MAX2472-MAX2473 查看數據表（PDF） - Maxim Integrated

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MAX2472-MAX2473

500MHz to 2500MHz VCO Buffer Amplifiers

Maxim Integrated 

PIN

MAX2472

MAX2473

1

—

—

1

2, 5

2, 5

3

—

—

3

4

4

6

6

NAME

OUT1

OUT

GND

OUT2

BIAS

IN

VCC

500MHz to 2500MHz

VCO Buffer Amplifiers

Pin Description

FUNCTION

Open-Collector Buffer Output 1. Connect to VCC via a resistor or

inductor/choke. AC-coupling to the output is required.

Open-Collector Buffer Output. Connect to VCC via a resistor or

inductor/choke. AC-coupling to the output is required.

RF Ground. Connect to the ground plane as close to the IC as possible to

minimize trace inductance.

Open-Collector Buffer Output 2. Connect to VCC via a resistor or

inductor/choke. AC-coupling to the output is required.

Bias Resistor Connection. Connect a resistor from BIAS to GND to set the

output stage bias current and gain. To choose RBIAS, refer to the Typical

Operating Characteristics for the MAX2473.

High-Impedance Input to the Buffer Amplifier

Supply Voltage Input: +2.7V < VCC < +5.5V

Table 1. Output Matching Components

OPERATING

FREQUENCY

(MHz)

600

900

1900

2400

LMATCH

22nH

Coilcraft 0603HS-22NTJBC

12nH

Coilcraft 0603HS-12NTJBC

2.2nH

Murata LQG11AZN2500

1.2nH

Murata LQG11AINZS00

CMATCH

1.5pF

Murata GRM39COG1R5B50V

1pF

Murata GRM39COG1R0B50V

1pF

Murata GRM39COG1R0B50V

1pF

Murata GRM39COG1R0B50V

Detailed Description

The MAX2472/MAX2473 are ideal replacements for dis-

crete solutions where a VCO output must drive more

than one input, especially where high reverse isolation

and low supply currents are mandatory. The MAX2472

features a two-stage wideband architecture with a high-

input-impedance common-emitter amplifier followed by

two separate open-collector output stages. The

MAX2473 features a two-stage wideband architecture

with a high-input-impedance common-emitter amplifier

followed by one open-collector output stage, with the

added feature of output power control. Using values for

RBIAS from 11kΩ to 23kΩ allows the output power of

the MAX2473 to range from -2dBm to -10dBm.

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