General Description

The CS4270 is a high-performance, integrated audio CODEC. The CS4270 performs stereo analog-to-digital (A/D) and digital-to-analog (D/A) conversion of up to 24-bit serial values at sample rates up to 216 kHz. Standard 50/15 µs de-emphasis is available for sampling rates of 44.1 kHz for compatibility with digital audio programs mastered using the 50/15 µs pre-emphasis technique.

Integrated level translators allow easy interfacing be tween the CS4270 and other devices operating over a wide range of logic levels.

Independently addressable high-pass filters are available for the right and left channel of the A/D. This allows the A/D to be used in a wide variety of applications where one audio channel and one DC measurement channel is desired.

D/A Features

♦ High Performance

   – 105 dB Dynamic Range

   – -95 dB THD+N

♦ Selectable Serial Audio Interface Formats

   – Left-Justified up to 24-bit

   – I²S up to 24-bit

   – Right-Justified 16-, and 24-Bit

♦ Control Output for External Muting

♦ On-Chip Digital De-Emphasis

♦ Popguard® Technology

♦ Multi-bit ∆Σ Conversion

♦ Digital Volume Control

♦ Single-Ended Output

A/D Features

♦ High Performance

   – 105 dB Dynamic Range

   – -95 dB THD+N

♦ Multi-bit ∆Σ Conversion

♦ High-Pass Filter to Remove DC Offsets

♦ Selectable Serial Audio Interface Formats

   – Left-Justified up to 24-bit

   – I²S up to 24-bit

♦ Single-Ended Input

System Features

♦ Direct Interface with Logic Levels 1.8 V to 5 V

♦ Internal Digital Loopback

♦ Stand-Alone or Control Port Functionality

♦ Single-Ended Analog Architecture

♦ Supports all Audio Sample Rates from 4 kHz to 216 kHz

♦ 3.3 V or 5 V Core Supply

Stand-Alone Mode Feature Set

♦ System Features

   – Serial Audio Port Master or Slave Operation

   – Single-, Double-, or Quad-Speed Operation

♦ D/A Features

   – Auto-Mute on Static Samples

   – 44.1 kHz 50/15 µs De-emphasis Available

   – Selectable Serial Audio Interface Formats

      • Left-Justified up to 24-bit

      • I²S up to 24-bit

♦ A/D Features

   – High-Pass Filter

   – Selectable Serial Audio Interface Formats

      • Left-Justified up to 24-bit

      • I²S up to 24-bit

Software Mode Feature Set

♦ System Features

   – Serial Audio Port Master or Slave Operation

   – Internal Digital Loopback Available

♦ D/A Features

   – Selectable Auto-mute

   – 44.1-kHz De-emphasis Filters

   – Configurable Muting Controls

   – Volume Control

   – Selectable Serial Audio Interface Formats

      • Left-Justified up to 24-bit

      • I²S up to 24-bit

      • Right-Justified 16, and 24-bit

♦ A/D Features

   – Selectable High-Pass Filter or DC Offset Calibration

   – Selectable Serial Audio Interface Formats

      • Left-Justified up to 24-bit

      • I²S up to 24-bit