ESS Technology, Inc. ES1921 AC‘97 Rev 2.1 Audio Codec Product Brief DESCRIPTION FEATURES 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. • Meets or exceeds Audio Codec ‘97, Revision 2.1 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. • PC speaker input • 2 stereo outputs. Line out for multimedia speakers and 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). ESS Technology, Inc. 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 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 (AVDD >= DVDD) Compatibility • Meets Microsoft PC99/PC2001 and WHQL specifications. SAM0353-022001 1 ES1921 PRODUCT BRIEF BLOCK DIAGRAM Figure 1shows the ES1921 block diagram. DVSS DVDD AVDD CD LINE_IN AUX MIC1 MIC2 PHONE AVSS RECORD SOURCE VIDEO PLAYBACK MIXER PREAMP/MIC BOOST ID[1:0] PC_BEEP PCM-out DACs RESET# BIT_CLK SYNC SDATA_IN SDATA_OUT Left 18-BIT DACDAC STEREO Right 18-BIT STEREO DACDAC AFILT[1:0] MONO_OUT 18-BIT ADC Left FILTER FILTER 18-BIT ADC Right AC-LINK MONO VOL CTRL LNLVL PCM-in ADCs VREF VREFOUT MASTER VOL CTRL LINE_OUT REF GEN POWER MGMT MASTER VOL CTRL XTL_IN XTL_OUT EAPD ANTI_POP Figure 1 ES1921 Block Diagram PINOUT AVDD1 AVSS1 VREF VREFOUT AFILT1 AFILT2 CAP1 CAP2 CAP3 ANTI_POP LINE_OUT_L LINE_OUT_R Figure 2 shows the ES1921 pinout diagram. 36 35 34 33 32 31 30 29 28 27 26 25 37 24 LINE_IN_R AVDD2 38 23 LINE_IN_L LNLVL_OUT_L 39 22 MIC2 NC 40 21 MIC1 LNLVL_OUT_R 41 20 CD_R AVSS2 42 19 CD_GND NC 43 18 CD_L 17 VIDEO_R MONO_OUT ES1921S 48-PIN LQFP 14 AUX_L NC 48 13 PHONE 4 5 6 7 8 9 10 11 12 PC_BEEP 3 RESET# 2 SYNC 1 DVDD2 47 SDATA_IN AUX_R EAPD DVSS2 15 BIT_CLK 46 SDATA_OUT VIDEO_L ID1 DVSS1 16 XTL_OUT 45 DVDD1 44 ID0 XTL_IN NC Figure 2 ES1921 48-Pin Pinout Diagram 2 SAM0353-022001 ESS Technology, Inc. ES1921 PRODUCT BRIEF ES1921 PIN DESCRIPTIONS Table 1lists the ES1921pin descriptions. Table 1 ES1921 Pin Descriptions Names Pin Numbers I/O DVDD1 1 P Digital VDD. XTL_IN 2 I Oscillator input (24.576 MHz). XTL_OUT 3 I Oscillator output. DVSS1 4 G Digital ground. SDATA_OUT 5 I AC‘97 Serial data in. BIT_CLK 6 O Serial data clock (12.288 MHz). DVSS2 7 G Digital ground. SDATA_IN 8 O AC‘97 Serial data ou.t DVDD2 9 P Digital VDD. SYNC 10 I Fixed-rate sample sync (48 kHz). RESET # 11 I Hardware reset. PC_BEEP 12 I PC speaker out. PHONE 13 I Telephone speaker input. AUX_L 14 I Aux left channel input. AUX_R 15 I Aux right channel input. VIDEO_L 16 I Video left channel input. VIDEO_R 17 I Video right channel input. CD_L 18 I CD left channel input. CD_GND 19 I CD ground. CD_R 20 I CD right channel input. MIC1 21 I First microphone input. MIC2 22 I Second microphone input. LINE_IN_L 23 I Line-in left channel input. LINE_IN_R 24 I Line-in right channel input. AVDD1 25 P Analog VDD. AVSS1 26 G Analog ground. VREF 27 I DAC reference voltage filter capacitor. VREFOUT 28 O Mic reference voltage output (2.5V, 1.25 mA). AFILT1 29 O Anti-Aliasing filter cap (ADC channel). AFILT2 30 O Anti-Aliasing filter cap (ADC channel). CAP1 31 O Analog output holdoff delay. CAP2 32 O ADC reference capacitor. ESS Technology, Inc. Descriptions SAM0353-022001 3 ES1921 PRODUCT BRIEF Table 1 ES1921 Pin Descriptions (Continued) Names Pin Numbers I/O Descriptions CAP3 33 O Antipop power sustain delay. ANTI_POP 34 O Antipop output ground shunt control. LINE_OUT_L 35 O Line out left channel. LINE_OUT_R 36 O Line out right channel. MONO_OUT 37 O Mono out. AVDD2 38 P Analog VDD. LNLVL_OUT_L 39 O True-line level-output left channel. NC 40 NC LNLVL_OUT_R 41 O True-line level-output right channel. AVSS2 42 G Analog ground. NC 43, 44, 48 NC ID0 45 I Multi-Codec ID select (bit 0). ID1 46 I Multi-Codec ID select (bit 1). EAPD 47 O External amplifier power down. No connect. No connect. ORDERING INFORMATION Description Part Number ES1921S Audio Codec ESS Technology, Inc. 48401 Fremont Blvd. Fremont, CA 94538 Tel: (510) 492-1088 Fax: (510) 492-1898 4 © 2001 ESS Technology, Inc. Package 48-pin LQFP No part of this publication may be reproduced, stored in a retrieval system, transmitted, or translated in any form or by any means, electronic, mechanical, manual, optical, or otherwise, without the prior written permission of ESS Technology, Inc. ESS Technology, Inc. assumes no responsibility for any errors contained herein. ESS Technology, Inc. makes no representations or warranties regarding the content of this document. All other trademarks are owned by their respective holders and are used for identification purposes only. (P) U.S. patents pending. Maestro is a trademark of ESS Technology, Inc. All specifications are subject to change without prior notice. SAM0353-022001