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OM5156M
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MFG:PHILIPS Package Cooled:SOP D/C:1996

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Part Number: OM5156M

MFG: PHILIPS

Package Cooled: SOP

D/C: 1996

Description: The OM5156M BICMOS device integrates prescalers, programmable dividers, and phase comparators to implement two phase-lo...

OM5156M General Description

The OM5156M BICMOS device integrates prescalers, programmable dividers, and phase comparators to implement two phase-locked loops. The device is designed to operate from 3 NiCd cells, in pocket phones,with low current and a wide supply voltage range from 2.7 to 5.5 V.

The principal synthesizer operates at RF input frequencies up to 2 GHz the auxiliary synthesizer operates at 300 MHz. The auxiliary loop is intended for the first IF or to transmit offset loop-frequency settings. Each synthesizer has a fully programmable reference divider. All divider ratios are supplied via a 3-wire serial programming bus.

Separate power and ground pins are provided to the analog and digital circuits. The ground leads should be externally short-circuited to prevent large currents flowing across the die and thus causing damage. Digital supplies VDD1 and VDD2 must also be at the same potential. V_CC must be equal to or greater than V_DD (i.e. V_DD = 3 V and V_CC = 5 V for wider tuning range).

The principal synthesizer phase detector uses two charge pumps, one provides normal loop feedback, while the other is only active during fast mode to speed-up switching. The auxiliary loop has a separate phase detector. All charge pump currents (gain) are fixed by an external resistance at pin ISET (pin 14). Only passive loop filters are used; the charge-pumps function within a wide voltage compliance range to improve the overall system performance.

OM5156M Features

· Low current from 3V supply
· Fully programmable RF divider
· 3-line serial interface bus
· Second synthesizer to control first IF or offset loop frequency
· Independent fully programmable reference dividers for each loop, driven from external crystal oscillator
· Dual phase detector outputs to allow fast frequency switching
· Dual power-down modes.

OM5156M Typical Application

· 2 GHz mobile telephones
· Portable battery-powered radio equipment.

OM5156M Connection Diagram

OM5156M datasheet

OM5156M
PDF/DataSheet Download

Datasheet: OM5156M
File Size: 164455 KB
Manufacturer: PHILIPS [Philips Semiconductors]
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