SA8028

General description

The SA8028 BICMOS device integrates programmable dividers, charge pumps and phase comparators to implement phase-locked loops. The device is designed to operate from 3 NiCd cells, in pocket phones, with low current and nominal 3 V supplies.

The synthesizer operates at VCO input frequencies up to 2.5 GHz. The synthesizer has fully programmable RF, IF, and reference dividers. All divider ratios are supplied via a 3-wire serial programming bus. The RF divider is a fractional-N divider with programmable integer ratios from 33 to 509 and a fractional resolution of 22 programmable bits (23 bits internal). A 2^nd order sigma-delta modulator is used to achieve fractional division.

Separate power and ground pins are provided to the charge pumps and digital circuits. V_DDCP must be equal to or greater than V_DD . The ground pins should be externally connected to prevent large currents from flowing across the die and thus causing damage.

The charge pump current (gain) is fully programmable, while I_SET is set by an external resistance at the R_SET pin (refer to section 1.5, RF and IF Charge Pumps). The phase/frequency detector charge pump outputs allow for implementing a passive loop filter.

Features

• Extremely low phase noise:

L_(f) =-101 dBc/Hz at 5 kHz offset at 800 MHz
• Low power
• Programmable Normal and Integral charge pump outputs:

Maximum output = 10.4 mA
• Digital fractional spurious compensation
• Hardware and software power-down
• I_DDsleep < 0.1 uA (typ) at V_DD= 3.0 V
• Seperate supply for V_DD and V_DDCP
• Programmable loop filter bandwidth

Products/packages

Pricing/ordering/availability

Applications

• 500 to 2500 MHz wireless equipment
• Cellular phones, all standards including:

CDMA : IS95-B,C WCDMA
3G : WCDMA / UMTS
GSM : EDGE / GPRS
TDMA : IS136 and EDGE
GAIT : GSM and TDMA
• WLAN
• Wireless PDAs
• Satellite tuners and all other high frequency equipment
• Extreme fine frequency resolution applications

Design support

Application Notes

AN10140_1; 2.5 GHz fractional-N/760 MHz IF integer frequency synthesizer (06-Jun-02)

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