參數(shù)資料
型號： DC1369A-C
廠商： Linear Technology
文件頁數(shù)： 17/34頁
文件大?。?/td> 0K
描述： BOARD DEMO 80MSPS LTC2259-14
軟件下載： QuikEval II System
設(shè)計(jì)資源： DC1369A Design Files
標(biāo)準(zhǔn)包裝： 1
系列： *
相關(guān)產(chǎn)品： DC890B-ND - BOARD USB DATA COLLECTION
LTC2261-14
LTC2260-14/LTC2259-14
24
226114fc
For more information www.linear.com/LTC2261-14
Digital Output Randomizer
Interference from the A/D digital outputs is sometimes
unavoidable.Digitalinterferencemaybefromcapacitiveor
inductive coupling or coupling through the ground plane.
Even a tiny coupling factor can cause unwanted tones
in the ADC output spectrum. By randomizing the digital
output before it is transmitted off chip, these unwanted
tones can be randomized which reduces the unwanted
tone amplitude.
The digital output is randomized by applying an exclusive-
OR logic operation between the LSB and all other data
outputbits.Todecode,thereverseoperationisapplied—an
exclusive-OR operation is applied between the LSB and
all other bits. The LSB, OF and CLKOUT outputs are not
affected. The output randomizer is enabled by serially
programming mode control register A4.
Alternate Bit Polarity
Another feature that reduces digital feedback on the circuit
board is the alternate bit polarity mode. When this mode
is enabled, all of the odd bits (D1, D3, D5, D7, D9, D11,
D13) are inverted before the output buffers. The even bits
(D0, D2, D4, D6, D8, D10, D12), OF and CLKOUT are not
affected. This can reduce digital currents in the circuit
board ground plane and reduce digital noise, particularly
for very small analog input signals.
When there is a very small signal at the input of the A/D
thatiscenteredaroundmid-scale,thedigitaloutputstoggle
between mostly 1s and mostly 0s. This simultaneous
switchingofmostofthebitswillcauselargecurrentsinthe
ground plane. By inverting every other bit, the alternate bit
polarity mode makes half of the bits transition high while
half of the bits transition low. To first order, this cancels
currentflowinthegroundplane,reducingthedigitalnoise.
applicaTions inForMaTion
CLKOUT
OF
D13/D0
D12/D0
D2/D0
D1/D0
D0
116114 F15
OF
D13
D12
D2
D1
D0
RANDOMIZER
ON
D13
FPGA
PC BOARD
D12
D2
D1
D0
116114 F16
D0
D1/D0
D2/D0
D12/D0
D13/D0
OF
CLKOUT
LTC2261-14
Figure 15. Functional Equivalent of Digital Output Randomizer
Figure 16. Unrandomizing a Randomized Digital
Output Signal
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DC1369A-D 制造商:Linear Technology 功能描述:14BIT ADC Eval Brd, Rq. DC1371 & DC1075 制造商:Linear Technology 功能描述:14BIT ADC Eval Brd, Rq. DC1371 & DC1075; Silicon Manufacturer:Linear Technology; Silicon Core Number:LTC2258-14; Kit Application Type:Data Converter; Application Sub Type:ADC; Kit Contents:Board, Guide
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DC1369A-F 制造商:Linear Technology 功能描述:14BIT ADC Eval Brd, Rq. DC1371 & DC1075 制造商:Linear Technology 功能描述:14BIT ADC Eval Brd, Rq. DC1371 & DC1075; Silicon Manufacturer:Linear Technology; Silicon Core Number:LTC2256-14; Kit Application Type:Data Converter; Application Sub Type:ADC; Kit Contents:Board, Guide
DC1369A-G 功能描述:BOARD DEMO 125MSPS LTC2261-12 RoHS:是 類別:未定義的類別 >> 其它 系列:* 標(biāo)準(zhǔn)包裝:1 系列:* 其它名稱:MS305720A
DC1369A-H 功能描述:BOARD DEMO 105MSPS LTC2260-12 RoHS:是 類別:未定義的類別 >> 其它 系列:* 標(biāo)準(zhǔn)包裝:1 系列:* 其它名稱:MS305720A
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