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Product Detailed Parameters
- Description：IC CODEC STEREO 6-DAC 20B 48LQFP
- Series：SoundMAX®
- Mfr：Analog Devices Inc.
- Package：Bulk
- Type：Audio Codec '97
- Data Interface：Serial
- Resolution (Bits)：16, 20 b
- Sigma Delta：No
- S/N Ratio, ADCs / DACs (db) Typ：-
- Dynamic Range, ADCs / DACs (db) Typ：84 / 90
- Voltage - Supply, Analog：4.5V ~ 5.5V
- Voltage - Supply, Digital：2.97V ~ 3.63V
- Operating Temperature：0°C ~ 70°C
- Mounting Type：Surface Mount
- Package / Case：48-LQFP
- Supplier Device Package：48-LQFP (7x7)
- Grade：-
- Qualification：-
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Overview
The AD1985JST-REEL is an AC '97 2.3 compliant audio codec manufactured by Analog Devices Inc., housed in a 48-lead LQFP package. It features six DAC channels for 5.1 surround sound with 20-bit resolution and greater than 90 dB dynamic range. The device includes integrated stereo headphone amplifiers, S/PDIF output, and variable rate audio support up to 96 kHz double rate. It incorporates two ADCs with 16-bit resolution and supports advanced jack sensing with auto topology switching.
Feature Summary
- Integrated parametric equalizer and stereo microphone preamplifiers
- Advanced jack sense with auto topology switching capabilities
- Built-in stereo microphone and Center/LFE pin sharing functionality
Applications
- AC '97 compliant motherboard audio subsystems
- 5.1 surround sound desktop PC audio solutions
- High-quality CD mixer input applications
Procurement Notes
Verify the component against the official Analog Devices datasheet Rev. A specifications. Confirm that the 48-lead LQFP package matches the required footprint. Ensure compatibility with AC '97 2.3 interface protocols before integration into the design.
Selection Notes
Select this component when a complete AC '97 audio solution with integrated headphone drivers and 5.1 channel support is required. Consider the 20-bit DAC resolution and built-in EQ features for high-fidelity audio processing needs.
Part Context
This part belongs to the AD1985 series of Audio CODECs designed for PC audio applications. It provides a comprehensive analog and digital audio processing solution within a single integrated circuit, supporting both standard and enhanced audio features defined in the AC '97 specification.
Replacement Considerations
Consult the manufacturer's ordering guide for direct replacements or updated revisions. Verify pinout and register compatibility if substituting with other AC '97 codecs from the same product family.
FAQ
What is the maximum sample rate supported by the AD1985?
The AD1985 supports variable sample rates from 7 kHz to 48 kHz in 1 Hz increments, and up to 96 kHz for double rate audio.
Does the AD1985 include hardware 3D stereo enhancement?
No, the AD1985 does not provide hardware 3D stereo enhancement; all SE bits in the Reset register are set to 0.
How many analog-to-digital converters are integrated in the AD1985?
The AD1985 integrates two 16-bit Sigma-Delta ADCs.
