Tunable Filter ( 1.5-30 MHz )

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Tunable Filter (1.5–30 MHz)

Overview :

A tunable bandpass filter covering 1.5 to 30 MHz provides flexible, high-performance selectivity for communications, test, and measurement systems operating across the HF and lower VHF spectrum. This filter is designed to deliver low insertion loss, steep skirts, and adjustable center frequency and bandwidth while preserving signal integrity and minimizing spurious responses.

Key Features :

Frequency range: 1.5 MHz to 30 MHz, continuous tuning
Variable bandwidth: narrow to wide settings (configurable Q)
Low insertion loss: typically < 3 dB across center frequencies
High out-of-band rejection: > 60 dB at specified offsets
High linearity: high 1 dB compression point and low intermodulation distortion (IMD)
Fast tuning: electronic control (voltage or digital interface) for rapid reconfiguration
Compact, rugged package suitable for bench, rack, or embedded use
Optional features: bypass mode, remote control (USB, Ethernet, SPI, I2C), calibration memory, temperature compensation

Tunable Filter (1.5–30 MHz)

Overview :

Key Features :

Frequency range: 1.5 MHz to 30 MHz, continuous tuning
Variable bandwidth: narrow to wide settings (configurable Q)
Low insertion loss: typically < 3 dB across center frequencies
High out-of-band rejection: > 60 dB at specified offsets
High linearity: high 1 dB compression point and low intermodulation distortion (IMD)
Fast tuning: electronic control (voltage or digital interface) for rapid reconfiguration
Compact, rugged package suitable for bench, rack, or embedded use
Optional features: bypass mode, remote control (USB, Ethernet, SPI, I2C), calibration memory, temperature compensation

RF Specifications Table
Parameter	Value
Frequency Range	1.5 – 30 MHz
Bandwidth (Typical)	3.1%
Impedance (Input / Output)	50 Ω
Fc±10% Selectivity	< -28.5 dBc
2Fc	< -60 dBc
Tuning Speed	< 20 μs
Insertion Loss (Typical)	5.8 dB
Insertion Loss (Max)	7.5 dB
Return Loss (Min)	8.0 dB
Tuning Channels
1.5 MHz – 4 MHz	250
4 MHz – 10 MHz	249
10 MHz – 30 MHz	249
RF Input Power (P1dB)
1.5 MHz – 4 MHz	33 dBm
4 MHz – 10 MHz	33 dBm
10 MHz – 30 MHz	33 dBm
In Band Power Handling (Max)	37 dBm
Out of Band Power Handling	37 dBm
IP3
1.5 MHz – 4 MHz	35 dBm
4 MHz – 10 MHz	35 dBm
10 MHz – 30 MHz	37 dBm
Vcc	3.3V ~ 12V
Vbb	NC
DC Current (Max)	≤ 30 mA
Operating Temperature	-40 to +85℃
Control Interface	SPI Interface
Dimensions	2.2 × 2.2 × 0.5 in (55.9 × 55.9 × 12.7 mm)

PIN DESIGNATORS

Pin designators and descriptions
Pin Number	Description	Pin Number	Description
1	GND	14	GND
2	RF IN	15	SPI CLK
3	GND	16	SPI MOSI
4	GND	17	SPI CS
5	N/C	18	N/C
6	N/C	19	Vbb
7	TUNE-READY	20	GND
8	N/C	21	RV OUT
9	N/C	22	GND
10	N/C	23	GND
11	N/C	24	Vcc
12	N/C	25	GND
13	GND

N/C = No Connect
Notes:
1. Tolerances ±0.01 [0.25] unless otherwise specified.
2. Dimensions are in inches [mm].

Ordering Information and Available Bandwidths

Ordering information table
Model Number	(-)	Bandwidth	(-)	Options	Evaluation Board Option
	-		-		Add “-EM” for unit mounted on evaluation board

Options:
A:
B:
C:

Available bandwidths and performance
Frequency Range	1.5 to 30 MHz
Available BW	3.1%	5%	7%
Ftune ±10% Selectivity (Typical)	-28.5 dBc	TBD	TBD
Ftune ±15% Selectivity (Typical)	-35.5 dBc	TBD	TBD
Ftune ±20% Selectivity (Typical)	-41.0 dBc	TBD	TBD
Insertion Loss (Typical)	5.8 dB	TBD	TBD

Corresponding Evaluation Board

Model MTTB20855 series filters are tunable band pass filters that can be tuned over the frequency range of 1.5 to 30 MHz.

The MTTB20855 Evaluation Board is designed to test and evaluate the Model MTTB20855 frequency agile filter. The evaluation board also supports future frequency agile filters within the MTTB20855 family.

The board is used to supply power to the filter, provide tuning control, and facilitate measurement of RF parameters, switching speed, and power consumption.

Tuning control is provided in the form of frequency tune words. The system uses a USB input along with a user interface program to enable frequency tuning of the filter.

The evaluation board includes a dedicated RF thru path for calibration of test equipment, improving the accuracy of RF measurements.

Serial Address Input Timing Diagram

When the SPI_CS line is pulled low, the Tune Ready line goes to a high logic state, indicating that the unit is ready to accept the tune word.

    Tuning begins when the 16th data clock pulse is received while the SPI_CS (Chip Select) line remains low.
  

Once tuning is complete, the Tune Ready line returns to a high logic state.

After sending the 16th clock pulse, the SPI_CS line must be reset high to allow the unit to complete its reset cycle following tuning.

Timing Characteristics

SPI timing and control parameters
Symbol	Parameter	Min	Max	Units
tSS	Setup time MOSI Data to SPICLK	50		ns
tu	Hold Time MOSI Data From SPICLK		0	ns
tCH	Clock High Time	125		ns
tCP	Clock Period	250		ns
tCS	Chip Setup Time (CS falling edge to SPICLK start)	125		ns
tTR	Tune Ready Indicator		200	µs
tACC	Access time from last (16th) SPICLK edge to Fo		200	µs
	Maximum Hop Rate (Tune frequency to next tuned frequency)		1000	Hz

Band Switch Byte & Address Byte

Band switch byte and address byte structure
D15	D14	D13	D12	D11	D10	D9	D8	D7	D6	D5	D4	D3	D2	D1	D0
0	0	0	0	0	0	B1*	B0*	Filter Tune Address**

* Refer to Band Switch Table for B1 and B0 codes.
** Refer to Address Table for selected band start and end addresses.

Band Switch Table

Band switch mapping
Band	B1	B0	Frequency Range
1	0	0	1.5 MHz – 4.0 MHz
2	0	1	4.0 MHz – 10.0 MHz
3	1	0	10.0 MHz – 30.0 MHz
Illegal	1	1	Do Not Select

Address Table

Address range per band
Band	End Address	Frequency Range
1	250	1.5 MHz – 4.0 MHz
2	249	4.0 MHz – 10.0 MHz
3	249	10.0 MHz – 30.0 MHz

Environmental Specification Standards

Environmental and reliability standards
Category	Specification
Temperature	High temperature: MIL-STD-810E, Method 501.3, Procedure I (85°C storage), Procedure II (85°C operating) Low temperature: Method 502.3, Procedure I (-57°C storage), Procedure II (-40°C operating)
Vibration	MIL-STD-810E Method 514.4, Ground Mobile Test Procedure I, Test Condition I – 3.4.7
Shock	MIL-STD-810E Method 516.4, Procedure I – Functional Shock
Reflow	218°C Max (30 seconds)
MSL (Moisture Sensitivity Level)	Level 3

Tunable Filter ( 1.5-30 MHz )

MTT INNOVATIONS PVT. LTD.

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Tunable Filter ( 1.5-30 MHz )

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MTT INNOVATIONS PVT. LTD.

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