TRF3750IPW

Clock Generators, PLLs, Frequency Synthesizers Overview

The TRF3750IPW is a high-performance integer-N PLL frequency synthesizer designed for wireless transceiver local oscillators. It covers frequencies up to 2.4 GHz with dual supply ranges of 3 V–3.6 V and 4.5 V–5.5 V, plus a separate charge pump supply (VCP) up to 8 V. Key parameters include a 14-bit R counter, 6-bit A counter, and 13-bit B counter. At 900 MHz with N=4500, phase noise is -91 dBc/Hz at 1 kHz offset. Supply currents are 10 mA (AVDD @ 3.3 V), 3 mA (DVDD @ 3.3 V), and 7.5 mA (VCP @ 7 V). It features a 3-wire serial interface and lock detect outputs.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Supports user-selectable dual-modulus prescaler settings including 8/9, 16/17, 32/33, and 64/65.
• Includes two programmable charge pump current settings for optimized fastlock mode operation.
• Provides multiplexed output access to digital/analog lock detect signals or divided RF/reference clocks.
• Features an anti-backlash pulse function to minimize phase and spurious performance degradation.

Clock Generators, PLLs, Frequency Synthesizers Applications

• Wireless Infrastructure (GSM, IS136, EDGE/UWC-136)
• CDMA Systems (IS95, UMTS, CDMA2000)
• Portable Wireless Communications
• Wireless LAN
• Communication Test Equipment

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific package marking and ordering suffix against the manufacturer's latest datasheet revision SLWS146B. Confirm that the AVDD/DVDD and VCP supply voltages match the design requirements before integration. Ensure ESD handling procedures are followed during installation to prevent damage to the precision integrated circuit.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when designing local oscillators requiring ultra-low phase noise up to 2.4 GHz. The device accommodates various external VCOs via the extended VCP supply range. Consider the available prescaler options and counter bit-widths to ensure the desired frequency step size and output range are achievable within the specified operating temperature range.

Clock Generators, PLLs, Frequency Synthesizers Part Context

The TRF3750IPW belongs to the TRF3750 family of integer-N PLL frequency synthesizers from Texas Instruments. It is packaged in a 16-pin TSSOP Thin Quad FlatPack (PW designator). Other variants in the series include the QFN package version (TRF3750IRGP) and tape-and-reel options (TRF3750IPWR).

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Public confirmed substitute part numbers: TRF3750IPWG4.

Clock Generators, PLLs, Frequency Synthesizers FAQ

How is the maximum charge pump current determined?

The maximum charge pump current is controlled by an external resistor (RSET) connected from the RSET pin to ground. For example, a 4.7-kΩ resistor provides approximately 5 mA.

What are the available prescaler settings?

The device supports four dual-modulus prescaler settings: 8/9, 16/17, 32/33, and 64/65.

How does the Fastlock Mode operate?

Fastlock Mode switches the charge pump to a preprogrammed higher current setting (Setting 2) to speed up locking. It can revert to normal operation either via software control (Mode 1) or after a timer expires (Mode 2).