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To minimize complexity of the external PCB layout the Main. Synthesizer loop filter is also datasueet integrated into the IC.
Both AD and AD reference oscillators provides a This is designed for low harmonic con. The integrated voltage controlled oscillator VCO is a com.
AD6548 – (AD6548 / AD6549) Single Chip GSM Radio
This employs a fully auto. The reference input circuitry is different between the AD The 26MHz reference frequency is provided by an external. In this case tem. For direct battery supply connect, and to reduce external cir. The three LDOs provide isolation of the. They also ensure the IC operation is. The following table describes the LDO usage: Rx and Tx baseband. The AD requires only an external low cost crystal as the. The circuitry to oscillate the crystal and.
For good noise immunity. There is a programmable capaci. The oscillator is designed for use with a 26MHz. The crystal is connected as shown in figure 6.
Dedicated control software ensures excellent frequency stabil. The LDO datasheeh require external connection to the respective. The LDOs are designed to be unconditionally stable re. No external Connections, except for decoupling. LDO1 derives its input references from the crystal supply volt.
Product characteristics and specifications are subject to change without notice. MediaTek assumes no obligation regarding future datsheet unless otherwise agreed to in. No responsibility is assumed by MediaTek for its use; nor for any infringements of patents or other rights of third parties, which may result from its use. Datasheet pdf – http: No external ad658 or adjustments are required. This is designed for low harmonic con- tent.
Voltage Controlled Oscillator The integrated voltage controlled oscillator VCO is a com- plete self-calibrating subsystem. This employs a fully auto- mated digital self-calibration function to ensure optimum phase noise performance over the entire frequency range.
Reference Oscillator The reference input circuitry is different between the AD and AD as described in the table. The three LDOs provide isolation of the oscillators daatsheet sensitive circuits from unwanted power supply and cross coupled noise.
They also ensure the IC operation is robust over a wide range of power supply voltages. The AD requires only an external low cost crystal as the frequency reference.
AD Datasheet MediaTek pdf data sheet FREE from
The circuitry to oscillate the crystal and tune its datashewt is fully integrated. For good noise immunity the oscillator is a balanced implementation requiring the crystal to be connected across 2 pins. There is a programmable capaci- tor array included for coarse tuning of fixed offsets e.
The oscillator is designed for use with a 26MHz crystal. Dedicated control software ensures excellent frequency stabil- ity under all circumstances. MediaTek assumes no obligation regarding future manufacture unless otherwise agreed to in writing.
No license is granted by implication or otherwise under any patent or patent rights of MediaTek.