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ADS5281IPFPRG4 датащи(PDF) 21 Page - Texas Instruments

номер детали ADS5281IPFPRG4
подробное описание детали  12-Bit Octal-Channel ADC Family Up to 65MSPS
PDF  44 Pages
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ADS5281IPFPRG4 датащи(HTML) 21 Page - Texas Instruments

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PROGRAMMABLE GAIN
ADS5281
ADS5282
SBAS397H – DECEMBER 2006 – REVISED MARCH 2008
ADDRESS
IN HEX
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
NAME
X
X
X
X
GAIN_CH1<3:0>
X
X
X
X
GAIN_CH2<3:0>
2A
X
X
X
X
GAIN_CH3<3:0>
X
X
X
X
GAIN_CH4<3:0>
X
X
X
X
GAIN_CH5<3:0>
X
X
X
X
GAIN_CH6<3:0>
2B
X
X
X
X
GAIN_CH7<3:0>
X
X
X
X
GAIN_CH8<3:0>
In applications where the full-scale swing of the analog input signal is much less than the 2VPP range supported
by the ADS528x, a programmable gain can be set to achieve the full-scale output code even with a lower analog
input swing. The programmable gain not only fills the output code range of the ADC, but also enhances the SNR
of the device by utilizing quantization information from some extra internal bits. The programmable gain for each
channel can be individually set using a set of four bits, indicated as GAIN_CHN<3:0> for Channel N. The gain
setting is coded in binary from 0dB to 12dB, as shown in Table 6.
Table 6. Gain Setting for Channel 1
GAIN_CH1<3>
GAIN_CH1<2>
GAIN_CH1<1>
GAIN_CH1<0>
CHANNEL 1 GAIN SETTING
0
0
0
0
0dB
0
0
0
1
1dB
0
0
1
0
2dB
0
0
1
1
3dB
0
1
0
0
4dB
0
1
0
1
5dB
0
1
1
0
6dB
0
1
1
1
7dB
1
0
0
0
8dB
1
0
0
1
9dB
1
0
1
0
10dB
1
0
1
1
11dB
1
1
0
0
12dB
1
1
0
1
Do not use
1
1
1
0
Do not use
1
1
1
1
Do not use
Copyright © 2006–2008, Texas Instruments Incorporated
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Product Folder Link(s): ADS5281 ADS5282



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