MAX2051ETP+ Maxim Integrated Products, MAX2051ETP+ Datasheet - Page 14

• Manufacturer Part Number: MAX2051ETP+
• Description: RF Mixer SiGe High-Linearity Mixer w/LO Buffer
• Manufacturer: Maxim Integrated Products

Specifications of MAX2051ETP+

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

SiGe, High-Linearity, 850MHz to 1550MHz
Up/Downconversion Mixer with LO Buffer
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 50Ω 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.
The MAX2051 RF input provides a 50Ω 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.
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 50Ω,
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
14
DESIGNATION
C5, C7, C10
C6, C8, C11
______________________________________________________________________________________
C1, C9
C3, C4
C2
U1
R1
T1
QTY
LO Inputs, Buffer, and Balun
2
1
2
3
3
1
1
1
Detailed Description
47pF microwave capacitors (0402)
1.3pF microwave capacitor (0402)
150pF microwave capacitors (0402)
100pF microwave capacitors (0402)
0.01µF microwave capacitors (0402)
61.9Ω ±1% resistor (0402)
1:1 transformer (50:50) MABACT0060
MAX2051 IC (20 TQFN-EP)
RF Port and Balun
DESCRIPTION
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.
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 50Ω differential IF impedance to
a 50Ω single-ended system.
The RF and LO ports are designed to operate in a 50Ω
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 50Ω (differen-
tial). For evaluation, an external low-loss 1:1 balun
transforms this impedance to a 50Ω single-ended out-
put (see the Typical Application Circuit ).
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 125Ω) to reduce power dissipation at the
expense of some performance loss. Use smaller value
resistors (down to 0Ω) 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.
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.
Applications Information
Input and Output Matching
Externally Adjustable Bias
SUPPLIER
Differential IF Output
High-Linearity Mixer