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ADS58C48IPFPR bảng dữ liệu(PDF) 55 Page - Texas Instruments

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tên linh kiện ADS58C48IPFPR
Giải thích chi tiết về linh kiện  Quad Channel IF Receiver with SNRBoost 3G
PDF  70 Pages
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nhà sản xuất  TI [Texas Instruments]
Trang chủ  http://www.ti.com
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ADS58C48IPFPR bảng dữ liệu(HTML) 55 Page - Texas Instruments

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ADS58C48
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SLAS689 – MAY 2010
GAIN FOR SFDR/SNR TRADE-OFF
ADS58C48 includes gain settings that can be used to get improved SFDR performance. The gain is
programmable from 0 dB to 6 dB (in 0.5 dB steps) using the <GAIN> register bits. For each gain setting, the
analog input full-scale range scales proportionally, as shown in Table 11.
The SFDR improvement is achieved at the expense of SNR; for each gain setting, the SNR degrades about 0.5
-1dB. The SNR degradation is less at high input frequencies. As a result, the fine gain is very useful at high input
frequencies as the SFDR improvement is significant with marginal degradation in SNR. So, the fine gain can be
used to trade-off between SFDR and SNR.
After a reset, the gain function is disabled. To use fine gain:
•
First, program the bits <DIGITAL MODE 1> and <DIGITAL MODE 2> as per the table above to enable the
gain function.
•
This enables gain and puts device in 0 dB gain mode.
•
For other gain settings, program the <GAIN> register bits.
Table 11. Full-Scale Range Across Gains
FULL-SCALE,
GAIN, dB
TYPE
VPP
0
Default after reset
2
1
1.78
2
1.59
3
1.42
Programmable gain
4
1.26
5
1.12
6
1.00
Copyright © 2010, Texas Instruments Incorporated
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