ATTENUATORS, PIN DIODE
“PHASE-FREE 0.25–18 GHz
”
GENERAL INFORMATION:
KDI/Triangle’s phase free Pin diode attenuators change the amplitude of
a microwave signal with matched (low) VSWR over the full attenuation
range, and with minimum phase shift change. The units are supplied with
either an analog or with a digital control input, with a dynamic attenuation
range of 32 dB minimum. Standard digital units are supplied with 8 TTL
logic inputs (bits) and therefore can produce 256 discrete values of atten-
uation. Units with 10 or 12 bits can be provided as specials.
SERIES DF & FF
GENERAL SPECIFICATIONS:
Frequenc y Rang e:
RF Impedance:
D.C. Volta ge:
Logic (DF Series)
:
No. of Bits:
Attentuation:
Contr ol Rang e: (FF Series)
Contr ol Input Impedance
Accura y/Frequen y Flatnes
c
c
s
0.25 to 18.0 GHz
50 OHMS
± 15 volts at ± 50 mA
TTL compatible
8 L.S.B. = 0.125 dB.
31.875 dB
0-10 volts produces 0-32 dB. Other control
voltages can be provided on request.
10 K Ohms, 20 pf
For octave models, the frequency sensi-
tivity including digital settability is typically ±
0.8 dB to 20 dB; ± 1.25 dB to 32 dB over
the frequency range. Narrow band units are
proportionally more accurate.
100 mW CW 60 watts peak operational.
Units will not be damaged by application of
1 watt CW 100 watts peak.
Operating temperature from -55°C to +85°C
A) Standard: ±0.3 dB from + 10°C to +40°C
B) ± 0.5 dB to 20 dB and ±0.75 dB to 32 dB
can be provided from -54°C to +85°C. If this
stability is desired, add a suffix TT to model
number.for example, if the DF-74 is desired
with temperature compensation, it is
ordered as DF-74-TT.
SMA standard. A mating multipin connector
can be supplied with each unit upon request.
ITT Cannon MDB-1-15SSL or equivilent.
Response time of all models is 10
microsec. Faster models (to 150
nanosec.) can be quoted on request.
Any of the models “FF” can be supplied
with a linearizer by adding a prefix 2. For
example, if the FF-47 is desired with a
linearizer, it is ordered as a 2-FF-47.The
overall accuracy including linearity and
frequency sensitivity is then ±0.75 dB to
20 dB and ±1.25 dB to 32 dB.
C
in[mm]
3.600[91,4]
2.600[66,04]
3.600[91,4]
4.100[104,14]
3.100[78,74]
4.100[104,14]
D
in[mm]
3.375[85,72]
1.375[34,92]
3.375[85,72]
3.375[85,72]
1.375[34,92]
1.375[34,92]
E
in[mm]
0.38[9,65]
0.35[8,9]
0.45[11,4]
0.31[7,87]
0.40[10,2]
0.45[11,4]
F
in[mm]
0.25[6,4]
0.25[6,4]
0.31[7,87]
0.28[7,11]
0.25[6,4]
Notes:
1. Harmonic Distortion: Approximately –50 dBc for Pin
≤
0 dBm at a frequen-
cy of 1.0 GHz for most units. This value improves by approximately 10 dB
per octave as the frequency increases; however, since this value is depen-
dent on bandwidth of the unit, power input, and switching speed required,
the factory should be consulted if harmonic content is an important system
requirement.
2. The phase shift over the center half of the frequency range is 1/2 of the
value listed, e.g.: the phase shift of the FF-47 is ±5° from 2.5 to 3.5 GHz
(0–20 dB). See Fig. 2
3. Other configurations (up to 12 Bits) or units with different attenuation
values can be quoted on request.
.32
[8,2]
TYP
RF Power:
Temperature In ormation:
f
Temperature Stability:
.38
[9,7]
TYP
RF
A/2
F
PIN #1
REF
POWER/LOGIC
Connecto s:
r
B
D
RF
Switc hing Speed:
E
C
A
.125/[3,20] DIA THRU
3 MTG HOLES
.20
.10
[5,0]
[2,5]
Linearization:
.56
[14,2]
ITT CANNON
MDB1-15PSP
OR EQUIV.
DIGITAL MODELS (DF SERIES)
G
in[mm]
0.32[8,12]
0.34[8,6]
—
—
—
Out-
Line
1
2
3
4
5
6
A
in[mm]
4.00[101,6]
3.00[76,2]
4.00[101,6]
4.50[114,3]
3.50[88,9]
4.50[114,3]
B
in[mm]
4.00[10,1]
2.00[50,8]
2.00[50,8]
4.00[101,6]
2.00[50,8]
2.00[50,8]
POWER LOGIC PIN CONNECTIONS
PIN
1-12
13
14
15
FUNCTION
Logic inputs
+15 VDC
-15 VDC
GND
0.39[9,90] 0.32[8,12]
KEY:
Inches[Millimeters] .XX ±.03 .XXX ±.010 [.X ±0.8 .XX ±0.25]
60 South Jefferson Road, Whippany, NJ 07981
Tel: 973-887-8100 • Fax: 973-884-0445
email: sales@aeroflex-kdi.com
See us on the web @ www.aeroflex-kdi.com
8-10-07
ATTENUATORS, PIN DIODE
“PHASE-FREE 0.25–18 GHz
”
SPECIFICATIONS
DF Series
SERIES DF & FF
VSWR
For All
Values of
Atten.
Maximum
1.5
1.5
1.5
1.5
1.5
1.75
1.8
2.2
Digital
Model*
No.
FF-18
FF-32
FF-36
FF-45
FF-47
FF-62
FF-73
FF-74
Analog
Model
No.
DF-18
DF-32
DF-36
DF-45
DF-47
DF-62
DF-73
DF-74
Frequency
Range
GHz
0.25–0.5
0.95–1.25
1.0–2.0
1.7–2.4
2.0–4.0
4.0–8.0
7.0–12.4
8.0–18.0
FF
Outline
1
1
3
3
3
2
2
2
DF
Outline
4
4
6
6
6
5
5
5
Least
Significant
Bit dB
Note 3
.125
.125
.125
.125
.125
.125
.125
.125
Insertion
Atten.
Loss
Range
Maximum
Maximum dB
dB
32
4.5
32
32
32
32
32
32
32
3.0
4.0
3.5
3.0
3.75
4.25
5.5
Maximum Phase
Shift
± Deg.
0–20 dB
20–32 dB
10
15
5
10
6
10
12
12
15
7.5
15
10
15
15
15
20
* Add Prefix “2” for Linearization
Add Suffix “TT” for Temp Comp; -55 to +85 c
G
F
RF
GND
-15V
+15V
CON-
TROL
B
.56[14,22]
0.38
[09,7]
TYP.
A/2
0.125[3,18] DIA THRU
3 MTG. HOLES
NOTE:EITHER
RF CONNECTOR
MAY BE USED
FOR INPUT
TYPICAL CURVE OF ATTENUATION
VS CONTROL VOLTAGE
FIG. 1
32
30
NON
LINEARIZED
25
SMA
FEMALE
TYP.
0.5 dB
D
20
E
0.10[2,5]
C
A
0.20[5,1]
ATTENUATION
(dB)
LINEARIZED
15
BEST FIT
STRAIGHT
LINE
ANALOG MODELS (FF SERIES)
10
5
TRANSMISSION PHASE
(DEGREES)
+15
+12
+9
+6
+3
0
-3
-6
-9
-12
-15
Fmin
TYPICAL CURVE OF FF-18 OR DF-18
AT MAX. ATTENUATION (32 dB)
TYPICAL CURVE OF FF-45 OR DF-45
AT MAX. ATTENUATION (32 dB)
TYPICAL CURVE OF FF-18 OR DF-18
AT 20 dB ATTENUATION
TYPICAL CURVE OF FF-45 OR DF-45
AT 20 dB ATTENUATION
REF. PHASE AT ZERO ATTENUATION
FOR FF-18 OR DF-18 AND FF-45 OR DF-45
F0
FREQUENCY
Fmax
0
0
2
5
8
CONTROL VOLTAGE
(V)
10
PHASE SHIFT VS FREQUENCY
AT VARIOUS ATTENUATION LEVELS
KEY:
Inches[Millimeters] .XX ±.03 .XXX ±.010 [.X ±0.8 .XX ±0.25]
60 South Jefferson Road, Whippany, NJ 07981
Tel: 973-887-8100 • Fax: 973-884-0445
email: sales@aeroflex-kdi.com
See us on the web @ www.aeroflex-kdi.com
8-10-07
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