Specifications and infor mation are subject to change without notice

WJ Communications, Inc

• Phone 1-800- WJ1-4401 • FAX: 408-577-6621 • e- mail: sales@wj.com • Web site: www.wj.com

October 2004

MH303

Cellular-Band Quad-FET Mixer

Product Information

Product Features

green/RoHS-compliant

Package

Applications

•

Industrial

•

Portable

•

Handheld

Product Description

The MH303 is a passive Quad-MOSFET mixer that

provides high dynamic range performance in a low cost

3x3 mm 6-pin DFN (Dual Flat No-Lead) lead-

free/green/RoHS-compliant package.

WJ’s MH303 uses patented techniques to realize +28

dBm Input IP3 at an LO drive level of +13 dBm when

used in a simple application circuit with a low-side LO

configuration. The LO can also be driven with higher

power levels up +20 dBm to achieve higher IP3

performance. This mixer integrates internal circuitry to

provide single-ended interfaces for the RF & LO ports.

Typical

applications

include

frequency

up/down

conversion, modulation and demodulation for receivers

and transmitters used in various current and next

generation RFID technologies such as EPC, ISO, ETSI,

and ANSI.

Their small size makes them ideal for

PCMCIA applications.

Functional Diagram

MH303

IF1

GND

LO

IF2

GND

RF

4

5

6

3

2

1

Function

Pin No.

IF Differential Input

1

LO port

3

RF port

4

IF differential Input

6

Ground

2, 5

Specifications

Parameters

Units

Minimum

Typical

Maximum Comments

RF Frequency Range

MHz

820

920

LO Frequency Range

MHz

720

900

IF Frequency Range

MHz

20

70

100

See note 2

SSB Conversion Loss

dB

7.5

8.0

See note 3

Input IP3

dBm

+26

+27

RF = 820 MHz, See note 4

Input IP3

dBm

+27

+28

RF = 870 MHz, See note 4

Input IP3

dBm

+26

+27

RF = 920 MHz, See note 4

Input 1 dB Compression Point

dBm

+17.5

See note 5

Noise Figure

dB

8

LO Input Drive Level

dBm

+13

LO-RF Isolation

dB

35

38

LO freq = 750 – 850 MHz

LO-IF Isolation

dB

40

44

LO freq = 750 – 850 MHz

Return Loss: RF Port

dB

18

Return Loss: LO Port

dB

12

Return Loss: IF Port

dB

10

1. Data was taken using an application board in a 50

Ωsystem, with a low side LO at +13 dBm in a downconverting application at 25°C with an IF frequency = 70 MHz.

2. An IF frequency of 70 MHz is a nominal frequency. The IF frequency can be specified by the user within the constraints of the specified minimum and maximum RF and LO frequency range.

3. The conversion loss includes the loss of an IF transformer (M/A COM ETC1-1-13, nominal loss 0.7 dB at 70 MHz).

4. Input IP3 is measured with two tones with an input power of +3 dBm / tone separated by 1 MHz.

5. Although the input P1dB level is much higher, the continuous RF input power should not exceed +12 dBm. Operation above +12 dBm may cause permanent damage.

Absolute Maximum Ratings

Parameters

Rating

Operating Case Temperature

-40° to +85

° C

Storage Temperature

-40° to +125° C

LO Input Power

+20 dBm

RF Input Power

+12 dBm

Operation of this device above any of these parameters may cause permanent damage.

Ordering Information

Part No.

Description

MH303

Cellular-band Quad-FET Mixer

(lead-tin plated pins)

MH303-G

Cellular-band Quad-FET Mixer

(lead-free/green/RoHS-compliant Package)

MH303-PCB

Fully -Assembled MH303 Application Board