参数资料
型号: LTC2261IUJ-12#TRPBF
厂商: Linear Technology
文件页数: 10/34页
文件大小: 0K
描述: IC ADC 12BIT 125MSPS 40-QFN
产品培训模块: LTC2262 - Ultra Low Power High Speed ADCs
标准包装: 2,000
位数: 12
采样率(每秒): 125M
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: 带卷 (TR)
输入数目和类型: 1 个差分
配用: DC890B-ND - BOARD USB DATA COLLECTION
LTC2261-12
LTC2260-12/LTC2259-12
18
226112fc
For more information www.linear.com/LTC2261-12
CONVERTER OPERATION
TheLTC2261-12/LTC2260-12/LTC2259-12arelowpower
12-bit125Msps/105Msps/80MspsA/Dconvertersthatare
poweredbyasingle1.8Vsupply.Theanaloginputsshould
be driven differentially. The encode input can be driven
differentially or single ended for lower power consump-
tion. The digital outputs can be CMOS, double-data rate
CMOS(tohalvethenumberofoutputlines),ordouble-data
rate LVDS (to reduce digital noise in the system.) Many
additional features can be chosen by programming the
mode control registers through a serial SPI port. See the
Serial Programming Mode section.
ANALOG INPUT
The analog input is a differential CMOS sample-and-hold
circuit (Figure 2). The inputs should be driven differentially
around a common mode voltage set by the VCM output
pin, which is nominally VDD/2. For the 2V input range,
the inputs should swing from VCM – 0.5V to VCM + 0.5V.
Thereshouldbe180°phasedifferencebetweentheinputs.
INPUT DRIVE CIRCUITS
Input Filtering
If possible, there should be an RC lowpass filter right at
the analog inputs. This lowpass filter isolates the drive
circuitry from the A/D sample-and-hold switching, and
alsolimitswidebandnoisefromthedrivecircuitry.Figure 3
shows an example of an input RC filter. The RC component
values should be chosen based on the application’s input
frequency.
Transformer Coupled Circuits
Figure 3 shows the analog input being driven by an RF
transformer with a center-tapped secondary. The center
tap is biased with VCM, setting the A/D input at its optimal
DC level. At higher input frequencies a transmission line
CSAMPLE
3.5pF
RON
25
RON
25
VDD
LTC2261-12
AIN+
226112 F02
CSAMPLE
3.5pF
VDD
AIN–
ENC
ENC+
1.2V
10k
1.2V
10k
CPARASITIC
1.8pF
CPARASITIC
1.8pF
10
25
50
0.1F
AIN+
AIN–
12pF
0.1F
VCM
LTC2261-12
ANALOG
INPUT
0.1F
T1
1:1
T1: MA/COM MABAES0060
RESISTORS, CAPACITORS
ARE 0402 PACKAGE SIZE
226112 F03
Figure 2. Equivalent Input Circuit
Figure 3. Analog Input Circuit Using a Transformer.
Recommended for Input Frequencies from 5MHz to 70MHz
applicaTions inForMaTion
相关PDF资料
PDF描述
LTC2261IUJ-14#TRPBF IC ADC 14BIT 125MSPS 40-QFN
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相关代理商/技术参数
参数描述
LTC2261IUJ-14#PBF 功能描述:IC ADC 14-BIT 125MSPS 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
LTC2261IUJ-14#TRPBF 功能描述:IC ADC 14BIT 125MSPS 40-QFN RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:250 系列:- 位数:12 采样率(每秒):1.8M 数据接口:并联 转换器数目:1 功率耗散(最大):1.82W 电压电源:模拟和数字 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-LQFP 供应商设备封装:48-LQFP(7x7) 包装:管件 输入数目和类型:2 个单端,单极
LTC2261IUJ-14-PBF 制造商:LINER 制造商全称:Linear Technology 功能描述:14-Bit, 125/105/80Msps Ultralow Power 1.8V ADCs
LTC2261IUJ-14-TRPBF 制造商:LINER 制造商全称:Linear Technology 功能描述:14-Bit, 125/105/80Msps Ultralow Power 1.8V ADCs
LTC2261UJ-12 制造商:LINER 制造商全称:Linear Technology 功能描述:12-Bit, 125/105/80Msps Ultralow Power 1.8V ADCs