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HSP50214VI Datasheet

  • HSP50214VI

  • Programmable Downconverter

  • 394.34KB

  • 54頁

  • INTERSIL   INTERSIL

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February 2000
T
UCT
ROD RODUC
P
LETE
TE P
BSO BSTITU
O
SU
14B
IBLE HSP502
S
POS
HSP50214
Programmable Downconverter
OUTPUT FORMATTER
[ /Title
(HSP5
0214)
/Sub-
ject
(Pro-
gram-
mable
Down-
con-
verter)
/Autho
r ()
/Key-
words
(Inter-
sil
Semi-
con-
ductor,
Down-
con-
verter,
Down
Con-
verter,
Pro-
gram-
mable
Down-
con-
verter,
DSP,
AMPS,
TDMA
,
North
Ameri-
can
Features
鈥?Up to 52 MSPS Front-End Processing Rates (CLKIN)
and 35 MSPS Back-End Processing Rates (PROCCLK)
Clocks May Be Asynchronous
鈥?Processing Capable of >100dB SFDR8-
鈥?Up to 255-Tap Programmable FIR
鈥?Overall Decimation Factor Ranging from 4 to 16384
鈥?Output Samples Rates to
鈮?.2
MSP8-S with Output
Bandwidths to
鈮?25kHz
Lowpass
鈥?32-Bit Programmable NCO for Channel Selection and
Carrier Tracking
鈥?Digital Re-Sampling Filter for Symbol Tracking Loops
and Incommensurate Sample-to-Output Clock Ratios
鈥?Digital AGC with Programmable Limits and Sle8- Rate
to Optimize Output Signal Resolution; Fixed or Auto
Gain Adjust
鈥?Serial, Parallel, and FIFO 16-Bit Output Modes
鈥?Cartesian to Polar Converter and Frequency Discrimi-
nator for AFC Loops and Demodulation of AM, FM,
FSK, and DPSK
鈥?Input Level Detector for External I.F. AGC Support
Description
The HSP50214 Programmable Downconverter converts
digitized IF data into 鏗乴tered baseband data which can be
processed by a standard DSP microprocessor. The
Programmable Downconverter (PDC) performs down
conversion, decimation, narrowband low pass 鏗乴tering, gain
scaling, re-sampling, and Cartesian to Polar coordinate
conversion.
The 14-bit sampled IF input is down converted to baseband
by digital mixers and a quadrature NCO, as shown in the
Block Diagram. A decimating (4 to 32) 鏗乫th order Cascaded
Integrator-Comb (CIC) 鏗乴ter can be applied to the data
before it is processed by up to 5 decimate-by-2 halfband 鏗乴-
ters. The halfband 鏗乴ters are followed by a 255-tap program-
mable FIR 鏗乴ter. The output data from the programmable FIR
鏗乴ter is scaled by a digital AGC before being re-sampled in a
polyphase FIR 鏗乴ter. The output section can provide seven
types of data: Cartesian (I, Q), polar (R,
胃),
鏗乴tered frequency
(d胃/dt), timing error (TE), and AGC level in either parallel or
serial format.
Ordering Information
PART
NUMBER
HSP50214VC
HSP50214VI
TEMP.
RANGE (
o
C)
0 to 70
-40 to 85
PACKAGE
120 Ld MQFP
120 Ld MQFP
PKG. NO.
Q120.28x28
Q120.28x28
Applications
鈥?Single Channel Digital Software Radio Receivers
鈥?Base Station Rx鈥檚: AMPS, NA TDMA, GSM, and CDMA
鈥?Compatible with HSP50210 Digital Costas Loop for
PSK Reception
鈥?Evaluation Platform Available
Block Diagram
MICROPROCESSOR
READ/WRITE
C(7:0)
LEVEL DETECT
HALFBAND
FILTERS
5
TH
ORDER
CIC
FILTER
5
TH
ORDER
CIC
FILTER
CARRIER
NCO
RE-SAMPLING
NCO
DISCRIMINATOR
FREQ
255-TAP
FIR FILTER
I SYMBOL
POLYPHASE
FIR AND
HALFBAND
FILTERS
POLYPHASE
FIR AND
HALFBAND
FILTERS
SEROUTA
CARTESIAN
TO
POLAR
COORDINATE
CONVERTER
Q SYMBOL
MAG.
SEROUTB
AOUT(15:0)
BOUT(15:0)
CONTROL
AGC LOOP FILTER
AGC
IN(13:0)
GAIN
ADJ
(2:0)
COF
SOF
CLKIN
PROCCLK
REFCLK
INPUT
SECTION
HALFBAND
FILTERS
255-TAP
FIR FILTER
PHASE
鈭?/div>
TIMING ERROR
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
|
Copyright
漏
Intersil Corporation 2000
File Number
4266.3
1

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