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參數(shù)資料
| 型號(hào)： | LTC6421IUDC-20#PBF |
| 廠商： | Linear Technology |
| 文件頁(yè)數(shù)： | 16/16頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC DRIVER DIFF 20-QFN |
| 標(biāo)準(zhǔn)包裝： | 91 |
| 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： | 20-WFQFN 裸露焊盤(pán) |
| 供應(yīng)商設(shè)備封裝： | 20-QFN（3x4） |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁(yè)面： | 1323 (CN2011-ZH PDF) |
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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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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| LTC6430-15 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Linearity Differential RF/IF Amplifier/ADC Driver |
| LTC6430AIUF-15#PBF | 制造商:Linear Technology 功能描述:IC AMPLIFIER DRIVER 24-QFN 制造商:Linear Technology 功能描述:RF AMP 5.2DB 20MHZ-2GHZ 5V 制造商:Linear Technology 功能描述:RF AMP, 5.2DB, 20MHZ-2GHZ, 5V, QFN-24 制造商:Linear Technology 功能描述:RF AMP, 5.2DB, 20MHZ-2GHZ, 5V, QFN-24; Frequency Min:20MHz; Frequency Max:2GHz; Gain:15.2dB; Noise Figure Typ:3dB; RF IC Case Style:QFN; No. of Pins:24; Supply Voltage Min:4.75V; Supply Voltage Max:5.25V; Package / Case:24-QFN ;RoHS Compliant: Yes |
| LTC6430AIUF-15#TRPBF | 制造商:Linear Technology 功能描述:IC AMPLIFIER GAIN BLOCK 24QFN 制造商:Linear Technology 功能描述:RF/IF AMPLIFIER, 15.2DB, 50MHZ-1GHZ, 5.25V, QFN-24; Frequency Min:50MHz; Frequency Max:1GHz; Gain:15.2dB; Noise Figure Typ:3dB; RF IC Case Style:QFN; No. of Pins:24; Supply Voltage Min:4.75V; Supply Voltage Max:5.25V; RF Type:CATV ;RoHS Compliant: Yes |
| LTC6430BIUF-15#PBF | 制造商:Linear Technology 功能描述:IC AMPLIFIER DRIVER 24-QFN 制造商:Linear Technology 功能描述:RF AMP 5.2DB 20MHZ-2GHZ 5V 制造商:Linear Technology 功能描述:RF AMP, 5.2DB, 20MHZ-2GHZ, 5V, QFN-24; Frequency Min:20MHz; Frequency Max:2GHz; Gain:15.2dB; Noise Figure Typ:3dB; RF IC Case Style:QFN; No. of Pins:24; Supply Voltage Min:4.75V; Supply Voltage Max:5.25V; Package / Case:24-QFN ;RoHS Compliant: Yes |
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