ESS ES1921S Datasheet
ESS Technology, Inc. SAM0353-022001 1
ESS Technology, Inc.
ES1921
AC‘97 Rev 2.1 Audio Codec
Product Brief
DESCRIPTION
The ES1921 audio codec is a combination codec and
audio mixer device that is fully compliant with Revision 2.1
of Intel’s Audio Codec ‘97 (AC‘97) Component
Specification. When used with the ESS Technology
Maestro™ family of peripheral component interconnect
(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. 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 downline
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 time division multiplexed (TDM)based serial AC-Link to transfer data between itself and a
digital audio accelerator, such as the ESS Technology
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 industrystandard 48-pin low-profile quad flat pack (LQFP).
FEATURES
• Meets or exceeds Audio Codec ‘97, Revision 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 microphones sharing a
single mixer input and 1 mono input for phone
• PC speaker input
• 2 stereo outputs. Line out for multimedia speakers and
true line out for consumer audio applications
• Usable in desktop, motherboard, and notebook sound
card applications, 3D audio applications, and in audiomodem 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
• 3.3V digital and 5.0V analog power supply (AV
DD
>=
DVDD)
Compatibility
• Meets Microsoft PC99/PC2001 and WHQL
specifications.
2 SAM0353-022001 ESS Technology, Inc.
ES1921 PRODUCT BRIEF
BLOCK DIAGRAM
Figure 1shows the ES1921 block diagram.
Figure 1 ES1921 Block Diagram
PINOUT
Figure 2 shows the ES1921 pinout diagram.
Figure 2 ES1921 48-Pin Pinout Diagram
LINE_OUT
LINE_IN
AV
DD
AV
SS
MIC2
CD
RESET#
XTL_IN XTL_OUT
REF GEN
VIDEO
DV
DD
DV
SS
AUX
AFILT[1:0]
PREAMP/MIC BOOST
MIC1
RECORD
SOURCE
PLAYBACK
MIXER
SDATA_IN
BIT_CLK
SYNC
AC-LINK
SDATA_OUT
MONO_OUT
PHONE
PC_BEEP
V
REF
V
REF
OUT
ID[1:0]
LNLVL
MASTER
VOL
CTRL
MASTER
VOL
CTRL
MONO
VOL
CTRL
Left
Right
Left
Right
EAPD
STEREO DAC
18-BIT
FILTER
ADC
18-BIT
FILTER
ADC
18-BIT
STEREO DAC
18-BIT
DAC
DAC
ANTI_POP
PCM-out DACs
PCM-in ADCs
POWER MGMT
ES1921S
1
MONO_OUT
AV
DD
2
LNLVL_OUT_L
NC
LNLVL_OUT_R
AV
SS
2
NC
NC
ID0
ID1
EAPD
NC
DV
DD
1
XTL_IN
XTL_OUT
DV
SS
1
SDATA_OUT
BIT_CLK
DV
SS
2
SDATA_IN
DV
DD
2
SYNC
RESET#
PC_BEEP
LINE_OUT_R
LINE_OUT_L
ANTI_POP
CAP3
CAP2
CAP1
AFILT2
AFILT1
V
REF
OUT
V
REF
AV
SS
1
AV
DD
1
LINE_IN_R
LINE_IN_L
MIC2
MIC1
CD_R
CD_GND
CD_L
VIDEO_R
VIDEO_L
AUX_R
AUX_L
PHONE
2 3 4 5 6 7 8 9 10 11
14
23
22
21
20
19
18
17
16
15
24
252627282930313233343536
37
38
39
40
41
42
43
44
45
46
47
48
13
12
48-PIN LQFP
Loading...