Home | PZ
MICRO-ERF Series

The MICRO-ERF® Extended Range Series of tunable filters was developed to address applications needing a small, surface mount package with wide tunability. This tunability is accomplished by the use of three internal tunable filters along with GaAs RF band select switches all in one housing. The tunable filters are varactor based in order to minimize size and power consumption. Parallel or serial digital interface can be selected by a mode pin for ease of integration into your design.

  • Specifications
  • Performance
  • Micro-ERF Evaluation Board
  • Interface And Control Otions
  • Mechanical Details
  • Pinout and Ratings
Frequency Coverage: 30 to 512 MHz
Input/Output Impedance: 50 Ω
Inband Input/Output VSWR: 1.5: 1 typical, 2.2: 1 max
Ultimate Attenuation: 55 dB typical
Insertion Loss: 4 dB ± 1 dB typical
Percent Bandwidth: 5%  ± 1
Shape Factor (30 dB/3 dB): 6  ± 0.5 typical, 8 max
Inband RF Power Handling: 1 milliwatt (input)
Out of Band RF Power Handling: 50 milliwatt (input)
Inband Third Order Intercept Point: +10 dBm (input)
Tuning Control: Parallel or Serial
Tuning Speed: 25 µsec typical, 35 µsec max
DC Power +5 VDC (2.3 mA to 3.2 mA) 25 mA peak
+1.65 to +5.5VDC 18uA max;
+20VDC (4 mA max)
Operating Temperature Range: -40 to +85°C
 Size (in. / mm.)  .25 x 1.7 x 1.9 / 6.4 x 42 x 47
 Weight:  0.6 oz. / 17 g.

The following plots illustrate approximate performance.
  

 
General Information:
The Micro-ERF® requires two supply voltages. A +5 VDC logic supply and a high bias voltage of +20 VDC is required to bias the varactor diodes. Theses supply voltage should be adequately filtered as noise present on these pins will influence the RF signal purity.

Digital Interface Information:
The digital interface format can be either SPI serial or parallel depending on the state of the mode control pin. All data input pins are universal data bus capable of 1.8-V, 2.5-V, 3.3-V, and 5-V voltage nodes and selected by the VCCD supply.


Pin #

REF DES

DESCRIPTION

MAXIMUM RATING

1

Ser/Par

Serial/Parallel Mode Control

VCCD + 0.5VDC

2

TR

Tune Ready Output

3

VCCD

Digital Interface Supply

-0.5 to +6.5v

4

A7/
SPICLK

Tune Bit 7(MSB)/
SPI Clock

VCCD + 0.5VDC

5

A6

Tune Bit 6

6

A5/
MOSI

Tune Bit 5/ SPI Data Input

7

A4/
CS_LD

Tune Bit 4/SPI Chip Select

8

A3

Tune Bit 3

9

A2

Tune Bit 2

10

A1

Tune Bit 1

11

A0

Tune Bit 0 (LSB)

12

STB

Strobe

13

VCCA

+5 VDC

-0.5 to +5.5v

14

GND

Ground

 

15

Vbb

High Bias (+20 VDC)

+30 vdc

16

GND

Ground

 

17

RF

RF In/Out

+10 dBm, +17 dBm1

18

GND

Ground

 

19-20

GND

Ground

 

21

GND

Ground

 

22

RF

RF In/Out

+10 dBm, +17 dBm1

23

GND

Ground

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.
Products
our-products.jpg