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AD1980 Analog Devices Data Sheet manual specifications

Summary

This advanced audio codec chip is designed for building sophisticated home theater and professional audio systems. It delivers robust 5.1 surround sound capability with AC’97 compatibility and features high dynamic range DACs (20-bit PCM) and flexible analog inputs including mic preamps, CD sources, and AUX lines. The associated documentation provides comprehensive schematics and detailed specifications covering ADC/DAC performance, power management modes, frequency ranges (up to 96 kHz), and advanced signal processing controls like parametric equalization. Ideal for system architects and electronics manufacturers developing high-fidelity audio products.

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AC ’97 Sound MAX® Codec

AD1980

FEATURES ENHANCED FEATURES AC ’97 2.3 COMPATIBLE FEATURES Integrated Parametric Equalizer 6 DAC Channels for 5.1 Surround Stereo MIC Preamp Support S/PDIF Output Integrated PLL for System Clocking Integrated Stereo Headphone Amplifier Variable Sample Rate 7 k Hz to 96 k Hz Variable Rate Audio Jack Sense (Auto Topology Switching) 2C IC Double Rate Audio (f S = 96 k Hz) Software Controlled VREF_OUT for MIC Bias Greater than 90 d B Dynamic Range Software Enabled Outputs for Jack Sharing 20-Bit PCM DACs Auto Down-Mix and Channel Spreading Modes Line-Level Mono ”Phone” Input High Quality CD Input Selectable MIC Input with Preamp AUX and Line_In Stereo Inputs External Amplifier Power-Down Control Power Management Modes 48-Lead LQFP Package

FUNCTIONAL BLOCK DIAGRAM

VREFOUT VREF XTL_OUT XTL_IN SPDIF

AD1980 VOLTAGE

MIC PREAMP REFERENCE

MC1 SPDIF TX

CODEC CORE

PCM L/R PHONE_IN ADC RATE PLL

16-BIT

CD MG

CD_GND - ADC

DIFF AMP PA PA

16-BIT

MG ID1

AUX_L - ADC

AUX_R LINE_IN_L

PCM LFE

LINE_IN_R RESET

DAC RATE

20-BIT

- DAC

MZ LOGIC

ALFE_OUT

20-BIT - DAC

MZ ACENTER_OUT

'9 IN FA G = GAIN BITCLK

A = ATTENUATION GA GA GA GA M = MUTE Z = HIGH Z

GA GA GA GA

PCM FRONT SDATA_OUT

MZ ALINE_OUT_L DAC RATE

MZ AMONO_OUT SDATA_IN

20-BIT

MZ ALINE_OUT_R

- DAC

EQ20-BIT

- DAC

HP ASURR_OUT_L/

HP_OUT_L AC '97

20-BIT CONTROL - DAC REGISTERS

HP ASURR_OUT_R/

20-BIT

HP_OUT_R

- DAC

PCM SURR EAPDANALOG MIXING

CONTROL LOGIC

DAC RATE

JS0 JS1 EAPD

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Page Summary Contents For AD1980 Analog Devices Data Sheet manual specifications

Page 1 AC ’97 Sound MAX® Codec AD1980 FEATURES ENHANCED FEATURES AC ’97 2.3 COMPATIBLE FEATURES Integrated Parametric Equalizer 6 DAC Channels for 5.1 Surround Stereo MIC Preamp Support S/PDIF Output Integra...
Page 2 AD1980–SPECIFICATIONS STANDARD TEST CONDITIONS, UNLESS OTHERWISE DAC Test Conditions NOTED Calibrated Temperature 25°C –3 d B Attenuation Relative to Full Scale Digital Supply (DVDD) 3.3 V 0 d B Input...
Page 3 AD1980 Parameter Min Typ Max Unit ANALOG-TO-DIGITAL CONVERTERS Resolution Bits Total Harmonic Distortion (THD) AVDD = 5.0 V –78 d B Dynamic Range (–60 d B Input THD + N Referenced to FS, A-Weighted) d...
Page 4 AD1980 Parameter PR[K:I]1 PR[6:0]1 DVDD Typ AVDD Typ Unit POWER-DOWN STATES2 Fully Active 000 0000 m A ADC 000 0001 m A FRONT DAC 000 0010 m A SURROUND DAC 000 0000 m A CENTER/LFE DAC 000 0000 m A ADC...
Page 5 AD1980 t RST2CLK t RST_LOW RESET t TRI2ACTV BIT_CLK t TRI2ACTV SDATA_IN Figure 1. Cold Reset Timing (Codec is Supplying the Bit_CLK Signal) t SYNC_HIGH t SYNC2CLK BIT_CLK Figure 2. Warm Reset Timing t...
Page 6 AD1980 ABSOLUTE MAXIMUM RATINGS* ENVIRONMENTAL CONDITIONS* Ambient Temperature Rating Parameter Min Max Unit TCASE = Case Temperature in °C Power Supplies PD = Power Dissipation in W Digital (DVDD) –0...
Page 7 AD1980 PIN FUNCTION DESCRIPTIONS Pin Number Mnemonic I/O Function DIGITAL INPUT/OUTPUT XTL_IN Crystal Input (24.576 MHz) or External Clock In (24.576 MHz, 14.31818 MHz or 48000 MHz) XTL_OUT Crystal Ou...
Page 8 AD1980 Pin Number Mnemonic I/O Function POWER AND GROUND SIGNALS DVDD1 Digital VDD 3.3 V DVSS1 Digital GND DVSS2 Digital GND DVDD2 Digital VDD 3.3 V AVDD1 Analog VDD 5.0 V AVSS1 Analog GND AVSS4 Analo...
Page 9 AD1980 Indexed Control Registers Reg Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default 00h Reset SE4 SE3 SE2 SE1 SE0 ID9 ID8 ID7 ID6 ID5 ID4 ID3 ID2 ID1 ID0 0090h 02h Master Volume MM...
Page 10 AD1980 Reset Register (Index 00h) Reg No. Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default 00h Reset SE4 SE3 SE2 SE1 SE0 ID9 ID8 ID7 ID6 ID5 ID4 ID3 ID2 ID1 ID0 0090h NOTES All regis...
Page 11 AD1980 Headphones Volume Register (Index 04h) Reg No. Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default 04h Headphones HPM X LHV5 LHV4 LHV3 LHV2 LHV1 LHV0 HPRM* X RHV5 RHV4 RHV3 RHV2 ...
Page 12 AD1980 Phone_in Volume Register (Index 0Ch) Reg No. Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default 0Ch Phone_in Volume PHM PHV4 PHV3 PHV2 PHV1 PHV0 8008h All registers not shown an...
Page 13 AD1980 Line-In Volume Register (Index 10h) Reg No. Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default 10h Line-In Volume LVM LLV4 LLV3 LLV2 LLV1 LLV0 LVRM* RLV4 RLV3 RLV2 RLV1 RLV0 880...
Page 14 AD1980 PCM-Out Volume Register (Index 18h) Reg No. Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default 18h PCM Out Volume OM LOV4 LOV3 LOV2 LOV1 LOV0 OMRM* ROV4 ROV3 ROV2 ROV1 ROV0 8808...
Page 15 AD1980 Table V. Settings for Record Select Control LS [10:8] Left Record Source RS [2:0] Right Record Source MIC MIC CD_L CD_R Muted Muted AUX_L AUX_R LINE_IN_L LINE_IN_R Stereo Mix (L) Stereo Mix (R)...
Page 16 AD1980 General-Purpose Register (Index 20h) Reg No. Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default 20h General-Purpose DRSS1 DRSS0 MS LPBK 0000h This register should be read before...
Page 17 AD1980 Power-Down Control/Status Register (Index 26h) Reg No. Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default 26h Power-Down EAPD PR6 PR5 PR4 PR3 PR2 PR1 PR0 REF ANL DAC ADC NA Cont...
Page 18 AD1980 PR0 = 1 PR1 = 1 PR2 = 1 PR4 = 1 ANALOG DIGITAL I/F NORMAL ADCs OFF DACs OFF OFF SHUT OFF PR0 PR1 PR2 OR AC-LINK PR0 = 0 PR1 = 0 PR2 = 0 AND AND AND WARM ADC = 1 DAC = 1 ANL = 1 RESET READY = 1 ...
Page 19 AD1980 Extended Audio Status and Control Register (Index 2Ah) Reg No. Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default 2Ah Extended Audio VFORCE PRK PRJ PRI SPCV ELDAC ESDAC ECDAC SP...
Page 20 AD1980 AC ’97 2.2 AMAP Compliant Default SPDIF Slot Assignments Codec ID Function SPSA = 00 SPSA = 01 SPSA = 10 SPSA = 11 2-Ch Primary w/SPDIF 3 and 4 7 and 8 [default] 6 and 9 10 and 11 4-Ch Primary ...
Page 21 AD1980 CENTER/LFE Volume Control Register (Index 36h) Reg No. Name D15 D14 D13* D12 D11 D10 D9 D8 D7 D6 D5* D4 D3 D2 D1 D0 Default 36h Center/LFE LM LFE5 LFE4 LFE3 LFE2 LFE1 LFE0 CM CNT5 CNT4 CNT3 CNT...
Page 22 AD1980 Table VIII. Settings for Surround Register Control Bits Surround Volume (38h) Left Surround D[13:8] Right Surround D[5:0] D15/D7 Function with AC97NC = 0 Function with AC97NC = 1 WRITE READBACK...
Page 23 AD1980 EQ Control Register (Index 60h) Reg No. Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default 60h EQ CTRL EQM SYM CHS BCA5 BCA4 BCA3 BCA2 BCA1 BCA0 8080h All registers not shown, a...
Page 24 AD1980 EQ Data Register (Index 62h) Reg No. Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default 62h EQ DATA CFD15 CFD14 CFD13 CFD12 CFD11 CFD10 CFD9 CFD8 CFD7 CFD6 CFD5 CFD4 CFD3 CFD2 C...
Page 25 AD1980 Table IX. Jack Sense Mute Select (JSMT [2:0]) HP LINE C/LFE MONO REF JS1 JS0 JSMT2 JSMT1 JSMT0 OUT OUT OUT OUT NOTES OUT (0) OUT (0) ACTIVE ACTIVE ACTIVE ACTIVE JS0 and JS1 ignored OUT (0) IN (...
Page 26 AD1980 Serial Configuration Register (Index 74h) Reg No. Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default 74h Serial SLOT16 REGM2 REGM1 REGM0 REGM3 DRF CHEN X LBKS1 LBKS0 INTS SPAL S...
Page 27 AD1980 Miscellaneous Control Bit Register (Index 76h) Reg De- No. Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 fault 76th Misc DACZ AC97NC MSPLT LODIS CLDIS HPSEL DMIX1 DMIX0 SPRD 2CMIC ...
Page 28 AD1980 DMIX[1:0] Down Mix Mode Select. Provides analog down-mixing of the center, LFE, and/or surround channels into the mixer channels. This allows the full content of 5.1 or quad media to be played ...
Page 29 AD1980 Vendor ID Register (Index 7Ch–7Eh) Reg No. Name D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default 7Ch Vendor ID1 F7 F6 F5 F4 F3 F2 F1 F0 S7 S6 S5 S4 S3 S2 S1 S0 4144h S[7:0] This re...
Page 30 AD1980 OUTLINE DIMENSIONS 48-Lead Plastic Quad Flatpack [LQFP] 1.4 mm Thick (ST-48) Dimensions shown in millimeters 1.60 MAX PIN 1 0.75 INDICATOR 9.00 BSC SEATING 1.45 PLANE 0.20 TOP VIEW 7.00 0.09 (P...
Page 32 IN IN .S .A 1– 0– /0 2( 0)

Manual Details

Brand Analog Devices
Pages 32
File Size 1.27 MB
Published June 16, 2026
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Frequently Asked Questions

Does the device fully support surround sound?

Yes, it features 5.1 Surround Stereo DAC channels and supports Auto Down-Mix and Channel Spreading modes.

What are the resolution capabilities of the converters?

The ADCs have a 16-bit resolution, while the DACs provide a higher resolution of 20 bits.

What types of audio inputs can be connected?

Inputs include LINE_IN Stereo, CD Input, AUX, dedicated PHONE_IN, and two selectable MIC Inputs.

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