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AD7707BRU Scheda tecnica(PDF) 11 Page - Analog Devices

Il numero della parte AD7707BRU
Spiegazioni elettronici  3 V/5 V, -10 V Input Range, 1 mW 3-Channel 16-Bit, Sigma-Delta ADC
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Produttore elettronici  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

AD7707BRU Scheda tecnica(HTML) 11 Page - Analog Devices

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REV. A
AD7707
–11–
Table VI. Output RMS Noise/ Peak-to-Peak Resolution vs. Gain and Output Update Rate @ +5 V
AIN3 Buffered Mode Only
Filter First
10 V Range
5 V Range
0 V to +10 V Range
0 to +5 V Range
Notch and O/P
–3 dB
RMS Noise P-P (Bits)
RMS Noise P-P (Bits)
RMS Noise P-P (Bits)
RMS Noise P-P (Bits)
Data Rate
Frequency
( V)
Resolution ( V)
Resolution ( V)
Resolution
( V)
Resolution
MCLK IN = 2.4576 MHz
10 Hz
2.62 Hz
7.4
16
5.2
16
7.4
16
5.2
16
50 Hz
13.1 Hz
22.2
16
14.3
16
22.2
16
14.3
16
60 Hz
15.72 Hz
26.6
16
15.85
16
26.6
16
15.85
16
250 Hz
65.5 Hz
475
13
187
13
475
12
187
12
500 Hz
131 Hz
2423
10.5
1097
10.5
2423
9.5
1097
9.5
MCLK IN = 1 MHz
4.05 Hz
1.06 Hz
7.63
16
5.45
16
7.63
16
5.45
16
20 Hz
5.24 Hz
20.25
16
13.3
16
20.25
16
13.3
16
25 Hz
6.55 Hz
23.5
16
14.6
16
23.5
16
14.6
15.5
100 Hz
26.2 Hz
377
13
210
13
377
12
210
12
200 Hz
52.4 Hz
2226
10.5
1132
10.5
2226
9.5
1132
9.5
OUTPUT NOISE FOR HIGH LEVEL INPUT CHANNEL AIN3 (5 V OPERATION)
Table VII shows the AD7707 output rms noise and peak-to-peak resolution 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
±5 V, 0 V to +5 V and 0 V to +10 V
ranges with a VREF of +1.225 V, HBIAS = 1.225 V, HICOM = AGND and AVDD = 3 V. These numbers are typical and are gener-
ated at an analog input voltage of 0 V for unbuffered mode of operation. The above operating ranges are only achievable in unbuf-
fered mode when operating at 3 V due to common-mode limitations on the input amplifier. It is important to note that these numbers
represent the resolution for which there will be no code flicker. They are not calculated based on rms noise but on peak-to-peak noise. Operating
at a gain of 1 in unipolar mode provides a range of 0 V to +10 V. Operating the high level channel with a gain of 2 in bipolar mode
provides a
±5 V operating range. Operating at a gain of 2 in unipolar mode provides an operating range of 0 V to +5 V. 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 the tables are given for the bipolar input ranges. For the
unipolar ranges the rms noise numbers will be 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 VII. Output RMS Noise/ Peak-to-Peak Resolution vs. Gain and Output Update Rate @ +3 V
AIN3 Unbuffered Mode Only
Filter First
0 V to +10 V Range
5 V Range
0 to +5 V Range
Notch and O/P
–3 dB
RMS Noise
P-P (Bits)
RMS Noise
P-P (Bits)
RMS Noise
P-P (Bits)
Data Rate
Frequency
( V)
Resolution
( V)
Resolution
( V)
Resolution
MCLK IN = 2.4576 MHz
10 Hz
2.62 Hz
12.4
16
7.02
16
7.02
16
50 Hz
13.1 Hz
30.35
16
16.4
16
16.4
15.5
60 Hz
15.72 Hz
34.55
16
19.13
16
19.13
15
250 Hz
65.5 Hz
498
12.5
204
13
204
12
500 Hz
131 Hz
2266
10.5
1151
10.5
1151
9.5
MCLK IN = 1 MHz
4.05 Hz
1.06 Hz
13.9
16
7.3
16
7.3
16
20 Hz
5.24 Hz
32.2
16
17.4
16
17.4
15
25 Hz
6.55 Hz
33.4
16
18.57
16
18.57
15
100 Hz
26.2 Hz
430
13
200
13
200
12
200 Hz
52.4 Hz
2207
10.5
1048
10.5
1048
9.5


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