Digital Step Attenuator
DAT-31R5-PP+
Power-up Control Settings
The DAT-31R5-PP+ always assumes a specifiable attenuation setting on power-up, allowing a known at-
tenuation state to be established before an initial parallel control word is provided.
When the attenuator powers up with LE=0, the control bits are automatically set to one of four possible val-
ues .These four values are selected by the two power-up control bits,PUP1 and PUP2 ,as shown in table 3:
(Power-Up Truth Table, Parallel Mode).
Table 3. Power-Up Truth Table, Parallel Mode
Attenuation State
Reference
8 (dB)
PUP1
PUP2
LE
0
0
0
1
1
0
1
0
1
0
16 (dB)
0
31 (dB)
0
Defined by C0.5-C16
(See Table 1-Truth Table)
X (Note 1)
X (Note 1)
1
Note 1: PUP1 and PUP2 Connection may be 0, 1, GROUND, or not con-
nect, without effect on attenuation state.
Power-Up with LE=1 provides normal parallel operation with C0.5-C16, and PUP1 and PUP2 are not active.
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MINI [ MINI-CIRCUITS ]
