PMB2240

The PMB2240 is designed as one kind of external RF oscillator module that is divided by the integrated 64/65 prescaler which can be connected to the CMOS PLL circuit PMB2306 for the RF oscillator PLL. There are four independent supply voltages of PMB2240 ( VCC1-3,VCCPR ) and ground rails ( GND1-4 ) to decouple the modulator/mixer parts, the synthesizer parts, and the RFVCO parts. And this device can be used in wide range of applications such as (1)Vector modulated digital mobile cellular systems as GSM, DAMPS, PDC,WLAN etc.; (2)Various modulation schemes, such as PM, PSK, FSK, QAM, QPSK, GMSK etc.; (3)Analog systems with FM and AM modulation; (4)Space and power saving optimizations of existing discrete transmitter circuits.

Features of the PMB2240 are:(1)Transmitter with I/Q modulator; (2)Direct I/Q modulation; (3)Generation of orthogonal carriers with possibility of phase adjust with external resistors at OFF1/OFF2; (4)32dB minimum carrier rejection, 35dB minimum SSB rejection with 1 Vpp I/Q drive level; (5)50dB rejection of third order products with 1 Vpp I/Q drive level; (6)-3dBm output power at 1 Vpp I/Q drive level with 200 Ohms load according testcircuit 1; (7)RF oscillator signal is AC-coupled to internal buffer stage (symmetrical or unsymmetrical); (8)The RF oscillator-signal is buffered for off-chip use, especially for receiver chip PMB2405.; (9)Prescaler for the RF oscillator signal; (10)Possibility to build RF-PLL with integrated prescaler + PMB2306; (11)- Possibility to use the IF oscillator signal from the IF-VCO on PMB2405; (12)- Possibility to use external source for IF oscillator-signal; (13)- Digital parts of fixed IF frequency PLL (fixed-PLL) for IF-VCO on PMB2405; (14)- Supply voltage range from 2.7 V to 4.5 V; (15)- P-TQFP-48 package; (16)- Temperature range -30° to 85°C.

The absolute maximum ratings of the PMB2240 can be summarized as:(1)Supply Voltage: -0.3 to 5.0 V;(2)Input/Output Voltage: -0.3 to 5.0 V;(3)Open Collector Output Voltage at E/EX: VCC - 1.5 to VCC + 1.0 V;(4)Open Collector Output Voltage at MO/MOX: -0.3 to 5.0 V;(5)Differential Input Voltage: 2 V;(6)Junction Temperature: -40 to 125 °C;(7)Storage Temperature: -55 to 125 °C;(8)Thermal Resistance (junction to ambient): 165 K/W;(9)ESD integrity: -1000 to +1000 V. If you want to know more information about PMB2240, please download the datasheet in www.seekic.com or www.chinaicmart.com .