參數(shù)資料
型號(hào)： LTC2260IUJ-14#TRPBF
廠商： Linear Technology
文件頁(yè)數(shù)： 17/34頁(yè)
文件大?。?/td> 0K
描述： IC ADC 14BIT 105MSPS 40-QFN
產(chǎn)品培訓(xùn)模塊： LTC2262 - Ultra Low Power High Speed ADCs
標(biāo)準(zhǔn)包裝： 2,000
位數(shù)： 14
采樣率（每秒）： 105M
數(shù)據(jù)接口： 并聯(lián)
轉(zhuǎn)換器數(shù)目： 1
功率耗散（最大）： 125mW
電壓電源： 單電源
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 40-WFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 40-QFN（6x6）
包裝： 帶卷 (TR)
輸入數(shù)目和類型： 1 個(gè)差分
配用： 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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參數(shù)描述
LTC2260UJ-12 制造商:LINER 制造商全稱:Linear Technology 功能描述:12-Bit, 125/105/80Msps Ultralow Power 1.8V ADCs
LTC2260UJ-14 制造商:LINER 制造商全稱:Linear Technology 功能描述:14-Bit, 125/105/80Msps Ultralow Power 1.8V ADCs
LTC2261-12 制造商:LINER 制造商全稱:Linear Technology 功能描述:12-Bit, 125/105/80Msps Ultralow Power 1.8V ADCs
LTC2261-14 制造商:LINER 制造商全稱:Linear Technology 功能描述:16-Bit, 65Msps/40Msps/25Msps Low Power Dual ADCs
LTC2261CUJ-12#PBF 功能描述:IC ADC 12-BIT 125MSPS 40-QFN RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 其它有關(guān)文件:TSA1204 View All Specifications 標(biāo)準(zhǔn)包裝:1 系列:- 位數(shù):12 采樣率（每秒）:20M 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:155mW 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:48-TQFP 供應(yīng)商設(shè)備封裝:48-TQFP（7x7） 包裝:Digi-Reel® 輸入數(shù)目和類型:4 個(gè)單端，單極；2 個(gè)差分，單極 產(chǎn)品目錄頁(yè)面:1156 (CN2011-ZH PDF) 其它名稱:497-5435-6
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