PCM1702UE6

ADCs/DACs - Special Purpose Overview

The PCM1702UE6 is a BiCMOS advanced sign magnitude 20-bit digital-to-analog converter (DAC) manufactured by Texas Instruments. It features ultra-low total harmonic distortion plus noise (THD+N) of –96dB maximum and a typical signal-to-noise ratio (SNR) of 120dB using the A-weighted method. The device operates with a serial input format, supporting clock frequencies up to 20MHz and capable of 16x oversampling rates. It utilizes a ±5V supply voltage range and delivers a fast current output with a settling time of 200ns for a 1.2mA step. The component is housed in a 20-pin Plastic Small Outline Package (SOP).

ADCs/DACs - Special Purpose Feature Summary

• Advanced Sign Magnitude Architecture: Eliminates glitches and nonlinearities around bipolar zero without external adjustments.
• High Dynamic Performance: Achieves –96dB max THD+N and 120dB typical SNR (A-weighted).
• Fast Current Output: Provides ±1.2mA output with a typical settling time of 200ns.
• Oversampling Capability: Supports 16x oversampling rates with a maximum input clock frequency of 20MHz.

ADCs/DACs - Special Purpose Applications

• High-end consumer digital audio applications
• Professional digital audio systems
• Very low distortion frequency synthesis

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific ordering suffix 'UE6' against the official datasheet, which lists standard variants such as PCM1702U and PCM1702P. Confirm RoHS compliance status and ensure the package type matches the 20-pin SOP drawing provided in the documentation. Check for any lifecycle notices regarding obsolescence or replacement recommendations from the manufacturer.

ADCs/DACs - Special Purpose Selection Notes

Select this component for designs requiring high-resolution 20-bit conversion with minimal distortion. Ensure the system supports the required serial data format (MSB first, Binary Two's Complement) and provides a stable ±5V power supply. Verify that the PCB layout allows for proper decoupling capacitor placement near supply pins to maximize power supply rejection and minimize noise pickup.

ADCs/DACs - Special Purpose Part Context

The PCM1702 belongs to the Burr-Brown PCM170 series of precision DACs. It was originally developed by Burr-Brown Corporation before being acquired by Texas Instruments. The device represents an evolution in audio DAC technology by combining conventional R-2R ladder accuracy with noise-shaping benefits through its complementary dual-DAC architecture.

ADCs/DACs - Special Purpose Replacement Considerations

Public confirmed substitute part numbers include PCM1795DB and PCM1795DBR from Texas Instruments. These are listed as similar replacements for discontinued PCM1702 variants. Verify pin compatibility and electrical specifications before substitution.

ADCs/DACs - Special Purpose FAQ

How does the PCM1702 handle bipolar zero transitions?

The PCM1702 uses an advanced sign magnitude architecture that interleaves bits from two complementary DACs. This approach ensures glitch-free operation and ideal linearity around the bipolar zero point without requiring external deglitching circuitry.

What is the maximum input clock frequency for the PCM1702?

The maximum input clock frequency is 20.0 MHz. This supports 16x oversampling of standard audio sample rates, such as 44.1kHz, resulting in a clock rate of approximately 16.9MHz for 24-bit word lengths.

What is the typical settling time of the PCM1702?

The typical settling time is 200ns for a 1.2mA step, measured to within ±0.003% of full scale range.