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Talon RTX 2767 Operating Manual
3.2
Pentek Cobalt Model 78651 LEDs (continued)
3.2.7
3.2.8
3.3
Pentek Cobalt Model 78671 Input and Output Connections
Model 78671 provides six SSMC coaxial connectors for input/output of clock and
analog signals, and a 26−pin sync bus input/output connector. These connectors are
described in the following subsections.
3.3.1
3.3.2
3.3.3
3.3.4
DAC Underrun LED − Red
The red UR LED illuminates when the DAC5688 FIFO is out of data.
ADC Overload LEDs − Red
These are two red OV overload LEDs, one for each A/D input.
Clock Input Connector − CLK IN
Model 78671 has one SSMC coaxial connector, labeled CLK IN, for input of
an external sample or reference clock. The external clock signal must be a
sine wave or square wave of 0 dBm to +10 dBm, AC−coupled, into 50 ohms.
This input accepts a 10 to 1250 MHz sample clock or a 0 or 200 MHz refer−
ence clock.
Trigger Input Connectors − TRIG
Model 78671 has one SSMC coaxial connector, labeled TRIG, for input of an
external gate or trigger TTL signal.
NOTE:
The front panel TRIG input is 5V tolerant but it must NOT have
any negative voltage applied.
Analog Output Connectors − OUT 1, 2, 3, 4
Model 78671 has four SSMC coaxial connectors for analog signal outputs,
labeled OUT 1, 2, 3, and 4: one for each DAC3484 output.
The analog output signal is within the range of +4 dBm. This output is
driven by an RF transformer into 50 ohm output impedance.
Sync Bus Connectors − SYNC A, SYNC B
The front panel has two 19−pin Sync connectors, labeled SYNC A and
SYNC B, which provide sync and gate inputs for DAC timing control. These
pins are differential 2.5V CML input signals.
Page 15
Rev.: 1.0
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