ES1921 Datasheet, PDF (1/4 Pages) List of Unclassifed Manufacturers – AC 97 Rev 2.1 Audio CODEC

ES1921
AC ‘97 Rev 2.1 Audio CODEC
Data Sheet
DESCRIPTION
The ES1921 audio codec is a combination codec and
audio mixer device that is fully compliant with Rev. 2.1 of
Intel’s Audio Codec’ 97 (AC’97) Component Specification.
When used with the ESS Maestro™ family of PCI-based
digital audio accelerators, the ES1921 helps complete a
superior high-performance PCI audio subsystem solution
for both desktop and notebook computers.
The ES1921 audio codec supports full-duplex stereo
operation for simultaneous record and playback. Voice,
sound, and music are regularly sampled for record and
playback at 48 kHz. The playback mixer has four stereo
inputs and two mono inputs. The record multiplexer has
five stereo inputs and three mono inputs, while the mixer
includes three outputs. Line Out can be used for stereo
output to multimedia speakers while Mono Out can be
used to output to a telephony subsystem or down-line
phone.
The major functions of the ES1921 include stereo 18-bit
ADC and DAC audio signal conversion while also
providing the interface and control logic to transfer audio
data between its serial I/O terminals and the digital audio
accelerator. The ES1921 uses its six line-level inputs, its
three outputs and the TDM-based serial AC-Link to
transfer data between itself and a digital audio accelerator,
such as the ESS Maestro™ family of PCI-based digital
audio accelerators.
The ES1921 may be used as a primary or secondary
CODEC in multiple codec configurations conforming to the
AC'97 Rev. 2.1 specification. The ES1921’s conformance
to AC’97 in multiple codec configurations allows it to be
used both in 2- and 4-speaker audio-only solutions and in
audio-modem solutions for motherboards, add-on cards,
or PCMCIA cards. The ES1921 is available in an industry-
standard 48-pin Thin Quad Flat Pack (TQFP).
FEATURES
• Meets or exceeds Audio CODEC ’97 Rev. 2.1
performance specifications
• Supports dual-codec architecture for configuration with
one ES1921 in notebook and one in docking station
• Supports AC-Link digital serial interface
• 4 stereo inputs for line-in, CD, video, and auxiliary line-in
• 2 selectable mono inputs for microphone sharing a single
mixer input and 1 mono input for phone
• PC speaker input
• 2 stereo outputs for line-out such as multimedia speakers
and DVD Pure Audio
• Usable in desktop, motherboard, notebook and sound
card applications, 3D audio applications and in audio-
modem applications
Record and Playback Features
• Full-duplex stereo operation for simultaneous record and
playback
• 18-bit stereo ADC and DAC; 3rd 18-bit ADC for mic input
• 48 kHz playback and record sample rate
Power
• Advanced Configuration and Power Interface (ACPI)
support using an external amplifier power down control
• 3.3 V or 5.0 V digital and 5.0 V analog power supply
(AV_DD >= DV_DD)
Compatibility
• Meets Microsoft PC99 specifications for Baseline and
Advanced Audio with FAQ updates and with Rev. 2.1 of
Intel’s Audio CODEC ’97 specification
BLOCK DIAGRAM
ES1921
SYNC
BIT_CLK
RESET#
SDATA_OUT
SDATA_IN
L
DAC
R
AC-Link
Interface and
Register Set
DAC
L
ADC
R
ADC
Mixer
Analog Mixing
and
Volume Control
+20 dB
Mono Out
True Line Out
Line Out
PC Beep
Phone
Line
CD
Video
Aux
Mux
Mic1
Mic2
ESS Technology, Inc.
SAM0353-042100
1