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3-193
HSP43216
Halfband Filter
The HSP43216 Halfband Filter addresses a wide variety of
applications by combining f
S
/4 (f
S
= sample frequency)
quadrature up/down convert circuitry with a fixed coefficient
halfband filter processor as shown in the block diagram.
These elements may be configured to operate in one of the
four following modes: decimate by 2 filtering of a real input
signal; interpolate by 2 filtering of a real input signal; f
S
/4
quadrature down conversion of a real input signal followed
by decimate-by-2 filtering to produce a complex analytic
signal; interpolate-by-2 filtering of a complex analytic signal
followed by f
S
/4 quadrature up conversion to produce a real
valued output.
The frequency response of the HSP43216's halfband filter
has a shape factor, (passband+transition band)/passband,
of 1.24:1 with 90dB of stopband attenuation. The passband
has less than 0.0003dB of ripple from 0f
S
to 0.2f
S
with
stopband attenuation of greater than 90dB from 0.3f
S
to
Nyquist. At 0.25f
S
the filter provides 6dB of attenuation.
The HSP43216 processes data streams with word widths up
to 16 bits and data rates up to 52 MSPS. The processing
throughput of the part is easily doubled to rates of up to 104
MSPS by using the part together with an external multiplexer
or demultiplexer. Programmable rounding is provided to
support output precisions from 8 bits to 16 bits.
Features
Sample Rates to 52 MSPS
Architected to Support Sample Rates to 104 MSPS Using
External Multiplexer
Four Modes of Operation:
- Interpolate by 2 Filtering
- Decimate by 2 Filtering
- Quadrature to Real Signal Conversion
- f
S
/4 Quadrature Down Conversion Followed by
Decimate by 2 Filtering
16-Bit Inputs and Outputs
67-Tap Halfband FIR Filter with 20-Bit Coefficients
Two’s Complement or Offset Binary Outputs
Programmable Rounding on Outputs
1.24:1 Filter Shape Factor
>90dB Stopband Attenuation
<0.0003dB Passband Ripple
Saturation Logic on Output
Applications
Digital Down Conversion
D/A and A/D pre/post Filtering
Tuning Bandwidth Expansion for HSP45116 and
HSP45106
Block Diagram
Ordering Information
PART
NUMBER
TEMP.
RANGE (
o
C)
PACKAGE
TYPE
PKG. NO.
HSP43216GC-52
0 to 70
85 Ld CPGA
G85.A
HSP43216JC-52
0 to 70
84 Ld PLCC
N84.1.15
HSP43216VC-52
0 to 70
100 Ld MQFP
Q100.14x20
INPUT DATA
FLOW
CONTROLLER
f
S
/4
QUADRATURE
DOWN
CONVERT
PROCESSOR
67-TAP
HALFBAND
FILTER
PROCESSOR
f
S
/4
QUADRATURE
UP CONVERT
PROCESSOR
OUTPUT DATA
FLOW
CONTROLLER/
FORMATTER
AIN0-15
BIN0-15
AOUT0-15
BOUT0-15
MODE0-1
INT/EXT
RND0-2
SYNC
USB/LSB
FMT
OEA
OEB
CLK
Data Sheet
January 1999
File Number
3365.7
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
http://www.intersil.com or 407-727-9207
|
Copyright
Intersil Corporation 1999