Analog Devices AD1887 Manual
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Analog Devices AD1887 Manual

Analog Devices AD1887 Manual

Ac’97 soundmax codec
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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
MIC
PREAMP
LINE_IN
CD
HP
HP_OUT_L
HP
HP_OUT_R
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.
FUNCTIONAL BLOCK DIAGRAM
ID0
AD1887
CHIP SELECT
MIC
GA
GA
M
M
GA
M
GA
G = GAIN
A = ATTENUATE
M = MUTE
ENHANCED FEATURES
Full Duplex Variable Sample Rates from 7040 Hz to
48 kHz with 1 Hz Resolution
Software-Enabled V
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
ID1
GA
GA
GA
M
M
M
M
M
M
M
M
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
AC'97 SoundMAX
Output for Microphones and
REFOUT
V
REF
16-BIT
PGA
- A/D
CONVERTER
16-BIT
PGA
- A/D
CONVERTER
SAMPLE
RATE
GENERATORS
16-BIT
GA
- A/D
CONVERTER
16-BIT
GA
- A/D
CONVERTER
OSCILLATOR
XTL_OUT
XTL_IN
© Analog Devices, Inc., 2001
®
Codec
AD1887
V
REFOUT
RESET
SYNC
AC
BIT_CLK
LINK
SDATA_OUT
SDATA_IN
www.analog.com

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Summary of Contents for Analog Devices AD1887

  • Page 1 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

  • Page 2: Standard Test Conditions Unless Otherwise Noted

    AD1887–SPECIFICATIONS STANDARD TEST CONDITIONS UNLESS OTHERWISE NOTED Temperature 25°C DAC Test Conditions Digital Supply (V 3.3 V Calibrated Analog Supply (V 5.0 V –3 dB Attenuation Relative to Full Scale Sample Rate (f 48 kHz Input 0 dB 32 Ω Output Load (HP_OUT)

  • Page 3: Digital-To-Analog Converters

    AD1887 ANALOG-TO-DIGITAL CONVERTERS Parameter Unit Resolution Bits Total Harmonic Distortion (THD) –84 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) –100...

  • Page 4: Clock Specifications

    AD1887–SPECIFICATIONS CLOCK SPECIFICATIONS* Parameter Unit Input Clock Frequency 24.576 Recommended Clock Duty Cycle POWER-DOWN STATES Parameter Set Bits Unit 15.82 30.0 15.08 26.3 ADC + DAC PR1, PR0 3.79 19.9 ADC + DAC + Mixer (Analog CD On) LPMIX, PR1, PR0 3.85...
  • Page 5 AD1887 BIT_CLK RST_LOW RST2CLK RISECLK FALLCLK RESET SYNC BIT_CLK RISESYNC FALLSYNC Figure 1. Cold Reset SDATA_IN RISEDIN FALLDIN RST2CLK SYNC_HIGH SYNC SDATA_OUT BIT_CLK RISEDOUT FALLDOUT Figure 2. Warm Reset Figure 5. Signal Rise and Fall Time CLK_LOW SLOT 1 SLOT 2...

  • Page 6: Absolute Maximum Ratings

    WARNING! accumulate on the human body and test equipment and can discharge without detection. Although the AD1887 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high-energy electrostatic discharges. Therefore, proper ESD precautions are ESD SENSITIVE DEVICE recommended to avoid performance degradation or loss of functionality.

  • Page 7: Pin Function Descriptions

    Type Description Chip Select Input 0 (Active Low) Chip Select Input 1 (Active Low) Analog I/O These signals connect the AD1887 component to analog sources and sinks, including microphones and speakers Pin Name TQFP Description CD_L CD Audio Left Channel...
  • Page 8 AD1887 No Connects Pin Name TQFP Type Description No Connect No Connect No Connect No Connect No Connect No Connect No Connect No Connect No Connect No Connect No Connect No Connect No Connect No Connect No Connect Indexed Control Registers...
  • Page 9 74h, which forces the serial configuration). Reading this register returns the ID code of the part and a code for the type of 3D Stereo Enhancement. ID[9:0] Identify Capability. The ID decodes the capabilities of AD1887 based on the following: Bit = 1 Function...
  • Page 10 AD1887 Mic Volume (Index 0Eh) D 5 1 D 5 1 D 5 1 D 5 1 D 4 1 D 4 1 D 4 1 D 4 1 D 3 1 D 3 1 D 3 1 D 3 1...
  • Page 11 AD1887 PCM Out Volume (Index 18h) X X X X X X X X X X X X X X X X X X X X X X X X X ROV[4:0] Right PCM Out Volume. Allows setting the PCM right channel attenuator in 32 steps. The LSB represents 1.5 dB, and the range is +12 dB to –34.5 dB.
  • Page 12 Note: The ready bits are read only, writing to REF, ANL, DAC, ADC will have no effect. These bits indicate the status for the AD1887 subsections. If the bit is a one, that subsection is “ready.” Ready is defined as the subsection able to perform in its nomi- nal state.
  • Page 13 AD1887 Extended Audio ID Register (Index 28h) X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X...
  • Page 14 Slave 2 Codec Register Mask. SLOT16 Enable 16-bit slots. If your system uses only a single AD1887, you can ignore the register mask bits. SLOT16 makes all AC Link slots 16 bits in length, formatted into 16 slots. Miscellaneous Control Bits (Index 76h)
  • Page 15 AD1887 Sample Rate 0 (Index 78h) D 5 1 D 5 1 D 5 1 D 5 1 D 4 1 D 4 1 D 4 1 D 4 1 D 3 1 D 3 1 D 3 1 D 3 1...

  • Page 16: Outline Dimensions

    AD1887 OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 48-Lead Thin Plastic Quad Flatpack (LQFP) (ST-48) 0.063 (1.60) 0.354 (9.00) BSC SQ 0.030 (0.75) 0.018 (0.45) 0.276 TOP VIEW (7.00) (PINS DOWN) COPLANARITY 0.003 (0.08) 0.019 (0.5) 0.011 (0.27) 0.008 (0.2) 0.006 (0.17)

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