Agilent 84907K 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
• 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 out-
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
Agilent 84904, 6, 7K/L
Programmable Step Attenuators
Data Sheet
Figure 1. Insertion loss
4
Insertion
Loss
(dB)
(.8) (.6)
3
2
1
0
84904/6K (1.9)
10 20
Frequency (GHz)
(1.4) 84907K
30
84904/6L
(2.4)
(1.8)
84907L
40
2
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.
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 (11764-
60001), or a 1524 mm (5 foot) drive cable that connects to the 11713A attenuator/ switch driver, allowing for easy integration into GPIB-controlled automatic test systems (11764-60004), may be ordered.
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).
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
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.
Figure 3. Driver and indicator circuits for one section of an Agilent 84904, 6, 7 K/L
RF Connector
Drive Pin
Typical
External
Driver
RF Input
(e.g., pin 6)
Thru Line
Pin
(e.g., pin 5)
Attenuation
Card
Internal Coil Contacts
To next Section
next Section
of Output
RF to
LED Indicator Circuit
+5V
LED
5082-4880 (DM7406N*)
Switch Driver Circuit
TTL Input
+5V
Inverter
IC Relay Driver
(DM7404N*)
*National Semiconductor part numbers, also supplied by other vendors: NOTE: Additional circuit design information may be required from the component manufacturers.
(DS75451N*)
Driver
+24V
TTL Indicator Circuit
TTL Output
Inverter
(DM7404N*)
D
A
B
0.620.13
4.22
4.22K
0.62K
Attenuator Section
Drive Cable
RF In
Thru Line Drive Pin
Internal Coil Contacts
RF Connector Drive Pin
Thru Line
Attenuation Card
To next Section
RF to next Section or Output
3
Typical driver circuit
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.
Drive cables
11764-60001 10 pin DIP to 60” long
ribbon cable
11764-60002 10 pin DIP to 14 pin DIP,
8” long
11764-60003 10 pin DIP to 14 pin DIP,
16” long
11764-60004 10 pin DIP to 12 pin Viking
connector, 60” long. Used with 11713A driver
11764-60006 10 pin DIP to (4) 4 pin BERG
connectors, 30” long. Used with 87130A or 70611A driver
Attenuator
Figure 4. Attenuator switching pinout
Section: Section 1 Section 2 Section3 Section 4
Thru Attn Thru Attn Thru Attn Thru Attn
Model Number Line Card Line Card Line Card Line Card
84906K/L
Attenuation (dB) 0 10 0 20 0 30 0 30 Actuating pin 1 2 5 8 4 9 6 7 11764-60004 plug Pin number 5 6 7 8 9 10 11 12 11764-60002/60003 flat Header pin number 13 2 11 5 3 9 4 10
84907K/L
Attenuation (dB) 0 10 0 20 0 40 Actuating pin 1 2 5 8 4 9 11764-60004 plug Pin number 5 6 7 8 9 10 11764-60002/60003 flat Header pin number 13 2 11 5 3 9
84904K/L
Attenuation (dB) 0 1 0 2 0 4 0 4 Actuating pin 1 2 5 8 4 9 6 7 11764-60004 plug Pin number 5 6 7 8 9 10 11 12 11764-60002/60003 flat Header pin number 13 2 11 5 3 9 4 10
Pin 10 is +V Supply
Table 1. Solenoid pin and attenuation guide
DIP plug
12
910
RF connector
11764-60002/3 header
114 213 312 411 510 69 78
11764-60001/2/3
14 pin header colors 114
213
Red Yellow
312 411
Blue
510
Gray
6 9
Black
7 8
Brown Orange
Green Violet White
11764-60001/2/3 wire colors
1. Brown 2. Red
3. Orange 4. Yellow
5. Green 6. Blue
7. Violet 8. Gray
9. White 10. Black
Brown Red Orange Yellow Green Blue Violet Gray White Black
Brown
Red
Orange
Yellow
Green
Blue
Violet
Gray
hite
W
Black
14
1
8
7
4
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 0 dB 10 dB 20 dB 30 dB 40 dB 50 dB 60 dB 70 dB 80 dB 90 dB
Section 1 (10 dB) X X X X
Section 2 (20 dB) X X X X
Section 3 (30 dB) X X X X X X X
Section 4 (30 dB) XX XX
84907K/L 0 dB 10 dB 20 dB 30 dB 40 dB 50 dB 60 dB 70 dB
Section 1 (10 dB) X X X X
Section 2 (20 dB) X X X X
Section 3 (40 dB) X X X X
84904K/L 0 dB 1 dB 2 dB 3 dB 4 dB 5 dB 6 dB 7 dB 8 dB 9 dB 10 dB 11 dB
Section 1 (1 dB) X X X X X X
Section 2 (2 dB) X X X X X X
Section 3 (4 dB) X X X X X X X X
Section 4 (4 dB) XXX 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.
Table 2. Attenuator section activation guide
5
GPIB attenuator/switch driver
Employing programmable step atten­uators and switches in an automatic test system becomes an easy task when the Agilent 11713A attenuator/ switch driver is specified into the system.
The 11713A has all of the necessary features to provide GPIB control of up to two programmable attenuators of the 84904/6/7 series, and concur­rently up to two electro-mechanical switches (e.g., the 8671B or 8762 Series).
The 11713A 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 11713A and the 84904/6/7 step attenuators is easy with the 11764-60004 drive cable.
The 11713A 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 ± .017
14.4 to 26.5 ± .023
26.5 to 34 ± .025 34 to 40 ± .028
Attenuation (dB) dc to 20 GHz 20 to 26.5 GHz 26.5 to 40 GHz
0 ± 0.12 ± 0.12 ± 0.15 10 ± 0.16 ± 0.24 ± 0.30 20 ± 0.16 ± 0.25 ± 0.30 30 ± 0.17 ± 0.30 ± 0.30 40 ± 0.32 ± 0.47 ± 0.30 50 ± 0.36 ± 0.54 ± 0.30 60 ± 0.36 ± 0.54 ± 0.30 70 ± 0.52 ± 0.72 ± 0.35 80 ± 0.50 ± 0.52 ± 0.60 90 ± 0.66 ± 0.91 ± 1.05
Table 4. Agilent 84904/6/7K/L attenuation data uncertainties
Attenuator setting
Attenuation accuracy (±dB; referenced from 0 dB setting):
84907K/L
84906K/L
Attenuator setting 10 20 30 40 50 60 70 80 90 Frequency range dc to 40 GHz
2
0.5 0.6 0.7 1.0 1.2 1.6 1.8 2.7 2.9
84904K/L
Attenuator setting (dB) 1234567891011 Frequency range
dc to 18 GHz 0.35 0.45 0.55 0.55 0.55 0.55 0.60 0.60 0.65 0.70 0.80 18 to 26.5 GHz 0.40 0.50 0.70 0.70 0.70 0.70 0.80 0.80 0.85 0.90 1.10
26.5 to 40 GHz
2
0.60 0.60 0.80 0.80 0.80 0.90 1.10 1.10 1.20 1.30 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 combina-
tion 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.
6
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 Connector dc to 12.4 GHz 34 GHz to SWR Connector dc to 12.4 GHz
Option 12.4 GHz to 34 GHz 40 GHz Option 12.4 GHz to 26.5 GHz
L models K models
84904L with 101 1.3 1.7 1.8 84904K 004 1.3 1.7 84904L with 006 1.5 1.9 2.0 84904K 104 1.3 1.7 84904L with 100 1.3 1.7 1.8 84906K 004 1.3 1.7 84904L with 106 1.5 1.9 2.0 84906K 104 1.3 1.7 84906L with 101 1.3 1.7 1.8 84907K 004 1.25 1.5 84906L with 006 1.5 1.9 2.0 84907K 004 1.25 1.5 84906L with 100 1.3 1.7 1.8 84906L with 106 1.5 1.9 2.0 84907L with 101 1.25 1.5 1.7 84907L with 006 1.4 1.7 1.9 84907L with 100 1.25 1.5 1.7 84907L with 106 1.4 1.7 1.9
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 µs max. pulse width)
Life (min.)
5 million cycles per section
Repeatibility
0.03 dB, typical
Environmental capabilities
(Up to 5 million cycles)
Temperature, operating
–20°C to +75°C
Temperature, non-operating
–55°C to +85°C
Altitude, operating
4,570 meters (15,000 ft.)
Altitude, non-operating
13,700 meters (50,000 ft.)
Humidity
Cycling 5 days, 40°C 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
7
Mechanical information
Net weight 84904K/L 84906K/L 84907K/L
291 grams 291 grams 229 grams
(10.3 oz) (10.3 oz) (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 Nominal coil
Solenoids Coil voltage Current
1
impedance
Option 024 24 V 125 mA
(20 to 30 V) (at 24 V) 190
Option 015 15 V 188 mA
(13 to 22 V) (at 15 V) 80
Option 011 5 V 325 mA
(4.5 to 7 V) (at 5 V) 17
1 Current per section; approximately 10 msec duration before internal contacts open the coil circuit
Figure 5. Dimensions are in millimeters and inches.
94
(3.7)
73.3
(2.89)
41.8
(1.65)
*6.6
(.26)
10.4 (.41)
41.5
(1.63)
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
84904,6K/L 84907K/L
Mounting holes 4X M3X0.5X6 deep Ø 2.6 thru
104.3 (4.11)
2.4 mm Connector STD or:
2.92 mm Connectors (SMA Compatible) Option 006
5.8
(.23) 13.5
41.8
(1.65)
*6.6
(.26)
10.4 (.41)
41.5
(1.63)
74.5 (2.9)
53.8 (2.1)
Mounting holes 4X M3X0.5X6 deep Ø 2.6 thru
84.7
2.4 mm Connector STD or:
2.92 mm Connectors (SMA Compatible) Option 006
5.8
(.23) 13.5
22.2 (.87)
7.8
11.1 (.44)
11.5
22.5
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
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 11713A)
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