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| 型号： | AD7707BRZ-REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 8/52页 |
| 文件大小： | 0K |
| 描述： | IC ADC 16BIT 3CHAN 20SOIC |
| 标准包装： | 1,000 |
| 位数： | 16 |
| 采样率（每秒）： | 500 |
| 数据接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 1mW |
| 电压电源： | 模拟和数字 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 20-SOIC W |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 1 个单端，单极；1 个单端，双极；2 个伪差分，单极；2 个伪差分，双极 |
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AD7707
Rev. B | Page 16 of 52
OUTPUT NOISE FOR HIGH LEVEL INPUT CHANNEL
AIN3 (5 V OPERATION)
Table 11 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 ±10 V, ±5 V, 0 to
5 V and 0 V to 10 V ranges with a VREF of 2.5 V, VBIAS = 2.5 V,
HICOM = AGND, and AVDD = 5 V. These numbers are typical
and are generated at an analog input voltage of 0 V. Table 12
meanwhile shows the output rms noise and peak-to-peak
resolution in buffered mode. 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. Operating the high level channel with a
gain of 2 in bipolar mode gives an operating range of ±10 V.
Operating at a gain of 2 in unipolar mode gives a range of 0 V
to +10 V. Operating the high level channel with a gain of 4 in
bipolar mode gives the ±5 V operating range. Operating at a gain
of 4 in unipolar mode gives an operating range of 0 V to 5 V.
Noise for all input ranges is shown in Output Noise For High Level
Input Channel, AIN3 section. 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 modula-
tor. 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
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 11. Output RMS Noise/Peak-to-Peak Resolution vs. Gain and Output Update Rate @ 5 V AIN3 Unbuffered Mode Only
Filter First Notch
and Output Data
Rate
3 dB
Frequency
±10 V Range
±5 V Range
0 V to 10 V Range
0 V to 5 V Range
RMS Noise
(μV)
P-P (Bits)
Resolution
RMS Noise
(μV)
P-P (Bits)
Resolution
RMS Noise
(μV)
P-P (Bits)
Resolution
RMS
Noise (μV)
P-P (Bits)
Resolution
MCLK IN = 2.4576 MHz
10 Hz
2.62 Hz
5.10
16
3.52
16
5.10
16
3.52
16
50 Hz
13.1 Hz
15.82
16
9.77
16
15.82
16
9.77
16
60 Hz
15.72 Hz
20.36
16
12.29
16
20.36
16
12.29
16
250 Hz
65.5 Hz
430
13
212
13
430
12
212
12
500 Hz
131 Hz
2350
10
1287
10
2350
9
1287
9
MCLK IN = 1 MHz
4.05 Hz
1.06 Hz
5.13
16
3.53
16
5.13
16
3.53
16
20 Hz
5.24 Hz
18.9
16
13.25
16
18.9
16
13.25
16
25 Hz
6.55 Hz
23.7
16
15.3
16
23.7
16
15.3
15.5
100 Hz
26.2 Hz
406
13
174
13
406
12
174
12
200 Hz
52.4 Hz
2184
10.5
1144
10.5
2184
9.5
1144
9.5
Table 12. Output RMS Noise/Peak-to-Peak Resolution vs. Gain and Output Update Rate @ 5 V AIN3 Buffered Mode Only
Filter First Notch
and Output Data
Rate
3 dB
Frequency
±10 V Range
±5 V Range
0 V to 10 V Range
0 to 5 V Range
RMS Noise
P-P (Bits)
RMS Noise
P-P (Bits)
RMS Noise
P-P (Bits)
RMS Noise
P-P (Bits)
(μV)
Resolution
(μV)
Resolution
(μV)
Resolution
(μV)
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
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