MAX2104
Direct-Conversion Tuner IC for Digital DBS Applications
Part Details
- Low-Cost Architecture
- Operates from Single 5V Supply
- 925MHz to 2175MHz Input Frequency Range
- On-Chip Quadrature Generator, Dual-Modulus Prescaler (/32, /33)
- On-Chip Crystal Amplifier
- PLL Mixer with Gain-Controlled Charge Pump
- Input Levels: -25dBm to -65dBm per Carrier
- Over 40dB Gain Control Range
- Noise Figure = 11.5dB; IIP3 = 7dBm (at 1550MHz)
- Automatic Baseband Offset Correction
- Loopthrough Replaces External Splitter
- Crystal Output Buffer
The MAX2104 low-cost direct-conversion tuner IC 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 MAX2104 directly converts L-band signals to baseband signals using a broadband I/Q downconverter. The operating frequency range extends from 925MHz to 2175MHz.
The IC includes an LNA gain control, I and Q downconverting mixers, lowpass filters with gain control and frequency control, a local oscillator (LO) buffer with a 90° quadrature network, and a charge-pump based PLL for frequency control. The MAX2104 also has an on-chip LO, requiring only an external varactor-tuned LC tank for operation. The output of the LO drives the internal quadrature generator and dual modulus prescaler. An on-chip crystal amplifier drives a reference divider as well as a buffer amplifier to drive off-chip circuitry. The MAX2104 is offered in a 48-pin TQFP-EP package.
Applications
- Broadband Systems
- DirecTV, PrimeStar, EchoStar DBS Tuners
- DVB-Compliant DBS Tuners
- LMDS
Documentation
Data Sheet 1
Reliability Data 1
Technical Articles 2
This is the most up-to-date revision of the Data Sheet.
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