参数资料
| 型号： | LTC6401CUD-14#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 16/16页 |
| 文件大小： | 0K |
| 描述： | IC ADC DRIVER DIFF 16-QFN |
| 标准包装： | 121 |
| 类型： | ADC 驱动器 |
| 应用： | 数据采集 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFQFN 裸露焊盘 |
| 供应商设备封装： | 16-QFN-EP（3x3） |
| 包装： | 管件 |
| 产品目录页面： | 1322 (CN2011-ZH PDF) |
LTC6401-14
9
640114f
APPLICATIONS INFORMATION
Circuit Operation
The LTC6401-14 is a low noise and low distortion fully
differential op amp/ADC driver with:
Operation from DC to 2GHz –3dB bandwidth
Fixed gain of 5V/V (14dB)
Differential input impedance 200Ω
Differential output impedance 25Ω
Differential impedance of output lter 100Ω
The LTC6401-14 is composed of a fully differential amplier
with on chip feedback and output common mode voltage
control circuitry. Differential gain and input impedance
are set by 200Ω/500Ω resistors in the feedback network.
Small output resistors of 12.5Ω improve the circuit stability
over various load conditions. They also provide a possible
external ltering option, which is often desirable when the
load is an ADC.
Filter resistors of 50Ω are available for additional ltering.
Lowpass/bandpass lters are easily implemented with just
a couple of external components. Moreover, they offer
single-ended 50Ω matching in wideband applications and
no external resistor is needed.
The LTC6401-14 is very exible in terms of I/O coupling.
It can be AC- or DC-coupled at the inputs, the outputs or
both. Due to the internal connection between input and
output, users are advised to keep input common mode
voltage between 1V and 1.6V for proper operation. If the
inputs are AC-coupled, the input common mode voltage
is automatically biased approximately 250mV above VOCM
and thus no external circuitry is needed for bias. The
LTC6401-14 provides an output common mode voltage
set by VOCM, which allows driving ADC directly without
external components such as transformer or AC coupling
capacitors. The input signal can be either single-ended
or differential with only minor difference in distortion
performance.
Input Impedance and Matching
The differential input impedance of the LTC6401-14 is
200Ω. Usually the differential inputs need to be terminated
to a lower value impedance, e.g. 50Ω, in order to provide
an impedance match for the source. Several choices are
available. One approach is to use a differential shunt resis-
tor (Figure 1). Another approach is to employ a wideband
transformer (Figure 2). Both methods provide a wideband
match. The termination resistor or the transformer must
be placed close to the input pins in order to minimize
the reection due to input mismatch. Alternatively, one
could apply a narrowband impedance match at the inputs
of the LTC6401-14 for frequency selection and/or noise
reduction.
Figure 1. Input Termination for Differential 50Ω Input Impedance
Using Shunt Resistor
Figure 2. Input Termination for Differential 50Ω Input Impedance
Using a Balun
640114 F01
+OUT
+OUTF
–OUTF
–OUT
+IN
IN+
OUT–
IN–
OUT+
+IN
–IN
100
Ω
66.5
Ω
12.5
Ω
500
Ω
LTC6401-14
100
Ω
25
Ω
25
Ω
VIN
500
Ω
12.5
Ω
50
Ω
50
Ω
2.7pF
13
14
15
16
7
5
6
8
+
–
640114 F02
+OUT
+OUTF
–OUTF
–OUT
+IN
IN+
OUT–
IN–
OUT+
+IN
–IN
MINI CIRCUITS
TCM4-19
–IN
100
Ω
12.5
Ω
500
Ω
LTC6401-14
100
Ω
25
Ω
25
Ω
VIN
500
Ω
12.5
Ω
50
Ω
50
Ω
2.7pF
13
14
15
16
7
5
6
8
+
–
1:4
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC6401CUD-14-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:2GHz Low Noise, Low Distortion Differential ADC Driver for DC-140MHz |
| LTC6401CUD-20#PBF | 功能描述:IC ADC DRIVER DIFF 16-QFN RoHS:是 类别:集成电路 (IC) >> 线性 - 放大器 - 专用 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:60 系列:- 类型:可变增益放大器 应用:CATV 安装类型:表面贴装 封装/外壳:20-WQFN 裸露焊盘 供应商设备封装:20-TQFN-EP（5x5） 包装:托盘 |
| LTC6401CUD-20#TRPBF | 功能描述:IC ADC DRIVER DIFF 16-QFN RoHS:是 类别:集成电路 (IC) >> 线性 - 放大器 - 专用 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:60 系列:- 类型:可变增益放大器 应用:CATV 安装类型:表面贴装 封装/外壳:20-WQFN 裸露焊盘 供应商设备封装:20-TQFN-EP（5x5） 包装:托盘 |
| LTC6401CUD-20PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.3GHz Low Noise, Low Distortion Differential ADC Driver for 140MHz IF |
| LTC6401CUD-20TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.3GHz Low Noise, Low Distortion Differential ADC Driver for 140MHz IF |
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