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ISL5216KI-1Z Datasheet(PDF) 6 Page - Intersil Corporation

No. de pieza ISL5216KI-1Z
Descripción Electrónicos  Four-Channel Programmable Digital DownConverter
Download  65 Pages
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Fabricante Electrónico  INTERSIL [Intersil Corporation]
Página de inicio  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL5216KI-1Z Datasheet(HTML) 6 Page - Intersil Corporation

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6
July 8, 2005
Functional Description
The ISL5216 is a 4-channel digital receiver integrated circuit
offering exceptional dynamic range and flexibility. Each of
the four channels consists of a front-end NCO, digital mixer,
and CIC-filter block and a back-end FIR, AGC and Cartesian
to polar coordinate-conversion block. The parameters for the
four channels are independently programmable. Four 17-bit
parallel data input busses (A(15:-1), B(15:-1), C(15:-1) and
D(15:-1)) and four pairs of serial data outputs (SDxA, SDxB,
SDxC, and SDxD; x = 1 or 2) are provided. Each input can
be connected to any or all of the internal signal processing
channels, Channels 0, 1, 2 and 3. The output of each
channel can be routed to any of the serial outputs. Outputs
from more than one channel can be multiplexed through a
common output if the channels are synchronized. The four
channels share a common input clock and a common serial
output clock, but the output sample rates can be
synchronous or asynchronous. Bus multiplexers between the
front end and back end sections provide flexible routing
between channels for cascading back-end filters or for
routing one front end to multiple back ends for polyphase
filtering or systolic arrays (to provide wider bandwidth
filtering). A level detector is provided to monitor the signal
level on any of the parallel data input busses, facilitating
microprocessor control of gain blocks prior to an A/D
converter.
Each front end NCO/digital mixer/CIC filter section includes
a quadrature numerically controlled oscillator (NCO), digital
mixer, barrel shifter and a cascaded-integrator-comb filter
(CIC). The NCO has a 32-bit frequency control word for
22.1millihertz tuning resolution at an input sample rate of
95MSPS. The SFDR of the NCO is >115dB. The CIC filter
order is programmable between 1 and 5 and the CIC
decimation factor can be programmed from 4 to 512 for 5th
order, 2048 for 4th order, 32768 for 3rd order, or 65536 for 1st
or 2nd order filters.
Each channel back end section includes an FIR processing
block, an AGC and a cartesian-to-polar coordinate converter.
The FIR processing block is a flexible filter compute engine
that can compute a single FIR or a set of cascaded
decimating, interpolating or resampling filters. A single filter
in a chain can have up to 256 taps and the total number of
taps in a set of filters can be up to 384 provided that the
decimation is sufficient. The ISL5216 calculates two taps per
clock (on each channel) for symmetric filters, generally
making decimation the limiting factor for the number of taps
available. The filter compute engine supports a variety of
filter types including decimation, interpolation and
resampling filters. The coefficients for the programmable
digital filters are 22 bits wide. Coefficients are provided in
ROM for several halfband filter responses and for a
resampler. The AGC section can provide up to 96dB of either
fixed or automatic gain control. For automatic gain control,
two settling modes and two sets of loop gains are provided.
Separate attack and decay slew rates are provided for each
loop gain. Programmable limits allow the user to select a
gain range less than 96dB. The outputs of the cartesian-to-
polar coordinate conversion block, used by the AGC loop,
are also provided as outputs to the user for AM and FM
demodulation.
The ISL5216 supports both fixed and floating point parallel
data input modes. The floating point modes support gain
ranging A/D converters. Gated, interpolated and multiplexed
data input modes are supported. The serial data output word
width for each data type can be programmed to one of ten
output bit widths from 4-bit fixed point through 32-bit IEEE
754 floating point.
The ISL5216 is programmed through a 16-bit
microprocessor interface. The output data can also be read
via the microprocessor interface for all channels that are
synchronized. The ISL5216 is specified to operate to a
maximum clock rate of 95MSPS over the industrial
temperature range (-40oC to 85oC). The I/O power supply
voltage range is 3.3V
± 0.165V while the core power supply
voltage is 2.5V
± 0.125V. The I/Os are 5V tolerant.
RD
or
RD/WR
I
Microprocessor Interface Read or Read/Write Signal. When the Microprocessor Interface Mode Control,
µP
MODE, is a low the data from the address specified is placed on P(15:0) when RD is asserted (low) and CE
is asserted (low). When the
µP MODE control is high this input functions as a Read/Write control input. Data
is read from P(15:0) when high or written to the appropriate register when low. See Microprocessor Interface
Section.
µP MODE
I
Microprocessor Interface Mode Control. This pin is used to select the Read/Write mode for the Microprocessor
Interface. Internally pulled down. See Microprocessor Interface Section.
CE
I
Microprocessor Interface Chip Select. Active low. This pin has the same timing as the address pins.
INTRPT
O
Microprocessor Interrupt Signal. Asserted for a programmable number of clock cycles when new data is
available on the selected Channel.
Pin Descriptions (Continued)
NAME
TYPE
DESCRIPTION
ISL5216


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