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MAXI-POLE® Series

The MAXI-POLE® Series of tunable filters provides improved passband performance (reduced insertion loss for a given bandwidth) in a slightly larger package. The product line includes several standard designs in various frequencies to support almost any application. Approximate performance is summarized in the Maxi-Pole Series Selection Guide.
  • Specifications
  • Performance
  • Selection Guide
  • Numbering Table
  • Interface and Control Options
  • Package Outline
  • Pinout and Ratings
Frequency Coverage (8 bands): 1.5 MHz to 1 GHz
Input/Output Impedance: 50 Ω
Inband RF Power Handling: 1 Watt (input)
Inband Third Order Intercept Point: +40 dBm (input)
Inband Second Order Intercept Point: +100 dBm (input)
Tuning Control: 8 bit parallel
Tuning Speed: 10 µ S (f0 > 30 MHz)
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)

  
  
The following plots illustrate approximate insertion loss and bandwidth trends across a given frequency band, and the differences between various bands:

MAXI-10-30-5


MAXI-30-90-2


MAXI-90-200-4


MAXI-400-700-5



The Selection Guide illustrates approximate performance; table values are shown as average/maximum.

Frequency Range
Suffix
Insertion Loss
% Bandwidth (3dB)
Shape Factor (30 dB / 3 dB)
Ultimate
(2 x fo)
Overall Low Side High Side
1.5 to 4
MHz
-1
 
 
 
 
 
 
-2
1.8/2.3
5.3/5.5
5.8/6.1
6.8/7.3
4.8/4.9
 
-3
 
 
 
 
 
 
-4
 
 
 
 
 
 
-5
 
 
 
 
 
 
4 to 10
MHz
-1
 
 
 
 
 
 
-2
1.8/2.3 
5.3/5.5
6.0/6.2
7.0/7.2
5.0/5.1
 
-3
2.2/3.5
3.4/3.8
5.9/6.2
7.1/7.6
4.8/5.0
 
-4
 
 
 
 
 
 
-5
3.8/6.3
1.9/2.2
6.1/6.2
6.9/7.0
5.3/5.4
 
10 to 30
MHz
-1
 
 
 
 
 
 
-2
1.4/2.3
5.1/5.5
6.1/6.3
7.0/7.4
5.1/5.2
 
-3
2.0/3.5
3.6/3.8
6.1/6.5
7.3/8.0
4.9/5.2
 
-4
3.5/4.5
2.4/2.8
5.9/6.0
6.6/6.7
5.2/5.4
 
-5
4.3/6.3
2.0/2.2
5.8/6.1
6.6/7.2
5.0/6.1
 
30 to 90
MHz
-1
 
-2
1.6/3.0
4.8/5.5
6.7/7.7
9.2/11.3
4.2/4.6
-3
2.4/3.5
3.5/3.9
5.9/6.3
6.6/7.6
5.2/6.0
-4
3.5/4.5
2.6/2.8
5.8/5.9
6.8/7.1
4.8/4.9
 
-5
4.3/5.8
2.0/2.2
5.5/6.3
6.3/7.3
4.7/5.3
 
90 to 200
MHz
-1
 
-2
1.7/2.3
5.3/5.5
5.9/6.1
6.9/7.4
4.9/5.1
 
-3
2.7/3.5
3.5/3.9
5.8/6.0
6.7/7.2
4.9/5.1
 
-4
3.3/5.3
2.5/2.7
5.8/6.1
6.7/7.0
5.0/5.2
 
-5
 4.3/6.3
1.9/2.2 
5.8/6.3
6.4/7.0
5.1/5.6
 
200 to 400
MHz
-1
0.9/1.2
9.9/10.9
5.9/6.3
7.2/7.9
4.6/5.0
 
-2
1.4/2.3
4.8/5.5
5.9/6.5
7.3/8.1
4.6/5.0
 
-3
2.0/3.3
3.4/3.9
5.9/6.3
6.9/7.5
4.9/5.1
 
-4
3.1/4.5
2.4/2.8
5.8/6.3
6.6/7.4
5.0/5.3
 
-5
4.2/6.3
1.9/2.2
5.7/6.3
6.5/7.1
5.0/5.5
 
225 to 400
MHz
-1
0.7/1.2
10.0/10.9
 
 
 
 
-2
1.2/2.3 
 4.8/5.3
 
 
 
 
-3
 1.8/3.3
 3.4/3.9
6.4/6.6
8.4/9.1
4.4/4.6
 
-4
3.1/4.5
2.4/2.8
6.2/6.7
7.6/9.0
4.7/5.1
 
-5
4.4/6.3
2.0/2.2
5.8/6.0
6.5/6.9
5.0/5.2
 
225 to 450
MHz
-1
 
-2
 
 
 
 
-3
2.4/3.5
3.6/3.9
 
-4
 
-5
 
225 to 512
MHz
-1
 
 
 
 
 
 
-2
 
-3
2.4/3.5
3.3/3.9 
 
 
 
 
-4
 
 
 
 
 
 
-5
 
400 to 700
MHz
-1
0.8/1.4 
9.6/10.5
6.2/6.3
7.7/8.0
4.7/4.9
 
-2
1.4/2.3
4.8/5.5
 
-3
 2.3/3.6
 3.4/3.9
5.8/6.3
6.8/7.5 
4.8/5.1 
 
-4
 3.2./4.6
 2.5/2.9
6.0/6.1
6.8/7.0
5.1/5.2
 
-5
4.3/6.3
1.9/2.2
5.8/6.1
6.4/6.8
5.2/5.6
 
700 to 1000
MHz
-1
 
 
 
 
 
 
-2
1.6/2.3
5.0/5.5
5.6/5.8
5.9/6.1
5.4/5.9
 
-3
 
 
 
 
 
 
-4
 
 
 
 
 
 
Series    Frequency(MHz)    Insertion Loss    Connector Type   Options 
MAXI  30-90 SMA AF
                 
    1.5-4     SMA (Female)   A
    4-10    
  B
    10-30         C
    30-90         F
    90-200          
    200-400  
       
    225-400            
    400-700            
    700-1000            

 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


NOTES:

1) Options may be limited to particular frequency bands and/or configurations.
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. There are 250 equally spaced tuning increments across each standard filter band, resulting in 251 tune words from 00000000 to 11111010. the last 5 tune words are reserved for housekeeping functions. 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 in 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 and Control 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  0.7 Vcc  Vcc 
VIL1  Input Low Voltage  A0 - A7  0.0  0.15Vcc 
VIH1  Input High Voltage  A0 - A7  0.7 Vcc  Vcc 

Switching Characteristics

Vcc = +5VDC, ± 10%; T= -40 to +85°C


Symbol

Parameter

Min

Max

Units

tS

Setup Time, A0-A7 to STB

200

 

nS

tH

Hold Time, A0-A7 from STB

6

 

µS

tSH

STB High Time

25

 

µS

tW

STB Pulse Width

20

 

nS

tDW

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

500

 

nS

tACC

Access time from STB to f0

15 

nS


Strobe

The filter is tuned within 15 µS to the frequency designated by the tuneword existing on the eight control bit lines when the line 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. Consult Selection Guide for the maximum strobe rate in each frequency band.

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 stopband 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.

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