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參數(shù)資料
| 型號(hào)： | LT5512 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 1kHz-3GHz High Signal Level Down-Converting Mixer |
| 中文描述： | 1kHz時(shí)，3GHz的高信號(hào)電平下變頻混頻器 |
| 文件頁(yè)數(shù)： | 9/12頁(yè) |
| 文件大?。?/td> | 267K |
| 代理商： | LT5512 |
LT5512
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5512f
APPLICATIOU
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It is also possible to eliminate the RF balun and drive the
RF inputs differentially. In this case, inductors from Pins
2 and 3 to ground would be required to bias the input
stage. The value of the inductors should be high enough to
avoid reducing the input impedance at the frequency of
interest.
LO Input Port
The LO buffer amplifier consists of high-speed limiting
differential amplifiers, designed to drive the mixer quad for
high linearity. The LO
+
and LO
–
pins are designed for
differential or single-ended drive. An external balun is
optional. Both LO pins are internally biased to 2V
DC
.
The LO input has been designed for simple impedance
matching for frequencies up to 3GHz. A simplified sche-
matic is shown in Figure 6 with the associated external
impedance matching. The matching technique is similar
to that described earlier for the RF port, except the match
is not nearly as critical. Table 2 lists the differential input
impedance and differential reflection coefficient between
the LO
+
and LO
–
pins (Pin 15 to Pin 14). As shown, the real
part of the series impedance is close to 100
. Series
inductors (L3, L4) are used to tune out the capacitive
portion of the differential impedance.
Figure 6. LO Input with External Matching Elements
Table 2. LO Input Differential Impedance
Frequency
Differential Input
(MHz)
750
1000
1250
1500
1750
2000
2250
2500
2750
Differential S11
Mag
0.766
0.760
0.752
0.743
0.733
0.722
0.709
0.695
0.68
Impedance
263 – j172
213 – j178
175 – j173
146 – j164
125 – j153
108 – j142
95 – j131
86 – j122
78 – j113
Angle
–10.2
–13.4
–16.6
–19.8
–22.8
–25.8
–28.9
–31.8
–34.6
Single-ended LO drive can be used if a differential LO
source is not available, or the added expense of a LO balun
is undesirable. In this case, one LO input is AC-coupled to
ground through a 100pf DC blocking capacitor as shown
in Figure 7. The other input is matched to 50
using a
series inductor and a second DC blocking capacitor. The
LT5512 is characterized and production tested with single-
ended LO drive.
5512 F06
V
CC
T3
1:2
LDB211G9010C-001
LO
IN
50
15
14
L3
L4
C11
2V
LO
+
LO
–
1
2
3
4
5
LT5512
2
3
1/2 X
EXT
1/2 X
EXT
1/2 X
INT
1/2 X
INT
j11.4
j11.4
C4
RS
100
RL
20.6
5512 F05
LT5512
Figure 5. 1.9GHz RF Input Matching
Figure 7. Single-Ended LO Input Matching
5512 F07
V
CC
LO
IN
50
15
14
L3
C6
100pF
C7
100pF
2V
LO
+
LO
–
LT5512
The differential port impedance listed in Table 2 can be
used to compute the value of the series matching inductor,
L3. Alternatively, Figure 8 shows measured LO input
return loss for various values of L3.
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| LT5512EUF | 功能描述:IC MIXER DWNCONV HI SIGN 16-QFN RoHS:否 類別:RF/IF 和 RFID >> RF 混頻器 系列:LT5512 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 封裝/外殼:12-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:12-QFN-EP（3x3） |
| LT5512EUF#PBF | 功能描述:IC MIXER DWNCONV HI SIGN 16-QFN RoHS:是 類別:RF/IF 和 RFID >> RF 混頻器 系列:LT5512 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 封裝/外殼:12-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:12-QFN-EP（3x3） |
| LT5512EUF#TR | 功能描述:IC MIXER DOWN-CONV BRDBND 16-QFN RoHS:否 類別:RF/IF 和 RFID >> RF 混頻器 系列:LT5512 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 封裝/外殼:12-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:12-QFN-EP（3x3） |
| LT5512EUF#TRPBF | 功能描述:IC MIXER DWNCONV HI SIGN 16-QFN RoHS:是 類別:RF/IF 和 RFID >> RF 混頻器 系列:LT5512 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 封裝/外殼:12-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:12-QFN-EP（3x3） |
| LT5512EUFPBF | 制造商:Linear Technology 功能描述:Downconverter Mixer,LT5512 3GHz QFN |
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