HIGH-PERFORMANCE WIDE BANDWIDTH AND WIDE
DEVIATION FM DEMODULATOR MODULE
IFDMLIM SERIES
The IFDMLIM series FM demodulators have excellent IF-to-
baseband characteristics in their respective operating bands.
These demodulators receive FM modulated carriers at different
center frequencies and recover the baseband information with
high fidelity. The application of these demodulators are in satel-
lite communications and test equipment.
FEATURES
• Excellent IF-to-baseband characteristics
• Excellent baseband frequency response
• Wide deviations
MODEL
NUMBER *
PEAK-TO-PEAK
DEVIATION
(MHz)
LINEARITY
(±%)
LINEAR
GROUP DELAY
(ns/MHz)
PARABOLIC
GROUP DELAY
(ns/MHz
2
)
TOTAL
GROUP DELAY
(ns)
21.4 MHz FM DEMODULATORS
IFDMLIM-21.4-6-1.5-I/O
IFDMLIM-21.4-8-2.0-I/O
IFDMLIM-21.4-10-2.5-I/O
6
8
10
1.5
2
2.5
-
-
-
-
-
-
4
5
5
30 MHz FM DEMODULATORS
IFDMLIM-30-8-1.2-I/O
IFDMLIM-30-10-1.5-I/O
IFDMLIM-30-15-2.0-I/O
8
10
15
1.2
1.5
2
-
-
-
-
-
-
4
4.5
5
70 MHz FM DEMODULATORS
IFDMLIM-70-10-0.5-I/O
IFDMLIM-70-20-0.75-I/O
IFDMLIM-70-30-1.5-I/O
IFDMLIM-70-30-1.0-I/O
IFDMLIM-70-36-1.25-I/O
IFDMLIM-70-36-1.0-I/O
IFDMLIM-70-40-1.25-I/O
10
20
30
30
36
36
40
0.5
0.75
1.5
1
1.25
1
1.25
0.04
0.05
0.03
0.025
0.03
0.03
0.04
0.01
0.04
0.007
0.006
0.006
0.006
0.006
-
-
-
-
-
-
-
140 MHz FM DEMODULATORS
IFDMLIM-140-20-0.75-I/O
IFDMLIM-140-30-0.75-I/O
IFDMLIM-140-36-1.25-I/O
IFDMLIM-140-40-1.25-I/O
IFDMLIM-140-50-1.5-I/O
20
30
36
40
50
0.75
0.75
1.25
1.25
1.5
0.05
0.025
0.03
0.04
0.04
0.04
0.006
0.006
0.006
0.006
-
-
-
-
-
160 MHz FM DEMODULATORS
IFDMLIM-160-20-0.75-I/O
IFDMLIM-160-30-0.75-I/O
IFDMLIM-160-36-1.25-I/O
IFDMLIM-160-40-1.25-I/O
IFDMLIM-160-50-1.5-I/O
IFDMLIM-160-60-1.8-I/O
20
30
36
40
50
60
0.75
0.75
1.25
1.25
1.5
1.8
0.05
0.025
0.03
0.04
0.04
0.04
0.04
0.006
0.006
0.006
0.006
0.006
-
-
-
-
-
-
* I = Input impedance; O = Output impedance.
For impedance of 75 ohms, I or O = 7; for impedance of 50 ohms, I or O = 5.
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COMMON ELECTRICAL SPECIFICATIONS
50 or 75 ohms
20 dB minimum
-5 to +8 dBm (see Options)
10 Hz to 6 MHz, ±0.25 dB maximum
10 Hz to 10 MHz, ±0.5 dB maximum
Demodulation sensitivity ...................................... 40 mV/MHz nominal (see Options)
Output impedance ............................................... 50 or 75 ohms
Output return loss ................................................ 26 dBm minimum to 10 MHz
PRIMARY POWER REQUIREMENTS
Current/voltage .................................................... 250 mA @ +15 volts
60 mA @ -15 volts
Input impedance ..................................................
Input return loss ..................................................
Input level ............................................................
Baseband output frequency response.................
MECHANICAL SPECIFICATIONS
PHYSICAL
Dimensions .......................................................... 6.6” x 2.9” x .75”
CONNECTORS
Input/output.......................................................... SMA female
DC power, housing ground .................................. 9-pin male, D type
OPTIONS
IFDM1
IFDM2
IFDM3
IFDM4
Demodulation sensitivity (customer to specify).
IF input level (customer to specify).
IF baseband level adjust (customer to specify).
IF input center frequency (customer to specify).
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