AD1887 Codec Datasheet

AD1887 Datasheet, PDF, Equivalent


Part Number

AD1887

Description

AC97 SoundMAX Codec

Manufacture

Analog Devices

Total Page 16 Pages
Datasheet
Download AD1887 Datasheet


AD1887
a
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
AC’97 SoundMAX® Codec
AD1887
ENHANCED FEATURES
Full Duplex Variable Sample Rates from 7040 Hz to
48 kHz with 1 Hz Resolution
Software-Enabled VREFOUT 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 Headphone Volume Control
Digital Audio Mixer Mode
FUNCTIONAL BLOCK DIAGRAM
ID0 ID1
MIC
LINE_IN
CD
AD1887
MIC
PREAMP
HP_OUT_L
HP M GA
HP_OUT_R
HP M GA
CHIP SELECT
VREF
VREFOUT
GA GA GA GA GA
MMMMM
M
G = GAIN
A = ATTENUATE
M = MUTE
M
PGA
16-BIT
-A/D
CONVERTER
PGA
16-BIT
-A/D
CONVERTER
SAMPLE
RATE
GENERATORS
M GA
16-BIT
-A/D
CONVERTER
M GA
16-BIT
-A/D
CONVERTER
OSCILLATOR
XTL_OUT XTL_IN
AC
LINK
RESET
SYNC
BIT_CLK
SDATA_OUT
SDATA_IN
SoundMAX is a registered 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 that
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
www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2001

AD1887
AD1887–SPECIFICATIONS
STANDARD TEST CONDITIONS UNLESS OTHERWISE NOTED
Temperature
Digital Supply (VDD)
Analog Supply (VCC)
Sample Rate (fS)
Input Signal
Analog Output Pass Band
VIH
VIL
VIH (CS0, CS1)
VIL
25°C
3.3 V
5.0 V
48 kHz
1008 Hz
20 Hz to 20 kHz
2.0 V
0.8 V
4.0 V
1.0 V
DAC Test Conditions
Calibrated
–3 dB Attenuation Relative to Full Scale
Input 0 dB
32 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, CD
MIC with 20 dB Gain
MIC with 0 dB Gain
Input Impedance*
Input Capacitance*
Min Typ Max
1
2.83
0.1
0.283
1
2.83
20
5
7.5
Unit
V rms
V p-p
V rms
V p-p
V rms
V p-p
k
pF
HEADPHONE OUT VOLUME
Parameter
Step Size (+6 dB to –88.5 dB); HP_OUT_R, HP_OUT_L
Output Attenuation Range Span*
Mute Attenuation of 0 dB Fundamental*
Min
Typ
Max
Unit
1.5
–94.5
80
dB
dB
dB
PROGRAMMABLE GAIN AMPLIFIER—ADC
Parameter
Step Size (0 dB to 22.5 dB)
PGA Gain Range Span
Min
Typ
Max
Unit
1.5 dB
22.5 dB
ANALOG MIXER—INPUT GAIN/AMPLIFIERS/ATTENUATORS
Parameter
Signal-to-Noise Ratio (SNR)
CD to HP_OUT
Other to HP_OUT
Step Size (+12 dB to –34.5 dB): (All Steps Tested)
MIC, LINE_IN, CD, DAC
Input Gain/Attenuation Range:
MIC, LINE_IN, CD, DAC
Min
Typ
Max
Unit
90
90
1.5
–46.5
dB
dB
dB
dB
DIGITAL DECIMATION AND INTERPOLATION FILTERS*
Parameter
Pass Band
Pass-Band Ripple
Transition Band
Stop Band
Stop-Band Rejection
Group Delay
Group Delay Variation over Pass Band
*Guaranteed but not tested.
–2–
Min
Typ
Max
Unit
0
0.4 × fS
0.6 × fS
–74
0.4 × fS
± 0.09
0.6 × fS
12/fS
0.0
Hz
dB
Hz
Hz
dB
sec
µs
REV. 0


Features a AC’97 2.1 FEATURES Variable Sample R ate Audio AC’97 FEATURES AC’97 2.2 Compliant Greater than 90 dB Dynamic Ra nge Integrated Stereo Headphone Amplifi er Multibit ⌺- ⌬ Converter Architec ture for Improved S/N Ratio Greater tha n 90 dB 16-Bit Stereo Full-Duplex Codec Two Analog Line-Level Stereo Inputs fo r: LINE-IN and CD Mono MIC Input with B uilt-In Programmable Preamp High-Qualit y CD Input with Ground Sense Power Mana gement Support 48-Terminal TQFP Package AC’97 SoundMAX® Codec AD1887 ENHAN CED FEATURES Full Duplex Variable Sampl e Rates from 7040 Hz to 48 kHz with 1 H z Resolution Software-Enabled VREFOUT O utput for Microphones and External Powe r Amp Split Power Supplies (3.3 V Digit al/5 V Analog) Mobile Low-Power Mixer M ode Extended 6-Bit Headphone Volume Con trol Digital Audio Mixer Mode FUNCTION AL BLOCK DIAGRAM ID0 ID1 AD1887 MIC MI C PREAMP CHIP SELECT VREF VREFOUT C D SELECTOR LINE_IN PGA 16-BIT ⌺- A/D CONVERTER PGA 16-BIT ⌺-⌬ A/D CONVERTER RESET SYNC GA M GA M GA M G.
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