Features: · Complete Low-Cost Solution for DBS Direct Downconversion
· High Level of Integration Minimizes Component Count
· 1MBaud to 45MBaud Operation
· Selectable LO Buffer
· +5V Single-Supply Operation
· 925MHz to 2175MHz Input Frequency Range
· On-Chip Quadrature Generator, Dual-Modulus Prescaler (/32, /33)
· On-Chip Crystal Oscillator Amplifier
· PLL Phase Detector with Gain-Controlled Charge Pump
· Input Levels: -25dBm to -68dBm per Carrier
· Over 50dB Gain Control Range
· Noise Figure = 10.6dB; IIP3 = +10.7dBm (at 1550MHz)
· Automatic Baseband Offset CorrectionApplication·U.S. DSS Set-Top Receivers
·European DVB-Compliant
·Systems
·Cellular Base Stations
·Wireless Local Loop
·Broadband Systems
·LMDS
·Professional Receivers
·VSAT
·Microwave LinksPinout
SpecificationsVCC to GND..........................................................-0.3V to +7V
All Other Pins to GND..............................-0.3V to (VCC + 0.3V)
RFIN+ to RFIN-, TANK+ to TANK-,
IDC+ to IDC-, QDC+ to QDC- ........................................±2V
IOUT_, QOUT_ to GND Short-Circuit Duration .....................10s
LOBUF+/PSOUT+, LOBUF-/PSOUT- Short-Circuit Duration....10s
VRLO Short-Circuit Duration...................................................0s
Continuous Current (any pin other than VCC or GND)......20mA
Continuous Power Dissipation (TA = +70°C)
44-Pin QFN-EP (derate 27mW/°C above +70°C)........1.8W
Operating Temperature ....................................0°C to +85°C
Junction Temperature..................................................+150°C
Storage Temperature Range .......................-65°C to +150°C
Lead Temperature (soldering, 10s) .............................+300°C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
DescriptionThe MAX2114 low-cost, direct-conversion tuner is designed for use in digital direct-broadcast satellite (DBS) television set-top box units. Its direct-conversion architecture reduces system cost compared to devices with IF-based architectures. The MAX2114 directly tunes L-band signals to baseband using a broadband I/Q downconverter. The operating frequency range spans 925MHz to 2175MHz.
The MAX2114 includes a low-noise amplifier (LNA) with gain control, I and Q downconverting mixers, lowpass filters with gain and frequency control, a local oscillator (LO) buffer with a 90° quadrature network, and a charge-pump-based phase-locked loop (PLL) for frequency control. The MAX2114 has an on-chip LO,requiring only an external varactor-tuned LC tank for operation. The LO's output drives the internal quadrature generator and has a buffer amplifier to drive offchip circuitry. The MAX2114 comes in a 44-pin QFN package with exposed paddle (EP).
MAX2114 Data Sheet
