ERF-5W™ Series (Single & Dual)

The new ERF-5W™ filter takes Pole/Zero’s MINI-ERF® technology to a higher level of RF power handling, with 5W (average) in-band power handling, and covering the entire military tactical radio tuning range of 30-520 MHz in one integrated package. This tunability is accomplished by the use of three poles of selectivity, multiple internal tunable filters along with high performance PIN diode RF band select switches. The tunable filters are designed to minimize size and power consumption, while maintaining high RF power handling and linearity characteristics. Serial control is accomplished via a standard Serial Peripheral Interface (SPI)-based bus.


Frequency Coverage (12 bands): 30 MHz to 520 MHz
Input/Output Impedance: 50 Ω
Inband Input/Output VSWR: 1.65:1 max
Insertion Loss: 2.5dB +/- 1 dB typ
Percent Bandwidth: 10% typ
Selectivity @ Fe +/- 20%: 35dB typical
Inband RF Power Handling: 5 watts (input) avg
Out of Band RF Power Handling: Up to 10 watts (input)
Inband Third Order Intercept Point:
+47 dBm (input)
Tuning Control:
Parallel or Serial
Tuning Speed: 25 μsec typical, 50 μsec max
DC Power: = +5 VDC @ 1.5A max
Operating Temperature Range: = -40 to +85°C



Note 1:

Out of band RF power handling refers to signals thatare at least twenty percent (20%) removed from the tuned center frequency andis frequency dependent: 5W signals applied between 30 and 75 MHz, 8W from 75 to 175 MHz, and 10 W from 175 to 520 MHz


The following plot(s) illustrate approximate performance:

General Information
The 5W-ERF requires a single +5vdc analog supply and a +1.65 to +5.5vdc digital supply. These supply voltages should be adequately filtered as noise present on these pins will influence the RF signal purity.

Notes: 1. First number indicates maximum inband power levels and second number indicates maximum out of band RF power levels either in CW or composite peak for multi-tones.

Digital Interface Information

With the “PAR/NSER” input low, the unit is in serial control mode. When it is high, the filter is in parallel control mode. Maximum input data rate is 7Mhz. In either mode, 2 bytes of data are required. One selects the internal frequency band and the other selects the tuneword (251 tune frequencies within each band). All data input pins are CMOS/TTL compliant. Logic high/low levels are as follows:

Symbol Parameter VCCD Minimum Maximum Unit
VIH High-level input voltage 1.65Vto 1.95V VCCD x 0.65 VCCD V
2.3 V to 2.7 V 1.7
3 V to 3.6 V 2
4.5 V to 5.5 V VCCD x 0.7
VIL Low-level input voltage 1.65 V to 1.95 V   VCCD x 0.35 V
    2.3 V to 2.7 V   0.7  
    3 V to 3.6 V   0.8  
    4.5 V to 5.5 V   VCCI x 0.3  
PIN# REF DES Description Max Ratings
1-6 NC ———————–
7 GND Ground
8 NC
9 GND Ground
10 SEL_BAND_1 Band Select Pin (MSb) VCCD – 0.2VDC
 11     ———————–
12 GND Ground
13 A7/Serial Clock IN Tune Bit 7/ Serial Clock IN VCCD – 0.2VDC
14 A5/MOSI Tune Bit 5/ Serial Data IN
15 A3 Tune Bit 3
16 A1 Tune Bit 1
17 Tune Ready Output Tune Ready Output
18 VCCD Digital Interface Supply 1.6 to 5.5 VDC interface
voltage (0.1 MA MAX).
For 3.3V Interface use
19 VCCA +5VDC +5.5V (1.5A max.)
20-23 NC   —————– 
24-25 GND  Ground 
26 NC    —————– 
27 GND  Ground  —————–
28 SEL_BAND_0 Band Select Pin (LSb)  VCCD – 0.2VDC
 29  NC   —————–
30 STBn  nStrobe  VCCD – 0.2VDC
31 A6  Tune Bit 6 
32 A4/CS_LD  Tune Bit 4/SPI Chip Select/Load Data
33 A2  Tune Bit 2 
34 A0  Tune Bit 0 (LSB) 
 35 PAR/NSER  Parallel/Serial Mode Control
 36 VCCD  Digital Interface Supply See PIN 18 Comments
37 VCCA +5 VDC +5.5 VDC (1.5A max.)



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Feel free to call upon our sales team (513) 870-9060 at any time. They are here to assist you and are happy to do so.