Extended Range Filter

Specifications:

Product Number:	MINI-ERF-30-450-5
Frequency Coverage:	30 MHz to 450 MHz
3dB Bandwidth:	12.5% (typ)
Insertion Loss:	4dB (typ)
Input/Output Impedance:	50 Ω
Inband RF Power Handling:	250 milliwatts (input)
Inband Third Order Intercept Point:	>30 dBm (input)
Tuning Control:	3-wire Serial Peripheral Interface (SPI)
Tuning Speed:	<100 mS
DC Power:	+5 VDC @ < 100 mA +20 VDC @ 10 mA +3 VDC(1) @ < 750 mA(2) -3 VDC @ < 750 mA(2)
Operating Temperature Range:	-40 to + 70°C
Center Frequency Drift:	80 PPM/°C
(1) Referenced to 20 VDC supply (2) Utilized in a push/pull configuration ... typical power consumption will be ~2.25W total.

The Extended Range Filter is a multi-band bandpass filter designed for integration in JTRS transceivers where small size, moderate selectivity and low power consumption are paramount.  It provides digitally tunable bandpass filtering from 30 to 450 MHz.

Performance:

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

Interface and Control Notes:

Interface Options 

The filter comes standard with a 3-wire Serial Peripheral Interface (SPI).

DC Control Interface Characteristics

Switching Characteristics

Vcc = +5VDC, ± 10%; T= -40 to +70°C

Chip Select/Load 

The filter is tuned to the frequency designated by the tuneword sent on the Serial Data In (SDI) control line, which is clocked in by the Serial Clock (SCK) line most significant bit (MSB) first while the Chip Select/Load () line is held low.  After the tuneword is sent, the filter is tuned by returning the Chip Select/Load line high.  Maximum clock rate for SCK is 2 MHz and tune time is <100 mS.

RF Power Handling Capability

The filters are designed to operate with RF input power levels up to 250 milliwatts inband.  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 +70°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:

(1)Combined output of the +20V and +3V supplies referenced to ground.