MAX2121:Complete Direct-Conversion L-Band Tuner

Industry's First L-Band Tuner with Internal 123MHz IF Filter

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 downconverter. 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 baseband lowpass filters and digitally controlled baseband variable-gain amplifiers. Together, the RF and baseband 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 interface. 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 interface, 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. 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, 5mm x 5mm, 28-pin thin QFN package.

Key Features
  • 925MHz to 2175MHz Frequency Range
  • Monolithic VCO
    • Low Phase Noise: -97dBc/Hz at 10kHz
    • No Calibration Required
  • High Dynamic Range: -75dBm to 0dBm
  • Integrated LP Filters: 123.75MHz
  • Single +3.3V ±5% Supply
  • Low-Power Standby Mode
  • Address Pin for Multituner Applications
  • Differential I/Q Interface
  • I?C 2-Wire Serial Interface
  • Very Small, 5mm x 5mm, 28-Pin TQFN Package
MAX2121: Typical Application Circuit
MAX2121: Typical Application Circuit
Applications/Uses
  • VSATs
DataSheet
titleDownload file
MAX2121?Data SheetMAX2121.pdf
Parametrics
Part NumberRef. Clock Freq.
(MHz)
Input Frequency
(MHz)
IF Output Freq.
(MHz)
Noise Figure
(dB)
VSUPPLY
(V)
ISUPPLY
(mA)
ApplicationsFootprint
(mm x mm)
Oper. Temp.
(°C)
Package/PinsBudgetary
Price
typSee Notes
MAX212112 to 30925 to 2175123.7583.13 to 3.47148VSAT5.0 x 5.0-40 to +85TQFN/28$4.25 @1k
Design kits & evaluation modules
Quality and Environmental Data
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX2121ETI+ActiveTQFN,;28 pin;26 mm?-40°C to +85°CLead Free
MAX2121ETI+TActiveTQFN,;28 pin;26 mm?-40°C to +85°CLead Free
MAX2121.pdf MAX2121
MAX2121.pdf MAX2121
MAX2121.pdf MAX2121
MAX2121.pdf MAX2121
General Layout Guidelines for RF and Mixed-Signal PCBs MAX5862
MAX2121.pdf MAX2121
XML 地图 | Sitemap 地图