HSP50215 Datasheet, PDF (1/21 Pages) Intersil Corporation – Digital UpConverter

Data Sheet
HSP50215
January 1999 File Number 4346.4
Digital UpConverter
The HSP50215 Digital UpConverter (DUC) is a QASK/FM
modulator/FDM upconverter designed for high dynamic range
applications such as cellular basestations. The DUC combines
shaping and interpolation filters, a complex modulator, and
Timing and Carrier NCO’s into a single package. Each DUC
can create a single FDM channel. Multiple DUC’s can be
cascaded digitally for multi-channel applications.
The HSP50215 supports both vector and FM modulation. In
vector modulation mode, the DUC accepts 16-bit I and Q
samples to generate virtually any quadrature AM or PM
modulation format. The DUC also has two FM modulation
modes. In the FM with pulse shaping mode, the 16-bit
frequency samples are pulse shaped/bandlimited prior to FM
modulation. No bandlimiting filter follows the FM modulator.
This FM mode is useful for GMSK type modulation formats. In
the FM with bandlimiting filter mode, the 16-bit frequency
samples directly drive the FM modulator. The FM modulator
output is filtered to limit the spectral occupancy. This FM mode
is useful for analog FM or FSK modulation formats.
The DUC includes an NCO driven interpolation filter, which
allows the input and output sample rate to have a non-
integer or variable relationship. This re-sampling feature
simplifies cascading modulators with sample rates that do
not have harmonic or integer frequency relationships.
The DUC offers digital output spectral purity that exceeds
85dB at the maximum output sample rate of 52 MSPS, for
input sample rates as high as 300 KSPS.
A 16-bit microprocessor compatible interface is used to load
configuration and baseband data. A programmable FIFO depth
interrupt simplifies the interface to the I and Q input FIFOs.
Block Diagram
CAS(15:0)
CASZ
IIN(15:0) †
QIN(15:0) †
IFIFO
QFIFO
Features
• Output Sample Rates Up to 52 MSPS (48 MSPS
Industrial); Input Data Rates Up to 3.25 MSPS
• I/Q Vector, FM, and Shaped FM Modulation Formats
• 32-Bit Programmable Carrier NCO; 30-Bit Programmable
Symbol Timing NCO
• Programmable I and Q, 256 Tap, Shaping FIR Filters with
Interpolation by 4, 8 or 16
• Interpolation Filter Up Samples Shaping Filter Output to
Output Sample Rate Under NCO Control
• Processing Capable of >90dB SFDR
• Cascade Input for Multiple Channel Transmissions
• 16-Bit µProcessor Interface for Configuration and User
Data Input
Applications
• Single or Multiple Channel Digital Software Radio
Transmitters (Wide-Band or Narrow-Band)
• Base Station Transceivers
• Operates with HSP50214 in Software Radio Solutions
• Compatible with the HI5741 D/A Converter
• HSP50215EVAL Evaluation Board Available
Ordering Information
PART
NUMBER
HSP50215VC
HSP50215VI
TEMP
RANGE (^oC)
PACKAGE
PKG. NO
0 to 70 100 Ld MQFP Q100 .14x20
-40 to 85 s100 Ld MQFP Q100 .14x20
† = µP CONTROL SIGNALS
GAIN
CTRL
+
+
OUT(15:0)
REFCLK
SYNCIN
RST
WR
RD
CE
C(15:0)
A(9:0)
MUX
FM
MOD
CONTROL
QIN(15:0) †
IIN(15:0) †
CF(31:0) †
SF(29:0) †
I FM
Q FM
NCO
NCO
CF(31:0) †
OE
OFM
SYNCOUT
FIFORDY
SAMPCLK
3-422
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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