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參數(shù)資料
| 型號： | LTC6400IUD-14#PBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 4/16頁 |
| 文件大小： | 0K |
| 描述： | IC ADC DRIVER DIFF 2.4GHZ 16QFN |
| 標準包裝： | 121 |
| 類型： | ADC 驅(qū)動器 |
| 應用： | 數(shù)據(jù)采集 |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-WFQFN 裸露焊盤 |
| 供應商設備封裝： | 16-QFN-EP（3x3） |
| 包裝： | 管件 |
LTC6400-14
12
640014fb
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 202
Ω and RT is
68.5
Ω in order to match to a 50Ω source impedance.
The LTC6400-14 is unconditionally stable under normal
bias conditions. However, the overall differential gain is
affected by both source impedance and load impedance
as shown in Figure 4:
A
V
VR
R
V
OUT
IN
S
L
==
++
1000
200 25
The noise performance of the LTC6400-14 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 voltage gain at the inputs. A trade-off
between gain and noise is obvious when constant noise
gure circle and constant gain circle are plotted within
the same input Smith Chart, based on which users can
choose the optimal source impedance for a given gain
and noise requirement.
Figure 4. Calculate Differential Gain
Output Match and Filter
The LTC6400-14 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 lter outputs at +OUTF/–OUTF have
a –3dB bandwidth of 590MHz. External capacitors can
reduce the low pass lter bandwidth as shown in Figure 5.
A bandpass lter is easily implemented with only a few
componentsasshowninFigure6.Three39pFcapacitorsand
a 16nH inductor create a bandpass lter with 165MHz center
frequency, –3dB frequencies at 138MHz and 200MHz.
Output Common Mode Adjustment
The output common mode voltage is set by the VOCM pin,
which is a high impedance input. The output common mode
voltage is capable of tracking VOCM in a range from 1V to
1.6V. The bandwidth of VOCM control is typically 16MHz,
APPLICATIONS INFORMATION
Figure 3. Input Termination for Single-Ended 50
Ω Input
Impedance
Figure 5. LTC6400-14 Internal Filter Topology Modied for Low
Filter Bandwidth (Three External Capacitors)
640014 F03
+OUT
+OUTF
–OUTF
–OUT
+IN
IN+
OUT–
IN–
OUT+
+IN
–IN
100Ω
RT
68.5Ω
0.1μF
12.5Ω
1000Ω
LTC6400-14
100Ω
RS
50Ω
VIN
1000Ω
12.5Ω
50Ω
2.7pF
13
14
15
16
7
5
6
8
+
–
0.1μF
RT
29Ω
640014 F04
+OUT
+OUTF
–OUTF
–OUT
+IN
IN+
OUT–
IN–
OUT+
+IN
–IN
100Ω
12.5Ω
500Ω
LTC6400-14
100Ω
1/2 RS
VIN
VOUT
500Ω
12.5Ω
50Ω
2.7pF
13
14
15
16
7
5
6
8
+
–
1/2 RL
640014 F05
IN+
OUT–
IN–
OUT+
100Ω
12.5Ω
500Ω
LTC6400-14
100Ω
500Ω
12.5Ω
50Ω
13
14
15
16
7
5
6
8
8.2pF
12pF
FILTERED OUTPUT
(87.5MHz)
+OUT
+OUTF
–OUTF
–OUT
+IN
–IN
2.7pF
Figure 6. LTC6400-14 Internal Filter Topology Modied
for Bandpass Filtering (Three External Capacitors, One
External Inductor)
640014 F06
IN+
OUT–
IN–
OUT+
100Ω
12.5Ω
500Ω
LTC6400-14
LTC2208
100Ω
500Ω
12.5Ω
10Ω
4.99Ω
50Ω
13
14
15
16
7
5
6
8
39pF
16nH
39pF
+OUT
+OUTF
–OUTF
–OUT
+IN
–IN
2.7pF
39pF
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LTC6400IUD-14-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:2.4GHz Low Noise, Low Distortion Differential ADC Driver for 300MHz IF |
| LTC6400IUD-20#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 應用:CATV 安裝類型:表面貼裝 封裝/外殼:20-WQFN 裸露焊盤 供應商設備封裝:20-TQFN-EP（5x5） 包裝:托盤 |
| LTC6400IUD-20#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 應用:CATV 安裝類型:表面貼裝 封裝/外殼:20-WQFN 裸露焊盤 供應商設備封裝:20-TQFN-EP（5x5） 包裝:托盤 |
| LTC6400IUD-20-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:1.8GHz Low Noise, Low Distortion Differential ADC Driver for 300MHz IF |
| LTC6400IUD-20-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:1.8GHz Low Noise, Low Distortion Differential ADC Driver for 300MHz IF |
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