The S1M8831A/33 is a dual synthesizer supporting RF and IF frequencies up to 1.2GHz RF and 520MHz IF. It uses the ∑-∆ fractional-N technology to solve the fractional spurs problem in other fractional-N synthesizers based on charge pump compensation. The device also supports accurate programming of the PCS/CDMA channel frequency in 10kHz steps.
The document describes the S1M8831A/33, a Fractional-N frequency synthesizer with integrated prescalers designed for RF operation up to 1.2GHz and IF operation up to 520MHz. It features dual-modulus prescalers, programmable charge pump output current, and low phase noise performance suitable for wireless cell phones.
| Operating Frequency (IF) | 45 to 520MHz |
|---|---|
| Operating Voltage Range | 2.7V to 4.0V |
| Current Consumption (S1M8831A) | 5.0mA |
| Current Consumption (S1M8833) | 7.0mA |
| Package Type | 24-QFN-3.5x4.5 |
| Operating Temperature Range | -40 to +85°C |
The frequency resolution is 10kHz or 64 steps when fref is 9.84MHz.
They are designed for high-rate data-service cellular telephones (CDMA) and portable wireless communications (Korean-PCS).
The typical current consumption in selectable power saving mode is 1µA at 3V.