UDA1334BTS/N2,118

Overview

The UDA1334BTS is a low-power stereo digital-to-analog converter (DAC) manufactured by NXP Semiconductors. It integrates a digital filter, noise shaper, and Filter Stream DAC (FSDAC), eliminating the need for external analog post-filtering. The device supports I2S-bus and LSB-justified data formats with word lengths up to 24 bits and sample frequencies from 8 to 100 kHz. Operating on a single supply voltage of 1.8 V to 3.6 V, it features automatic system clock detection, digital de-emphasis at 44.1 kHz, and mute functionality. Available in an SSOP16 package, it is designed for portable audio applications requiring high linearity and wide dynamic range.

Feature Summary

• Integrated digital filter and FSDAC architecture removes requirement for external analog output filters.
• Supports I2S-bus and LSB-justified serial data interfaces with word lengths of 16, 20, or 24 bits.
• Operates within a 1.8 V to 3.6 V power supply range with automatic system clock versus sample rate detection.
• Includes digital de-emphasis for 44.1 kHz sampling rates and programmable mute control.

Applications

• Portable MD players
• MP3 players
• DVD players

Procurement Notes

Verify the specific ordering suffix against current NXP documentation, as product status may have changed since the July 2000 datasheet publication. Confirm availability through authorized distributors, as older component lines may be subject to discontinuation or lifecycle management programs. Ensure the SSOP16 package variant matches the required footprint for the target PCB design.

Selection Notes

Select this component for slave-mode applications where the host processor provides the system clock, bit clock, and word select signals. The device requires a reset capacitor on the Vref(DAC) pin; ensure timing constraints are met during power-up. For capacitive loads exceeding 50 pF, include a series resistance of 100 Ω at the outputs to prevent oscillation. Verify that the input logic levels are compatible with the chosen supply voltage, as 5 V tolerance is limited to supplies between 2.7 V and 3.6 V.

Part Context

The UDA1334BTS belongs to NXP's legacy line of low-power audio DACs, succeeding earlier models like the UDA1320ATS. It utilizes a semi-digital reconstruction filter technique to achieve high signal-to-noise ratios without complex external analog circuitry. The device is part of the broader portfolio of audio solutions designed for battery-operated consumer electronics, emphasizing power efficiency and minimal external component count.

Replacement Considerations

Publicly confirmed direct substitute part numbers are not available in the provided source material. Designers should consult NXP's official obsolescence notices or contact technical support for recommended upgrades or cross-references if this component is discontinued.

FAQ

Does the UDA1334BTS require external analog filtering?

No, the integrated Filter Stream DAC (FSDAC) provides inherent filtering capabilities, eliminating the need for external analog post-filtering components.

What is the maximum supported sampling frequency?

The device supports sampling frequencies ranging from 8 kHz to 100 kHz, depending on the selected clock mode.

How is the Sleep mode activated?

Sleep mode is activated by setting the PCS (Power Control and Sampling Frequency Select) pin to a HIGH logic level, which powers down the DAC.