UMA1021M

General description

The UMA1021M BICMOS device integrates a prescaler, programmable dividers, and a phase comparator to implement a phase-locked loop.

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 RF input frequencies up to 2.2 GHz, with 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 (charge-pump) and digital circuits. The ground leads should be externally short-circuited to prevent large currents flowing across the die and thus causing damage. V_DD1 and V_DD2 must also be at the same potential (V_DD). V_CC must be equal to or greater than V_DD (e.g. V_DD =3 V and V_CC = 5 V for wider VCO control voltage range).

The phase detector has two charge-pump outputs, CP and CPF, the latter of which is enabled directly at pin FAST. This permits the design of adaptive loops. The charge pump currents (phase detector gain) are fixed by an external resistance at pin I_SET and via the serial interface. Only a passive loop filter is necessary; the charge pumps function within a wide voltage compliance range to improve the overall system performance.

Features

• Low phase noise
• Low current from 3 V supply
• Fully programmable main divider
• 3-line serial interface bus
• Independent fully programmable reference divider,
  driven from external crystal oscillator
• Dual charge pump outputs
• Hard and soft power-down control.

Applications

• 900 MHz and 2 GHz mobile telephones
• Portable battery-powered radio equipment.

Block diagrams/pinning

Design support

Application Notes

AN96083; UMA1021M Low Voltage Frequency Synthesizer (12-Aug-96)

Support Documents

IC17_98_GSM_1; GSM Digital cellular ICs Introduction (1997-12-01)

75009895; I2C Bus Solutions - Industrial/Motor Control Applications: Numeric Control Machine (2002-06-01)

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