Agilent Technologies 856290216 Interface Strobe Select, Demultiple er A3U410 Truth Table

11.Monitor A3U401B pin 7 (LIF-STB) with an oscilloscope or logic probe. This is the strobe for the A5 IF assembly.

12.Press (AMPLITUDE] and check that pulses occur when toggling between REF‘ LVL settings of -10 dBm and -20 dBm.

13.Monitor A3U401B pin 9 (LLOGSTB) with an oscilloscope or logic probe. This is the strobe for the A4 log amplifier/Cal oscillator assembly.

14.Press (Wj and check that pulses occur when toggling between LINEAR and

Lac mfm.

Interface Strobe Select

Refer to function block K of A3 Interface Assembly Schematic Diagram in the

HP 8560 E-Series Spectrum Analyzer Component Level Information.

Interface strobe select Assembly. Table 8-10 A3U500.

generates the various strobes used by circuits on the A3 Interface and Table 8-11 are the truth tables for demultiplexers A3U410 and

Table 8-10. Demultiple :er A3U410 Truth Table

Selected Output Line	IA1
Pin 15, LSCAN-KBD	L
Pin 14, LDACUl	H
Pin 13, LDACl	L
Pin 12, LDAC2	H
Pin 11, LDACS	L
Pin 10	H
Pin 9, LTIMER	L
Pin 7, LADC-REGl	H

IA2	IA3
L	L
L	L
H	L
H	L
L	H
L	H
H	H
H	H

Table 8-l 1. Demultiple :er A3U500 Truth Table

Selected Output Line	IA0
Pin 15, LSENSE-KBD	L
Pin 14, LINT-PRIOR	H
Pin 13, LADC-DATA1	L
Pin 12, LDAC-DATA0	H
Pin 11, HCNTR-LDO	L
Pin 10, HCNTR-LDl	H
Pin 9, LRPG-RD	L
Pin 7, LADC-REGO	H

IA1	IA2
L	L
L	L
H	L
H	L
L	H
L	H
H	H
H	H

8-30 ADC/lnterface Section