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参数资料
| 型号： | LTC6420IUDC-20#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/14页 |
| 文件大小： | 0K |
| 描述： | IC DIFF AMP/ADC DRIVER DL 20QFN |
| 标准包装： | 91 |
| 类型： | ADC 驱动器 |
| 应用： | 数据采集 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-WFQFN 裸露焊盘 |
| 供应商设备封装： | 20-QFN（3x4） |
| 包装： | 管件 |
LTC6420-20
8
642020fb
APPLICATIONS INFORMATION
Figure 1. Input Termination for Differential 50Ω Input Impedance
Using Shunt Resistor
Figure 2. Input Termination for Differential 50Ω Input Impedance
Using a 1:4 Balun
Figure 3. Input Termination for Single-Ended 50Ω Input Impedance
642020 F03
+IN
IN+
OUT –
IN–
OUT +
–IN
100Ω
RT
66.5Ω
0.1μF
1000Ω
1/2 LTC6420-20
100Ω
RS
50Ω
RS//RT
28.7Ω
VIN
1000Ω
+
–
0.1μF
Circuit Operation
Each of the two channels of the LTC6420-20 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 100Ω/1000Ω
resistors in the feedback network. Small output resistors
of 12.5Ω improve the circuit stability over various load
conditions.
The LTC6420-20 is very exible in terms of I/O coupling. It
canbeAC-orDC-coupledattheinputs,theoutputsorboth.If
the inputs are AC-coupled, the input common mode voltage
is automatically biased close to VOCM and thus no external
circuitry is needed for bias. The LTC6420-20 provides an
output common mode voltage set by VOCM, which allows
driving an ADC directly without external components such
as a transformer or AC coupling capacitors. The input signal
can be either single-ended or differential with only minor
differences in distortion performance.
Input Impedance and Matching
The differential input impedance of the LTC6420-20 is
200Ω. If a 200Ω source impedance is unavailable, then
the differential inputs may 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 avail-
able. One approach is to use a differential shunt resistor
(Figure 1). Another approach is to employ a wide band
transformer (Figure 2). Both methods provide a wide
band impedance 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 LTC6420-20 for frequency
selection and/or noise reduction.
Referring to Figure 3, LTC6420-20 can be easily congured
for single-ended input and differential output without a
balun. The signal is fed to one of the inputs through a
640020 F01
+IN
IN +
OUT –
IN –
OUT +
–IN
100Ω
66.5Ω
1000Ω
1/2 LTC6420-20
100Ω
25Ω
VIN
1000Ω
+
–
640020 F02
+IN
IN +
OUT –
IN–
OUT +
–IN
100Ω
1000Ω
1/2 LTC6420-20
100Ω
25Ω
VIN
1000Ω
+
–
1:4
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC6420IUDC-20-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Matched 1.8GHz Differential Amplifi ers/ADC Drivers |
| LTC6421-20 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Matched 1.3GHz Differential Amplifi ers/ADC Drivers |
| LTC6421CUDC-20#PBF | 功能描述:IC ADC DRIVER DIFF 20-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 |
| LTC6421CUDC-20#TR | 制造商:Linear Technology 功能描述:DIFF-AMPLIFIER, 1.3GHZ, 4500V/US, QFN-20, No. of Amplifiers:2, Input Offset Voltage:400V, Bandwidth:1.3GHz, Amplifier Case Style:QFN, No. of Pins:20, Supply Voltage Range:2.85V to 3.5V, Slew Rate:4500V/s, Supply Current:40mA, MSL:-, RoHS Compliant: No |
| LTC6421CUDC-20#TRPBF | 功能描述:IC ADC DRIVER DIFF 20-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 |
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