參數(shù)資料
型號(hào)： LT5503
廠(chǎng)商： Linear Technology Corporation
英文描述： 1.2GHz to 2.7GHz Direct IQ Modulator and Mixer
中文描述： 1.2GHz至2.7GHz的直接IQ調(diào)制器和調(diào)音臺(tái)
文件頁(yè)數(shù)： 14/20頁(yè)
文件大?。?/td> 210K
代理商： LT5503
LT5503
14
APPLICATIOU
AC-Coupled Baseband Figure 4 shows the simplified
circuit schematic of a high-pass AC-coupled baseband
interface.
W
U
U
5505 F04
18k
18k
0.8pF
0.8pF
0.8pF
0.8pF
BQ
+
BQ
–
BI
+
BI
–
C
CPL
C
CPL
C
CPL
C
CPL
Q
Q
B
I
I
B
LT5503
Figure 4. AC-Coupled Baseband Interface
With approximately 18k of differential input resistance,
the suggested minimum AC-coupling capacitor can be
determined using the following equation:
C
f
CPL
=
1
18 10
3
(
)
where f
C
is the 3dB cut-off frequency of the baseband input
signal.
A larger capacitor may be used where the settling time of
charging and discharging the AC-coupling capacitor is not
critical.
DC-Coupled Baseband The baseband inputs’ internal bias
voltage can be overdriven with an external bias circuit.
This facilitates direct interfacing to a D/A converter for
faster transient response. In this case, the LT5503’s
baseband inputs are DC biased by the converter. The
optimal V
BIAS
is 1.4V, independent of V
CC
. In general, the
maximum V
BIAS
should be less than V
CC
– 0.4V. The DC
load on each converter output can be approximated using
the following equation where I
INPUT
is the current flowing
into a modulator input:
I
V
V
k
INPUT
BIAS
=
1 4
.
9
Figure 5 shows a simplified circuit schematic for interfac-
ing the LT5503’s baseband inputs to the outputs of a D/A
converter. OIP and OIN are the positive and negative
baseband outputs, respectively, of the converter’s
I-channel. Similarly, OQP and OQN are the positive and
negative baseband outputs, respectively, of the converter’s
Q-channel.
5505 F05
18k
18k
0.8pF
0.8pF
0.8pF
0.8pF
BQ
+
BQ
–
BI
+
BI
–
LT5503
I
INPUT
I
INPUT
I
INPUT
I
INPUT
OIP
OIN
OQP
OQN
D/A
Figure 5. DC-Coupled Baseband Interface
Modulator RF Input (MODRFIN)
The modulator RF input buffer is driven single-ended. An
internal active balun circuit produces balanced signals to
drive the integrated phase shifter. Limiters following the
phase shifter output accommodate a wide range of
MODRFIN power, resulting in minimal degradation of
modulation gain/phase accuracy performance or carrier
feedthrough. This pin is easily matched to a 50
source
with the simple lowpass network shown in Figure 2. This
pin is internally biased, therefore an AC-coupling capaci-
tor is required.
Modulator VGA (Variable Gain Amp)
The VGA has two digital selection lines to provide a
nominal 0dB, 4.5dB, 9dB and 13.5dB attenuation from the
maximum modulator output power setting. The logic table
is shown below:
GC2
Attenuation
Low
0dB
4.5dB
High
9dB
13.5dB
GC1
Low
High
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LT5503_09 制造商:LINER 制造商全稱(chēng):Linear Technology 功能描述:1.2GHz to 2.7GHz Direct IQ Modulator and Mixer
LT5503EFE 功能描述:IC DIRECT IQ MOD/MIXER 20-TSSOP RoHS:否 類(lèi)別:RF/IF 和 RFID >> RF 調(diào)制器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:調(diào)制器 LO 頻率:700MHz ~ 2.3GHz RF 頻率:700MHz ~ 2.3GHz P1dB:1dBm 底噪:-148dBm/Hz 輸出功率:-1dBm 電流 - 電源:46mA 電源電壓:2.7 V ~ 3.6 V 測(cè)試頻率:1.75GHz 封裝/外殼:28-WFQFN 裸露焊盤(pán) 包裝:帶卷 (TR)
LT5503EFE#PBF 功能描述:IC DIRECT IQ MOD/MIXER 20-TSSOP RoHS:是 類(lèi)別:RF/IF 和 RFID >> RF 調(diào)制器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:調(diào)制器 LO 頻率:700MHz ~ 2.3GHz RF 頻率:700MHz ~ 2.3GHz P1dB:1dBm 底噪:-148dBm/Hz 輸出功率:-1dBm 電流 - 電源:46mA 電源電壓:2.7 V ~ 3.6 V 測(cè)試頻率:1.75GHz 封裝/外殼:28-WFQFN 裸露焊盤(pán) 包裝:帶卷 (TR)
LT5503EFE#TR 功能描述:IC DIRECT IQ MOD/MIXER 20-TSSOP RoHS:否 類(lèi)別:RF/IF 和 RFID >> RF 調(diào)制器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:調(diào)制器 LO 頻率:700MHz ~ 2.3GHz RF 頻率:700MHz ~ 2.3GHz P1dB:1dBm 底噪:-148dBm/Hz 輸出功率:-1dBm 電流 - 電源:46mA 電源電壓:2.7 V ~ 3.6 V 測(cè)試頻率:1.75GHz 封裝/外殼:28-WFQFN 裸露焊盤(pán) 包裝:帶卷 (TR)
LT5503EFE#TRPBF 功能描述:IC DIRECT IQ MOD/MIXER 20-TSSOP RoHS:是 類(lèi)別:RF/IF 和 RFID >> RF 調(diào)制器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:調(diào)制器 LO 頻率:700MHz ~ 2.3GHz RF 頻率:700MHz ~ 2.3GHz P1dB:1dBm 底噪:-148dBm/Hz 輸出功率:-1dBm 電流 - 電源:46mA 電源電壓:2.7 V ~ 3.6 V 測(cè)試頻率:1.75GHz 封裝/外殼:28-WFQFN 裸露焊盤(pán) 包裝:帶卷 (TR)
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