378 Chapter8
ADC/Interface Section
Introduction
Introduction
The ADC/Interface section includes the A1A1 keyboard, A1A2 RPG
(rotary pulse generator), A3 interface,
assemblies. Table 8-1 on page 379 lists signal versus pin numbers for
control cable W2. Figure 8-1 on page 380 illustrates the location of the
test connectors on A3.
Page
Keyboard/RPG Problems ..............................................page 382
Keyboard Interface ......................................................page 382
RPG Interface ..............................................................page 383
Triggering or Video Gating Problems ..........................page 385
Preselector Peaking Control (Real Time DAC) ............page 388
Flatness Control (RF Gain DACs) ................................page 389
A3 Assembly Video Circuits ........................................ page 391
Log Offset/Log Expand ...............................................page 393
Video MUX ..................................................................page 394
Video Filter ..................................................................page 395
Video Filter Buffer Amplifier ......................................page 396
Positive/Negative Peak Detectors ...............................page 397
Peak Detector Reset ....................................................page 398
Rosenfell Detector .......................................................page 399
ADC MUX ....................................................................page 400
Variable Gain Amplifier (VGA) ..................................page 402
Track and Hold ............................................................page 402
A3 Assembly ADC Circuits ...........................................page 403
ADC Control Signals ...................................................page 403
ADC Start/Stop Control ..............................................page 404
ADC ASM ....................................................................page 405
ADC ..............................................................................page 405
Ramp Counter .............................................................page 406
A3 Assembly Control Circuits ......................................page 407
Analog Bus Drivers .....................................................page 407
Analog Bus Timing ......................................................page 408
Interface Strobe Select ................................................page 409
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