SN761634RTWR

Overview

The SN761634 is a single-chip FM stereo transmitter IC designed for portable audio applications. It operates on a supply voltage of 2.5 V to 4 V and supports a transmit frequency range from 76 MHz to 108 MHz. The device features selectable I2C or parallel control modes, integrated crystal oscillator support with a 32.768-kHz clock, and a fourth-order 15-kHz low-pass filter. It offers four selectable high-power output levels: -7, -3, 1, and 4 dBm. The component is housed in a 24-pin Quad Flatpack No Lead (QFN) package measuring 4 × 4 mm.

Feature Summary

• Integrates an FM stereo transmitter with selectable I2C and parallel control interfaces
• Supports transmit frequencies ranging from 76 MHz to 108 MHz
• Features four selectable RF power output levels for flexible antenna matching
• Includes a built-in fourth-order 15-kHz low-pass filter

Applications

• Portable Audio Players
• MP3 Players
• Personal Navigation Devices (PNDs)
• Portable Media Players (PMPs)

Procurement Notes

Verify the current production status before design implementation, as the SN761634RTWR may be classified as obsolete by Texas Instruments. Confirm availability through authorized distributors and check for recommended replacement components if new designs are required. Ensure compliance with RoHS standards and verify that the specific RTW package variant matches the intended PCB footprint requirements.

Selection Notes

Select this component for battery-powered devices requiring compact FM transmission capabilities. The choice between I2C and parallel modes depends on system interface constraints and pin availability. Consider the required output power level when designing the antenna matching network, as different power settings necessitate specific pull-up resistors at the TX_OUT pin to maintain impedance matching and signal integrity.

Part Context

This part belongs to the SN761634 family of FM stereo transmitters manufactured by Texas Instruments. It is specifically engineered for integration into consumer electronics where space and power consumption are critical factors. The device consolidates transmitter functions, including modulation and filtering, into a single small-footprint package suitable for handheld mobile devices.

Replacement Considerations

Check Texas Instruments documentation for officially designated substitute part numbers if the SN761634RTWR is unavailable. Verify functional compatibility regarding pinout, control protocols, and electrical specifications before transitioning to alternative components.