參數(shù)資料
型號(hào)： AD7707BR
廠商： ANALOG DEVICES INC
元件分類： ADC
英文描述： 3 V/5 V, +-10 V Input Range, 1 mW 3-Channel 16-Bit, Sigma-Delta ADC
中文描述： 3-CH 16-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO20
封裝： 0.300 INCH, SOIC-20
文件頁數(shù)： 9/40頁
文件大?。?/td> 316K
代理商： AD7707BR
REV. A
AD7707
–9–
Table II. 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 O/P
Data Rate
Typical Output RMS Noise in
m
V (Peak-to-Peak Resolution in Bits)
Gain of
Gain of
Gain of
2
4
8
–3dB
Frequency 1
Gain of
Gain of
16
Gain of
32
Gain of
64
Gain of
128
MCLK IN = 2.4576 MHz
10Hz
50Hz
60Hz
250Hz
500Hz
2.62Hz
13.1Hz
15.72Hz
65.5Hz
131Hz
1.47 (16)
4.2 (16)
4.9 (16)
104 (13)
572 (10.5) 293 (10.5)
0.95 (16)
2.6 (16)
3 (16)
52 (13)
0.88 (16)
1.6 (16)
1.8 (16)
26 (13)
125 (10.5)
0.55 (16)
1 (16)
1.1 (16)
14 (13)
69 (10.5)
0.42 (16)
0.89 (15.5) 0.94 (15)
1 (15.5)
6.5 (13)
40 (10.5)
0.42 (16)
0.42 (15)
0.9 (14)
0.94 (14)
2.7 (12.5)
10 (10.5)
0.41 (14)
0.9 (13)
0.94 (13)
2.3 (11.5)
5.9 (10)
1 (14.5)
4.1 (12.5)
19 (10.5)
MCLK IN = 1 MHz
4.05Hz
20Hz
25Hz
100Hz
200Hz
1.06Hz
5.24Hz
6.55Hz
26.2Hz
52.4Hz
1.48 (16)
3.9 (16)
5.37 (16)
98.9 (13)
596 (10.5) 298 (10.5)
8.95 (16)
2.46 (16)
3.05 (16)
52.4 (13)
0.87 (16)
1.77 (16)
1.89 (16)
26.1 (13)
133 (10.5)
0.67 (16)
1.19 (16)
1.33 (16)
12.7 (13)
69.3 (10.5) 34.7 (10.5) 16.9 (10.5) 9.67 (10.5) 6.34 (10)
0.41 (16)
0.94 (16)
1.11 (15.5) 1.06 (14.5) 1.04 (13.5) 1.02 (12.5)
6.08 (13)
4.01 (12.5) 2.62 (12.5) 2.33 (11.5)
0.40 (16)
0.93 (15)
0.40 (15)
0.95 (14)
0.40 (14)
0.9 (13)
OUTPUT NOISE FOR LOW LEVEL INPUT CHANNELS (3 V OPERATION)
Table III shows the AD7707 output rms noise and peak-to-peak resolution in unbuffered mode for the selectable notch and –3dB
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 V
REF
of +1.225V and an AV
DD
= 3 V. These numbers are typical and are generated at an analog input voltage of 0V. Table
IV shows the rms noise and peak-to-peak resolution when operating in unbuffered mode. It
is important to note that the peak-to-peak
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.
The numbers given are for bipolar input ranges with a V
REF
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 CLK DIV bit of the Clock Register set to 0. 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 III. 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 O/P
Data Rate
Typical Output RMS Noise in
m
V (Peak-to-Peak Resolution in Bits)
Gain of
Gain of
Gain of
2
4
8
–3dB
Frequency 1
Gain of
Gain of
16
Gain of
32
Gain of
64
Gain of
128
MCLK IN = 2.4576 MHz
10Hz
50Hz
60Hz
250Hz
500Hz
2.62Hz
13.1Hz
15.72Hz
65.5Hz
131Hz
1.60 (16)
3.8 (16)
4.4 (16)
53 (13)
300 (10.5) 138 (10.5)
0.8 (16)
1.9 (16)
2.2 (16)
24 (13)
0.48 (16)
1.1 (16)
1.35 (16)
15 (13)
80 (10.5)
0.29 (16)
0.64 (16)
0.78 (16)
6.8 (13)
34 (10.5)
0.29 (16)
0.60 (15.5) 0.6 (14.5)
0.7 (15)
3.6 (12.5)
18 (10.5)
0.27 (15.5) 0.26 (14.5) 0.26 (13.5)
0.6 (13.5)
0.68 (14.5) 0.64 (13.5) 0.64 (12.5)
2.1 (12.5)
1.5 (12)
8.7 (10.5)
4.8 (10)
0.6 (12.5)
1.3 (11)
3.4 (10)
MCLK IN = 1 MHz
4.05Hz
20Hz
25Hz
100Hz
200Hz
1.06Hz
5.24Hz
6.55Hz
26.2Hz
52.4Hz
1.56 (16)
3.85 (16)
4.56 (16)
45.7 (13)
262 (10.5) 125 (10.5)
0.88 (16)
2.02 (16)
2.4 (16)
22 (13)
0.52 (16)
1.15 (16)
1.4 (16)
13.7 (13)
66 (10.5)
0.3 (16)
0.74 (16)
0.79 (16)
5.27 (13)
32.4 (10.5) 18.4 (10.5) 8.6 (10.5)
0.28 (16)
0.63 (15.5) 0.57 (14.5) 0.61 (13.5) 0.58 (12.5)
0.68 (15)
0.66 (14.5) 0.64 (13.5) 0.64 (12.5)
2.64 (13)
2 (12.5)
0.27 (15.5) 0.27 (14.5) 0.26 (13.5)
1.59 (12)
4.64 (10.5) 3.3 (10)
1.4 (11)
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