MAX2406 データシートの表示（PDF） - Maxim Integrated

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MAX2406

Low-Cost Downconverter with Low-Noise Amplifier

Maxim Integrated 

Low-Cost Downconverter

with Low-Noise Amplifier

______________________________________________________________Pin Description

PIN

1, 3, 4, 10,

11, 12,

15, 20

NAME

GND

2

LNAIN

5, 9

VCC

6

RXEN

7

LO

8

LO

13

IF

14

IF

16

RXMXIN

17

GND

18

GND

19

LNAOUT

FUNCTION

Ground. Connect to ground plane with minimal inductance.

RF Input to the LNA. At 1.9GHz, LNAIN can be easily matched to 50Ω with one external shunt 1pF

capacitor. AC couple to this pin. See the LNA Input Impedance vs. Frequency plot in the Typical

Operating Characteristics.

Supply Voltage (+2.7V to +5.5V). Bypass VCC to GND at each pin with a 47pF capacitor as close to each

pin as possible.

Enable Control Input, active high. Logic high activates all part functions. A logic low places the device in

shutdown mode.

50Ω Local-Oscillator Input Port. AC couple to this pin.

50Ω Inverting Local-Oscillator Input Port. For single-ended LO operation, connect LO directly to GND. If

a differential LO signal is available, AC couple the inverted LO signal to this pin.

Noninverting Side of Downconverter’s Differential Open-Collector IF Output. Pull IF up to VCC with an

inductor. This inductor can be part of the matching network to the desired IF impedance. Alternatively, a

resistor can be placed in parallel to set a terminating impedance.

Inverting Side of Downconverter’s Differential Open-Collector IF Output. Follow recommendations for IF

output above. If single-ended operation is desired, connect IF directly to VCC.

RF Input of Downconverter Mixer. AC couple to this pin. A matching network may be required to match

RXMXIN to an external filter. Consult the Rx Mixer Input Impedance vs. Frequency plot in the Typical

Operating Characteristics.

LNA Output Ground. Connect to ground plane with minimal inductance.

Downconverter Mixer Input Ground. Connect to ground plane with minimal inductance.

LNA Output. This output typically provides a VSWR of better than 2:1 at frequencies from 1.8GHz to 2.5GHz

with no external matching components. At other frequencies, a matching network may be required to match

this pin to an external filter. Consult the LNA Output Impedance vs. Frequency plot in the Typical Operating

Characteristics.

_______________Detailed Description

The following sections describe each of the blocks in

the MAX2406 Functional Diagram.

The MAX2406 consists of four major components: a low-

noise amplifier (LNA), a downconverter mixer, a local-

oscillator (LO) buffer, and a power-management block.

Low-Noise Amplifier

The LNA is a wideband, single-ended cascode amplifi-

er that can be used over a wide range of frequencies.

Refer to the LNA Gain vs. Frequency graph in the

Typical Operating Characteristics. Its port impedances

are optimized for operation around 1.9GHz, requiring

only a 1pF shunt capacitor at the LNA input for a VSWR

of better than 2:1 at the input and output. As with every

LNA, the input match can be traded off for better noise

figure.

Receive Mixer

The receive mixer is a wideband, double-balanced

design with excellent noise figure and linearity.

RF Inputs

The RXMXIN input is typically connected to the LNA

output through an off-chip filter providing enhanced

flexibility. This input is externally matched to 50Ω. See

Figure 1 for an example matching network for 1.9GHz,

and the Rx Mixer Input Impedance vs. Frequency

graph in the Typical Operating Characteristics.

_______________________________________________________________________________________ 5

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