参数资料
| 型号： | LTC2262IUJ-12#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/28页 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT 150MSPS 40-QFN |
| 产品培训模块： | LTC2262 - Ultra Low Power High Speed ADCs |
| 标准包装： | 61 |
| 位数： | 12 |
| 采样率（每秒）： | 150M |
| 数据接口： | 并联 |
| 转换器数目： | 1 |
| 功率耗散（最大）： | 146mW |
| 电压电源： | 单电源 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-WFQFN 裸露焊盘 |
| 供应商设备封装： | 40-QFN（6x6） |
| 包装： | 管件 |
| 输入数目和类型： | 1 个差分 |
| 配用： | DC890B-ND - BOARD USB DATA COLLECTION |
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LTC2262-12
19
226212fc
For more information www.linear.com/LTC2262-12
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 exclu-
sive-OR logic operation between the LSB and all other
data output bits. To decode, the reverse operation is ap-
plied—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)
are inverted before the output buffers. The even bits (D0,
D2, D4, D6, D8, D10), 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
thatiscenteredaroundmidscale,thedigitaloutputstoggle
between mostly 1s and mostly 0s. This simultaneous
switching of most of the bits will cause large currents in
the ground plane. By inverting every other bit, the alter-
nate bit polarity mode makes half of the bits transition
high while half of the bits transition low. To first order,
this cancels current flow in the ground plane, reducing
the digital noise.
APPLICATIONS INFORMATION
CLKOUT
OF
D11/D0
D10/D0
D2/D0
D1/D0
D0
226212 F15
OF
D11
D10
D2
D1
D0
RANDOMIZER
ON
D11
FPGA
PC BOARD
D10
D2
D1
D0
226212 F15
D0
D1/D0
D2/D0
D10/D0
D11/D0
OF
CLKOUT
LTC2262-12
Figure 15. Functional Equivalent of Digital Output Randomizer
Figure 16. Unrandomizing a Randomized Digital
Output Signal
相关PDF资料 |
PDF描述 |
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| LTC2264CUJ-12#PBF | IC ADC 12BIT SER/PAR 40M 40-QFN |
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| LTC2281IUP#PBF | IC ADC 10BIT DUAL 64-QFN |
| LTC2282CUP#PBF | IC ADC DUAL 12BIT 105MSPS 64-QFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC2262IUJ-14#PBF | 制造商:Linear Technology 功能描述:ADC Single Pipelined 150Msps 14-bit Parallel/LVDS 40-Pin QFN EP 制造商:Linear Technology 功能描述:IC ADC 14BIT 1.8V 150MSPS 40-QFN |
| LTC2262IUJ-14#TRPBF | 制造商:Linear Technology 功能描述:ADC Single Pipelined 150Msps 14-bit Parallel/LVDS 40-Pin QFN EP T/R 制造商:Linear Technology 功能描述:IC ADC 14BIT 150MSPS 40-QFN |
| LTC2263-12 | 制造商:LINER 制造商全称:Linear Technology 功能描述:12-Bit, 65Msps/40Msps/25Msps Low Power Dual ADCs |
| LTC2263-14 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Quad 14-Bit, 125Msps ADC with Integrated Drivers |
| LTC2263CUJ-12#PBF | 功能描述:IC ADC 12BIT SER/PAR 25M 40-QFN RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1 系列:microPOWER™ 位数:8 采样率（每秒）:1M 数据接口:串行，SPI? 转换器数目:1 功率耗散（最大）:- 电压电源:模拟和数字 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:24-VFQFN 裸露焊盘 供应商设备封装:24-VQFN 裸露焊盘（4x4） 包装:Digi-Reel® 输入数目和类型:8 个单端，单极 产品目录页面:892 (CN2011-ZH PDF) 其它名称:296-25851-6 |
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