max2121 Maxim Integrated Products, Inc., max2121 Datasheet

max2121

Manufacturer Part Number

max2121

Description

Complete Direct-conversion L-band Tuner

Manufacturer

Maxim Integrated Products, Inc.

Datasheet

1.MAX2121.pdf (1 pages)

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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

and demodulators. Synthesizer programming and device

configuration are accomplished with a 2-wire serial inter-

face. The IC features a VCO autoselect (VAS) function

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.

The device is the most advanced broadband/VSAT DBS

tuner available today. 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 is

available in a very small 28-pin Thin QFN package.

19-XXXX; Rev 0; 6/11

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.

VSATs

Complete Direct-Conversion L-Band Tuner

________________________________________________________________ Maxim Integrated Products

General Description

Applications

o 925MHz to 2175MHz Frequency Range

o Monolithic VCO

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

o Very Small 28-Pin TQFN Package

* EP = Exposed pad.

+ Denotes a lead(Pb)-free/RoHS-compliant package.

MAX2121ETI+

CC_VCO

CC_RF2

CC_RF1

CC_LO

RFIN

GND

GC1

C 2-Wire Serial Interface

Low Phase Noise: -97dBc/Hz at 10kHz

No Calibration Required

PART

INTERFACE LOGIC

AND CONTROL

DIV2/DIV4

-40°C to +85°C

TEMP RANGE

Ordering Information

Functional Diagram

MAX2121

SYNTHESIZER

FREQUENCY

CORRECTION

DC OFFSET

PIN-PACKAGE

28 TQFN-EP*

Features

IDC+

IOUT-

IOUT+

QOUT-

QOUT+

REFOUT

CC_DIG

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