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Analog Devices Inc. AD1886AJST
- Part No.:
- AD1886AJST
- Manufacturer:
- Analog Devices Inc.
- Category:
- CODECS
- Package:
- 48-LQFP
- Datasheet:
-
AD1886AJST.pdf
- Description:
- IC CODEC STEREO 16BIT 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:5,097
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Product details
Overview
AD1886AJST from Analog Devices is a 16-bit stereo full-duplex AC'97 2.2-compliant audio codec IC designed for PC motherboard and desktop audio subsystems. It integrates dual 16-bit ADCs and DACs, a stereo headphone amplifier (±6 dB to –88.5 dB gain), 90 dB SNR, SPDIF output, and Phat™ 3D stereo enhancement - enabling high-fidelity audio capture and playback in legacy AC-Link-based systems.
For engineers reviewing the AD1886AJST datasheet, AD1886AJST pinout, AD1886AJST application, or AD1886AJST equivalent, key selection considerations include its 48-lead LQFP package, split 3.3 V digital / 5 V analog supply operation, AC'97 link timing compliance, jack sense GPIO capability, and support for variable sample rates from 7.04 kHz to 48 kHz with 1 Hz resolution.
Technical Context
The AD1886AJST implements a dedicated AC'97 2.2 interface with BIT_CLK (12.288 MHz), SYNC, SDATA_IN, and SDATA_OUT signals, supporting daisy-chained topologies. Its analog front-end includes programmable gain amplifiers (0–22.5 dB) for MIC inputs, six stereo line-level inputs (LINE_IN, CD, VIDEO, AUX), and two mono inputs (PHONE_IN, PC_BEEP), all routed through a fully configurable digital mixer.
Digital audio processing features include decimation/interpolation filters with ±0.09 dB passband ripple and –74 dB stopband rejection, 16-bit sigma-delta converters, and register-mapped control (e.g., Index 02h master volume, Index 0Eh mic gain). Power-down states are managed via PR[0:6] bits, enabling sub-5 mA operation in ADC+DAC+Mixer low-power mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit ADC/DAC - supports CD-quality audio sampling at 44.1/48 kHz with A-weighted dynamic range ≥84 dB (ADC) and ≥85 dB (DAC). |
| Dynamic Range | ≥90 dB SNR - ensures clean signal path for line-in to line-out routing with minimal noise floor interference. |
| Sample Rate Range | 7.04 kHz to 48 kHz with 1 Hz resolution - enables flexible audio clocking for voice, telephony, and multimedia applications without external PLL reconfiguration. |
| SPDIF Output | 20-bit SPDIF at 32/44.1/48 kHz - provides bitstream-compatible digital audio output for external DACs or receivers without requiring additional format conversion logic. |
| Power Dissipation | 306 mW typical (5 V/3.3 V) - optimized for thermally constrained PC audio subsystems; drops to 2.2 mW in full power-down mode (PR2–PR0). |
| Package | 48-lead LQFP (ST-48) - surface-mount compatible with standard PCB assembly processes and thermal resistance θJA = 76.2°C/W. |
| AC'97 Compliance | AC'97 2.2 compliant - guarantees interoperability with Intel Southbridge controllers and other AC'97 host codecs in legacy PC platforms. |
Pinout & Package
AD1886AJST is housed in a 48-lead thin quad flatpack (LQFP) package (ST-48), with exposed pad for thermal management and pin 1 identifier marked on top view.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| XTL_IN (Pin 2) | Clock Input | 24.576 MHz crystal or oscillator input - drives internal PLL to generate BIT_CLK and sample rate clocks; requires external load capacitance per crystal spec. |
| BIT_CLK (Pin 6) | AC'97 Bit Clock Output | 12.288 MHz clock synchronized to AC'97 frame timing - used by host controller to sample SDATA_IN/SDATA_OUT; jitter ≤750 ps ensures timing margin for multi-slot transfers. |
| SDATA_IN (Pin 8) | AC'97 Serial Data Input | Host-to-codec data stream carrying DAC channel data, control writes, and slot assignments - sampled on falling edge of BIT_CLK per AC'97 spec. |
| SDATA_OUT (Pin 5) | AC'97 Serial Data Output | Codec-to-host data stream carrying ADC samples and status reads - driven synchronously with BIT_CLK and aligned to SYNC frame boundaries. |
| JS (Pin 47) | Jack Sense / GPIO | Configurable as plug-detection input (e.g., for headphone insertion) or general-purpose digital output - enables automatic mute/switching without host CPU intervention. |
| VREFOUT (Pin 28) | Mic Bias Reference | 2.25 V regulated output with 5 mA drive - powers electret microphone bias circuits; software-enabled via register bit to reduce idle current. |
| HP_OUT_L/R (Pins 39, 41) | Stereo Headphone Outputs | Capable of driving 32 Ω loads directly - integrated amplifier supports +6 dB to –88.5 dB volume control in 1.5 dB steps with mute function. |
| SPDIF (Pin 48) | Digital Audio Output | 20-bit SPDIF serial output compliant with IEC-60958 - connects directly to optical or coaxial transmitters without level-shifting or buffering. |
Key Features
| Feature | Design Value |
|---|---|
| Phat™ Stereo 3D Enhancement | Hardware-accelerated spatial audio processing using RX3D/CX3D external RC network - adds perceptual width and depth without consuming host CPU cycles or requiring driver-side DSP. |
| Jack Sense with Automatic Switching | Dedicated JS pin with programmable interrupt and auto-mute logic - eliminates need for external comparators or microcontroller polling when headphones or speakers are connected. |
| Mobile Low-Power Mixer Mode | LPMIX bit enables analog CD path while powering down ADC/DAC blocks - reduces analog supply current to 22.4 mA for always-on audio monitoring with minimal power penalty. |
| Software-Enabled VREFOUT | VREFOUT can be disabled via register write - cuts 5 mA bias current during standby, improving system-level battery life in portable AC'97 implementations. |
| Extended Volume Control | 6-bit master volume (–94.5 dB range), 6-bit headphone volume (+6 dB to –88.5 dB), and independent 5-bit channel gains - enables precise loudness matching across diverse output devices (speakers, headphones, line-level amps). |
Applications
| Desktop PC Audio Subsystem | Legacy Industrial HMI Terminal |
|---|---|
Use Scenario: Integrated audio solution on ATX motherboard with AC'97 Southbridge chipset, supporting line-in recording, CD playback, and speakerphone functionality. IC Role / Device Role / Timing Role: Primary AC'97 codec handling all analog I/O, sample rate generation, and AC-Link protocol framing - operates under BIT_CLK/SYNC timing controlled by host. Use Value: Eliminates need for discrete op-amps, ADCs, DACs, and SPDIF transmitters; reduces BOM count by >12 components versus discrete audio signal chain. | Use Scenario: Operator interface panel in factory automation system requiring voice feedback, alarm tones, and microphone-based voice command input. IC Role / Device Role / Timing Role: Audio interface IC managing PC_BEEP passthrough, PHONE_IN telephony input, and MONO_OUT speakerphone output - uses jack sense to auto-route audio based on peripheral presence. Use Value: Enables hands-free operation with zero-latency mute switching and built-in 20 dB mic preamp - avoids external gain stages and improves SNR in electrically noisy industrial environments. |
| Embedded Media Player | AC'97-Compatible Evaluation Platform |
Use Scenario: Compact media player board using VIA or AMD Geode processor with native AC'97 support, playing MP3/WMA files with headphone and line-out options. IC Role / Device Role / Timing Role: Full-duplex audio codec providing simultaneous decode (DAC) and encode (ADC) paths - leverages variable sample rate capability to match decoder output without resampling artifacts. Use Value: Supports 7.04–48 kHz sample rates natively - preserves audio fidelity across speech (8 kHz), telephony (16 kHz), and Hi-Fi (44.1/48 kHz) content without interpolation loss. | Use Scenario: Reference design for validating AC'97 host controller firmware, testing SPDIF output integrity, or characterizing Phat™ 3D effect with calibrated measurement equipment. IC Role / Device Role / Timing Role: Standalone test target IC with complete register map access, SPDIF loopback capability, and debug pins (ID0/ID1) - used to verify AC'97 link initialization, timing margins, and power-state transitions. Use Value: Provides production-traceable timing parameters (e.g., tSYNC_HIGH = 1.3 ms, tCLK_PERIOD = 81.4 ns) - enables accurate validation of host-side AC'97 controller timing compliance before silicon tape-out. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar audio codec applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD1885AST | 16-bit AC'97 2.1 codec; lacks SPDIF output, Phat™ 3D, and mobile low-power mixer mode; identical pinout and register map. | Targeted at cost-sensitive desktop boards where SPDIF and 3D audio are not required; lower power dissipation (275 mW) but no 20-bit digital output. | Select AD1885AST only if SPDIF and Phat™ features are excluded from system requirements - retains full software compatibility and layout reuse. |
| WM9705G | 16-bit AC'97 2.2 codec from Wolfson; includes touch-screen controller interface; different register mapping and pin assignment; no VREFOUT or jack sense GPIO. | Designed for portable pen-based devices with integrated touchscreen; requires redesign of driver stack and PCB layout due to non-pin-compatible footprint. | Choose WM9705G only when touchscreen integration is mandatory and AC'97 host firmware can accommodate register-level differences - not a drop-in replacement. |
Compared with AD1886AJST, AD1885AST removes SPDIF and Phat™ but maintains identical AC'97 timing and power-down behavior, while WM9705G trades audio-only focus for mixed-signal integration at the cost of full hardware and software incompatibility.
Availability
AD1886AJST is available at Aetrix Electronics and suitable for desktop PC motherboards, industrial HMIs, embedded media players, and AC'97 evaluation platforms requiring stable component supply and long-term obsolescence management.
Supply support for AD1886AJST includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The AD1886A product line delivers AC'97-compliant audio codecs optimized for PC platform integration, emphasizing low-jitter clocking, high-SNR analog paths, and feature-rich digital audio processing for legacy and transitional computing architectures.
FAQ
What is the primary interface standard supported by the AD1886AJST?
The AD1886AJST is an AC'97 2.2-compliant audio codec, implementing the standardized AC'97 serial interface with BIT_CLK, SYNC, SDATA_IN, and SDATA_OUT signals. It supports daisy-chained configurations and full AC'97 2.2 register definitions, ensuring interoperability with Intel Southbridge and compatible host controllers. The AD1886AJST does not support I²S, SPI, or PCM interface modes - its communication is exclusively AC'97 link-based.
Does the AD1886AJST require an external crystal, and what frequency is needed?
Yes, the AD1886AJST requires a 24.576 MHz fundamental-mode crystal connected between XTL_IN (Pin 2) and XTL_OUT (Pin 3). This frequency is mandatory to generate the AC'97 BIT_CLK (12.288 MHz) and all internal sample rate clocks. Using any other frequency - including 12.288 MHz or 49.152 MHz - will result in incorrect AC'97 timing and failure to meet tSYNC_HIGH (1.3 ms) and tCLK_PERIOD (81.4 ns) specifications defined in the AD1886AJST datasheet.
Can the AD1886AJST drive headphones directly, and what is its output capability?
Yes, the AD1886AJST integrates stereo headphone amplifiers on HP_OUT_L (Pin 39) and HP_OUT_R (Pin 41), each capable of delivering 1 Vrms into a 32 Ω load. It supports +6 dB to –88.5 dB volume control in 1.5 dB steps and hardware mute. The amplifier is optimized for direct connection to standard 3.5 mm headphone jacks without external buffering, and its THD is –75 dB at full scale - meeting consumer audio fidelity requirements for desktop and embedded applications using the AD1886AJST.
What power supply configuration does the AD1886AJST require?
The AD1886AJST requires split supplies: 5.0 V ±5% (AVDD1/2/3) for analog circuitry and 3.3 V ±10% (DVDD1/2) for digital logic. AVSS1/2/3 and DVSS1/2 must be separately decoupled. This separation prevents digital noise from coupling into sensitive analog paths such as ADC inputs and headphone outputs. Operating the AD1886AJST outside these ranges - e.g., 3.3 V on AVDD or 5 V on DVDD - violates Absolute Maximum Ratings and may cause permanent damage or undefined behavior.
How does the jack sense (JS) pin function on the AD1886AJST?
The JS pin (Pin 47) on the AD1886AJST serves dual roles: as a jack sense input to detect plug insertion in headphone or line-out jacks (triggering automatic mute/switching), or as a general-purpose digital output when configured via register 72h. Its operation is controlled by JSC, JSMM, and JSOE bits - no external pull-up/down resistors are required for basic sensing. This eliminates the need for external comparators or GPIO expansion in systems using the AD1886AJST for audio peripheral detection.
AD1886AJST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- SoundMAX®
- Package/Case:
- 48-LQFP
- Packaging:
- Bag
- Product Status:
- Obsolete
- Type:
- Audio Codec '97
- Data Interface:
- Serial
- Resolution (Bits):
- 16 b
- Number of ADCs / DACs:
- 2 / 2
- Sigma Delta:
- Yes
- S/N Ratio, ADCs / DACs (db) Typ:
- -
- Dynamic Range, ADCs / DACs (db) Typ:
- 87 / 90
- Voltage - Supply, Analog:
- 4.75V ~ 5.25V
- Voltage - Supply, Digital:
- 3V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-LQFP (7x7)
AD1886AJST FAQ
1.How can I place an order for AD1886AJST through Aetrix?
Please submit a Request for Quotation (RFQ) for AD1886AJST on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AD1886AJST reliable?
The price and inventory of AD1886AJST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD1886AJST is usually 5 days.
3.What payment methods are accepted for AD1886AJST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD1886AJST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD1886AJST?
AD1886AJST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD1886AJST order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AD1886AJST?
For technical support, including AD1886AJST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD1886AJST requirements.
6.How does Aetrix verify that AD1886AJST is sourced from the original manufacturer or authorized distributors?
All AD1886AJST products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AD1886AJST meets industry standards.
7.What is the process for return or replacement of AD1886AJST?
All AD1886AJST units undergo pre-shipment inspection (PSI). If there is an issue with AD1886AJST, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AD1886AJST part is unused and in its original packaging.
Return procedure for AD1886AJST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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