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PDF LT5506 Data sheet ( Hoja de datos )
| Número de pieza | LT5506 | |
| Descripción | 40MHz to 500MHz Quadrature Demodulator | |
| Fabricantes | Linear | |
| Logotipo |  |
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LT5506
FEATURES
s Wide Range 1.8V to 5.25V Supply
s Frequency Range: 40MHz to 500MHz
s –4dB to 59dB Variable Power Gain
s THD < 0.12% (–58dBc)
at 800mVP-P Differential Output Level
s 8.8MHz I/Q Lowpass Output Noise Filters
s IF Overload Detector
s Baseband I/Q Amplitude Imbalance: 0.2dB
s Baseband I/Q Phase Imbalance: 0.6°
s 6.8dB Noise Figure at Max Gain
s Input IP3 at Low Gain: – 0.5dBm
s Low Supply Current: 27mA
s Low Delay Shift Over Gain Control Range: 2ps/dB
s Outputs Biased Up While in Standby
s 16-Lead QFN 4mm x 4mm Package with Exposed Pad
U
APPLICATIO S
s IEEE802.11
s High Speed Wireless LAN
s Wireless Local Loop
40MHz to 500MHz
Quadrature Demodulator
with VGA
DESCRIPTIO
The LT®5506 is a 40MHz to 500MHz monolithic integrated
quadrature demodulator with variable gain amplifier (VGA),
designed for low voltage operation. It supports standards
that use a linear modulation format. The chip consists of
a VGA, quadrature down-converting mixers and lowpass
noise filters. The LO port consists of a divide-by-two stage
and LO buffers. The IC provides all building blocks for IF
down-conversion to I and Q baseband signals with a single
supply voltage of 1.8V to 5.25V. The VGA gain has a linear-
in-dB relationship to the control input voltage. Hard-clip-
ping amplifiers at the mixer outputs reduce the recovery
time from a signal overload condition. The lowpass filters
reduce the out-of-band noise and spurious frequency
components. The cut-off frequency of the noise filters is
approximately 8.8MHz. The external 2xLO frequency is
required to be twice the IF input frequency for the mixers.
The standby mode provides reduced supply current and
fast transient response into the normal operating mode
when the I/Q outputs are AC-coupled to a baseband chip.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
280MHz
IF INPUT
L1
15nH
C3
10pF
L2
15nH
IF+
IF –
C2
1µF
GAIN CONTROL
2xLO
560MHz
INPUT
C4
3.3pF
C5
3.3pF
VCTRL
2xLO+
L3
39nH
2xLO–
EN
÷2
STBY
ENABLE STANDBY
1.8V
C1
1nF
VCC
GND
IOUT+
IOUT–
IF DET
QOUT+
QOUT–
LT5506
5506 TA01
C3
1.8pF
Total Harmonic Distortion vs
IF Input Level at 1.8V Supply
–30
fIF, 1 = 280MHz
fIF, 2 = 280.1MHz
–35 f2xLO = 570MHz
800mVP-P DIFFERENTIAL OUT
–40
–45
–50
–55
–60
–60 –50 –40 –30 –20 –10
IF INPUT POWER EACH TONE (dBm)
5506 TA01b
5506fa
1
1 page  
LT5506
TYPICAL PERFOR A CE CHARACTERISTICS VCC = 3V. f2×LO = 570MHz, P2×LO = –5dBm
(Note 5), fIF = 284MHz, PIF = –30dBm, I and Q outputs 800mVP-P into 4kΩ differential load, TA = 25°C, EN = VCC, STBY = VCC,
unless otherwise noted. (Note 3)
Total Harmonic Distortion
vs IF Input Power at 3V Supply
and 800mVP-P Differential Out
–30
fIF,1 = 280MHz
–35
fIF,2 = 280.1MHz
f2xLO = 570MHz
–40
–45 –40°C
–50
–55
–60
–65
–60
25°C
85°C
–50 –40 –30 –20
IF INPUT POWER EACH TONE (dBm)
5506 G07
Total Harmonic Distortion vs IF
Input Power and Supply Voltage
–30
800mVP-P DIFFERENTIAL OUT
fIF,1 = 280MHz
–35 fIF,2 = 280.1MHz
f2xLO = 570MHz
–40
3V
–45
1.8V
–50
5.25V
–55
Total Harmonic Distortion
vs IF Input Power and IF
Frequency
–30
800mVP-P DIFFERENTIAL OUT
3V SUPPLY
–35
–40
–45
fIF = 280MHz
–50
fIF = 550MHz
–55 fIF = 40MHz
–60
–60
–50 –40 –30 –20
IF INPUT POWER EACH TONE (dBm)
Total Harmonic Distortion 5506 G08
vs IF Input Power at 500mVP-P
Differential Out
–40
fIF,1 = 280MHz
fIF,2 = 280.1MHz
–45 f2xLO = 570MHz
–50
–55
–40°C
–60
–65
25°C
85°C
Total Harmonic Distortion
vs IF Input Power at 1.8V Supply
and 800mVP-P Differential Out
–30
fIF,1 = 280MHz
fIF,2 = 280.1MHz
–35 f2xLO = 570MHz
–40
–45 –40°C
–50
25°C
85°C
–55
–60
–60
–50 –40 –30 –20
IF INPUT POWER EACH TONE (dBm)
LPF Frequency Response
vs Baseband Frequency
and Temperature
5506 G09
0
VCC = 3V
–5
25°C
85°C
–10 –40°C
–15
–20
–60
–60
–50 –40 –30 –20
IF INPUT POWER EACH TONE (dBm)
LPF Frequency Response 5506 G10
vs Baseband Frequency and
Supply Voltage
0
–5
3V
1.8V
5.25V
–10
–15
–70
–45 –40 –35 –30 –25 –20
IF INPUT POWER EACH TONE (dBm)
5506 G11
IF Detector Output Voltage vs
IF Input CW Power at 3V Supply
1.4
fIF = 280MHz
1.2
1.0
0.8 –40°C 85°C
25°C
0.6
–25
0
5 10 15 20
BASEBAND FREQUENCY (MHz)
25
5505 G12
IF Detector Output Voltage vs
IF Input CW Power at 1.8V Supply
1.4
fIF = 280MHz
1.2
1.0
0.8 –40°C 85°C
25°C
0.6
–20 0.4
0.4
–25
0
5 10 15 20
BASEBAND FREQUENCY (MHz)
25
5505 G13
0.2
–40
–30 –20 –10
0
IF INPUT CW POWER (dBm)
10
5506 G14
0.2
–40
–30 –20 –10
0
IF INPUT CW POWER (dBm)
10
5506 G15
5506fa
5
5 Page 
APPLICATIO S I FOR ATIO
LT5506
Figure 7. Component Side Silkscreen of Evaluation Board
Figure 8. Component Side Layout of Evaluation Board
Figure 9. Bottom Side Silkscreen of Evaluation Board
Figure 10. Bottom Side Layout of Evaluation Board
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
5506fa
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LT5506.PDF ] | |
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