DATA SHEET
DDC, CDC, SMS Series: Zero Bias Silicon Schottky Barrier
Detector Diodes
Applications
Microwave Integrated Circuits
Detectors
Features
High sensitivity
Low video impedance
Packages rated MSL1, 260 C per JEDEC J-STD-020)
Skyworks offers lead (Pb)-free, RoHS (Restriction of
Hazardous Substances) compliant packaging.
TSS is a parameter that best describes the use of a diode as a video
detector. It is defined as the amount of signal power, below a one
milliwatt reference level, required to produce an output pulse with
an amplitude sufficient to raise noise fluctuations by an amount
equal to the average noise level. TSS is approximately 4 dB above
the minimum detectable signal.
Voltage output is another useful parameter since it can be used in
the design of threshold detectors and power monitor circuits. Since
voltage output is a function of the diode’s video impedance, a
different minimum value is specified for each video impedance
range.
The absolute maximum ratings for the DDC, CDC, and SMS series
of Schottky diodes is provided in Table 1. Electrical and physical
specifications are provided in Table 2. Package types for the
epoxy and hermetic diodes are listed in Table 3.
Typical performance characteristics are shown in Figures 1
through 8. Typical video detector circuits are shown in Figure 9.
The multi-octave, high-sensitivity circuit would be used in Electronic
Countermeasures (ECM) and similar applications. An RF matching
structure that presents maximum power at the diode junction must
be incorporated to ensure maximum sensitivity.
The broadband low-sensitivity circuit would be used where a low
input VSWR is required. In this circuit, low VSWR is accomplished by
the use of the 50
Ω
terminating resistor. Sensitivity, however, is
degraded by typically 10 dB from the multi-octave, high-sensitivity
circuit. The most common use for this circuit is in a broadband, flat
detector used primarily in the laboratory.
Description
Skyworks packaged, beam-lead and zero-bias Schottky barrier
detector diodes are designed for applications through the K band.
The choice of barrier metal and process techniques results in a
group of diodes with a wide selection of video impedance ranges.
Packaged diodes are suitable for use in waveguide, coaxial, and
stripline applications. Beam-lead and chip diodes can also be
mounted in a variety of packages.
The DDC, CDC, and SMS series of Schottky diodes are especially
well suited for use in Microwave Integrated Circuit (MIC)
applications where the chip and wire approach is more desirable.
Mounted beam-lead diodes can be easily used in MIC, stripline, or
other such circuitry.
Applications
The DDC, CDC, and SMS series of zero-bias Schottky diodes are
designed for detector applications through 26 GHz and are useful
up to 40 GHz. They require no bias and operate efficiently even at
tangential signal power levels. Since they require no bias, noise is at
a minimum. A low video impedance means a short R-C time
constant and, therefore, wide video bandwidth and excellent pulse
fidelity.
As power monitors, these diodes may also be used to directly drive
metering circuits even at low power input levels. These diodes are
categorized by Tangential Signal Sensitivity (TSS), voltage output,
and video impedance for detector applications.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
200843B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • October 7, 2009
1
DATA SHEET • DDC, CDC, SMS SERIES: ZERO BIAS SCHOTTKY DIODES
Table 1. DDC, CDC, SMS Diode Series Absolute Maximum Ratings
Parameter
Reverse voltage
Forward current
RF input power @ T
A
= 25
°C
Storage temperature
Operating temperature
Note:
Symbol
V
R
I
F
P
D
T
STG
T
A
Minimum
Maximum
2
100
75
Units
V
mA
mW
C
C
–60
–55
+200
+150
Exposure to maximum rating conditions for extended periods may reduce device reliability. There is no damage to device with only one parameter set at the limit and all other
parameters set at or below their nominal value. Exceeding any of the limits listed here may result in permanent damage to the device.
CAUTION:
Although this device is designed to be as robust as possible, Electrostatic Discharge (ESD) can damage this device. This device
must be protected at all times from ESD. Static charges may easily produce potentials of several kilovolts on the human body
or equipment, which can discharge without detection. Industry-standard ESD precautions should be used at all times. The
DDC, CDC, SMS series of Schottky diodes are Class 0 Human Body Model (HBM) ESD devices.
Table 2. DDC, CDC, SMS Diode Series Electrical Specifications (Note 1)
(T
A
= +25 C, Characteristic Impedance [Z
O
] = 50
Ω,
Unless Otherwise Noted)
Part Number
DDC2353-000
DDC2354-000
CDC7630-000
CDC7631-000
Min. Detected Output
Voltage, EO
(mV)
8
15
8
15
Video Impedance, Z
V
(Ω)
2000 to 5000
5000 to 15000
2000 to 5000
5000 to 15000
Max. TSS
(dBm)
–52
–56
–52
–56
Outline
Drawing
491-006
491-006
571-006
571-006
Note 1:
Performance is guaranteed only under the conditions listed in this Table and is not guaranteed over the full operating or storage temperature ranges. Operation at elevated
temperatures may reduce reliability of the device.
Table 3. Epoxy and Hermetic Packaged Zero Bias Schottky Detector Diodes
Part Numbers/Outline Drawings
Epoxy Stripline
250
DDC2353-250
DDC2354-250
Hermetic Pill
207
CDC7630-207
CDC7631-207
Hermetic Pill
203
CDC7630-203
CDC7631-203
Hermetic
109
SMS7630-109
SMS7619-109
Hermetic
220
DDC2353-220
DDC2354-220
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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October 7, 2009 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200843B
DATA SHEET • DDC, CDC, SMS SERIES: ZERO BIAS SCHOTTKY DIODES
Typical Performance Characteristics
+60
Tangential Signal Sensitivity (dBm)
10.0000
1.0000
0.1000
0.0100
0.0010
0.0001
0
5
10
15
20
25
30
35
40
High Video Impedance Types
Low Video Impedance Types
+58
+56
+54
Test Condition:
Video Bandwidth = 10 MHz
Forward Current (mA)
+52
+50
100
1000
10000
100000
Forward Voltage (mV)
Video Impedance (Ω)
Figure 2. Typical Zero Bias X-Band Detector Diodes
TSS vs Video Impedance
Figure 1. Zero BIas Schottky Detector Diodes
Typical Forward DC Characteristics
800
10000.00
100 kΩ
Output Voltage (mV)
1000.00
700
600
500
400
1 kΩ
50 kΩ
Output Voltage (mV)
10 kΩ
100.00
Z
V
= 10 k
Ω
10.00
Z
V
= 1 k
Ω
1.00
Z
V
= 400 k
Ω
0.10
0.01
–50
Test Conditions:
f = 9.375 GHz
Load Resistance = 10 MΩ
–40
–30
–20
–10
0
+10
+20
300
–40 –25 –10
+5 +20 +35 +50 +65 +80 +95
Input Power (dBm)
Temperature (°C)
Figure 4. Output Voltage vs Temperature
Over Load Resistance @ 0 dBm
Figure 3. Typical Zero Bias X-Band Detector Diodes
Output Voltage vs Input Power as a Function of Video Impedance
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
200843B • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • October 7, 2009
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