參數(shù)資料
型號： AD7707BRU-REEL7
廠商： Analog Devices Inc
文件頁數(shù)： 43/52頁
文件大?。?/td> 0K
描述： IC ADC 16BIT 3CH 20-TSSOP T/R
標準包裝： 1,000
位數(shù)： 16
采樣率（每秒）： 500
數(shù)據(jù)接口： DSP，MICROWIRE?，QSPI?，串行，SPI?
轉(zhuǎn)換器數(shù)目： 1
功率耗散（最大）： 1mW
電壓電源： 模擬和數(shù)字
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 20-TSSOP（0.173"，4.40mm 寬）
供應(yīng)商設(shè)備封裝： 20-TSSOP
包裝： 帶卷 (TR)
輸入數(shù)目和類型： 1 個單端，單極；1 個單端，雙極；2 個偽差分，單極；2 個偽差分，雙極
AD7707
Rev. B | Page 48 of 52
3 V OPERATION
Table 33 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 are given for all input ranges with a VREF of 1.25 V, HBIAS
= 1.25 V, HICOM = AGND, and AVDD = 3 V. These numbers
are typical and are generated at an analog input voltage of 0 V
for unbuffered mode of operation. Table 34 meanwhile shows
the output rms noise and peak-to-peak resolution for buffered
mode of operation with the same operating conditions as for
Table 33. 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. 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 33 and Table 34 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 33. AIN3, Output RMS Noise/Peak-to-Peak Resolution vs. Gain and Output Update Rate @ +3 V Unbuffered Mode
Filter First
Notch and
Output Data
Rate
3 dB
Frequency
Typical Output RMS Noise in μV (Peak-to-Peak Resolution)
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
12.4 (16)
7.02 (16)
3.87 (16)
2.41 (16)
2.39 (16)
2.3 (15.5)
2.29 (14.5)
2.13 (13.5)
50 Hz
13.1 Hz
30.35 (16)
16.4 (16)
9.4 (16)
5.85 (16)
5.2 (15)
4.5 (14.5)
4.5 (13.5)
5.09 (12)
60 Hz
15.72 Hz
34.55 (16)
19.13 (16)
10.9 (16)
6 (16)
5.8 (15)
5.62 (14)
5.2 (13)
6.14 (12)
250 Hz
65.5 Hz
498 (13)
204 (13)
105 (13)
57.5 (13)
27.5 (13)
17.4 (12.5)
12.7 (12)
11.42 (11)
500 Hz
131 Hz
2266 (10.5)
1151 (10.5)
554 (10.5)
280 (10.5)
136 (10.5)
83 (10)
39 (10)
27.5 (9.5)
Table 34. AIN3, Output RMS Noise/Peak-to-Peak Resolution vs. Gain and Output Update Rate @ +3 V Buffered Mode
Filter First
Notch and
Output Data
Rate
3 dB
Frequency
Typical Output RMS Noise in μV (Peak-to-Peak Resolution)
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
14.84 (16)
8.39 (16)
5.56 (16)
3.45 (16)
3.3 (16)
3.2 (15)
3.2 (14)
3.3 (13)
50 Hz
13.1 Hz
36.1 (16)
18.8 (16)
11.5 (16)
7.5 (15.5)
7.4 (14.5)
7.43 (13.5)
6.8 (12.5)
7 (12)
60 Hz
15.72 Hz
38.8 (16)
21.55 (16)
13.39 (16)
8.5 (15.5)
8.36 (14.5)
8 (13.5)
8.2 (12.5)
7.7 (12)
250 Hz
65.5 Hz
420 (13)
194 (13)
97.6 (13)
54.5 (12.5)
30 (12.5)
22 (12)
18 (11.5)
16.7 (10.5)
500 Hz
131 Hz
2234 (10.5)
1231 (10.5)
534 (10.5)
275 (10.5)
145 (10.5)
71 (10.5)
48 (10)
31 (9.5)
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