AD7707_17 datasheet(16/53 Pages) AD

Part #	AD7707

Description	3-Channel 16-Bit, Sigma-Delta ADC

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Manufacturer	AD [Analog Devices]

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AD7707

Rev. B | Page 15 of 52

OUTPUT NOISE FOR LOW LEVEL INPUT

CHANNELS (3 V OPERATION)

Table 9 shows the AD7707 output rms noise and peak-to-peak

resolution in unbuffered mode for the selectable notch and

−3 dB frequencies for the part, as selected by FS0, FS1, and FS2

of the clock register. The numbers given are for the bipolar

input ranges with a VREF of 1.225 V and an AVDD = 3 V. These

numbers are typical and are generated at an analog input

voltage of 0 V. Table 10 shows the rms noise and peak-to-peak

resolution when operating in buffered mode. It is important to

note that the peak-to-peak 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 bipolar input ranges with a VREF of 1.225 V and for either

buffered or unbuffered mode. These numbers are typical and

are rounded to the nearest LSB. The numbers apply for the

CLKDIV bit of the clock register set to 0. The output noise

comes from two sources. The first is the electrical noise in the

semiconductor devices (device noise) used in the implementa-

tion of the modulator. Secondly, when the analog input is

converted into the digital domain, quantization noise is added.

The device noise is at a low level and is independent of fre-

quency. The quantization noise starts at an even lower level but

rises rapidly with increasing frequency to become the dominant

noise source. The numbers in Table 9 and Table 10 are given

for the bipolar input ranges. For the unipolar ranges, the rms

noise numbers are the same as the bipolar range but the peak-

to-peak resolution is now based on half the signal range, which

effectively means losing 1 bit of resolution.

Table 9. Output RMS Noise/Peak-to-Peak Resolution vs. Gain and Output Update Rate @ 3 V AIN1 and AIN2 Unbuffered Mode Only

Filter First Notch

and Output Data

Rate

−3 dB

Frequency

Typical Output RMS Noise in μV (Peak-to-Peak Resolution in Bits)

Gain of 1

Gain of 2

Gain of 4

Gain of 8

Gain of 16

Gain of 32

Gain of 64

Gain of 128

MCLK IN = 2.4576 MHz

10 Hz

2.62 Hz

1.60 (16)

0.8 (16)

0.48 (16)

0.29 (16)

0.27 (15.5)

0.26 (14.5)

0.26 (13.5)

50 Hz

13.1 Hz

3.8 (16)

1.9 (16)

1.1 (16)

0.64 (16)

0.60 (15.5)

0.6 (14.5)

0.6 (13.5)

0.6 (12.5)

60 Hz

15.72 Hz

4.4 (16)

2.2 (16)

1.35 (16)

0.78 (16)

0.7 (15)

0.68 (14.5)

0.64 (13.5)

0.64 (12.5)

250 Hz

65.5 Hz

53 (13)

24 (13)

15 (13)

6.8 (13)

3.6 (12.5)

2.1 (12.5)

1.5 (12)

1.3 (11)

500 Hz

131 Hz

300 (10.5)

138 (10.5)

80 (10.5)

34 (10.5)

18 (10.5)

8.7 (10.5)

4.8 (10)

3.4 (10)

MCLK IN = 1 MHz

4.05 Hz

1.06 Hz

1.56 (16)

0.88 (16)

0.52 (16)

0.3 (16)

0.28 (16)

0.27 (15.5)

0.27 (14.5)

0.26 (13.5)

20 Hz

5.24 Hz

3.85 (16)

2.02 (16)

1.15 (16)

0.74 (16)

0.63 (15.5)

0.57 (14.5)

0.61 (13.5)

0.58 (12.5)

25 Hz

6.55 Hz

4.56 (16)

2.4 (16)

1.4 (16)

0.79 (16)

0.68 (15)

0.66 (14.5)

0.64 (13.5)

0.64 (12.5)

100 Hz

26.2 Hz

45.7 (13)

22 (13)

13.7 (13)

5.27 (13)

2.64 (13)

2 (12.5)

1.59 (12)

1.4 (11)

200 Hz

52.4 Hz

262 (10.5)

125 (10.5)

66 (10.5)

32.4 (10.5)

18.4 (10.5)

8.6 (10.5)

4.64 (10.5)

3.3 (10)

Table 10. Output RMS Noise/Peak-to-Peak Resolution vs. Gain and Output Update Rate @ 3 V AIN1 and AIN2 Buffered Mode Only

Filter First Notch

and Output Data

Rate

−3 dB

Frequency

Typical Output RMS Noise in μV (Peak-to-Peak Resolution in Bits)

Gain of 1

Gain of 2

Gain of 4

Gain of 8

Gain of 16

Gain of 32

Gain of 64

Gain of 128

MCLK IN = 2.4576 MHz

10 Hz

2.62 Hz

1.80 (16)

1 (16)

0.7 (16)

0.41 (16)

0.41 (15)

0.41 (14)

0.41 (13)

50 Hz

13.1 Hz

4.1 (16)

2.4 (16)

1.5 (16)

1 (15.5)

0.91 (15)

0.89 (14)

0.86 (13)

0.83 (12)

60 Hz

15.72 Hz

5.1 (16)

3 (16)

1.8 (16)

1.1 (15.5)

0.94 (14.5)

0.94 (13.5)

0.99 (13)

0.99 (11.5)

250 Hz

65.5 Hz

50 (13)

27 (13)

12.3 (13)

6.4 (13)

4 (12.5)

2.7 (12.5)

2.2 (11.5)

1.8 (11)

500 Hz

131 Hz

275 (10.5)

125 (10.5)

80 (10.5)

39 (10.5)

16 (10.5)

8.9 (10.5)

5.2 (10)

4.2 (9.5)

MCLK IN = 1 MHz

4.05 Hz

1.06 Hz

1.75 (16)

1.18 (16)

0.67 (16)

0.44 (16)

0.41 (16)

0.44 (15)

0.43 (14)

0.43 (13)

20 Hz

5.24 Hz

4.21 (16)

2.5 (16)

1.48 (16)

1 (15.5)

0.94 (15)

0.96 (14)

0.89 (13)

0.86 (12)

25 Hz

6.55 Hz

5.15 (16)

2.8 (16)

1.8 (16)

1.15 (15.5)

1 (14.5)

1.02 (13.5)

0.96 (13)

1.03 (11.5)

100 Hz

26.2 Hz

46.1 (13)

24.3 (13)

13.6 (13)

6.71 (13)

4.1 (12.5)

2.54 (12.5)

2.3 (11.5)

2.15 (10.5)

200 Hz

52.4 Hz

282 (10.5)

123 (10.5)

66 (10.5)

35.3 (10.5)

14.8 (10.5)

9.91 (10.5)

5.48 (10)

4.01 (9.5)

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