參數(shù)資料
型號： LTC6401CUD-20PBF
廠商： Linear Technology Corporation
英文描述： 1.3GHz Low Noise, Low Distortion Differential ADC Driver for 140MHz IF
中文描述： 1.3GHz的低噪聲，低失真差分ADC驅(qū)動器為140MHz的中頻
文件頁數(shù)： 11/16頁
文件大小： 232K
代理商： LTC6401CUD-20PBF
LTC6401-20
11
640120f
two outputs have the same gain and thus symmetrical
swing. In general, the single-ended input impedance and
termination resistor R
T
are determined by the combination
of R
S
, R
G
and R
F
. For example, when R
S
is 50
Ω
, it is found
that the single-ended input impedance is 200
Ω
and R
T
is
66.5
Ω
in order to match to a 50
Ω
source impedance.
The LTC6401-20 is unconditionally stable. However, the
overall differential gain is affected by both source imped-
ance and load impedance as shown in Figure 4:
The noise performance of the LTC6401-20 also depends
upon the source impedance and termination. For example,
an input 1:4 balun transformer in Figure 2 improves SNR
by adding 6dB of gain at the inputs. A trade-off between
gain and noise is obvious when constant noise figure
circle and constant gain circle are plotted within the same
A
V
V
R
R
+
R
V
OUT
IN
S
L
L
=
=
+
2000
200 25
Figure 4. Calculate Differential Gain
input Smith Chart, based on which users can choose the
optimal source impedance for a given gain and noise
requirement.
Output Match and Filter
The LTC6401-20 can drive an ADC directly without
external output impedance matching. Alternatively, the
differential output impedance of 25
Ω
can be matched to
higher value impedance, e.g. 50
Ω
, by series resistors or
an LC network.
The internal low pass filter outputs at +OUTF/–OUTF
have a –3dB bandwidth of 590MHz. External capacitor
can reduce the low pass filter bandwidth as shown in
Figure 5. A bandpass filter is easily implemented with
only a few components as shown in Figure 6. Three
39pF capacitors and a 16nH inductor create a bandpass
filter with 165MHz center frequency, –3dB frequencies at
138MHz and 200MHz.
APPLICATIONS INFORMATION
Figure 3. Input Termination for Single-Ended 50
Ω
Input
Impedance
Figure 5. LTC6401-20 Internal Filter Topology Modified for Low
Filter Bandwidth (Three External Capacitors)
640120 F03
IN+
OUT–
IN–
OUT+
100
Ω
R
T
66.5
Ω
0.1
μ
F
0.1
μ
F
12.5
Ω
1000
Ω
LTC6401-20
100
Ω
R
S
50
Ω
R
S
50
Ω
V
IN
1000
Ω
12.5
Ω
50
Ω
50
Ω
13
14
15
16
7
5
6
8
+
0.1
μ
F
R
T
66.5
Ω
+OUT
+OUTF
–OUTF
–OUT
+IN
+IN
–IN
–IN
1.7pF
640120 F04
IN+
OUT–
IN–
OUT+
100
Ω
12.5
Ω
1000
Ω
LTC6401-20
100
Ω
1/2 R
S
1/2 R
S
V
IN
V
OUT
1000
Ω
12.5
Ω
50
Ω
50
Ω
13
14
15
16
7
5
6
8
+
1/2 R
L
1/2 R
L
+OUT
+OUTF
–OUTF
–OUT
+IN
+IN
–IN
–IN
1.7pF
640120 F05
IN+
OUT–
IN–
OUT+
100
Ω
12.5
Ω
1000
Ω
LTC6401-20
100
Ω
1000
Ω
12.5
Ω
50
Ω
50
Ω
13
14
15
16
7
5
6
8
8.2pF
8.2pF
12pF(87.5MHz)
+OUT
+OUTF
–OUTF
–OUT
+IN
+IN
–IN
–IN
1.7pF
Figure 6. LTC6401-20 Application Circuit for Bandpass
Filtering (Three External Capacitors, One External Inductor)
LTC2208
10
Ω
10
Ω
4.99
Ω
4.99
Ω
39pF
16nH
39pF
39pF
640120 F06
IN+
OUT–
IN–
OUT+
100
Ω
12.5
Ω
1000
Ω
LTC6401-20
100
Ω
1000
Ω
12.5
Ω
50
Ω
50
Ω
13
14
15
16
7
5
6
8
+OUT
+OUTF
–OUTF
–OUT
+IN
+IN
–IN
–IN
1.7pF
相關(guān)PDF資料
PDF描述
LTC6401CUD-20TRPBF 1.3GHz Low Noise, Low Distortion Differential ADC Driver for 140MHz IF
LTC6401IUD-20PBF 1.3GHz Low Noise, Low Distortion Differential ADC Driver for 140MHz IF
LTC6401IUD-20TRPBF 1.3GHz Low Noise, Low Distortion Differential ADC Driver for 140MHz IF
LTC6406 1.3GHz Low Noise, Low Distortion Differential ADC Driver for 140MHz IF
LT1846 Current Mode PWM Controller
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC6401CUD-20TRPBF 制造商:LINER 制造商全稱:Linear Technology 功能描述:1.3GHz Low Noise, Low Distortion Differential ADC Driver for 140MHz IF
LTC6401CUD-26#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)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝: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
LTC6401CUD-26#TR 制造商:Linear Technology 功能描述:SP Amp DIFF AMP Single 3.5V 16-Pin QFN EP T/R
LTC6401CUD-26#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)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝: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
LTC6401CUD-26-PBF 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
發(fā)布緊急采購，3分鐘左右您將得到回復。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*