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ATION
EVALU
AVAIL
19-5959; Rev 1; 7/12
KIT
ABLE
Complete Direct-Conversion L-Band Tuner
General Description
The MAX2121 low-cost, direct-conversion tuner IC is
designed for satellite set-top and VSAT applications.
The device directly converts the satellite signals from
the LNB to baseband using a broadband I/Q downcon-
verter. The operating frequency range extends from
925MHz to 2175MHz.
The device includes an LNA and an RF variable-gain
amplifier, I and Q downconverting mixers, and base-
band lowpass filters and digitally controlled baseband
variable-gain amplifiers. Together, the RF and base-
band variable-gain amplifiers provide more than 80dB
of gain control range.
The device includes fully monolithic VCOs, as well as a
complete fractional-N frequency synthesizer.
Additionally, an on-chip crystal oscillator is provided
along with a buffered output for driving additional tuners
Features
o 925MHz to 2175MHz Frequency Range
o Monolithic VCO
Low Phase Noise: -97dBc/Hz at 10kHz
No Calibration Required
o High Dynamic Range: -75dBm to 0dBm
o Integrated LP Filters: 123.75MHz
o Single +3.3V ±5% Supply
o Low-Power Standby Mode
o Address Pin for Multituner Applications
o Differential I/Q Interface
o I 2 C 2-Wire Serial Interface
o Very Small, 5mm x 5mm, 28-Pin TQFN Package
Ordering Information
and demodulators. Synthesizer programming and device
configuration are accomplished with a 2-wire serial inter-
face. The IC features a VCO autoselect (VAS) function
PART
MAX2121ETI+
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
28 TQFN-EP*
that automatically selects the proper VCO. For multituner
applications, the device can be configured to have one
of two 2-wire interface addresses. A low-power standby
mode is available whereupon the signal path is shut
down while leaving the reference oscillator, digital inter-
face, and buffer circuits active, providing a method to
reduce power in single and multituner applications.
*EP = Exposed pad.
+Denotes a lead(Pb)-free/RoHS-compliant package.
Functional Diagram
The device is the most advanced broadband/VSAT
+
28
27
26
25
24
23
22
DBS tuner available. The low noise figure eliminates the
need for an external LNA. A small number of passive
components are needed to form a complete broadband
satellite tuner DVB-S2 RF front-end solution. The tuner
V CC_RF2
V CC_RF1
1
2
INTERFACE LOGIC
AND CONTROL
MAX2121
DC OFFSET
CORRECTION
21
20
IDC+
IOUT-
is available in a very small, 5mm x 5mm, 28-pin thin
QFN package.
Applications
VSATs
GND
RFIN
GC1
3
4
5
19
18
17
IOUT+
QOUT-
QOUT+
V CC_LO
6
EP
DIV2/DIV4
FREQUENCY
SYNTHESIZER
16
V CC_DIG
V CC_VCO
7
15
REFOUT
8
9
10
11
12
13
14
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1
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