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參數(shù)資料
| 型號(hào)： | LTC6401IUD-26#PBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 2/16頁 |
| 文件大小： | 0K |
| 描述： | IC ADC DRIVER DIFF 16-QFN |
| 標(biāo)準(zhǔn)包裝： | 121 |
| 類型： | ADC 驅(qū)動(dòng)器 |
| 應(yīng)用： | 數(shù)據(jù)采集 |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-WFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 16-QFN-EP（3x3） |
| 包裝： | 管件 |
LTC6401-26
10
640126f
APPLICATIONS INFORMATION
Circuit Operation
The LTC6401-26 is a low noise and low distortion fully
differential op amp/ADC driver with:
Operation from DC to 1.6GHz –3dB bandwidth
Fixed gain of 20V/V (26dB)
Differential input impedance 50Ω
Differential output impedance 25Ω
Differential impedance of output lter 100Ω
The LTC6401-26 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 25Ω/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 LTC6401-26 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 LTC6401-26 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 LTC6401-26 is 50Ω.
The interface between the input of LTC6401-26 and 50Ω
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. Alternatively, one could apply a narrowband
impedance match at the inputs of the LTC6401-26 for
frequency selection and/or noise reduction.
Referring to Figure 3, LTC6401-26 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 75Ω and RT is 150Ω in
order to match to a 50Ω source impedance.
Figure 1. Input Termination for Differential 50Ω Input Impedance
Figure 2. Input Termination for Differential 50Ω Input Impedance
Using a Balun
640126 F01
+OUT
+OUTF
–OUTF
–OUT
+IN
IN+
OUT–
IN–
OUT+
+IN
–IN
25
Ω
12.5
Ω
500
Ω
LTC6401-26
25
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
+
–
640126 F02
+OUT
+OUTF
–OUTF
–OUT
+IN
IN+
OUT–
IN–
OUT+
+IN
–IN
25
Ω
12.5
Ω
500
Ω
LTC6401-26
25
Ω
50
Ω
VIN
500
Ω
12.5
Ω
50
Ω
50
Ω
2.7pF
13
14
15
16
7
5
6
8
+
–
1:1
M/A-COM
MABA-007159-000000
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC6401IUD-26-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:1.6GHz Low Noise, Low Distortion Differential ADC Driver for DC-140MHz |
| LTC6401IUD-8#PBF | 功能描述:IC ADC DRIVER DIFF 16-QFN RoHS:是 類別:集成電路 (IC) >> 線性 - 放大器 - 專用 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:60 系列:- 類型:可變增益放大器 應(yīng)用:CATV 安裝類型:表面貼裝 封裝/外殼:20-WQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:20-TQFN-EP（5x5） 包裝:托盤 |
| LTC6401IUD-8#TRPBF | 功能描述:IC ADC DRIVER DIFF 16-QFN RoHS:是 類別:集成電路 (IC) >> 線性 - 放大器 - 專用 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:60 系列:- 類型:可變增益放大器 應(yīng)用:CATV 安裝類型:表面貼裝 封裝/外殼:20-WQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:20-TQFN-EP（5x5） 包裝:托盤 |
| LTC6401IUD-8-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:2.2GHz Low Noise, Low Distortion Differential ADC Driver for DC-140MHz |
| LTC6401IUD-8-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:2.2GHz Low Noise, Low Distortion Differential ADC Driver for DC-140MHz |
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