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參數(shù)資料
| 型號(hào)： | LT5521EUF |
| 廠商： | Linear Integrated Systems |
| 英文描述： | Very High Linearity Active Mixer |
| 中文描述： | 很高的線(xiàn)性度有源混頻器 |
| 文件頁(yè)數(shù)： | 11/16頁(yè) |
| 文件大?。?/td> | 283K |
| 代理商： | LT5521EUF |
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11
LT5521
5521f
APPLICATIU
W
U
U
on the IF input frequency and the LO frequency. Smaller
C13 values have reduced impact on the LO output sup-
pression; larger values will degrade the conversion gain.
A single-ended 50
source can also be matched to the
differential signal inputs of the LT5521 without an input
transformer. Figure 5 shows an example topology for a
discrete balun, and Table 4 lists component values for
several frequencies. The discrete input match is intrinsi-
cally narrowband. LO suppression to the output is de-
graded and noise figure degrades by 4dB for input
frequencies greater than 200MHz. Noise figure degrada-
tion is worse at lower input frequencies.
Operation at Reduced Supply Voltage
External resistors R1 and R7 (Figure 2) set the current
through the mixer core. For best distortion performance,
these resistors should be chosen to maintain a total of
40mA through the mixer core (20mA per side). At 5V
supply, R1 and R7 should be 110
. Table 5 shows
recommended values for R1 and R7 at various supply
voltages.
Caution: Using values below the recommended
resistance can adversely affect operation or damage the
part.
Table 5. Minimum External Resistor Values vs Supply Voltage
V
CC
(V)
5
4.5
4
3.5
3.3
R1, R7 (
)
110
82.5
54.9
38.3
23.2
Excessive mismatch between the external resistors R1
and R7 will degrade performance, particularly LO sup-
pression. Resistors with 1% mismatch are recommended
for optimum performance.
Figure 2 shows RF chokes in series with R1 and R7. These
inductors are optional. In general, the chokes improve the
conversion gain and noise figure by 2dB at 3.3V (i.e., at the
minimum values of R1 and R7). The DC resistance varia-
tion of the RF chokes must be considered in the 1% source
resistance mismatch suggested for maintaining LO sup-
pression performance.
Figure 6 indicates the typical performance of the LT5521
as the external source resistance (R1, R7) is varied while
keeping the supply current constant. Figure 6 data was
taken without the benefit of input chokes, and shows the
gradual gain degradation for smaller values of the input
resistors R1 and R7. Figure 7 shows the typical behavior
when the supply voltage is fixed and the core current is
varied by adjusting values of the external resistors R1 and
R7. Decreasing the core current decreases the power
consumption and improves noise figure but degrades
distortion performance. Figure8 demonstrates the im-
pact of the RF chokes in series with the source resistance
at 3.3V. There is a 2dB improvement in conversion gain
and noise figure and a corresponding decrease in IIP3.
Figure 5. Alternative Transformerless Input Circuit
Using Low Cost Discrete Components
LT5521
5521 F05
L4
C14
C16
1nF
C13
R1
110
C2
82pF
R7
110
L3
IF
IN
50
2
3
IN
+
IN
–
Figure 4. Low Frequency Signal Input
V
CC
IN
–
IN
+
R1
C2
1nF
1nF
LT5521
3
2
C13
IF
IN
50
5521 F04
R7
T1
2:1
Table 4. Component Values for Discrete Bridge Balun Signal
Input Matching
IF (MHz)
C14, C16 (pF)
220
250
640
L3, L4 (nH)
22
18
4.7
22
18
4.7
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| LT5521EUF#PBF | 功能描述:IC MIXER HI LIN 3.7GHZ 16-QFN RoHS:是 類(lèi)別:RF/IF 和 RFID >> RF 混頻器 系列:LT5521 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:100 系列:- RF 型:W-CDMA 頻率:2.11GHz ~ 2.17GHz 混頻器數(shù)目:1 增益:17dB 噪音數(shù)據(jù):2.2dB 次要屬性:- 電流 - 電源:11.7mA 電源電壓:2.7 V ~ 3.3 V 包裝:托盤(pán) 封裝/外殼:12-VFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:12-QFN-EP（3x3） |
| LT5521EUF#TR | 功能描述:IC MIXER HI LIN 3.7GHZ 16-QFN RoHS:否 類(lèi)別:RF/IF 和 RFID >> RF 混頻器 系列:LT5521 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:100 系列:- RF 型:W-CDMA 頻率:2.11GHz ~ 2.17GHz 混頻器數(shù)目:1 增益:17dB 噪音數(shù)據(jù):2.2dB 次要屬性:- 電流 - 電源:11.7mA 電源電壓:2.7 V ~ 3.3 V 包裝:托盤(pán) 封裝/外殼:12-VFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:12-QFN-EP（3x3） |
| LT5521EUF#TRPBF | 功能描述:IC MIXER HI LIN 3.7GHZ 16-QFN RoHS:是 類(lèi)別:RF/IF 和 RFID >> RF 混頻器 系列:LT5521 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:100 系列:- RF 型:W-CDMA 頻率:2.11GHz ~ 2.17GHz 混頻器數(shù)目:1 增益:17dB 噪音數(shù)據(jù):2.2dB 次要屬性:- 電流 - 電源:11.7mA 電源電壓:2.7 V ~ 3.3 V 包裝:托盤(pán) 封裝/外殼:12-VFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:12-QFN-EP（3x3） |
| LT5521EUFPBF | 制造商:Linear Technology 功能描述:Upconverter Mixer,LT5521 3.7GHz QFN |
| LT5522 | 制造商:LINER 制造商全稱(chēng):Linear Technology 功能描述:800MHz to 2.7GHz High Linearity Direct Conversion Quadrature Demodulator |
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