Model XDL21-7-125
Rev D
Delay Line
DESCRIPTION
The XDL21-7-125 is a surface mount delay line that uses a slow wave
coupling structure that maximizes the amount of delay per unit area over
other distributed delay structures. The XDL21-7-125 can be used in
amplifier linearization applications from 2110 – 2170MHz. The XDL21-7-
125 is ideal for use in the main loop of feed forward and in pre-distortion
amplifiers. The Xinger® delay lines are a low cost, high quality alternative to
the traditional coaxial and filter solutions presently available. Parts have
been subjected to rigorous qualification testing and units are 100% tested.
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ELECTRICAL SPECIFICATIONS
Features:
•
•
•
•
•
•
•
•
Frequency
(MHz.)
Mean Delay
(nS)
Deviation from Linear Phase
(Degrees Max)
Amplitude Flatness
(dB p-p)
Return Loss
(dB min)
Insertion Loss
(dB/nS)
Insertion Phase
(Degrees)
Power Handling
(Watts)
ΘJC
(°C/watts)
Operating Temp.
(°C)
2110 – 2170
UMTS Band
12.5±0.25
±1.0
0.15
20
0.55
110±30
1
5
Production Friendly
Consistent Delay
Stable Over
Temperature
Surface Mountable
Available in Tape &
Reel
Non-Lead Solder Paste
Compatible
100% Tested
Lead Free
-55 to +85
Specification based on performance of unit properly installed on microstrip printed circuit boards with 50
Ω
nominal
impedance. Specifications subject to change without notice.
Mechanical Drawing
Top View (Near-side)
Side View
.134
±.015
[3.39
±0.38
]
Hot
Via
Bottom View (Far-side)
Hot
Via
.773
±.004
[19.64
±0.10
]
Hot
Via
1.000
±.010
[25.40
±0.25
]
2X .062
±.004
[1.58
±0.10
]
GND
1.000
±.010
[25.40
±0.25
]
GND
.774
±.004
[19.65
±0.10
]
2X R.116
Orientation
Marker Denotes
Pin Location
Denotes
Array Number
2X .037
±.004
[0.94
±0.10
]
Pin 2
.848
±.004
[21.54
±0.10
]
2X .070
±.004
SQ
[1.78
±0.10
]
Pin 1
Dimensions are in Inches [Millimeters]
XDL21-7-125 Mechanical Outline
Tolerances are Non-Cumulative
Available on Tape
and Reel For Pick and
Place Manufacturing.
USA/Canada:
Toll Free:
Europe
:
(315) 432-8909
(800) 544-2414
+44 2392-232392
Model XDL21-7-125
Rev D
TYPICAL PERFORMANCE: 500 MHz. To 2500 MHz.
AVERAGE DELAY
The average delay is defined as the group delay of the input signal through the delay line. The lot-to-lot variation is
reflected in the plus/minus tolerance given in specifications.
Refer to Anaren Application Note AAN-232 for further information on Xinger delay lines.
MOUNTING GUIDELINES:
To insure proper electrical and thermal performance
there must be a ground plane with 100%
solder connection underneath the part
In order for Xinger surface mount delay lines to work
optimally, there must be 50Ω transmission lines leading to
and from all of the RF ports. Also, there must be a very
good ground plane under the part with a number of plated
thru holes to ensure proper electrical performance. If any
of these conditions are not satisfied, insertion loss,
average delay and VSWR may not meet published
specifications.
When a surface mount delay line is mounted to a printed
circuit board (PCB), the primary concerns are; insuring
the RF pads of the device are in contact with the circuit
trace of the PCB and the ground plane of neither the
component nor the PCB are in contact with the RF signal.
An example of how the PCB footprint could look is shown
below. In particular designs, the 50Ω lines need to be
adjusted to the unique dielectric coefficients and
thicknesses as well as varying pick and place equipment
tolerances.
2X .037
[0.94]
.889
[22.58]
Multiple
plated thru holes
to ground
.869
[22.06]
2X Ø.116
[2.95]
2X .076 SQ
[1.93]
.848
[21.54]
2X 50
Transmission
2X .037
[0.94] Line
Dimensions are in Inches [Millimeters]
XDL21-7-125 Mounting Footprint
USA/Canada:
Toll Free:
Europe:
(315) 432-8909
(800) 544-2414
+44 2392-232392
Available on Tape and
Reel For Pick and Place
Manufacturing.
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