Analog Devices AD1887 Datasheet
a
ID0 ID1
AC’97 SoundMAX® Codec
AD1887
AC’97 2.1 FEATURES
Variable Sample Rate Audio
AC’97 FEATURES
AC’97 2.2 Compliant
Greater than 90 dB Dynamic Range
Integrated Stereo Headphone Amplifier
Multibit ⌺-⌬ Converter Architecture for Improved S/N
Ratio Greater than 90 dB
16-Bit Stereo Full-Duplex Codec
Two Analog Line-Level Stereo Inputs for:
LINE-IN and CD
Mono MIC Input with Built-In Programmable Preamp
High-Quality CD Input with Ground Sense
Power Management Support
48-Terminal TQFP Package
FUNCTIONAL BLOCK DIAGRAM
MIC
LINE_IN
AD1887
MIC
PREAMP
CHIP SELECT
ENHANCED FEATURES
Full Duplex Variable Sample Rates from 7040 Hz to
48 kHz with 1 Hz Resolution
Software-Enabled V
Output for Microphones and
REFOUT
External Power Amp
Split Power Supplies (3.3 V Digital/5 V Analog)
Mobile Low-Power Mixer Mode
Extended 6-Bit Headphone Volume Control
Digital Audio Mixer Mode
PGA
V
REF
16-BIT
⌺-⌬ A/D
CONVERTER
V
REFOUT
CD
GA
GA
GA
M
M
M
GA
M
HP_OUT_L
HP_OUT_R
SoundMAX is a registered trademark of Analog Devices, Inc.
HP
HP
GA
M
SELECTOR
G = GAIN
A = ATTENUATE
M = MUTE
M
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 that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
SELECTOR
PGA
GA
GA
M
M
GA
M
GA
M
M
OSCILLATOR
XTL_OUT XTL_IN
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 www.analog.com
Fax: 781/326-8703 © Analog Devices, Inc., 2001
16-BIT
⌺-⌬ A/D
CONVERTER
SAMPLE
RATE
GENERATORS
16-BIT
⌺-⌬ A/D
CONVERTER
16-BIT
⌺-⌬ A/D
CONVERTER
AC
LINK
RESET
SYNC
BIT_CLK
SDATA_OUT
SDATA_IN
AD1887–SPECIFICATIONS
STANDARD TEST CONDITIONS UNLESS OTHERWISE NOTED
Temperature 25°C
Digital Supply (V
Analog Supply (V
Sample Rate (
) 3.3 V
DD
) 5.0 V
CC
fS) 48 kHz
Input Signal 1008 Hz
Analog Output Pass Band 20 Hz to 20 kHz
V
IH
V
IL
V
(CS0, CS1) 4.0 V
IH
V
IL
ANALOG INPUT
2.0 V
0.8 V
1.0 V
Parameter Min Typ Max Unit
Input Voltage (RMS Values Assume Sine Wave Input)
LINE_IN, CD 1V rms
MIC with 20 dB Gain 0.1 V rms
MIC with 0 dB Gain 1V rms
Input Impedance
Input Capacitance
*
*
DAC Test Conditions
Calibrated
–3 dB Attenuation Relative to Full Scale
Input 0 dB
32 Ω Output Load (HP_OUT)
ADC Test Conditions
Calibrated
0 dB Gain
Input –3.0 dB Relative to Full Scale
2.83 V p-p
0.283 V p-p
2.83 V p-p
20 kΩ
5 7.5 pF
HEADPHONE OUT VOLUME
Parameter Min Typ Max Unit
Step Size (+6 dB to –88.5 dB); HP_OUT_R, HP_OUT_L 1.5 dB
Output Attenuation Range Span
Mute Attenuation of 0 dB Fundamental
PROGRAMMABLE GAIN AMPLIFIER—ADC
*
*
–94.5 dB
80 dB
Parameter Min Typ Max Unit
Step Size (0 dB to 22.5 dB) 1.5 dB
PGA Gain Range Span 22.5 dB
ANALOG MIXER—INPUT GAIN/AMPLIFIERS/ATTENUATORS
Parameter Min Typ Max Unit
Signal-to-Noise Ratio (SNR)
CD to HP_OUT 90 dB
Other to HP_OUT 90 dB
Step Size (+12 dB to –34.5 dB): (All Steps Tested)
MIC, LINE_IN, CD, DAC 1.5 dB
Input Gain/Attenuation Range:
MIC, LINE_IN, CD, DAC –46.5 dB
DIGITAL DECIMATION AND INTERPOLATION FILTERS*
Parameter Min Typ Max Unit
Pass Band 0 0.4 ×
f
Hz
S
Pass-Band Ripple ± 0.09 dB
Transition Band 0.4 ×
Stop Band 0.6 ×
f
S
f
S
0.6 ×
f
Hz
S
∞ Hz
Stop-Band Rejection –74 dB
Group Delay 12/
f
S
sec
Group Delay Variation over Pass Band 0.0 µs
*Guaranteed but not tested.
–2–
REV. 0
AD1887
ANALOG-TO-DIGITAL CONVERTERS
Parameter Min Typ Max Unit
Resolution 16 Bits
Total Harmonic Distortion (THD) –84 dB
Dynamic Range (–60 dB Input THD + N Referenced to Full Scale, A-Weighted) 84 87 dB
*
Signal-to-Intermodulation Distortion
ADC Crosstalk
*
Line Inputs (Input L, Ground R, Read R; Input R, Ground L, Read L) –100 –90 dB
LINE_IN to Other –90 –85 dB
Gain Error (Full-Scale Span Relative to Nominal Input Voltage) ± 10 %
Interchannel Gain Mismatch (Difference of Gain Errors) ± 0.5 dB
ADC Offset Error ± 5mV
DIGITAL-TO-ANALOG CONVERTERS
Parameter Min Typ Max Unit
Resolution 16 Bits
Total Harmonic Distortion (THD) HP_OUT –75 dB
Dynamic Range (–60 dB Input THD + N Referenced to Full Scale, A-Weighted) 85 90 dB
Signal-to-Intermodulation Distortion
Gain Error (Full-Scale Span Relative to Nominal Input Voltage) ± 10 %
Interchannel Gain Mismatch (Difference of Gain Errors) ± 0.7 dB
*
DAC Crosstalk
(Input L, Zero R, Measure R_OUT; Input R, Zero L, –80 dB
Measure L_OUT)
Total Audible Out-of-Band Energy (Measured from 0.6 ×
(CCIF Method) 85 dB
*
(CCIF Method) –100 dB
fS to 20 kHz)
*
–40 dB
ANALOG OUTPUT
Parameter Min Typ Max Unit
Full-Scale Output Voltage; HP_OUT 1 V rms
2.83 V p-p
Output Impedance
*
External Load Impedance
Output Capacitance
*
*
32 Ω
800 Ω
15 pF
External Load Capacitance 100 pF
V
REF
V
REF_OUT
V
REF_OUT
Current Drive 5mA
2.05 2.25 2.45 V
2.25 V
Mute Click (Muted Output Minus Unmuted Midscale DAC Output) ± 5mV
STATIC DIGITAL SPECIFICATIONS
Parameter Min Typ Max Unit
High-Level Input Voltage (V
Low-Level Input Voltage (V
High-Level Output Voltage (V
Low-Level Output Voltage (V
IH
) 0.35 × DVDDV
IL
OH
OL
): Digital Inputs 0.65 × DV
), IOH = 2 mA 0.9 × DV
DD
DD
), IOL = 2 mA 0.1 × DV
DD
V
V
V
Input Leakage Current –10 +10 µA
Output Leakage Current –10 +10 µA
POWER SUPPLY
Parameter Min Typ Max Unit
Power Supply Range—Analog (AV
Power Supply Range—Digital (DV
) 4.75 5.25 V
DD
) 3.15 3.45 V
DD
Power Dissipation—5 V/3.3 V 253 mW
Analog Supply Current—5 V (AV
Digital Supply Current—3.3 V (DV
Power Supply Rejection (100 mV p-p Signal @ 1 kHz)
)36mA
DD
)22mA
DD
*
40 dB
(At Both Analog and Digital Supply Pins, Both ADCs and DACs)
*Guaranteed but not tested.
REV. 0
–3–
AD1887–SPECIFICATIONS
CLOCK SPECIFICATIONS*
Parameter Min Typ Max Unit
Input Clock Frequency 24.576 MHz
Recommended Clock Duty Cycle 40 50 60 %
POWER-DOWN STATES
Parameter Set Bits DVDD Typ AVDD Typ Unit
ADC PR0 15.82 30.0 mA
DAC PR1 15.08 26.3 mA
ADC + DAC PR1, PR0 3.79 19.9 mA
ADC + DAC + Mixer (Analog CD On) LPMIX, PR1, PR0 3.85 18.1 mA
Mixer PR2 17.65 17.4 mA
ADC + Mixer PR2, PR0 15.70 11.1 mA
DAC + Mixer PR2, PR1 15.07 8.3 mA
ADC + DAC + Mixer PR2, PR1, PR0 3.80 2.1 mA
Analog CD Only (AC-Link On) LPMIX, PR5, PR1, PR0 3.85 18.1 mA
Analog CD Only (AC-Link Off) LPMIX, PR1, PR0, PR4, PR5 0.06 18.1 mA
Standby PR5, PR4, PR3, PR2, PR1, PR0 0.06 0 mA
Headphone Standby PR6 17.66 26.1 mA
*Guaranteed but not tested.
Specifications subject to change without notice.
TIMING PARAMETERS (GUARANTEED OVER OPERATING TEMPERATURE RANGE)
Parameter Symbol Min Typ Max Unit
RESET Active Low Pulsewidth t
RESET Inactive to BIT_CLK Startup Delay t
SYNC Active High Pulsewidth t
SYNC Low Pulsewidth t
SYNC Inactive to BIT_CLK Startup Delay t
RST_LOW
RST2CLK
SYNC_HIGH
SYNC_LOW
SYNC2CLK
162.8 ns
162.8 ns
1.0 µs
1.3 µs
19.5 µs
BIT_CLK Frequency 12.288 MHz
BIT_CLK Period t
CLK_PERIOD
81.4 ns
BIT_CLK Output Jitter* 750 ps
BIT_CLK High Pulsewidth t
BIT_CLK Low Pulsewidth t
CLK_HIGH
CLK_LOW
32.56 42 48.84 ns
32.56 38 48.84 ns
SYNC Frequency 48.0 kHz
SYNC Period t
Setup to Falling Edge of BIT_CLK t
Hold from Falling Edge of BIT_CLK t
BIT_CLK Rise Time t
BIT_CLK Fall Time t
SYNC Rise Time t
SYNC Fall Time t
SDATA_IN Rise Time t
SDATA_IN Fall Time t
SDATA_OUT Rise Time t
SDATA_OUT Fall Time t
End of Slot 2 to BIT_CLK, SDATA_IN Low t
Setup to Trailing Edge of RESET (Applies to SYNC, SDATA_OUT) t
Rising Edge of RESET to HI-Z Delay t
SYNC_PERIOD
SETUP
HOLD
RISECLK
FALLCLK
RISESYNC
FALLSYNC
RISEDIN
FALLDIN
RISEDOUT
FALLDOUT
S2_PDOWN
SETUP2RST
OFF
5 2.5 ns
5ns
246 ns
246 ns
246 ns
246 ns
246 ns
246 ns
246 ns
246 ns
0 1.0 µs
15 ns
20.8 µs
25 ns
Propagation Delay 15 ns
RESET Rise Time 50 ns
Output Valid Delay from Rising Edge of BIT_CLK to SDI Valid 15 ns
*Output jitter is directly dependent on crystal input jitter.
Specifications subject to change without notice.
–4–
REV. 0
AD1887
RESET
BIT_CLK
SYNC
BIT_CLK
BIT_CLK
SYNC
t
RST_LOW
t
RST2CLK
Figure 1. Cold Reset
t
SYNC_HIGH
t
RST2CLK
Figure 2. Warm Reset
t
CLK_LOW
t
CLK_HIGH
t
CLK_PERIOD
t
SYNC_LOW
t
SYNC_HIGH
t
SYNC_PERIOD
BIT_CLK
t
RISECLK
SYNC
t
RISESYNC
SDATA_IN
t
RISEDIN
SDATA_OUT
t
RISEDOUT
Figure 5. Signal Rise and Fall Time
SLOT 2
SYNC
BIT_CLK
SDATA_OUT
SDATA_IN
SLOT 1
WRITE
TO 0x26
NOTE: BIT_CLK NOT TO SCALE
DATA
PR4
DON’T
CARE
t
FALLCLK
t
FALLSYNC
t
FALLDIN
t
FALLDOUT
t
S2_PDOWN
BIT_CLK
SYNC
SDATA_OUT
Figure 3. Clock Timing
t
SETUP
t
HOLD
Figure 4. Data Setup and Hold
Figure 6. AC Link Low Power Mode Timing
RESET
SDATA_OUT
SDATA_IN, BIT_CLK
t
OFF
t
SETUP2RST
HI-Z
Figure 7. ATE Test Mode
REV. 0
–5–
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