HP 33304, 33305 schematic

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Agilent 33304/5 Programmable Step Attenuators
Data Sheet
Features and description
Rapid switching (less than 0.05 second)
Broadband (DC to 18 GHz)
Two ranges and step sizes
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The 33300 Programmable Step Attenuators provide a fast and precise means for electrically controlling the level of signal attenuation in automatic test systems, receivers, and other RF equipment. They provide attenuation up to 110 dB in 1 or 10 dB steps over a frequency range of dc to 18 GHz.
The products are defined as:
Model no. Total attenuation Step size
dB dB 33304 11 1 33305 110 10
The 33300 series attenuators utilize a unique operating principle. Magnetic latching solenoids are used to switch individual attenuation elements (tantalum resistive films on sapphire substrates) into and out of contact with a 50-ohm transmission line. Each unit is comprised of three or four attenuation sections. By energizing the appropriate solenoid, any combination of these sections may be put across the 50-ohm transmission line to give the desired levels of attenuation.
The extreme stability of the sapphire tantalum attenuator pads, combined with the elimination of sliding contacts, gives rise to a product that has as number of important operational features. Among these are fast switching speed, excellent repeatability, compact size, long life, and high stability.
Magnetic latching solenoids move the transmission line into and out of contact with the sapphire attenuator elements. These solenoids are supplied with coils for 24-volt operation. The 24-volt coil can be run at up to 30 volts.
Because the solenoids are of the latching type, power need not be continuously maintained to keep the solenoid in either the in or the out position. It is sufficient to pulse the solenoid for 30 milliseconds at its rated voltage to change states. To change states the polarity across the terminals must be reversed. However, both terminals are “floating,” so either can be grounded. Thus, unipolar power supplies are sufficient for controlling these units.
For switching speeds faster than 30 ms, this pulse voltage can be increased. A maximum of double the rated voltage may be put across the solenoids in such cases, but pulse width should be limited to keep average solenoid power below 3.3 watts per section.
Indicator contacts, which allow the user to determine whether a given section is engaged or not, can be included. These contacts are in their open position when the appropriate attenuator cards are not engaged. The contacts close, and remain closed, when the appropriate card moves into contact with the transmission line.
The 33300 series is available with any combination of 3 mm, 7 mm or Type N connectors. A three-digit code specifies these options. The first digit is always 0. The second digit calls out port 1, the third, port 2. See figure 2 for details.
Description
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Figure 3. Outline drawings
Figure 2. Ordering example
Figure 1. Electrical diagram and programming table
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Electrical
Frequency range: DC-18 GHz Characteristic impedance: 50 ohms Attenuation ranges:
Model Range (dB) Step size (dB) 33304 0–11 1
33305 0–110 10
Life, minimum: 1,000,000 steps each section. Power sensitivity: 0.001 dB/dB/ watt. Attenuation temperature coefficient: Less than 0.0001 dB/dB° C Repeatability, typical:
DC–12.4 GHz 0.03 dB
12.4–18 GHz 0.05 dB
Attenuation accuracy (±dB) referenced from 0 dB setting:
33304
DC–4 GHz 0.2 0.2 0.3 0.3 0.3 0.3 0.4 0.4 0.4 0.4 0.5 4–12.4 GHz 0.3 0.3 0.4 0.4 0.4 0.4 0.5 0.5 0.5 0.5 0.6
12.4–18 GHz 0.5 0.5 0.6 0.6 0.7 0.8 0.8 0.8 0.8 0.8 0.9
33305
Frequency range Attenuator setting (dB) DC–12.4 GHz 0.5 0.7 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0 3.3
12.4–18 GHz 0.6 0.8 1.2 1.6 2.0 2.4 2.8 3.2 3.6 4.0 4.4
Note: The attenuation sections 3 and 4 of both the 33304 and 33305 have equal attenuation values. There are attenuator configurations which require only one of those to be activated. The above accuracy specifications are guaranteed only when section 3 is used in preference to section 4.
VSWR: 33304 and 33305
Frequency range Connector type
SMA Type N 7 mm
DC–8 GHz 1.5 1.45 1.4 8–12.4 GHz 1.6 1.55 1.5
12.4–18 GHz 1.9 1.8 1.7
Solenoid voltage and nominal coil impedance:
Models Solenoid voltage Coil impedance 33304B/D 24 to 30 Vdc 262 ohms
33305B/D 0.192 ohms
Power required to switch one section: 3.3 watts.
(Continuous operation of solenoids requires 10 watts dissipation in heat sink.)
Environmental
Temperature, non-operating: –40° C to +85° C.
Temperature, operating: –20° C to 55° C. Altitude, operating: 25,000 ft. Vibration, operating: 5 – 500 – 5 Hz, 15 min./cycle, 3 hours/axis. 0.100-inch D.A. to 31 Hz,
5 g’s to 500 Hz, with and without power applied to the relays in both positions.
Ordering information
See figure 2 for ordering information.
Specifications
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© Agilent Technologies, Inc. 2001, 2006 Printed in USA, July 13, 2006 5953-2354
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