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961104-6404-AR Datasheet(PDF) 8 Page - Integrated Device Technology |
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961104-6404-AR Datasheet(HTML) 8 Page - Integrated Device Technology |
8 / 22 page 6 Bit Digital Step Attenuator 1 MHz to 4000 MHz Glitch-FreeTM, Digital Step Attenuator 8 Rev 1, May 2017 IDTF1912NCGI Datasheet Serial Mode Default Startup Condition: When the device is first powered up it will default to the Maximum Attenuation of 31.5 dB independent of the VMODE and parallel pin [D5:D0] conditions. Table 4 - Default Control Word for the Serial Mode D5 (MSB) D4 D3 D2 D1 D0 (LSB) Attenuation (dB) 1 1 1 1 1 1 31.5 PARALLEL CONTROL MODE For the F1912 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 13) is less than VIL and LE (pin 5) is greater than VIH. In this mode the device will immediately react to any voltage changes to the parallel control pins [pins 1, 15, 16, 17, 19, 20]. Use direct parallel mode for the fastest settling time. Latched Parallel Mode: Latched Parallel Mode is selected when VMODE is less than VIL and LE (pin 5) is toggled from less than VIL to greater than VIH. To utilize Latched Parallel Mode: Set LE < VIL Adjust pins [pins 1, 15, 16, 17, 19, 20] 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 pins D5 – D0. Latched Parallel Mode implies a default state for when the device is first powered up with VMODE < VIL and LE < VIL. In this case the default setting is MAXIMUM Attenuation. Table 5 - Truth Table for the Parallel Control Word D5 D4 D3 D2 D1 D0 Attenuation (dB) 0 0 0 0 0 0 0 0 0 0 0 0 1 0.5 0 0 0 0 1 0 1 0 0 0 1 0 0 2 0 0 1 0 0 0 4 0 1 0 0 0 0 8 1 0 0 0 0 0 16 1 1 1 1 1 1 31.5 |
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