AD7715_17 datasheet(18/41 Pages) AD | 16-Bit, Sigma-Delta ADC

Part #	AD7715

Description	16-Bit, Sigma-Delta ADC

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Data Sheet

AD7715

Rev. E | Page 17 of 40

AD7715-3

Table 19 shows the AD7715-3 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 1.25 V. These numbers are

typical and are generated at an analog input voltage of 0 V with

the part used in unbuffered mode (BUF bit of the setup register

= 0). Table 20 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 1.25 V and for the

BUF bit of the setup register = 0. These numbers are typical,

are generated at an analog input voltage of 0 V and are rounded

to the nearest LSB.

Meanwhile, Table 21 and Table 22 show rms noise and peak-

to-peak resolution respectively with the AD7715-3 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 19. Output RMS Noise vs. Gain and Output Update Rate for AD7715-3 (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

3.0

1.7

0.7

0.65

60 Hz

25 Hz

15.72 Hz

6.55 Hz

3.4

2.1

0.7

250 Hz

100 Hz

65.5 Hz

26.2 Hz

45

20

2.2

1.6

500 Hz

200 Hz

131 Hz

52.4 Hz

270

135

9.7

3.3

Table 20. Peak-to-Peak Resolution vs. Gain and Output Update Rate for AD7715-3 (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

12

60 Hz

25 Hz

15.72 Hz

6.55 Hz

16

14

12

250 Hz

100 Hz

65.5 Hz

26.2 Hz

13

11

500 Hz

200 Hz

131 Hz

52.4 Hz

11

10

Table 21. Output RMS Noise vs. Gain and Output Update Rate for AD7715-3 (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

4.5

2.4

0.9

60 Hz

25 Hz

15.72 Hz

6.55 Hz

5.1

2.9

0.9

1.0

250 Hz

100 Hz

65.5 Hz

26.2 Hz

50

25

2.6

2

500 Hz

200 Hz

131 Hz

52.4 Hz

270

135

9.7

3.3

Table 22. Peak-to-Peak Resolution vs. Gain and Output Update Rate for AD7715-3 (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

14

12

60 Hz

25 Hz

15.72 Hz

6.55 Hz

16

14

12

250 Hz

100 Hz

65.5 Hz

26.2 Hz

13

12

11

500 Hz

200 Hz

131 Hz

52.4 Hz

10

11

10

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