Rainbow-electronics MAX2389 Bedienungsanleitung PDF herunterladen (Seite 9)

IF Output Port

The mixer output appears on the differential IF+ and IF-

pins. These open-collector outputs require an external

inductor to V

for DC biasing. This port typically

requires a matching network for coupling to an external

IF filter. Figures 1 and 2 show examples of differential

and single-ended IF port connections.

Applications Information

Layout

A properly designed PC board is essential to any

RF/microwave circuit. Keep RF signal lines as short as

possible to minimize losses and radiation. Always use

controlled impedance lines on all high-frequency inputs

and outputs and use low-inductance connections to

ground on all GND pins. At the mixer outputs, keep the

differential lines together and of the same length to

ensure signal balance.

For the best gain and noise performance, use high-

quality components for the LNA input matching circuit,

and solder the slug evenly to the board ground plane.

For the power supplies, a star topology works well to

isolate between different sections of the device. Each

node has its own path to a central V

. Place

decoupling capacitors that provide low impedance at

the RF frequency of interest close to all V

connec-

tions. The central V

should have a large decoupling

capacitor as well. (Use MAX2387/MAX2388/MAX2389

EV kit as an example.)

Chip Information

TRANSISTOR COUNT: 208

MAX2387/MAX2388/MAX2389

W-CDMA LNA/Mixer ICs

_______________________________________________________________________________________ 9

BIAS_SET

GND

LNA_IN

SAW

CC V

IF+

IF-

LO+

VCO

10kΩ

24kΩ

10kΩ

20Ω

10nF

10µF

82pF

2.2nH

27nH

10nF

82pF

22pF

39pF

6800pF

0.8pF

6800pF

0.8pF

LO-

LNA_OUT

GAIN

MIX_IN

SHDN

BIAS

MAX2387

MAX2388

MAX2389

RX BPF

Figure 1. MAX2387/MAX2388/MAX2389 Differential IF Load; Single-Ended VCO

Typical Application Circuits

1 2 3 4 5 6 7 8 9 10 11

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