HSP50016
TM
Data Sheet
September 2000
File Number 3288.7
Digital Down Converter
Features
The Digital Down Converter (DDC) is a single chip
synthesizer, quadrature mixer and lowpass filter. Its input
data is a sampled data stream of up to 16 bits in width and
up to a 75 MSPS data rate. The DDC performs down
conversion, narrowband low pass filtering and decimation to
produce a baseband signal.
• 75 MSPS Input Data Rate
• 16-Bit Data Input; Offset Binary or 2’s Complement
Format
• Spurious Free Dynamic Range Through Modulator
>102dB
• Frequency Selectivity: <0.006Hz
• Identical Lowpass Filters for I and Q
• Passband Ripple: <0.04dB
The internal synthesizer can produce a variety of signal
formats. They are: CW, frequency hopped, linear FM up
chirp, and linear FM down chirp. The complex result of the
modulation process is lowpass filtered and decimated with
identical real filters in the in-phase (I) and quadrature (Q)
processing chains.
• Stopband Attenuation: >104dB
• Filter -3dB to -102dB Shape Factor: <1.5
• Decimation Factors from 32 to 131,072
• IEEE 1149.1 Test Access Port
Lowpass filtering is accomplished via a High Decimation
Filter (HDF) followed by a fixed Finite Impulse Response
(FIR) filter. The combined response of the two stage filter
results in a -3dB to -102dB shape factor of better than 1.5.
The stopband attenuation is greater than 106dB. The
composite passband ripple is less than 0.04dB. The
synthesizer and mixer can be bypassed so that the chip
operates as a single narrow band low pass filter.
• HSP50016-EV Evaluation Board Available
Applications
• Cellular Base Stations
• Smart Antennas
• Channelized Receivers
• Spectrum Analysis
The chip receives forty bit serial commands as a control
input. This interface is compatible with the serial I/O port
available on most microprocessors.
• Related Products: HI5703, HI5746, HI5766 A/Ds
The output data can be configured in fixed point or single
precision floating point. The fixed point formats are 16,
24, 32, or 38-bit, two’s complement, signed magnitude, or
offset binary.
Ordering Information
PART
NUMBER
TEMP.RANGE
PKG.
NO.
o
( C)
PACKAGE
44 Ld PLCC
44 Ld PLCC
HSP50016JC-52
HSP50016JC-75
0 to 70
0 to 70
N44.65
N44.65
The circuit provides an IEEE 1149.1 Test Access Port.
Block Diagram
16
I
HIGH DECIMATION
LOW PASS FIR
DATA
CLK
I
FILTER
FILTER
OUTPUT
Q
Q
HIGH DECIMATION
FILTER
LOW PASS FIR
FILTER
COS
CONTROL
SIN
IQSTRB
COMPLEX
SINUSOID
GENERATOR
CLK
4R
CLK
CLK
R
IQCLK
OR
CLK
2R
TEST ACCESS
PORT
TEST ACCESS
PORT/CTRL
CLK
SER
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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