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AC’97 2.1 FEATURES
Variable Sample Rate Audio
Multiple Codec Configuration Options
External Audio Power-Down Control
AC’97 SoundMAX
®
Codec
AD1885
ENHANCED FEATURES
Full Duplex Variable Sample Rates from 7040 Hz to
48 kHz with 1 Hz Resolution
Jack Sense Pins Provide Automatic Output Switching
Software-Enabled V
REFOUT
Output for Microphones and
External Power Amp
Split Power Supplies (3.3 V Digital/5 V Analog)
Mobile Low-Power Mixer Mode
Extended 6-Bit Master Volume Control
Extended 6-Bit Headphone Volume Control
Digital Audio Mixer Mode
PHAT™ Stereo 3D Stereo Enhancement
AC’97 FEATURES
AC’97 2.1-Compliant
Greater than 90 dB Dynamic Range
Stereo Headphone Amplifier
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:
LINE-IN, CD, VIDEO, and AUX
Two Analog Line-Level Mono Inputs for Speakerphone
and PC BEEP
Mono MIC Input w/Built-In 20 dB Preamp, Switchable
from Two External Sources
High Quality CD Input with Ground Sense
Stereo Line-Level Outputs
Mono Output for Speakerphone or Internal Speaker
Power Management Support
48-Terminal LQFP Package
FUNCTIONAL BLOCK DIAGRAM
ID0
ID1
JS0/EAPD
JS1
AD1885
CHIP SELECT
MIC1
MIC2
LINE
SELECTOR
JACK SENSES
AND EAPD CTRL
V
REF
V
REFOUT
0dB/
20dB
AUX
CD
VIDEO
PHONE_IN
PGA
16-BIT
A/D
CONVERTER
PGA
16-BIT
A/D
CONVERTER
RESET
SYNC
MONO_OUT
MMV
G
A
M
POP
PHAT
STEREO
NC
G
A
M
16-BIT
D/A
CONVERTER
G
A
M
G
A
M
G
A
M
G
A
M
G
A
M
AC LINK
SAMPLE
RATE
GENERATORS
BIT_CLK
HP_OUT_L
HV
SDATA_OUT
LINE_OUT_L
MV
SDATA_IN
LINE_OUT_R
MV
POP
PHAT
STEREO
G = GAIN
A = ATTENUATE
M = MUTE
MV = MASTER VOLUME
HV = HEADPHONE VOLUME
NC
A
M
G
A
M
16-BIT
D/A
CONVERTER
HP_OUT_R
HV
OSCILLATOR
PC_BEEP
XTL_OUT XTL_IN
SoundPort is a registered trademark and PHAT is a trademark of Analog Devices, 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
AD1885–SPECIFICATIONS
STANDARD TEST CONDITIONS UNLESS OTHERWISE NOTED
Temperature
Digital Supply (DV
DD
)
Analog Supply (AV
DD
)
Sample Rate (F
S
)
Input Signal
Analog Output Passband
25
°C
3.3
V
5.0
V
48
kHz
1008
Hz
20 Hz to 20 kHz
DAC Test Conditions
Calibrated
–3 dB Attenuation Relative to Full Scale
Input 0 dB
10 kΩ Output Load (LINE_OUT)
32
Ω
Output Load (HP_OUT)
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*
Step Size (+6 dB to –88.5 dB); HP_OUT_R, HP_OUT_L
Output Attenuation Range Span*
Mute Attenuation of 0 dB Fundamental*
PROGRAMMABLE GAIN AMPLIFIER—ADC
Min
Typ
1.5
–94.5
1.5
–46.5
1.5
–94.5
Max
Unit
dB
dB
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.
Min
Typ
90
90
1.5
–46.5
3.0
–45
Max
Unit
dB
dB
dB
dB
dB
dB
–2–
REV. 0
AD1885
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
∞
12/F
S
0.0
Unit
Hz
dB
Hz
Hz
dB
sec
µs
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
–84
87
85
–100
–90
Max
Unit
Bits
dB
dB
dB
84
–90
–85
±
10
±
0.5
±
5
dB
dB
%
dB
mV
Parameter
Resolution
Total Harmonic Distortion (THD) LINE_OUT
Total Harmonic Distortion (THD) HP_OUT (With 10 kΩ Load)
Dynamic Range LINE_OUT (–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
–85
–75
Max
Unit
Bits
dB
dB
dB
dB
%
dB
dB
dB
85
90
–100
±
10
±
0.7
–80
–40
Parameter
Full-Scale Output Voltage; LINE_OUT
Output Impedance*
External Load Impedance*
Output Capacitance*
External Load Capacitance
Full-Scale Output Voltage; HP_OUT (0 dB Gain)
Output Capacitance*
External Load Capacitance
V
REF
V
REFOUT
V
REFOUT
Current Drive
Mute Click (Muted Output Minus Unmuted Midscale DAC Output)
*Guaranteed,
not tested.
Min
Typ
1
2.83
Max
Unit
V rms
V p-p
Ω
kΩ
pF
pF
V rms
pF
Ω
V
V
mA
mV
800
10
15
100
1
100
32
2.45
5
±
5
2.05
2.25
2.25
REV. 0
–3–
AD1885–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
= 2 mA
Low-Level Output Voltage (V
OL
), I
OL
= 2 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 (AV
DD
)
Power Supply Range—Digital (DV
DD
)
Power Dissipation—5 V/3.3 V
Analog Supply Current—5 V (AV
DD
)
Digital Supply Current—3.3 V (DV
DD
)
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
3.15
Typ
Max
5.25
3.45
Unit
V
V
mW
mA
mA
dB
355
50
21
40
Parameter
Input Clock Frequency
Recommended Clock Duty Cycle
POWER-DOWN MODE*
Min
40
Typ
24.576
50
Max
60
Unit
MHz
%
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
Headphone Standby
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
PR6
DV
DD
(3.3 V)
Typ
20
20
8
8
21
19
19
8
7
0
0
21
AV
DD
(5 V)
Typ
44
41
35
26
23
18
15
10
22
12
0.1
38
Unit
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
NOTES
*Guaranteed,
not tested.
Output jitter is directly dependent on crystal input jitter.
Specifications subject to change without notice.
–4–
REV. 0
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