Model 6230 (147)
Model 6230 is a general-purpose 32-channel narrowband digital receiver VIM-4 module. It attaches directly to VIM-compatible processor boards and connects directly to all four processors.
*Four 65 or 80 MHz, 14-bit A/D converters * Front panel FPGA I/O connector *All downconverters can select any of the four inputs *90 MHz input bandwidth *3.2 kHz to 1.6 MHz output bandwidths for ƒS = 64 MHz *Front panel clock and sync bus to sync multiple boards
The Model 6230 accepts four analog RF
inputs on front panel SMA connectors. Input
amplifier bandwidth of 90 MHz supports
direct IF undersampling. Each input is
amplified and, optionally, lowpass filtered
to remove out-of-band signals and prevent
aliasing. The filters may be bypassed for
Optionally available, transformer-coupled
inputs reduce distortion for input signals
above 10 MHz and are recommended for IF
Each of the four inputs is then digitized
by a 14-bit A/D converter which is capable
of operating at sample rates up to 65 MHz
(Analog Devices AD6644) or, optionally,
80 MHz (AD6645). The A/D converter
clock can be driven from an internal 64 MHz
or 80 MHz crystal oscillator or from an external
sample clock supplied through a front
panel SMA connector.
The 6230 includes eight Graychip
GC4016 quad narrowband digital
downconverter chips. The maximum input
sampling rate for the GC4016 is 80 MHz.
Each device includes four independently
tuned channels capable of center frequency
tuning from DC to 32 MHz, and with output
bandwidths ranging from 3.2 kHz to
1.6 MHz (for 64 MHz sample clock).
Each GC4016 accepts four 14-bit parallel
inputs from the four A/D converters. Internal crossbar switches allow all 32 receiver
channels on the board to select any of the
four A/D inputs for flexible switching.
The front panel clock and sync bus allow
one 6230 to act as a master, driving the
sample clock out to a front panel cable bus
using LVDS differential signaling. Multiple
slaves can then be clocked synchronously
with the master. Additional sync lines allow
synchronization of the local oscillator phase,
frequency switching, decimating filter phase,
and FIFO data collection on multiple 6230’s.
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