WCDMA Quasi-Direct Modulator with VGA and PA Driver
DescriptionThe MAX2395 fully monolithic quasi-direct modulator IC is designed for use in WCDMA/UMTS transmitters. The quasi-direct modulation architecture reduces system cost, component count, and board space compared to transmitters using an IF SAW filter with IF VCO and IF synthesizer blocks.
The MAX2395 includes I/Q baseband filters, an IF I/Q modulator with VGA, a fully monolithic VCO with PLL, an upconverter mixer, an RF VGA, and a power amplifier (PA) driver. The use of the quasi-direct modulator scheme ensures 5% (typ) EVM and a 30dB (min) carrier suppression. The RF VGA and IF VGA provide a nominal 90dB of output power control. No external local oscillators are required, enabling efficient implementation of variable duplex offset systems.
The PLL is programmed by loading data on the SPI™/MICROWIRE™-compatible 3-wire serial bus. The IC operates from a single +2.7V to +3.3V supply. The devices are available in space-saving 28-pin QFN and thin QFN exposed-pad packages (5mm x 5mm).
- 5% EVM for POUT = +6dBm
- 1920MHz to 1980MHz Operation
- +2.7V to +3.3V Single-Supply Operation
- +6dBm Output Power at 72mA
- 81dB Minimum Automatic Gain-Control (AGC) Range
- Automatic ICC Throttle Back for Optimal Power Consumption
- No IF SAW Filter Necessary
- On-Chip RF PLL, with Fully Monolithic VCO
- Ultra-Low External Component Count
- UMTS/EDGE Phones
- W-TDD Phones
- WCDMA Phones
Technical DocumentsTutorial 5100 General Layout Guidelines for RF and Mixed-Signal PCBs
App Note 3040 MAX2395 Output Matching to a SAW Filter for Optimum Cascaded Gain Flatness
App Note 2009 Performance of the MAX2395 PLL with 80kHz Comparison Frequency
|Device||Fab Process||Technology||Sample size||Rejects||FIT at 25°C||FIT at 55°C||Material Composition|
|Tutorial||5100||General Layout Guidelines for RF and Mixed-Signal PCBs|
|App Note||3040||MAX2395 Output Matching to a SAW Filter for Optimum Cascaded Gain Flatness|
|App Note||2009||Performance of the MAX2395 PLL with 80kHz Comparison Frequency|