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For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com 5 5 - 22 Digital Control Voltages Truth Table Serial Data Input Attenuation Setting RF1 - RF2 C1 C2 C4 C8 C16 High High High High High Reference I.L. Low High High High High 1 dB High Low High High High 2 dB High High Low High High 4 dB High High High Low High 8 dB High High High High Low 16 dB Low Low Low Low Low 31 dB Max. Atten. Any combination of the above states will provide an attenuation approximately equal to the sum of the bits selected. State Vcc = +5V Vcc = +3V Low 0 to 1.3V 0 to 0.7V High 3.5 to 5V 2.3 to 3V -1.2 -0.8 -0.4 0 0.4 0.8 1.2 0.5 1 1.5 2 2.5 3 3.5 4 FREQUENCY (GHz) Worst Case Step Error Between Successive Attenuation States Timing Diagram Serial Input Truth Table Latch Enable Shift Clock Reset Function X X L Shift register cleared X H Shift register clocked XH Contents of shift register transferred to Digital Attenuator Parameter Symbol Vcc = +5V Vcc = +3V Units Min. Max. Min. Max. Serial Input Setup Time ts 20 - 100 - ns Hold time from Serial Input to Shift Clock th 0 - 5 - ns Setup time from Shift Clock to Latch Enable tlsup 40 - 100 - ns Propagation delay, Latch Enable to C1 through C16 tpd - 30 - 70 ns Setup time from Reset to Shift Clock -20 - 50 - ns Clock Frequency (1/tclk) fclk - 30 - 10 MHz Timing HMC271LP4 / 271LP4E v03.0809 1 dB LSB GaAs MMIC 5-BIT SERIAL CONTROL DIGITAL ATTENUATOR, 0.7 - 3.7 GHz |
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