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參數(shù)資料
| 型號： | LTC6401IUD-8#PBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 16/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC DRIVER DIFF 16-QFN |
| 標(biāo)準(zhǔn)包裝： | 121 |
| 類型： | ADC 驅(qū)動器 |
| 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 |
LTC6401-8
9
64018f
APPLICATIONS INFORMATION
Circuit Operation
The LTC6401-8 is a low noise and low distortion fully
differential op amp/ADC driver with:
Operation from DC to 2.2GHz –3dB bandwidth
Fixed gain of 2.5V/V (8dB)
Differential input impedance 400Ω
Differential output impedance 25Ω
Differential impedance of output lter 100Ω
The LTC6401-8 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 LTC6401-8 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
LTC6401-8 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 LTC6401-8 is 400Ω.
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 avail-
able. One approach is to use a differential shunt resistor
(Figure 1). Another approach is to employ a wideband
transformer and shunt resistor (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 LTC6401-8 for frequency selec-
tion 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
64018 F01
+OUT
+OUTF
–OUTF
–OUT
+IN
IN+
OUT–
IN–
OUT+
+IN
–IN
200
Ω
57.6
Ω
12.5
Ω
500
Ω
LTC6401-8
200
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
+
–
64018 F02
+OUT
+OUTF
–OUTF
–OUT
+IN
IN+
OUT–
IN–
OUT+
+IN
–IN
MINI CIRCUITS
TCM4-19
–IN
200
Ω
12.5
Ω
500
Ω
LTC6401-8
200
Ω
25
Ω
402
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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| 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 |
| LTC6403-1 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:200MHz, Low Noise, Low Power Fully Differential Input/Output Amplifi er/Driver |
| LTC6403CUD-1#PBF | 功能描述:IC AMP/DRIVER LN LP 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 |
| LTC6403CUD-1#TRPBF | 功能描述:IC AMP/DRIVER LN LP 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 |
| LTC6403CUD-1-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:200MHz, Low Noise, Low Power Fully Differential Input/Output Amplifi er/Driver |
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