MAXI/4R Series

Specifications:

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:	50 mS
DC Power:	+5 VDC @ 10 to 1000 mA +100 VDC @ 2 mA
Operating Temperature Range:	-40 to + 85°C
Center Frequency Drift:	80 PPM/°C

The MAXI/4R Series of tunable filters provides 4-poles of filtering, for even better rejection than our standard Maxi/Pole filters.  The chassis has been ruggedized to better handle the vibration and shock environments often encountered in customer applications (ie. ground-mobile, airborne, etc.).  The product line includes several standard designs in various frequencies to support almost any application. 

Performance:

The following plot illustrates approximate performance (not representative of all frequency ranges):

Product Numbering Table:

Available Options:

A. Internal DC-DC Converter (Eliminates need for high voltage supply. Requires additional 500 mA of 5 VDC current)
B. Serial Interface
C. Custom Frequency Bands (Specify START and STOP frequencies in MHz)
F. Filtered D-connector

Interface and Control Notes:

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

Switching Characteristics

Strobe 

The filter is tuned within 50 mS 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 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.

Package Outline:

Pinout and Ratings: