Maxi-Pole Notch Series

MAXI-POLE® Notch Filters offer all of the same performance features as the MINI-POLE® Notch filters, with the advantage of an improved notch shape factor.


Frequency Coverage (5 bands): 1.5 MHz to 400 MHz
Input/Output Impedance: 50 Ω
Inband RF Power Handling: 1 Watt (input)
Passband Third Order Intercept Point: +50 dBm (input,f0 > 30 MHz)
Passband Insertion Loss: 1 dB (max)
Passband VSWR: 2:1 (max)
Tuning Control: 8 bit parallel
Tuning Speed: 10 µ S (f0 > 30 MHz,
+10 dBm reference)
DC Power: +5 VDC @ 10 to 500 mA +100 VDC @ 1mA
Operating Temperature Range: -40 to + 85°C
Center Frequency Drift: 80 PPM/°C

The following plots illustrate approximate performance (not representative of all frequency ranges):



Frequency (MHz)


Notch Depth (dB)





10 – 30
















1.5 – 4









4 – 10









10 – 30









30 – 90









90 – 200









200 – 400









225 – 400





Available Options:

A. Internal DC-DC Converter (Eliminates need for high voltage supply. Requires additional 250 mA of 5 VDC current)
B. Serial Interface
C. Custom Frequency Bands (Specify START and STOP frequencies in MHz)
F. Filtered D-Connector


1) Options may be limited to particular frequency. Consult factory for your application.
2) Filters are aligned and tested using a High Bias of +100 VDC unless otherwise specified by the customer.


Frequency Tuning Address

Maxi-Pole Series filters utilize an eight-bit scheme for tune words to digitally control tuning of the center frequency. For further information on how to calculate tune words, please see the Frequency Tuning Address Application Note.

Bias Voltage Requirement

A bias voltage is required to reverse bias the PIN diodes used to tune the filter. Very little static current (less than 1 mA) is needed. A minimum of 30 Volts is recommended for proper filter operation, although is some instances voltages as low as 12 Volts will provide acceptable performance. As this voltage is increased, the power handling capability and intermodulation are improved as shown below. A bias voltage of +100 VDC is recommended for best results, and all filters are tuned and aligned this way from the factory unless otherwise specified by the customer. An internal low EMI supply, powered from the +5 VDC input, is available as an option.
Interface Options

The filter comes standard with an 8-bit parallel interface, although a serial interface can be specified as an option.

DC Control Interface Characteristics

Symbol  Parameter  Condition  Min  Max  Units 
VIL  Input Low Voltage  Control Signals except A0 – A7  0.0  0.2 Vcc 
VIH  Input High Voltage   Control Signals except A0 – A7   0.7Vcc  Vcc 
VIL1  Input Low Voltage   A0 – A7  0.0  0.15Vcc 
VIH1  Input High Voltage   A0 – A7  0.7Vcc  Vcc 


Switching Characteristics

Vcc = +5VDC, ± 10%; T= -40 to +85°C







Setup Time, A0-A7 to STB





Hold Time, A0-A7 from STB





STB High Time





STB Pulse Width





Strobe D well Time (From STB Falling edge to next STB Falling edge)





Access time from STB to f0




The filter is tuned within 15 µS to the frequency designated by the tuneword existing on the eight control bit lines when theline is brought low. Once strobed, data existing on the tune control lines is ignored until strobed again. Maximum strobe rate for frequencies above 10 MHz is 2 kHz, and below 10 MHz is typically 1 kHz.

RF Power Handling Capability

The filters are designed to operate with RF input power levels up to 1 Watt (+30 dBm) inband (see curves above under Bias Voltage Requirement). Signals in the filter passband up to 5 Watts at the input will not cause damage to the filter.

Temperature Effects

Over the –40 to +85°C temperature range, filters will exhibit a temperature drift of less than 80 PPM/°C, or a total of less than ±0.5% of the center frequency.

Parallel Interface

PIN#  REF DES  Description  Max Ratings 
A2  Tune Bit 2  +6 VDC 
A3  Tune Bit 3 
A4  Tune Bit 4 
A5  Tune Bit 5 
A6  Tune Bit 6 
A7  Tune Bit 7 (MSB) 
GND  Ground   
Vcc  +5 VCD, +-10%  +6 VDC 
GND  Ground   
10  Vbb  High Bias  +125 VDC 
11  GND  Ground   
12  GND  Ground   
13  STB  Strobe  +6 VDC 
14  A0  Tune Bit 0 (LSB) 
15  A1  Tune Bit 1 




Serial Interface




PIN#  REF DES  Description  Max Ratings 
DO  Serial Data Out +6 VDC 
No Connect
No Connect
No Connect
No Connect
No Connect
GND  Ground   
Vcc  +5 VCD, +-10%  +6 VDC 
GND  Ground   
10  Vbb  High Bias  +125 VDC 
11  GND  Ground   
12  GND  Ground   
13  STB  Strobe  +6 VDC 
14  SER CLK  Serial Clock
15  D1 Serial Data In




Data is believed to be accurate. All data is subject to change without notice.




Contact Sales

The Pole/Zero Sales and Marketing team is a highly qualified group of engineers who can relate to your design problems and provide expert assistance. They make sure you get the right components at the right time and price.

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.