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AC’97 2.1 FEATURES
Variable Sample Rate
True Line-Level Output
Supports Secondary Codec Modes
AC’97 SoundMAX
®
Codec
AD1881A
ENHANCED FEATURES
Mobile Low Power Mixer Mode
Digital Audio Mixer Mode
Full Duplex Variable 8 kHz to 48 kHz Sampling Rate
with 1 Hz Resolution
PHAT™ Stereo 3D Stereo Enhancement
Split Power Supplies (3.3 V Digital/5 V Analog)
Extended 6-Bit Master Volume Control
Audio Amp Power-Down Signal
AC’97 FEATURES
Designed for AC’97 Analog I/O Component
48-Lead LQFP Package
Multibit
Converter Architecture for Improved
S/N Ratio Greater than 90 dB
16-Bit Stereo Full-Duplex Codec
Four Analog Line-Level Stereo Inputs for Connection
from LINE, CD, VIDEO, and AUX
Two Analog Line-Level Mono Inputs for Speakerphone
and PC BEEP
Mono MIC Input Switchable from Two External
Sources
High Quality CD Input with Ground Sense
Stereo Line-Level Output
Mono Output for Speakerphone or Internal Speaker
Power Management Support
FUNCTIONAL BLOCK DIAGRAM
CS0 CS1
EAPD
MODE
AD1881A
MODE/SYNCHRONIZER
MIC1
MIC2
LINE_IN
0dB/
20dB
CD
VIDEO
PHONE_IN
SELECTOR
AUX
PGA
16-BIT
A/D
CONVERTER
PGA
16-BIT
A/D
CONVERTER
RESET
SYNC
MONO_OUT
MV
G
A
M
G
A
M
G
A
M
G
A
M
G
A
M
G
A
M
AC LINK
SAMPLE
RATE
GENERATORS
BIT_CLK
LNLVL_OUT_L
SDATA_OUT
POP
LINE_OUT_L
MV
D
A
M
PHAT
STEREO
NC
G
A
M
16-BIT
D/A
CONVERTER
SDATA_IN
LINE_OUT_R
MV
POP
PHAT
STEREO
NC
G
A
M
16-BIT
D/A
CONVERTER
LNLVL_OUT_R
A
M
PC_BEEP
G = GAIN
A = ATTENUATE
M = MUTE
MV = MASTER VOLUME
NC = NO CONNECT
OSCILLATORS
XTL_OUT
XTL_IN
SoundMAX is a registered trademark and PHAT is a trademark of Analog Device, Inc.
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2000
AD1881A–SPECIFICATIONS
STANDARD TEST CONDITIONS UNLESS OTHERWISE NOTED
Temperature
Digital Supply (V
DD
)
Analog Supply (V
CC
)
Sample Rate (F
S
)
Input Signal
25
3.3
5.0
48
1008
°C
V
V
kHz
Hz
DAC Test Conditions
Calibrated
–3 dB Attenuation Relative to Full-Scale
Input 0 dB
10 kΩ Output Load
ADC Test Conditions
Calibrated
0 dB Gain
Input –3.0 dB Relative to Full-Scale
ANALOG INPUT
Parameter
Input Voltage (RMS Values Assume Sine Wave Input)
LINE_IN, AUX, CD, VIDEO, PHONE_IN, PC_BEEP
MIC with +20 dB Gain (M20 = 1)
MIC with 0 dB Gain (M20 = 0)
Input Impedance*
Input Capacitance*
MASTER VOLUME
Min
Typ
1
2.83
0.1
0.283
1
2.83
20
5
Max
Unit
V rms
V p-p
V rms
V p-p
V rms
V p-p
kΩ
pF
7.5
Parameter
Step Size (0 dB to –94.5 dB); LINE_OUT_L, LINE_OUT_R
Output Attenuation Range Span*
Step Size (0 dB to –46.5 dB); MONO_OUT
Output Attenuation Range Span*
Mute Attenuation of 0 dB Fundamental*
PROGRAMMABLE GAIN AMPLIFIER—ADC
Min
Typ
1.5
–94.5
1.5
–46.5
Max
Unit
dB
dB
dB
dB
dB
80
Parameter
Step Size (0 dB to 22.5 dB)
PGA Gain Range Span
ANALOG MIXER—INPUT GAIN/AMPLIFIERS/ATTENUATORS
Min
Typ
1.5
22.5
Max
Unit
dB
dB
Parameter
Signal-to-Noise Ratio (SNR)
CD to LINE_OUT
Other to LINE_OUT
Step Size (+12 dB to –34.5 dB): (All Steps Tested)
MIC, LINE_IN, AUX, CD, VIDEO, PHONE_IN, DAC
Input Gain/Attenuation Range: MIC, LINE, AUX, CD, VIDEO, PHONE_IN, DAC
Step Size (0 dB to –45 dB): (All Steps Tested) PC_BEEP
Input Gain/Attenuation Range: PC_BEEP
*Guaranteed,
not tested.
Specifications subject to change without notice.
Min
Typ
90
90
1.5
–46.5
3.0
–45
Max
Unit
dB
dB
dB
dB
dB
dB
–2–
REV. 0
AD1881A
DIGITAL DECIMATION AND INTERPOLATION FILTERS*
Parameter
Passband
Passband Ripple
Transition Band
Stopband
Stopband Rejection
Group Delay
Group Delay Variation Over Passband
ANALOG-TO-DIGITAL CONVERTERS
Min
0
0.4
×
F
S
0.6
×
F
S
–74
Typ
Max
0.4
×
F
S
±
0.09
0.6
×
F
S
Unit
Hz
dB
Hz
Hz
dB
sec
µs
∞
12/F
S
0.0
Parameter
Resolution
Total Harmonic Distortion (THD)
Dynamic Range (–60 dB Input THD+N Referenced to Full Scale, A-Weighted)
Signal-to-Intermodulation Distortion* (CCIF Method)
ADC Crosstalk*
Line Inputs (Input L, Ground R, Read R; Input R, Ground L, Read L)
LINE_IN to Other
Gain Error (Full-Scale Span Relative to Nominal Input Voltage)
Interchannel Gain Mismatch (Difference of Gain Errors)
ADC Offset Error
DIGITAL-TO-ANALOG CONVERTERS
Min
Typ
16
Max
0.02
–74
Unit
Bits
%
dB
dB
dB
dB
dB
%
dB
mV
87
85
–100
–90
–90
–85
±
10
±
0.5
±
10.5
Parameter
Resolution
Total Harmonic Distortion (THD) LINE_OUT, LNLVL_OUT
Dynamic Range (–60 dB Input THD+N Referenced to Full Scale, A-Weighted)
Signal-to-Intermodulation Distortion* (CCIF Method)
Gain Error (Full-Scale Span Relative to Nominal Input Voltage)
Interchannel Gain Mismatch (Difference of Gain Errors)
DAC Crosstalk* (Input L, Zero R, Measure R_OUT; Input R, Zero L,
Measure L_OUT)
Total Audible Out-of-Band Energy (Measured from 0.6
×
F
S
to 20 kHz)*
ANALOG OUTPUT
Min
Typ
16
Max
0.02
–74
Unit
Bits
%
dB
dB
dB
%
dB
dB
dB
90
85
±
10
±
0.7
–80
–40
Parameter
Full-Scale Output Voltage
(LINE_OUT, LNLVL_OUT)
Output Impedance*
External Load Impedance*
Output Capacitance*
External Load Capacitance
V
REF
V
REF_OUT
Mute Click (Muted Output Minus Unmuted Midscale DAC Output)
*Guaranteed,
not tested.
Specifications subject to change without notice.
Min
Typ
1
2.83
Max
Unit
V rms
V p-p
Ω
kΩ
pF
pF
V
V
mV
500
10
15
2.0
2.2
2.2
±
5
100
2.5
REV. 0
–3–
AD1881A–SPECIFICATIONS
STATIC DIGITAL SPECIFICATIONS
Parameter
High Level Input Voltage (V
IH
): Digital Inputs
Low Level Input Voltage (V
IL
)
High Level Output Voltage (V
OH
), I
OH
= –0.5 mA
Low Level Output Voltage (V
OL
), I
OL
= +0.5 mA
Input Leakage Current
Output Leakage Current
POWER SUPPLY
Min
0.65
×
DV
DD
0.9
×
DV
DD
–10
–10
Typ
Max
0.35
×
DV
DD
0.1
×
DV
DD
+10
+10
Unit
V
V
V
V
µA
µA
Parameter
Power Supply Range – Analog
Power Supply Range – Digital (3.3 V)
Power Dissipation – 5 V/3.3 V
Analog Supply Current – 5 V
Digital Supply Current – 3.3 V
Power Supply Rejection (100 mV p-p Signal @ 1 kHz)*
(At Both Analog and Digital Supply Pins, Both ADCs and DACs)
CLOCK SPECIFICATIONS*
Min
4.75
3.0
Typ
Max
5.25
3.6
Unit
V
V
mW
mA
mA
dB
280
40
23
40
Parameter
Input Clock Frequency
Recommended Clock Duty Cycle
POWER-DOWN MODE
Min
45
Typ
Max
Unit
MHz
%
24.576
50
55
Parameter
ADC
DAC
ADC and DAC
ADC + DAC + Mixer (Analog CD On)
Mixer
ADC + Mixer
DAC + Mixer
ADC + DAC + Mixer
Analog CD Only (AC-Link On)
Analog CD Only (AC-Link Off)
Standby
*Guaranteed,
not tested.
Specifications subject to change without notice.
Set Bits
PR0
PR1
PR1, PR0
LPMIX, PR1, PR0
PR2
PR2, PR0
PR2, PR1
PR2, PR1, PR0
LPMIX, PR5, PR1, PR0
LPMIX, PR1, PR0, PR4, PR5
PR5, PR4, PR3, PR2, PR1, PR0
DV
DD
(3.3 V)
Typ
17
17
4
4
20
17
17
4
4
0
0
AV
DD
(5 V)
Typ
30
26
20
12
18
12
8
2
12
12
0.1
Unit
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
–4–
REV. 0
