3-422

HSP50215

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.

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

Block Diagram

Ordering Information

PART

NUMBER

TEMP

PACKAGE

PKG. NO

HSP50215VC

0 to 70

100 Ld MQFP

Q100 .14x20

HSP50215VI

-40 to 85

s100 Ld MQFP Q100 .14x20

FM

GAIN

NCO

SAMPCLK

CONTROL

C(15:0)

FIFORDY

MOD

RST

MUX

IFM

Q FM

IFIFO

QFIFO

REFCLK

CTRL

+

CAS(15:0)

OE

OUT(15:0)

µP CONTROL SIGNALS

IIN(15:0)

†

QIN(15:0)

†

CF(31:0)

†

IIN(15:0)

†

QIN(15:0)

†

SF(29:0)

†

CF(31:0)

†

A(9:0)

WR

RD

CE

+

CASZ

OFM

SYNCIN

SYNCOUT

NCO

Data Sheet

January 1999

File Number

4346.4

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

http://www.intersil.com or 407-727-9207