Product Specification

SP43503

Page 8 of 10

Evaluation Kit

The Digital Attenuator Evaluation Kit board was

designed to ease customer evaluation of the

SP43503 Digital Step Attenuator.

Direct-Parallel Programming Procedure

For automated direct-parallel programming,

connect the test harness provided with the EVK

from the parallel port of the PC to the J1 & Serial

header pin and set the D0-D6 SP3T switches to

the ‘MIDDLE’ toggle position. Position the

Parallel/Serial (

P̅/S) select switch to the Parallel

(or left) position. The evaluation software is

written to operate the DSA in either Parallel or

Serial-Addressable Mode. Ensure that the

software is set to program in Direct-Parallel mode.

Using the software, enable or disable each setting

to the desired attenuation state. The software

automatically programs the DSA each time an

attenuation state is enabled or disabled.

For manual direct-parallel programming,

disconnect the test harness provided with the EVK

from the J1 and Serial header pins. Position the

Parallel/Serial (

P̅/S) select switch to the Parallel

(or left) position. The LE pin on the Serial header

switches which enable the user to manually

program the parallel bits. When any input D0-D6

is toggled ‘UP’, logic high is presented to the

parallel input. When toggled ‘DOWN’, logic low is

presented to the parallel input. Setting D0-D6 to

the ‘MIDDLE’ toggle position presents an OPEN,

which forces an on-chip logic low. Table 9 depicts

the parallel programming truth table and Fig. 16

illustrates the parallel programming timing

diagram.

Latched-Parallel Programming Procedure

For automated latched-parallel programming, the

procedure is identical to the direct-parallel

method. The user only must ensure that Latched-

Parallel is selected in the software.

For manual latched-parallel programming, the

procedure is identical to direct-parallel except now

the LE pin on the Serial header must be logic low

Figure 17. Evaluation Board Layout

as the parallel bits are applied. The user must

latch the programming word into the DSA. LE

must be logic low prior to programming the next

word.

Serial Programming Procedure

Position the Parallel/Serial (

P̅/S) select switch to

the Serial (or right) position. The evaluation

software is written to operate the DSA in either

Parallel or Serial Mode. Ensure that the software

is set to program in Serial mode. Using the

software, enable or disable each setting to the

desired attenuation state. The software

automatically programs the DSA each time an

attenuation state is enabled or disabled.

Note: Reference Figure 18 for Evaluation Board Schematic

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