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NJ88C50/MA/NP Datasheet(PDF) 1 Page - Zarlink Semiconductor Inc |
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NJ88C50/MA/NP Datasheet(HTML) 1 Page - Zarlink Semiconductor Inc |
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1 / 17 page  ABSOLUTE MAXIMUM RATINGS Storage temperature -55 °C to +150°C Operating temperature -40 °C to +85°C Supply voltage -0.5 to 7.0V Voltage on any pin -0.3V to (VDD + 0.3V) NJ88C50 Dual Low Power Frequency Synthesiser DS3805 ISSUE 1.8 June 2002 Ordering Information NJ88C50/MA/NP - (Industrial temp range in SSOP package) NP20 1 2 3 4 5 6 7 8 9 20 19 18 17 16 15 14 13 12 NJ88C50 10 11 AVDD FIM FIMB DATA CKIN STROBE RI FIA RSA PDA AGND MOD2 MOD1 SCREEN RSC RSM VDD PDP GND PDI Figure 1 - Pin assignment 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 • 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 APPLICATIONS • NMT, AMPS, ETACS cellular • GSM, IS-54, RCR-27 cellular • DCS1800 microcellular • DLMR, DSRR, TETRA • DECT, PHP cordless telephones Figure 2 - Simplified block diagram RSM RSC LATCH LATCH LATCH LATCH AUX. N-DIVIDER MAIN N-DIVIDER PHASE DETECTOR PHASE DETECTOR FRACTIONAL-N SYSTEM CURRENT SOURCE CURRENT SOURCE MAIN N BUFFER SERIAL INPUT REGISTER R BUFFER AUX. N BUFFER R DIVIDER FIM FIMB DATA CKIN STROBE RI FIA RSA PDA PDP PDI MOD2 MOD1 QBAR Q |
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