3.5GHz Downconverter Mixers

with Selectable LO Doubler

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11

Pin Description

1.2k

Ω,

2k

Ω, 820kΩ

MAX2684

NAME

FUNCTION

1

Supply Voltage Input. Bypass with a 100pF capacitor as close to the pin as possible.

2, 3, 5, 9,

10, 12, 13,

15, EP

GND

Ground. Connect to ground plane with a low-inductance connection. Solder exposed paddle

evenly to the board ground plane.

PIN

4

RFIN

RF Input Port to Mixer. Requires a matching network and a DC-blocking capacitor that may be part

of this network.

6

ENX2

LO Frequency-Doubler Enable Input. Drive low to enable the LO doubler and run external LO at

half frequency. Drive high to disable the LO doubler and run external LO at full frequency.

16

BIAS

supply current of the mixer.

11, 14

IFOUT-,

IFOUT+

Differential, Open-Collector IF Output Ports of Mixer. Requires a matching network and pull-up

8

LOX1

Full-Frequency Local-Oscillator Input to Downconverter Mixer. Requires a DC-blocking capacitor.

Leave unconnected if this pin is not used.

7

LOX2

Half-Frequency Local-Oscillator Input to LO Frequency Doubler, LO Filter, and Downconverter

Mixer. Requires a DC-blocking capacitor. Leave unconnected if this pin is not used.

2k

Ω,

1.2k

Ω, 820kΩ

Typical Operating Characteristics (continued)

Ω, IFOUT+ and IFOUT- matched to single-ended

50