Overview
The AD8349ARE, produced by Analog Devices Inc., is a silicon, monolithic RF quadrature modulator designed for operation in the frequency range of 700 MHz to 2700 MHz. This device is optimized for high-performance direct RF modulation in various communication systems, including cellular, PCS, WCDMA, CDMA2000, GSM, EDGE, and wireless LAN applications. The AD8349ARE features a differential LO input signal that is buffered and split into in-phase (I) and quadrature-phase (Q) signals, which are then mixed with the corresponding baseband signals using Gilbert cell mixers. The output of these mixers is summed in an output amplifier, which is designed to drive 50 Ω loads. The device also includes an output disable function, allowing the RF output to be switched on and off within 50 ns.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Frequency Range | 700 MHz to 2700 MHz | |
| Modulation Bandwidth | dc to 160 MHz | |
| 1 dB Output Compression | 5.6 dBm @ 2140 MHz | |
| Noise Floor | –156 dBm/Hz | |
| Phase Quadrature Error | 0.3 degrees @ 2140 MHz | |
| Amplitude Balance | 0.1 dB | |
| Supply Voltage | 4.75 V to 5.5 V | |
| Package Type | 16-lead, exposed-paddle TSSOP | |
| Operating Temperature Range | –40°C to +85°C |
Key Features
- High dynamic range and modulation accuracy for high-performance RF modulation.
- Differential LO input signal with polyphase phase splitter for I and Q signal generation.
- Gilbert cell mixers for mixing baseband signals with LO signals.
- Output amplifier designed to drive 50 Ω loads.
- Output disable function for rapid switching (on/off within 50 ns).
- Single supply operation from 4.75 V to 5.5 V.
- Pin compatible with AD8345/AD8346.
Applications
- Cellular/PCS communication systems infrastructure.
- WCDMA/CDMA2000/PCS/GSM/EDGE base stations.
- Wireless LAN and wireless local loop systems.
- Local multipoint distribution systems (LMDS) and broadband wireless access systems.
- QPSK or QAM broadband wireless access transmitters.
Q & A
- What is the frequency range of the AD8349ARE? The AD8349ARE operates in the frequency range of 700 MHz to 2700 MHz.
- What is the modulation bandwidth of the AD8349ARE? The modulation bandwidth is from dc to 160 MHz.
- What is the 1 dB output compression point of the AD8349ARE? The 1 dB output compression point is 5.6 dBm at 2140 MHz.
- How does the AD8349ARE handle noise? The noise floor is –156 dBm/Hz.
- What is the phase quadrature error of the AD8349ARE? The phase quadrature error is 0.3 degrees at 2140 MHz.
- What is the amplitude balance of the AD8349ARE? The amplitude balance is 0.1 dB.
- What is the supply voltage range for the AD8349ARE? The supply voltage range is from 4.75 V to 5.5 V.
- In what package is the AD8349ARE available? The AD8349ARE is available in a 16-lead, exposed-paddle TSSOP package.
- What is the operating temperature range of the AD8349ARE? The operating temperature range is from –40°C to +85°C.
- Can the AD8349ARE be used as an IF modulator? Yes, the AD8349ARE can be used as an IF modulator in local multipoint distribution systems (LMDS) using complex modulation formats.
