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Agilent 84904, 6, 7K/L Programmable Step Attenuators
Data Sheet
Excellent repeatability High accuracy Excellent reliability, long life Features and description
* DC to 26.5 GHz, DC to 40 GHz frequency coverage * Optional calibration data * 0 to 11 dB, 70 dB, 90 dB * 1 dB steps, 10 dB steps * Excellent repeatability * High accuracy * Excellent reliability, long life * Exceptionally low insertion loss These attenuators offer repeatability of better than 0.03 dB and excellent life (greater than 5 million switching cycles per section). This family of programmable step attenuators offers coaxial measurements to 26.5 GHz (K models) or to 40 GHz (L models), in a compact, rugged design. The first model in this family is the Agilent Technologies 84906K/L, which offers outstanding
performance with an attenuation range of 0 to 90 dB in 10 dB steps. Other models include the Agilent 84904K/L, with 0 to 11 dB of attenuation in 1 dB steps, and the Agilent 84907K/L, with 0 to 70 dB of attenuation in 10 dB steps. This latest design evolution sets new standards for size and performance. High attenuation accuracy and low SWR are achieved through the use of miniature thin-film attenuation cards composed of high-stability tantalum nitride film on a sapphire substrate. Insertion loss performance is out4 3 Insertion Loss 2 (dB) 1 (.8) (.6) 0 10 84904/6K (1.9) (1.4) 84907K 20 30 Frequency (GHz) 40
standing, with less than 2 dB of loss at 26.5 GHz and only 2.4 dB at 40 GHz (figure 1). The compact size of the units, 35% smaller than the 8495/7 (26.5 GHz) family, allows for easy integration into instruments and ATE systems. This family of step attenuators offers three connector types. For operation to 40 GHz, the 84904/6/7L models offer either the 2.4 mm connector, which is recommended for top performance and for rugged and repeatable connections, or the 2.92 mm connector, which is compatible with SMA and 3.5 mm connectors but is more delicate. For operation to 26.5 GHz, the 84904/6/7K models offer the 3.5 mm connector. This connector is compatible with SMA and 2.92 connectors, but is more rugged. Each model in the 84904/6/7K and L family comes with two female connectors (standard) or may be ordered with one female and one male connector for easy insertion into a microwave chain or to combine the 1 dB step
84904/6L (2.4) (1.8) 84907L
Figure 1. Insertion loss
84904 with a 10 dB step 84906 or 84907 to cover an attenuation range of 121 dB or 81 dB in 1 dB steps. Individual calibration data reports of attenuation and SWR are available. This data, measured with an Agilent automatic network analyzer, can be ordered as Option 8490XX-UK6.
Selection switching
Figure 2 shows one attenuator section schematic. Each section utilizes one solenoid with dual coil windings, one coil to switch in the attenuator card (e.g. 10 dB) and one coil to switch in the thru line (0 dB).
negative voltage or ground. Figure 4 defines the pin assignments and wire color code for the 11764-60001/60002/ 60003 drive cables. Table 1 is a solenoid drive pin and attenuation guide. Table 2 (on page 4) defines recommended attenuator section activation. As a section is switched, the internal contacts of the activated coil open, thus shutting off current flow. At the same time, the internal contacts for the other coil close so that it can be activated when desired. Figure 3 shows a section that has been switched to the attenuator card position (note the closed thru line coil contact). The switching is "breakbefore-make" type, thus a momentary interruption of the RF signal occurs at switching. Although all sections can be switched simultaneously, the attenuator driver must not allow both pins of the same section (e.g. Section 1, pins 1 and 2) to be activated concurrently, or else that section would cycle rapidly. All terminals are "floating," so bipolar or unipolar power supplies can be used.
Attenuation switching and control
These units feature the same
small solenoids and switching circuits as the Agilent Technologies 8494/5/6/7 step attenuator family. Switching time is a maximum of 20 milli-seconds, including contact settling time. Once switched, the units are latched with permanent magnets, capable of withstanding shocks over 10 Gs. The solenoids automatically disconnect after switching, which minimizes the attenuators' power requirements and simplifies the driver circuit design (figure 3). Solenoids are available in either 24 volt (standard, Option 8490xx-024), 15 volt (Option 8490xx-015), and 5 volt (Option 8490xx-011) ranges to fit your instrument or system requirements. The units come equipped with 10-pin DIP headers for connecting dc control lines. Available accessories include a 203 mm (8 inch) or 406 mm (16 inch) ribbon cable with DIP-type connectors that is compatible with standard 14pin DIP IC sockets (11764-60002 or 11764-60003, respectively). Alternatively, a 1524 mm (5 foot) cable with free wires for direct soldering (1176460001), or a 1524 mm (5 foot) drive cable that connects to the 11713B/C attenuator/ switch driver, allowing for easy integration into GPIB-controlled automatic test systems (11764-60004), may be ordered.
RF Connector Drive Pin (e.g., pin 6) Internal Coil Contacts Typical Thru Line Pin External Driver (e.g., pin 5) To next Section RF Input Attenuation Card RF to next Section of Output
Figure 2. Section electrical diagram With positive voltage applied to the common pin, the state (attenuator card or thru line) of a particular section is determined by connecting its attenuator card pin or thru pin to a
LED Indicator Circuit +5V 0.13K LED
5082-4880
0.62K Driver 4.22K Drive Cable
Attenuator Section To next Section Thru Line Drive Pin Internal Coil Contacts
(DM7406N*)
Switch Driver Circuit TTL Input +5V +24V B A
Inverter
(DM7404N*)
IC Relay Driver
(DS75452N*)
RF Connector Drive Pin Thru Line RF In 4.22K 0.62K
TTL Indicator Circuit
*Fairchild Semiconductor part numbers, also supplied by other vendors: NOTE: Additional circuit design information may be required from the component manufacturers.
RF to next Section or Output
TTL Output Inverter
(DM7404N*)
D
Attenuation Card
Figure 3. Driver and indicator circuits for one section of an Agilent 84904, 6, 7 K/L
2
Attenuator DIP plug 1 2 9 10 RF connector
Typical driver circuit
11764-60001/2/3 wire colors 1. Brown 3. Orange 5. Green 7. Violet 9. White 2. Red 4. Yellow 6. Blue 8. Gray 10. Black
11764-60002/3 header 1 2 3 4 5 6 7 14 13 12 11 10 9 8 Brown Red Orange Yellow Green Blue Violet Gray White Black
14 Brown Red Orange Yellow Green Blue Violet Gray White Black 8
1
Figure 3 shows an economical TTL compatibility driver circuit for a single attenuation section which utilizes and IC relay driver and an inverter. A TTL "HI" input to the driver switches in the attenuation card, while a "LO" will activate the thru line for that section. This provides a complimentary driver for the section which assures that only one solenoid of the pair is activated at a time. Diode protection is required to protect the IC from the solenoid voltage flyback. Switch position can be indicated remotely by utilizing the open and closed states of the internal coil contacts. Connected at A and B in figure 3 are two indicator circuits, one providing a TTL output and one that activates an LED. These circuits will output a TTL "HI (LED lamp ON") if the attenuation card is in the RF circuit, and will output a TTL "LO" (LED lamp "OFF") if the thru line is in the RF circuit. Since current is drawn through the coil for these circuits, inadvertent switching is prevented by limiting the current to 5 mA. Agilent Technologies assumes no responsibility for the use of any circuits described herein and makes no representation or warranties, express or implied, that such circuits are free from patent infringement.
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11764-60001/2/3 14 pin header colors 1 14 2 Red 13 Brown 3 Yellow 12 Orange 4 Blue 11 Green 5 Gray 10 Violet 6 Black 9 White 7 8
Figure 4. Attenuator switching pinout
Table 1. Solenoid pin and attenuation guide
Section: Section 1 Section 2 Section3 Section 4
Model Number
Thru Line
Attn Card
10 2 6 2 10 2 6 2 1 2 6 2
Thru Line
0 5 7 11 0 5 7 11 0 5 7 11
Attn Card
20 8 8 5 20 8 8 5 2 8 8 5
Thru Line
0 4 9 3 0 4 9 3 0 4 9 3
Attn Card
30 9 10 9 40 9 10 9 4 9 10 9
Thru Line
0 6 11 4
Attn Card
30 7 12 10
84906K/L Attenuation (dB) 0 Actuating pin 1 11764-60004 plug Pin number 5 11764-60002/60003 flat Header pin number 13 84907K/L Attenuation (dB) 0 Actuating pin 1 11764-60004 plug Pin number 5 11764-60002/60003 flat Header pin number 13 84904K/L Attenuation (dB) 0 Actuating pin 1 11764-60004 plug Pin number 5 11764-60002/60003 flat Header pin number 13 Pin 10 is +V Supply
Drive cables
11764-60001 11764-60002 11764-60003 10 pin DIP to 60" long ribbon cable 10 pin DIP to 14 pin DIP, 8" long 10 pin DIP to 14 pin DIP, 16" long 10 pin DIP to 12 pin Viking connector, 60" long. Used with 11713A driver 10 pin DIP to (4) 4 pin BERG connectors, 30" long. Used with 87130A or 70611A driver
0 6 11 4
4 7 12 10
11764-60004
11764-60006
3
Table 2. Attenuator section activation guide
Recommended switching sequence: The following switching sequence (ie. which 30 dB section to use for the 84906K/L or which 4 dB section for the 84904K/L should be followed to insure performance to specs.
Attenuation selected
84906K/L Section 1 (10 dB) Section 2 (20 dB) Section 3 (30 dB) Section 4 (30 dB) 84907K/L Section 1 (10 dB) Section 2 (20 dB) Section 3 (40 dB) 84904K/L Section 1 (1 dB) Section 2 (2 dB) Section 3 (4 dB) Section 4 (4 dB) 0 dB 1 dB X X 2 dB 3 dB X X X X 4 dB 0 dB 10 dB X X 20 dB 30 dB X X X 5 dB X X X X 6 dB 7 dB X X X X X X X 40 dB 50 dB X X X 8 dB 0 dB 10 dB X X X X 20 dB 30 dB 40 dB X X X X X 60 dB X X 70 dB X X X 9 dB X X X X 10 dB 11 dB X X X X 50 dB 60 dB 70 dB X X X X 80 dB 90 dB X X X X
Switching notes: Pins relate to 10-pin attenuator header as shown (Table 1), NOT terminating connector on any attached drive cable. Solenoids are magnetic latching type; drive voltage may be removed after switching. Current is self-interrupting in less than 20 ms.
4
GPIB attenuator/switch driver
Employing programmable step attenuators and switches in an automatic test system becomes an easy task when the Agilent 11713B/C attenuator/ switch driver is specified into the system. The 11713B/C has all of the necessary features to provide GPIB, USB, or LAN control of up to four programmable attenuators of the 84904/6/7 series, and concurrently up to four electromechanical switches (e.g., the 8671B or 8762 Series). The 11713B/C includes an integral power supply (with short circuit protection) that can simultaneously provide 125 millamps at 24 volts to all contacts for control of the attenuators and switches, so no external power supply is needed. Connecting between the 11713B/C and the 84904/6/7 step attenuators is easy with the 11764-60004 drive cable. The 11713B/C also features convenient front panel keys so the user can manually activate the individual attenuation sections and switches when in the "local" mode. Switching time for the drivers is less than 10 milliseconds.
Optional calibration data for the Agilent 84904/6/7
Use of calibration data (i.e., accuracy, recorded, data of a device's characteristics) has always been an effective means of reducing measurement uncertainty at RF and microwave frequencies. Step attenuators have long been used as reference standards in the measurement of gain, attenuation, and receiver sensitivity. Since the accuracy specifications include margins for frequency response and unit-to-unit variations, calibration data can improve overall measurement uncertainty. Calibration data is available as Option 8490xx-UK6 and is generated from measurements made by an Agilent network analyzer.
Option 8490xx-UK6 provides a tabular list of attenuation and reflection coefficients in 250 MHz steps from 1500 MHz to 40 GHz. Measurements are traceable to NIST (National Institute of Standards and Technology, formerly NBS) standards and feature very low measurement uncertainties (See tables 3 and 4). For devices with option 8490xx-006 and option 8490xx-106, option 8490xx-UK6 and NIST traceability are not available. Table 3. Agilent 84904/6/7K/L reflection coefficient data uncertainty
Frequency Range (GHz) dc to 12.4 14.4 to 26.5 26.5 to 34 34 to 40 .017 .023 .025 .028
Table 4. Agilent 84904/6/7K/L attenuation data uncertainties
Attenuation (dB) 0 10 20 30 40 50 60 70 80 90 dc to 20 GHz 0.12 0.16 0.16 0.17 0.32 0.36 0.36 0.52 0.50 0.66 20 to 26.5 GHz 0.12 0.24 0.25 0.30 0.47 0.54 0.54 0.72 0.52 0.91 26.5 to 40 GHz 0.15 0.30 0.30 0.30 0.30 0.30 0.30 0.35 0.60 1.05
5
Attenuator setting
Attenuation accuracy (dB; referenced from 0 dB setting):
84907K/L 84906K/L Attenuator setting Frequency range dc to 40 GHz 2 10 0.5 20 0.6 30 0.7 40 1.0 50 1.2 60 1.6 70 1.8 80 2.7 90 2.9
84904K/L Attenuator setting (dB) Frequency range dc to 18 GHz 18 to 26.5 GHz 26.5 to 40 GHz2 1 0.35 0.40 0.60 2 0.45 0.50 0.60 3 0.55 0.70 0.80 4 0.55 0.70 0.80 5 0.55 0.70 0.80 6 0.55 0.70 0.90 7 0.60 0.80 1.10 8 0.60 0.80 1.10 9 0.65 0.85 1.20 10 0.70 0.90 1.30 11 0.80 1.10 1.50
1 Step-to-step accuracy is the maximum variation from the nominal step size when changing attenuation values. It is a second specification on accuracy, and is used in combination with the absolute accuracy specifications to limit maximum allowable variation from nominal. Typical step-to-step accuracy for the 84906L and 84907L is 0.6 dB to 26.5 GHz, 0.9 dB to 40 GHz; for the 84904L is 0.3 to 26.5 GHz, 0.4 to 40 GHz. 2 Attenuation accuracy to 26.5 GHz for K models.
Specifications
Insertion loss (in dB 0 dB position, f = freq. in GHz) 84904K/L (0.8 + 0.04xf) 84906K/L (0.8 + 0.04xf) 84907K/L (0.6 + 0.03xf) SWR L models 84904L 84904L 84904L 84904L 84906L 84906L 84906L 84906L 84907L 84907L 84907L 84907L Connector Option with 101 with 006 with 100 with 106 with 101 with 006 with 100 with 106 with 101 with 006 with 100 with 106 dc to 12.4 GHz 1.3 1.5 1.3 1.5 1.3 1.5 1.3 1.5 1.25 1.4 1.25 1.4 12.4 GHz to 34 GHz 1.7 1.9 1.7 1.9 1.7 1.9 1.7 1.9 1.5 1.7 1.5 1.7 34 GHz to 40 GHz 1.8 2.0 1.8 2.0 1.8 2.0 1.8 2.0 1.7 1.9 1.7 1.9 SWR K models 84904K 84904K 84906K 84906K 84907K 84907K Connector Option 004 104 004 104 004 004 dc to 12.4 GHz 1.3 1.3 1.3 1.3 1.25 1.25 12.4 GHz to 26.5 GHz 1.7 1.7 1.7 1.7 1.5 1.5
Attenuation temperature coefficient Less that 0.0001 dB/dB/C Power sensitivity 0.001 dB/Watt RF Input power (max.) 1 Watt average, 50 Watts peak (10 s max. pulse width) Life (min.) 5 million cycles per section Repeatibility 0.03 dB, typical
Environmental capabilities (Up to 5 million cycles) Temperature, operating -20C to +75C Temperature, non-operating -55C to +85C Altitude, operating 4,570 meters (15,000 ft.) Altitude, non-operating 13,700 meters (50,000 ft.) Humidity Cycling 5 days, 40C at 95% RH with condensation
Shock operating 10 Gs, six ms, on six sides, three blows Shock, non-operating 500 Gs, 1.8 ms, in six directions Vibration, operating 5 Gs, 34-2000 Hz EMC Radiated interference is within the requirements of MIL-STD-461 method RE02, VDE 0871 and CISPR Publication II
6
Mechanical information
Net weight 84904K/L 291 grams (10.3 oz) 84906K/L 291 grams (10.3 oz) 84907K/L 229 grams (8.1 oz)
Mounting position (any) RF connectors 2.4 mm connectors standard, L models only 2.92 mm (SMA compatible), L models only 3.5 mm (SMA compatible), K models only Switching speed Maximum 20 msec including settling time
Switching Current1 125 mA (at 24 V) 188 mA (at 15 V) 325 mA (at 5 V) Nominal coil impedance
Solenoids Option 024
Coil voltage 24 V (20 to 30 V) 15 V (13 to 22 V) 5V (4.5 to 7 V)
190
Option 015
80
Option 011
17
1 Current per section; approximately 10 msec duration before internal contacts open the coil circuit
94 (3.7) 73.3 (2.89) 41.8 (1.65) *6.6 (.26) 10.4 (.41) 84904,6K/L 5.8 (.23) 13.5 41.8 (1.65) *6.6 (.26) 10.4 (.41)
74.5 (2.9) 53.8 (2.1) 84907K/L 5.8 (.23) 13.5 22.2 (.87)
11.5 7.8 22.5
Mounting holes 4X M3X0.5X6 deep O 2.6 thru
Mounting holes 4X M3X0.5X6 deep O 2.6 thru
11.1 (.44)
104.3 (4.11) 41.5 (1.63) 2.4 mm Connector STD or: 2.92 mm Connectors (SMA Compatible) Option 006 * L models - 6.6 (0.3; 2.4 mm (f) connector (f) L models, Opt. 006 - 2.92 mm (f) connector (SMA compatible) K models - 9.8 (0.4); 3.5 mm (f) connector (SMA compatible) ** L models - 6.6 (0.3); 2.4 mm (f) connector STD L models, Opt. 006 - 2.92 mm (f) connector (SMA compatible) L models, Opt. 100 - 5.7 (0.2); 2.4 mm male connector L models, Opt. 106 - 7.4 (0.3); 2.92 mm male connector K models - 9.8 (0.4); 3.5 mm (f) connector (SMA compatible) K models, Opt. 104 - 10.6 (0.4); 3.5 mm (m) connector 41.5 (1.63)
84.7
2.4 mm Connector STD or: 2.92 mm Connectors (SMA Compatible) Option 006
Figure 5. Dimensions are in millimeters and inches.
7
Ordering information
Programmable step attenuators 84904K 0 to 11 dB, 1 dB steps; dc to 26.5 GHz 84904L 0 to 11 dB, 1 dB steps; dc to 40.0 GHz 84906K 0 to 90 dB, 10 dB steps; dc to 26.5 GHz 84906L 0 to 90 dB, 10 dB steps; dc to 40.0 GHz 84907K 0 to 70 dB, 10 dB steps; dc to 26.5 GHz 84907L 0 to 70 dB, 10 dB steps; dc to 40.0 GHz
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Options
To add options to a product, use the following ordering scheme: Model: 84904/6/7x (x = K, L) Model options: 84904/6/7x-opt#1 or 84904/6/7x-opt#2 Supply voltage (must choose one) 84904/6/7x-011 5 V dc supply voltage 84904/6/7x-015 15 V dc supply voltage 84904/6/7x-024 24 V dc supply voltage (standard option) RF connectors (must choose one) 84904/6/7K-004 * 3.5 mm female connector, 3.5 mm female connector (standard option) 84904/6/7K-104 * 3.5 mm male connector, 3.5 mm female connector 84904/6/7L-006 * 2.92 mm female connector, 2.92 mm female connector (UK6 not available with this option) 84904/6/7L-100 * 2.4 mm male connector, 2.4 mm female connector 84904/6/7L-101 * 2.4 mm female connector, 2.4 female connector (standard option) 84904/6/7L-106 * 2.92 mm male connector, 2.92 mm female connector (UK6 not available with this option) Calibration documentation (optional) 84904/6/7x-UK6 Calibration data Accessories (optional) 11764-60001 * 10-pin dip plug (for attenutor connection) to 1524 mm (5 foot) ribbon cable 11764-60002 * 203 mm (8 inch) ribbon cable with 14-pin headers, female 10-pin receptacle 11764-60003 * 406 mm (16 inch) ribbon cable with 14-pin headers, female 10-pin receptacle 11764-60004 * Interconnect cable 10-pin dip plug to "Viking" connector (for use with 11713B/C)
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Revised: March 27, 2008
Product specifications and descriptions in this document subject to change without notice. (c) Agilent Technologies, Inc. 2002, 2004, 2005, 2008 Printed in USA, May 15, 2008 5963-6944E

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