges with a VREF of

2.5 V and for the BUF bit of the setup register = 0. These num-

bers are typical, are generated at an analog input voltage of 0 V

and are rounded to the nearest LSB.

Meanwhile, Table 17 and Table 18 show rms noise and peak-

to-peak resolution respectively with the AD7715-5 operating

under the same conditions as above except that now the part is

operating in buffered mode (BUF bit of the setup register = 1).

Table 15. Output RMS Noise vs. Gain and Output Update Rate for AD7715-5 (Unbuffered Mode)

Filter First Notch and Output Data Rate

−3 dB Frequency

Typical Output RMS Noise (µV)

MCLK IN =

2.4576 MHz

1 MHz

2.4576 MHz

1 MHz

Gain = 1

Gain = 2

Gain = 32

Gain = 128

50 Hz

20 Hz

13.1 Hz

5.24 Hz

3.8

1.9

0.6

0.52

60 Hz

25 Hz

15.72 Hz

6.55 Hz

4.8

2.4

0.6

0.62

250 Hz

100 Hz

65.5 Hz

26.2 Hz

103

45

3.0

1.6

500 Hz

200 Hz

131 Hz

52.4 Hz

530

250

18

5.5

Table 16. Peak-to-Peak Resolution vs. Gain and Output Update Rate for AD7715-5 (Unbuffered Mode)

Filter First Notch and Output Data Rate

−3 dB Frequency

Typical Peak-to-Peak Resolution in Bits

MCLK IN =

2.4576 MHz

1 MHz

2.4576 MHz

1 MHz

Gain = 1

Gain = 2

Gain = 32

Gain = 128

50 Hz

20 Hz

13.1 Hz

5.24 Hz

16

14

60 Hz

25 Hz

15.72 Hz

6.55 Hz

16

13

250 Hz

100 Hz

65.5 Hz

26.2 Hz

13

12

500 Hz

200 Hz

131 Hz

52.4 Hz

10

Table 17. Output RMS Noise vs. Gain and Output Update Rate for AD7715-5 (Buffered Mode)

Filter First Notch and Output Data Rate

−3 dB Frequency

Typical Output RMS Noise (µV)

MCLK IN =

2.4576 MHz

1 MHz

2.4576 MHz

1 MHz

Gain = 1

Gain = 2

Gain = 32

Gain = 128

50 Hz

20 Hz

13.1 Hz

5.24 Hz

4.3

2.2

0.9

60 Hz

25 Hz

15.72 Hz

6.55 Hz

5.1

3.1

1.0

250 Hz

100 Hz

65.5 Hz

26.2 Hz

103

50

3.9

2.1

500 Hz

200 Hz

131 Hz

52.4 Hz

550

280

18

6

Table 18. Peak-to-Peak Resolution vs. Gain and Output Update Rate for AD7715-5 (Buffered Mode)

Filter First Notch and Output Data Rate

−3 dB Frequency

Typical Peak-to-Peak Resolution in Bits

MCLK IN =

2.4576 MHz

1 MHz

2.4576 MHz

1 MHz

Gain = 1

Gain = 2

Gain = 32

Gain = 128

50 Hz

20 Hz

13.1 Hz

5.24 Hz

16

15

13

60 Hz

25 Hz

15.72 Hz

6.55 Hz

16

15

13

250 Hz

100 Hz

65.5 Hz

26.2 Hz

13

12

500 Hz

200 Hz

131 Hz

52.4 Hz

10

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