參數(shù)資料
型號: AD7707BRUZ
廠商: Analog Devices Inc
文件頁數(shù): 9/52頁
文件大?。?/td> 0K
描述: IC ADC 16BIT 3CH 20-TSSOP
標準包裝: 75
位數(shù): 16
采樣率(每秒): 500
數(shù)據(jù)接口: DSP,MICROWIRE?,QSPI?,串行,SPI?
轉換器數(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)
供應商設備封裝: 20-TSSOP
包裝: 管件
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 17 of 52
OUTPUT NOISE FOR HIGH LEVEL INPUT CHANNEL
AIN3 (3 V OPERATION)
Table 13 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, VBIAS = 1.225 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. The ±5 V, 0 V to 5 V, and 0 V to 10 V operating
ranges are only achievable in unbuffered 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 are 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, quantiza-
tion 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 13
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 13. Output RMS Noise/Peak-to-Peak Resolution vs. Gain and Output Update Rate @ +3 V AIN3 Unbuffered Mode Only
Filter First Notch
and Output
Data Rate
3 dB
Frequency
0 V to 10 V Range
±5 V Range
0 to 5 V Range
RMS Noise
P-P (Bits)
RMS Noise
P-P (Bits)
RMS Noise
P-P (Bits)
(μV)
Resolution
(μV)
Resolution
(μV)
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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