MAX2051ETP+T【PDF 14/16 页】IC UP/DOWNCONVERSION MIXR 20TQFN

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SiGe, High-Linearity, 850MHz to 1550MHz

Up/Downconversion Mixer with LO Buffer

Detailed Description

The MAX2051 high-linearity up/downconversion mixer

provides +35dBm of IIP3, with a typical 7.8dB noise fig-

ure (NF) and 7.4dB conversion loss. The integrated

baluns and matching circuitry allow for 50 Ω single-

ended interfaces to the RF and the LO ports. The inte-

grated LO buffer provides a high drive level to the mixer

core, reducing the LO drive required at the MAX2051’s

input to a -3dBm to +3dBm range. The IF port incorpo-

rates a differential output, which is ideal for providing

enhanced 2RF-LO and 2LO-2RF performance. 2RF-LO

rejection is typically 88dB and 2LO-2RF rejection is typ-

ically 79dB at an RF drive level of -14dBm.

Specifications are guaranteed over broad frequency

ranges to allow for use in VOD, DOCSIS-compatible

Edge QAM modulation, and CMTS. The MAX2051 is

specified to operate over an RF input range of 850MHz

to 1550MHz, an LO range of 1200MHz to 2250MHz,

and an IF range of 50MHz to 1000MHz.

RF Port and Balun

The MAX2051 RF input provides a 50 Ω match when com-

bined with a series 47pF DC-blocking capacitor. This DC-

blocking capacitor is required because the input is

internally DC shorted to ground through the on-chip

balun. The RF port input return loss is typically 12dB over

the RF frequency range of 1000MHz to 1250MHz.

LO Inputs, Buffer, and Balun

The MAX2051 is optimized for high-side LO injection

applications with a 1200MHz to 2250MHz LO frequency

range. The LO input is internally matched to 50 Ω ,

requiring only a 47pF DC-blocking capacitor. A two-

stage internal LO buffer allows for a -3dBm to +3dBm

LO input power range. The on-chip low-loss balun,

along with an LO buffer, drives the double-balanced

mixer. All interfacing and matching components from

the LO inputs to the IF outputs are integrated on-chip.

Table 1. Component Values

High-Linearity Mixer

The core of the MAX2051 is a double-balanced, high-

performance passive mixer. Exceptional linearity is pro-

vided by the large LO swing from the on-chip LO

buffer. IIP3, 2RF-LO rejection, and noise figure perfor-

mance are typically +35dBm, 88dBc, and 7.8dB,

respectively.

Differential IF Output

The MAX2051 has an IF frequency range of 50MHz to

1000MHz. The device’s differential ports are ideal for

providing enhanced 2RF-LO performance. Single-

ended IF applications require a 1:1 (impedance ratio)

balun to transform the 50 Ω differential IF impedance to

a 50 Ω single-ended system.

Applications Information

Input and Output Matching

The RF and LO ports are designed to operate in a 50 Ω

system. Use DC blocks at RF and LO inputs to isolate

the ports from external DC while providing some reac-

tive tuning. The IF output impedance is 50 Ω (differen-

tial). For evaluation, an external low-loss 1:1 balun

transforms this impedance to a 50 Ω single-ended out-

put (see the Typical Application Circuit).

Externally Adjustable Bias

Bias currents for the LO buffer is optimized by fine-tun-

ing resistor R1. The value for R1, as listed in Table 1,

represents the nominal value, which yields the optimal

linearity/performance trade off. Use larger value resis-

tors (up to 125 Ω ) to reduce power dissipation at the

expense of some performance loss. Use smaller value

resistors (down to 0 Ω ) to increase the linearity of the

device at the expense of more power. Contact the fac-

tory for details concerning recommended power reduc-

tion vs. performance trade-offs. If ±1% resistors are not

readily available, ±5% resistors can be substituted.

DESIGNATION

C1, C9

C2

C3, C4

C5, C7, C10

C6, C8, C11

R1

T1

U1

QTY

2

1

2

3

3

1

1

1

DESCRIPTION

47pF microwave capacitors (0402)

1.3pF microwave capacitor (0402)

150pF microwave capacitors (0402)

100pF microwave capacitors (0402)

0.01μF microwave capacitors (0402)

61.9 Ω ±1% resistor (0402)

1:1 transformer (50:50) MABACT0060

MAX2051 IC (20 TQFN-EP)

SUPPLIER

Murata Electronics North America, Inc.

Murata Electronics North America, Inc.

Murata Electronics North America, Inc.

Murata Electronics North America, Inc.

Murata Electronics North America, Inc.

Digi-Key Corp.

M/A-Com, Inc.

Maxim Integrated Products, Inc.

14

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