5504 DCR
Direct Conversion Receiver
Advanced Information
April 2000
DESCRIPTION
The 5504 is a low cost, high performance direct
conversion receiver (DCR) specifically designed for
digital wireless applications. The DCR architecture
provides a receiver design with fewer external
components than the conventional dual conversion
approach. The 5504 is designed to operate over an
input frequency range of 950 to 2150 MHz. The
device accepts an input signal in this frequency
range and down converts directly to baseband. The
local oscillator signal is generated by a completely
integrated phase lock loop that is fully
programmable through a standard serial port
interface.
FEATURES
鈥?/div>
Wideband I/Q demodulator
鈥?RF input 950 to 2150 MHz
鈥?External lowpass filter
- Integrated post-filter baseband drivers
鈥?/div>
Integrated VCO and frequency synthesizer
鈥?/div>
AGC Amplifier
APPLICATIONS
鈥?/div>
Digital Satellite
鈥?/div>
VSAT Receivers
BLOCK DIAGRAM
VPA3a
VPA3b
VPA5a
VPA5b
VPD1
VPD2
VPA1
VPA6
VPA4
QO1
TP1
TP2
IO1
Qin
AGC
RFp
RFn
Dclk
Din
XTLP
XTLN
FILN
EON
Charge
Pump
Divide
11-bit
2
16
.............
2
6
Div
32/33
Serial
Port
Xtal
Osc.
C1
Iin
IO2
Power
Splitter
0
90
QO2
R3 R2 R1 R0
VCO1
VCO0
Divide
10-bit
C0
2
5 .............
2
0
Phase
Detect
Modulo
6-bit
VCO
RSHP
RSHN
RSLP
RSLN
Rext
VNS
VNA3b
VNA6a
VNA3a
VNA6b
1
VND1
VNA1
VNA4
VNA5
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