NJ88C50

NJ88C50 Dual Low Power Frequency Synthesiser DS3805 - 1.8 July 1995 The NJ88C50 is a low power integrated circuit, designed as the heart of a fast locking PLL subsystem in a mobile radio application. It is manufactured on Mitel Semiconductor 1.4 micron double polysilicon CMOS process, which ensures that low power and low noise performance is achieved. The device contains two synthesisers, one for the generation of VHF signals up to 125MHz and a second for UHF (when used with a mulitmodulus prescaler such as the SP8713/14/15). The main synthesiser has the capability of driving a dual speed loop filter and also can perform Fractional-N interpolation. Both synthesisers use current source outputs from their phase detectors to minimise external components. Various sections may be powered down for battery economy. FEATURES s s s s s s s 30MHz main synthesiser 125MHz auxiliary synthesiser Programmable output current from phase detector - up to 10mA High input sensitivity Fractional-N interpolator Supports up to 4 modulus prescalers SSOP package NP20 Fig.1 Pin assignment ABSOLUTE MAXIMUM RATINGS Storage temperature Operating temperature Supply voltage Voltage on any pin -55°C to +150°C -40°C to +85°C -0.5 to 7.0V -0.3V to (VDD + 0.3V) APPLICATIONS s s s s s NMT, AMPS, ETACS cellular GSM, IS-54, RCR-27 cellular DCS1800 microcellular DLMR, DSRR, TETRA DECT, PHP cordless telephones ORDERING INFORMATION NJ88C50\IG\NPAS - (Industrial temp range in SSOP package) Fig.2 Simplified blo...