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KAT1108E датащи(PDF) 5 Page - Integrated Device Technology

номер детали KAT1108E
подробное описание детали  7-bit 0.25 dB Digital Step Attenuator
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производитель  IDT [Integrated Device Technology]
домашняя страница  http://www.idt.com
Logo IDT - Integrated Device Technology

KAT1108E датащи(HTML) 5 Page - Integrated Device Technology

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7-bit 0.25 dB Digital Step Attenuator
150 MHz to 4000 MHz
Glitch-Free
TM Digital Step Attenuator
5
Rev1 March 2012
IDTF1950
DATASHEET
PARALLEL CONTROL MODE
The user has the option of running in one of two parallel modes: Direct Parallel Mode or Latched Parallel
Mode.
DIRECT PARALLEL MODE:
Direct Parallel Mode is selected when VMODE (pin 3) is < VIL and LE (pin 16) is > VIH. In this mode the
device will immediately react to any voltage changes to the parallel control pins [pins 19, 20, 21, 22, 23,
24, 1]. Use direct parallel mode for the fastest settling time.
LATCHED PARALLEL MODE:
Latched Parallel Mode is selected when VMODE (pin 3) is < VIL and LE (pin 16) is toggled from < VIL to > VIH
To utilize Latched Parallel Mode:
Set LE < VIL
Adjust pins [19, 20, 21, 22, 23, 24, 1] to the desired attenuation setting. (Note the device will not
react to these pins while LE < VIL.)
Pull LE > VIH. The device will then transition to the attenuation settings reflected by these pins.
Latched Parallel Mode implies a default state for when the device is powered up with VMODE < VIL and LE < VIL.
In this case the default setting is MAXIMUM Attenuation.
LATCHED PARALLEL MODE TIMING DIAGRAM: (Note the Timing Spec Intervals in Blue)
LATCHED PARALLEL MODE TIMING TABLE:
Interval
Symbol
Description
Min
Spec
Max
Spec
Units
A
Serial to Parallel Mode Setup Time
100
nsec
B
Parallel Data Hold Time
10
nsec
C
LE minimum pulse width
10
nsec
D
Parallel Data Setup Time
10
nsec
D[6:0]
Data Word
Latched into
Active Register
LE
VMODE
Spec
Intervals
A
D
C
B


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