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PDF LT5503 Data sheet ( Hoja de datos )
| Número de pieza | LT5503 | |
| Descripción | 1.2GHz to 2.7GHz Direct IQ Modulator and Mixer | |
| Fabricantes | Linear | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LT5503 (archivo pdf) en la parte inferior de esta página. Total 20 Páginas | ||
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FEATURES
■ Single 1.8V to 5.25V Supply
■ Direct IQ Modulator with Integrated 90° Phase
Shifter*
■ Four Step RF Power Control
■ 120MHz Modulation Bandwidth
■ Independent Double-Balanced Mixer
■ Modulation Accuracy Insensitive to Carrier Input
Power
■ Modulator I/Q Inputs Internally Biased
■ Available in 20-Lead FE Package
U
APPLICATIO S
■ IEEE 802.11 DSSS and FHSS
■ High Speed Wireless LAN (WLAN)
■ Wireless Local Loop (WLL)
■ PCS Wireless Data
■ MMDS
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners. *Patent Pending
LT5503
1.2GHz to 2.7GHz Direct
IQ Modulator and Mixer
DESCRIPTIO
The LT®5503 is a front-end transmitter IC designed for low
voltage operation. The IC contains a high frequency quadra-
ture modulator with a variable gain amplifier (VGA) and a
balanced mixer. The modulator includes a precision 90°
phase shifter which allows direct modulation of an RF
signal by the baseband I and Q signals.
In a superheterodyne system, the mixer can be used to
generate the high-frequency RF input for the modulator by
mixing the system’s 1st and 2nd local oscillators.
The LT5503 modulator output P 1dB is –3dBm at 2.5GHz.
The VGA allows output power reduction in three steps up
to 13dB with digital control. The baseband inputs are
internally biased for maximum input voltage swing at low
supply voltage. If needed, they can be driven with external
bias voltages.
TYPICAL APPLICATIO
2.45GHz Transmitter Application, Carrier for Modulator Generated by Upmixer
VCC2
2V
2.45GHz
BPF
VCC1
2V
MIXER
ENABLE
MODULATOR
ENABLE
LO2IN
(750MHz)
VCCLO2 VCCLO1
MIXEN
MODEN
LO2
÷2
÷1
MX– MX+
MODIN VCCRF
BQ+ BQ–
VCCMOD
VCCVGA
0°
90°
MODOUT
VGA
LT5503
GND DMODE LO1
LO1IN (2075MHz)
CONTROL
LOGIC
GC1 GC2
2.45GHz
5503 TA01 MODULATED
BI+ BI–
RFOUT
SSB Output Power vs
I, Q Amplitude
0
5.25 VDC
3 VDC
–5 1.8 VDC
–10
–15
–20
–25
–30
–35
–40
–45
0.01
0.1
1
10
I, Q DIFFERENTIAL INPUT VOLTAGE (VP-P)
5503 G04
5503f
1
1 page  
LT5503
TYPICAL PERFOR A CE CHARACTERISTICS (I/Q Modulator)
VCC1 = 3VDC, 2.4GHz matching, MODEN = high, GC1 = GC2 = low (max gain), TA = 25°C, MODRFIN = 2.45GHz at –16dBm, (I–IB) and
(Q–QB) = 100kHz sine at 1VP-P differential, Q leads I by 90°, unless otherwise noted. (Test circuit shown in Figure 2.)
Modulator Supply Current vs
Supply Voltage
38
36
TA = 85°C
34
32
30 TA = 25°C
28
26
24
22 TA = –40°C
20
1.8
2.5 3.2 3.9 4.6
VCC1 SUPPLY VOLTAGE (V)
5.3
5503 G01
2.45GHz Modulated Output
Power vs Supply Voltage
–2
–3
–4
–5
–6
1.8
PLO1 = –12dBm
PLO2 = –18dBm
BASEBAND = 1VP-P
TA = 25°C
2.4 3.0 3.6 4.2 4.8 5.4
SUPPLY VOLTAGE (V)
5503 TA01b
Modulator Shutdown Current vs
Supply Voltage
100
MODEN = LOW
10
TA = 85°C
1
TA = 25°C
0.1
1.8
TA = –40°C
2.5 3.2 3.9 4.6
VCC1 SUPPLY VOLTAGE (V)
5.3
5503 G02
Baseband Frequency Response
I/Q Amplitude = 1VP-P
0
–5 DESIRED
SIDEBAND
–10
–15
–20
–25
–30
–35
–40
0.1
CARRIER
IMAGE
1
I, Q INPUT FREQUENCY (MHz)
10
5503 G05
Typical SSB Spectrum
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
2449.6 2449.8 2450.0 2450.2 2450.4 2450.6
FREQUENCY (MHz)
5503 G07
MODEN Current vs Enable
Voltage
220
MODEN = VCC1
200
180
TA = 85°C
160
140
TA = 25°C
120
100
TA = –40°C
80
60
40
1.8
2.5 3.2 3.9 4.6
MODEN VOLTAGE (V)
5.3
5503 G03
MODRFIN and MODRFOUT
Return Loss 2.4GHz Matching
0
MODRFOUT
–10
–20
–30
–40
2050
MODRFIN
2250
2450
2650
FREQUENCY (MHz)
2850
5503 G06
5503f
5
5 Page 
BLOCK DIAGRA
LT5503
BQ+ BQ–
21
BI– BI+
20 19
VCCMOD 5
V-I
V-I
VCCRF 6
MODIN 4
RF
BUFFER
90°
0°
VGA
CONTROL
LOCIC
16 VCCVGA
17 MODOUT
18 GC2
3 GC1
MODULATOR BIAS CIRCUITS
13 MODEN
VCCLO1 8
LO1
BUFFER
LO1 7
MIXER BIAS CIRCUITS
LIM ÷2
÷1
12 MIXEN
15 VCCLO2
LIM 14 LO2
21
GND
(BACKSIDE)
10 11
MX+ MX–
9
DMODE
5503 BD
5503f
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LT5503.PDF ] | |
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