AD7707_17 datasheet(15/53 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 14 of 52

OUTPUT NOISE

OUTPUT NOISE FOR LOW LEVEL INPUT

CHANNELS (5 V OPERATION)

Table 7 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 2.5 V and AVDD = 5 V. These

numbers are typical and are generated at an analog input voltage of

0 V. Table 8 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 2.5 V. 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

implementation 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

frequency. 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 7 and Table 8 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 one bit of resolution.

Table 7. Output RMS Noise/Peak-to-Peak Resolution vs. Gain and Output Update Rate @ 5 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

1.2 (16)

0.7 (16)

0.54 (16)

0.28 (16)

0.28 (15.5)

0.27 (14.5)

50 Hz

13.1 Hz

3.6 (16)

2.1 (16)

1.25 (16)

0.89 (16)

0.62 (16)

0.60 (15.5)

0.56 (14.5)

0.56 (13.5)

60 Hz

15.72 Hz

4.7 (16)

2.6 (16)

1.5 (16)

0.94 (16)

0.73 (16)

0.68 (15.5)

0.66 (14.5)

0.63 (13.5)

250 Hz

65.5 Hz

95 (13)

65 (13)

23.4 (13)

11.6 (13)

6.5 (13)

3.4 (13)

2.1 (12.5)

1.5 (12)

500 Hz

131 Hz

600 (10.5)

316 (10.5)

138 (10.5)

71 (10.5)

38 (10.5)

18 (10.5)

10 (10)

5.7 (10)

MCLK IN = 1 MHz

4.05 Hz

1.06 Hz

1.19 (16)

0.69 (16)

0.71 (16)

0.63 (16)

0.27 (16)

0.26 (15.5)

0.24 (15)

20 Hz

5.24 Hz

3.68 (16)

2.18 (16)

1.19 (16)

0.94 (16)

0.6 (16)

0.6 (15.5)

0.56 (14.5)

0.56 (13.5)

25 Hz

6.55 Hz

4.78 (16)

2.66 (16)

1.51 (16)

1.07 (16)

0.7 (16)

0.67 (15.5)

0.66 (14.5)

0.65 (13.5)

100 Hz

26.2 Hz

100 (13)

50.1 (13)

23.5 (13)

11.9 (13)

5.83 (13)

3.64 (13)

2.16 (12.5)

1.5 (12)

200 Hz

52.5 Hz

543 (10.5)

318 (10.5)

132 (10.5)

68.1 (10.5)

33.1 (10.5)

17.6 (10.5)

9.26 (10.5)

6.13 (10)

Table 8. Output RMS Noise/Peak-to-Peak Resolution vs. Gain and Output Update Rate @ 5 V AIN1 and AIN2 Buffered Mode Only

Filter First Notch

and Output Data

Rate

−3 dB

Frequency

Typical Output RMS oise 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

1.47 (16)

0.95 (16)

0.88 (16)

0.55 (16)

0.42 (16)

0.42 (15)

0.41 (14)

50 Hz

13.1 Hz

4.2 (16)

2.6 (16)

1.6 (16)

1 (16)

0.89 (15.5)

0.94 (15)

0.9 (14)

0.9 (13)

60 Hz

15.72 Hz

4.9 (16)

3 (16)

1.8 (16)

1.1 (16)

1 (15.5)

1 (14.5)

0.94 (14)

0.94 (13)

250 Hz

65.5 Hz

104 (13)

52 (13)

26 (13)

14 (13)

6.5 (13)

4.1 (12.5)

2.7 (12.5)

2.3 (11.5)

500 Hz

131 Hz

572 (10.5)

293 (10.5)

125 (10.5)

69 (10.5)

40 (10.5)

19 (10.5)

10 (10.5)

5.9 (10)

MCLK IN = 1 MHz

4.05 Hz

1.06 Hz

1.48 (16)

8.95 (16)

0.87 (16)

0.67 (16)

0.41 (16)

0.40 (16)

0.40 (15)

0.40 (14)

20 Hz

5.24 Hz

3.9 (16)

2.46 (16)

1.77 (16)

1.19 (16)

0.94 (16)

0.93 (15)

0.95 (14)

0.9 (13)

25 Hz

6.55 Hz

5.37 (16)

3.05 (16)

1.89 (16)

1.33 (16)

1.11 (15.5)

1.06 (14.5)

1.04 (13.5)

1.02 (12.5)

100 Hz

26.2 Hz

98.9 (13)

52.4 (13)

26.1 (13)

12.7 (13)

6.08 (13)

4.01 (12.5)

2.62 (12.5)

2.33 (11.5)

200 Hz

52.4 Hz

596 (10.5)

298 (10.5)

133 (10.5)

69.3 (10.5)

34.7 (10.5)

16.9 (10.5)

9.67 (10.5)

6.34 (10)

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