User guide

2 DS686F1
CS4270
Stand-Alone Mode Feature Set
 System Features
– Master or Slave Serial Audio Interface
– Single-, Double-, or Quad-Speed Operation

D/A Features
– Auto-Mute on Static Samples
– 44.1 kHz 50/15 s 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
– Master or Slave Serial Audio Interface
– Single-, Double-, or Quad-Speed Operation
– Internal Digital Loopback Available

D/A Features
– Selectable Auto-mute
– 44.1-kHz 50/15 s De-emphasis Available
– 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
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 s de-emphasis is available for sam-
pling rates of 44.1 kHz for compatibility with digital audio
programs mastered using the 50/15 s 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 avail-
able 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.
The CS4270 is available in a 24-pin TSSOP package
(-10° to +70° C). The CDB4270 Customer Demonstra-
tion board is also available for device evaluation and
implementation suggestions. Please refer to “Ordering
Information” on page 44 for complete ordering
information.
The CS4270’s wide dynamic range, negligible distor-
tion, and low noise make it ideal for applications such as
DVD recorders, digital televisions, set-top boxes, and
effects processors.