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AFE5805 Datasheet(PDF) 32 Page - Texas Instruments

Part # AFE5805
Description  FULLY-INTEGRATED, 8-CHANNEL ANALOG FRONT-END FOR ULTRASOUND 0.85nV/√Hz, 12-Bit, 50MSPS, 122mW/Channel
PDF  53 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

AFE5805 Datasheet(HTML) 32 Page - Texas Instruments

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AFE5805
SBOS421D – MARCH 2008 – REVISED MARCH 2010
www.ti.com
PROGRAMMABLE GAIN
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_CH4<3:0>
X
X
X
X
GAIN_CH3<3:0>
2A
X
X
X
X
GAIN_CH2<3:0>
X
X
X
X
GAIN_CH1<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>
The AFE5805, through its registers, allows for a digital gain to be programmed for each channel. This
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
using 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 15.
Table 15. 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
32
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Copyright © 2008–2010, Texas Instruments Incorporated
Product Folder Link(s): AFE5805



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