SP43701 Datasheet, PDF (10/12 Pages) SIPAT Co,Ltd – 50 Ω RF Digital Attenuator

SP43701
Product Specification
Evaluation Kit
The Digital Attenuator Evaluation Kit board was
designed to ease customer evaluation of the
SP43701 Digital Step Attenuator.
Figure 22. Evaluation Board Layout
SIPAT Specification 101-0312
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 (P/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 (P/S) select switch to the Parallel (or
left) position. The LE pin on the Serial header must
be tied to V_DD. Switches D0-D6 are SP3T 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. 21 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.
Note: Reference Fig. 23 for Evaluation Board Schematic
Serial-Addressable Programming Procedure
Position the Parallel/Serial (P/S) select switch to
the Serial (or right) position. Prior to
programming, the user must define an address
setting using the ADD header pin. Jump the
middle pins on the ADD header A0-A2 (or lower)
row of pins to set logic high, or jump the middle
pins to the upper row of pins to set logic low. If
the ADD pins are left open, then 000 become the
default address. 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 Serial-Addressable
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 latched-parallel programming, the
procedure is identical to direct-parallel except now
the LE pin on the Serial header must be logic low
as the parallel bits are applied. The user must then
pulse LE from 0V to V_DD and back to 0V to latch the
programming word into the DSA. LE must be logic
low prior to programming the next word.
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