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參數(shù)資料
| 型號： | LTC6421CUDC-20#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 16/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC DRIVER DIFF 20-QFN |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 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： | 20-WFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 20-QFN（3x4） |
| 包裝： | 帶卷 (TR) |
LTC6421-20
9
642120fb
APPLICATIONS INFORMATION
Referring to Figure 3, LTC6421-20 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 202Ω and RT is 66.5Ω
in order to match to a 50Ω source impedance.
The LTC6421-20 is unconditionally stable. However,
the overall differential gain is affected by both source
impedance and load impedance as follows:
A
V =
V
OUT
V
IN
=
2000
R
S + 200
R
L
25 + RL
Figure 3. Input Termination for Single-Ended 50Ω Input Impedance
642120 F03
+IN
IN+
OUT –
IN–
OUT+
–IN
100Ω
RT
66.5Ω
0.1μF
1000Ω
LTC6421-20
100Ω
RS
50Ω
RS//RT
28.7Ω
VIN
1000Ω
+
–
0.1μF
Output Impedance Match
The LTC6421-20 can drive an ADC directly without external
output impedance matching. Alternatively, the differential
output impedance of 25Ω can be matched to a higher
value impedance, e.g. 50Ω, by series resistors or an LC
network.
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
15MHz, which is dominated by a low pass lter connected
to the VOCM pin and is aimed to reduce common mode
noise generation at the outputs. The internal common
mode feedback loop has a – 3dB bandwidth of 300MHz,
allowing fast rejection of any common mode output voltage
disturbance. The VOCM pin should be tied to a DC bias
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參數(shù)描述 |
|---|---|
| LTC6421IUDC-20#PBF | 功能描述:IC ADC DRIVER DIFF 20-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 |
| LTC6421IUDC-20#TR | 制造商:Linear Technology 功能描述:DIFF-AMPLIFIER, 1.3GHZ, 4500V/US, QFN-20, No. of Amplifiers:2, Input Offset Voltage:400V, Bandwidth:1.3GHz, Amplifier Case Style:QFN, No. of Pins:20, Supply Voltage Range:2.85V to 3.5V, Slew Rate:4500V/s, Supply Current:40mA, MSL:-, RoHS Compliant: No |
| LTC6421IUDC-20#TRPBF | 功能描述:IC ADC DRIVER DIFF 20-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 |
| LTC6421IUDC-20-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual Matched 1.3GHz Differential Amplifi ers/ADC Drivers |
| LTC6421IUDC-20-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual Matched 1.3GHz Differential Amplifi ers/ADC Drivers |
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