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LT5506 Datasheet

  • LT5506

  • 40MHz to 500MHz Quadrature Demodulator with VGA

  • 12頁

  • LINER

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LT5506
40MHz to 500MHz
Quadrature Demodulator
with VGA
DESCRIPTIO
The LT
廬
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.
FEATURES
s
s
s
s
s
s
s
s
s
s
s
s
s
s
Wide Range 1.8V to 5.25V Supply
Frequency Range: 40MHz to 500MHz
鈥?dB to 59dB Variable Power Gain
THD < 0.12% (鈥?8dBc)
at 800mV
P-P
Differential Output Level
8.8MHz I/Q Lowpass Output Noise Filters
IF Overload Detector
Baseband I/Q Amplitude Imbalance: 0.2dB
Baseband I/Q Phase Imbalance: 0.6擄
6.8dB Noise Figure at Max Gain
Input IP3 at Low Gain: 鈥?0.5dBm
Low Supply Current: 27mA
Low Delay Shift Over Gain Control Range: 2ps/dB
Outputs Biased Up While in Standby
16-Lead QFN 4mm x 4mm Package with Exposed Pad
APPLICATIO S
s
s
s
IEEE802.11
High Speed Wireless LAN
Wireless Local Loop
TYPICAL APPLICATIO
280MHz
IF INPUT
L1
15nH
C3
10pF
L2
15nH
IF
+
C2
1碌F
C1
1nF
V
CC
1.8V
鈥?0
鈥?5
I
OUT+
I
OUT鈥?/div>
THD (dBc)
IF
鈥?/div>
鈥?0
鈥?5
鈥?0
鈥?5
鈥?0
鈥?0
GAIN CONTROL
2xLO
C4
560MHz
3.3pF
INPUT
V
CTRL
2xLO
L3
39nH
2xLO
鈥?/div>
EN
STBY
GND
+
IF DET
Q
OUT+
梅2
Q
OUT鈥?/div>
LT5506
5506 TA01
C3
1.8pF
C5
3.3pF
ENABLE STANDBY
U
U
U
Total Harmonic Distortion vs
IF Input Level at 1.8V Supply
f
IF, 1
= 280MHz
f
IF, 2
= 280.1MHz
f
2xLO
= 570MHz
800mV
P-P
DIFFERENTIAL OUT
鈥?0
鈥?0
鈥?0
鈥?0
IF INPUT POWER EACH TONE (dBm)
鈥?0
5506 TA01b
5506fa
1

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