参数资料
| 型号： | LTC6400CUD-26#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 2/16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 |
LTC6400-26
10
640026fa
APPLICATIONS INFORMATION
Circuit Operation
The LTC6400-26 is a low noise and low distortion fully
differential op amp/ADC driver with:
Operation from DC to 1.9GHz –3dB bandwidth
Fixed gain of 20V/V (26dB)
Differential input impedance 50
Ω
Differential output impedance 25
Ω
Differential impedance of output lter 100
Ω
The LTC6400-26 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 25
Ω/500Ω resistors in the feedback network.
Small output resistors of 12.5
Ωimprovethecircuitstability
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 50
Ω are available for additional ltering.
Lowpass/bandpass lters are easily implemented with just
a couple of external components. Moreover, they offer
single-ended 50
Ω matching in wideband applications and
no external resistor is needed.
The LTC6400-26 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 close to VOCM and thus no external
circuitry is needed for bias. The LTC6400-26 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 LTC6400-26 is 50
Ω.
The interface between the input of LTC6400-26 and 50
Ω
source is straightforward. One way is to directly connect
them if the source is differential (Figure 1). Another ap-
proach is to employ a wideband transformer if the source
is single ended (Figure 2). Both methods provide a wide-
band match. 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 LTC6400-26 for
frequency selection and/or noise reduction.
Referring to Figure 3, LTC6400-26 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
matching network while the other input is connected to the
same matching network and a source resistor. Because the
return ratios of the two feedback paths are equal, the two
outputs have the same gain and thus symmetrical swing. In
general, the single-ended input impedance and termination
resistor RT are determined by the combination of RS, RG
and RF. For example, when RS is 50Ω, it is found that the
single-ended input impedance is 75
Ω and RT is 150Ω in
order to match to a 50
Ω source impedance.
Figure 1. Input Termination for Differential 50
Ω Input Impedance
Figure 2. Input Termination for Differential 50
Ω
Input Impedance Using a Balun
640026 F01
+OUT
+OUTF
–OUTF
–OUT
+IN
IN+
OUT–
IN–
OUT+
+IN
–IN
25Ω
12.5Ω
500Ω
LTC6400-26
25Ω
VIN
500Ω
12.5Ω
50Ω
2.7pF
13
14
15
16
7
5
6
8
+
–
640026 F02
+OUT
+OUTF
–OUTF
–OUT
+IN
IN+
OUT–
IN–
OUT+
+IN
–IN
25Ω
12.5Ω
500Ω
LTC6400-26
25Ω
50Ω
VIN
500Ω
12.5Ω
50Ω
2.7pF
13
14
15
16
7
5
6
8
+
–
1:1
MACOM
MABA-007159-000000
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC6400CUD-26-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.9GHz Low Noise, Low Distortion Differential ADC Driver for DC-300MHz |
| LTC6400CUD-8 | 制造商:LINER 制造商全称:Linear Technology 功能描述:2.4GHz Low Noise, Low Distortion Differential ADC |
| LTC6400CUD-8#PBF | 功能描述:IC ADC DRIVER DIFF 2.2GHZ 16QFN 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 |
| LTC6400CUD-8#TR | 制造商:Linear Technology 功能描述:DIFF-AMPLIFIER, 2.2GHZ, QFN-16, No. of Amplifiers:1, Input Offset Voltage:5mV, Gain dB Max:8dB, Bandwidth:2.2GHz, Amplifier Case Style:QFN, No. of Pins:16, Supply Voltage Range:2.85V to 3.5V, Slew Rate:3810V/s, Supply Current:85mA , RoHS Compliant: No |
| LTC6400CUD-8#TRPBF | 功能描述:IC ADC DRIVER DIFF 2.2GHZ 16QFN 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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