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KAT1108E датащи(PDF) 5 Page - Integrated Device Technology |
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KAT1108E датащи(HTML) 5 Page - Integrated Device Technology |
5 / 17 page 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 |
Аналогичный номер детали - KAT1108E |
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Аналогичное описание - KAT1108E |
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