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HF-ERF Series
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The HF-ERF™ is an internally switched 3‑band, low cost, miniature, high performance tunable filter. The HF-ERF™ was designed to have the best insertion loss and Q in the smallest package possible, 2.0” x 2.78” x 0.6”.  All HF-ERF™ filters are fully tested and aligned by Pole/Zero for convenience and ease of use. Both SPI and Parallel control interfaces are available in one filter.  Modified variants are available upon request.

  • Specifications
  • Performance
  • Product Numbering Table
  • Interface And Control Notes
  • Mechanical Details
  • Pinout and Ratings
  • Datasheet
HF-ERF 1st Tab-1

The following plots illustrate approximate performance.

HF-ERF 2nd Tab

HF-ERF 3rd TAB

Example product number: MN-1.5-30-3-S13 or MN-1.5-30-3-S13-C017

General Information:

The HF-ERF™ requires two supply voltages. A +3.3 VDC digital supply and a high bias voltage of +100 VDC is required to bias the diodes. These supply voltages should be adequately filtered as noise present on these pins will influence the RF signal purity.


Digital Interface Information:

The digital interface format is SPI serial or parallel depending on the state of the mode control pin.

MN-1.5-30-3-S13 HF-ERF Mechanical Details

HF-ERF 6th Tab

Notes:

1. First number indicates maximum inband power levels and second number indicates maximum out of band RF power levels either in CW or composite peak for multi-tones.


HF-ERF Downloadable Datasheet PDF

HF-ERF 1-1

1.0 Ordering Information

HF-ERF 2

Note: Options may be limited to particular frequency bands and/or configurations. Consult Pole/Zero for you application.

Example product number: MN-1.5-30-3-S13 or MN-1.5-30-3-S13-C017

2.0 Block Diagram

HF-ERF 3

3.0 Pinout and Functional Information

3.1 Pinout

HF-ERF 4

3.2 Pin Description

HF-ERF 5

4.0 Specifications

4.1 Absolute Maximum Ratings1

Voltages are referenced to GND (ground = 0V). Operating at room temperature (unless otherwise noted).

HF-ERF 6

4.2 Handling Ratings

HF-ERF 7

4.3 Recommended Operating Conditions

HF-ERF 8

4.4 Electrical Characteristics 

All specifications at TA = 23 ºC, Vcc = 5 V, VBB = 100 V, unless otherwise noted.

HF-ERF 9

4.5 Typical Charasteristics

HF-ERF 10

4.6 Timing Requirements

4.6.1 SPI Interface Timing

The SPI tune interface is standard SPI interface with Mode = 0 (CPOL = 0, CPHA = 0) There are always 16 data bits regardless of the tune mode used. Any bits that do not affect the frequency offset of the filter should always be set to 0. The interface receives the data most significant byte and most significant bit first. The SPI interface can be used in legacy and bit weighted tune modes. The SPI interface is selected by leaving SER/PAR floating or pulled to Vcc. Pin j7 and J12 (CS &STB) must be tied together externally for SPI mode to function properly.

HF-ERF 11

Figure 7. Serial Timing Diagram

HF-ERF 12

4.6.2 Parallel Interface Timing

The Parallel tune command interface is an 8-bit wide synchronous parallel interface with a two-byte load. There are always 16 data bits per parallel tune regardless of the tune mode used. Any bits that do not affect the frequency offset of the filter should always be set to 0. A7 is the most significant bit and A0 is the least significant bit. The Parallel interface can be used in legacy and bit weighted tune modes. Keeping SER/PAR pulled to GND will enable the parallel tune command interface.

HF-ERF 13

Figure 8. Parallel Timing Diagram

HF-ERF 14-2

5.0 Functional Description

5.1 Tune Commands

The tune command is a two-byte load tune word. The first byte (MSB) is the band the filter should tune to. The second byte (LSB) is the frequency offset in the chosen band. The tune command is formatted the same for both SPI and parallel interface modes.

HF-ERF 15

HF-ERF 16

6.0 Detailed Description

6.1 Digital Interface

HF-ERF 17

6.2 Example Tune Commands

HF-ERF 18

6.3 Additional Interface Detail

HF-ERF 19

7.0 Tune Time

Tune times include internal processing of the tune command data and the 90% settled RF amplitude response time of the filter. This time excludes the time required to load the tune command into the filter. Low level signal measurements were utilized to show the receive tune time that can be expected.

In addition, RF power in excess of +12 dBm for Band 0 (1.5-4 MHz) and +24 dBm for Bands 1 & 2 is considered to be "hot switching" of the filter. It is recommended that RF is less than 10 dBm for Band 0 (1.5-4 MHz) and +20 dBm for Bands 1 & 2 during a tune event.

HF-ERF 20

8.0 Application Information 

8.1 Application Circuits

HF-ERF 21

HF-ERF 22

9.0 Package Information

9.1 Package Detail and Recommended Pad Layout

HF-ERF 23

10.0 Safety Notes

10.1 Handling Information

HF-ERF 24

HF-ERF 25

HF-ERF 26

11.0 Legal Information

11.1 Disclaimers

Limited warranty and liability - Information in this document is believed to be accurate and reliable. Pole/Zero and its suppliers disclaim all warranties, whether express or implied, including implied warranties of mechantability, fitness for a particular purpose, and non-infringement. The entire risk arising out of use or performance of this information remains with Licensee. Pole/Zero and its suppliers do not make any representations regarding the results of the use of the information in this document.

To the maximum extent permitted by applicable law, in no event will Pole/Zero or its directors, employees, distributors, licensors, suppliers, agents or resellers or suppliers ("Pole/Zero parties") be liable for any indirect, special, incidental, consequential, or exemplary damages, even if such party has been advised of the possibility thereof. The Pole/Zero parties' entire liability will not exceed the sum of the replacement of defective product or provision of a reasonably similar product, at Pole/Zero's discretion. Some jurisdictions do not allow the exclusion or limitation of incidental, consequential or special damages, so this exclusion and limitation may not be applicable to Licensee. The Pole/Zero Parties will not be liable for any claims or damages arising out of content provided by Licensee.

11.2 Right to Make Changes

Pole/Zero Corporation reserves the right to make changes to information published in this document, including without limitation specifications and product descriptions, at any time and without notice. This document supersedes and replaces all information supplied prior to the publication hereof.

12.0

For additional information, please visit /polezero

13.0 Contact and Support

Pole Zero Corporate Office

5558 Union Centre Drive 

West Chester, OH 45069, USA

513-870-9060 (Phone)

support@polezero.com

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