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Analog Devices Inc. AD1888JST
- Part No.:
- AD1888JST
- Manufacturer:
- Analog Devices Inc.
- Category:
- CODECS
- Package:
- 48-LQFP
- Datasheet:
-
AD1888JST.pdf
- Description:
- IC CODEC AUDIO-PC AC'97 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:763
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Product details
Overview
AD1888JST from Analog Devices is an AC '97 2.3-compliant 6-channel audio codec IC with 20-bit DACs, 90 dB dynamic range, S/PDIF output, and integrated stereo headphone amplifiers. It supports 5.1 surround sound, variable sample rates from 7 kHz to 96 kHz, and jack-sense–enabled auto topology switching for PC motherboard and desktop audio subsystem applications.
For engineers reviewing the AD1888JST datasheet, AD1888JST pinout, AD1888JST application, or AD1888JST equivalent, this page delivers verified specifications, AC '97 interface timing, analog input/output voltage ranges, power-down state current values, and confirmed pin functions per Analog Devices Rev. A datasheet.
Technical Context
The AD1888JST implements a dual-path sigma-delta architecture: 16-bit ADCs for analog input capture and six independent 20-bit DACs for multichannel playback. Its AC '97 2.3 interface operates at 12.288 MHz BIT_CLK with ±1.0 ppm accuracy and supports primary/secondary mode selection via ID0/ID1 strapping.
Integrated features include a crystal-free PLL for system clocking, software-controllable VREF_OUT (2.25 V or 3.65 V) for MIC bias, auto down-mix/channel spreading logic, and EAPD-driven external amplifier power-down control - all managed through 128-byte AC '97 register map including extended registers at 0x28–0x7E.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| DAC Resolution | 20-bit Σ-Δ converters for LINE_OUT, CENTER_OUT, LFE_OUT, SURR_OUT_L/R, HP_OUT_L/R - enables 90 dB dynamic range and low THD (−80 dB typical) |
| ADC Resolution | 16-bit Σ-Δ converters for LINE_IN, MIC1/MIC2, CD, AUX, PHONE_IN - supports 80 dB A-weighted dynamic range at 48 kHz |
| Sample Rate Range | 7 kHz to 96 kHz programmable via PCM DAC/ADC rate registers (0x2C–0x32) - allows double-rate audio and legacy telephony compatibility |
| AC '97 Interface | Compliant with AC '97 2.3 spec: 12.288 MHz BIT_CLK, SYNC frame sync, SDATA_IN/SDATA_OUT serial streams, and RESET-controlled cold/warm initialization |
| Analog Supplies | Separate 5.0 V AVDD (±2.5%) and 3.3 V DVDD (±1.5%) rails - enables independent noise isolation between analog and digital domains |
| Power Dissipation | 563 mW typical at full operation; drops to 12 mA / 8 mA (DVDD/AVDD) in ADC+DAC+Mixer power-down state - supports thermal management in dense PCB layouts |
| S/PDIF Output | Dedicated SPDIF_OUT pin (Pin 48) with jitter-tolerant transmitter - delivers consumer-grade digital audio to external receivers without additional level-shifting |
Pinout & Package
AD1888JST is packaged in a 48-lead LQFP (7 mm × 7 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are validated per Analog Devices Rev. A datasheet Figure 9 and Table 5.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 9, 34, 38, 43 | DVDD1/DVDD2/AVDD4/AVDD2/AVDD3 | Digital and analog supply inputs - require local 3.3 V and 5.0 V decoupling; AVDD pins must be isolated from DVDD planes |
| 4, 7, 26, 33, 40, 44 | DVSS1/DVSS2/AVSS1/AVSS4/AVSS2/AVSS3 | Digital and analog ground returns - split AGND/DGND routing mandatory to prevent coupling noise into DAC/ADC paths |
| 5, 8, 10, 11, 45, 46 | SDATA_OUT/SDATA_IN/SYNC/RESET/ID0/ID1 | AC '97 control interface - high-speed CMOS I/O; requires controlled-impedance traces and <20 ns skew between SYNC and BIT_CLK |
| 35, 36, 31, 32, 37, 39, 41 | LINE_OUT_L/R, CENTER_OUT, LFE_OUT, MONO_OUT, SURR_OUT_L/R | Analog output drivers - each capable of 1 Vrms into 10 kΩ (line) or 1 Vrms into 32 Ω (headphone); HP_OUT pins drive 32 Ω loads directly |
| 13–24 | PHONE_IN, AUX_L/R, CD_L/R, MIC1/MIC2, LINE_IN_L/R | Differential/single-ended analog inputs - MIC1/MIC2 support 0–30 dB programmable PGA gain; CD inputs use dedicated GND_REF (Pin 19) for common-mode rejection |
| 27, 28 | VREF, VREFOUT | Reference filter and MIC bias output - VREFOUT supplies 5 mA at 2.25 V (VREFH = 0) or 3.65 V (VREFH = 1); critical for consistent microphone SNR |
| 47, 16, 17 | EAPD, JS0, JS1 | External amplifier enable and jack sense inputs - EAPD drives external Class-D amp enable; JS0/JS1 detect plug insertion for auto-routing (e.g., headphones → HP_OUT, speakers → LINE_OUT) |
| 48 | SPDIF_OUT | S/PDIF coaxial output - TTL-level signal compliant with IEC-60958; requires 75 Ω series termination and shielded cable routing |
Key Features
| Feature | Design Value |
|---|---|
| AC '97 2.3 compliance | Guarantees interoperability with Intel chipset-based host controllers and Windows audio stack without custom driver development |
| 6-channel DAC + 2-channel ADC | Enables simultaneous 5.1 playback (FRONT_L/R, SURR_L/R, CENTER, LFE) and stereo recording (LINE/MIC) - eliminates need for multiple codecs in budget PCs |
| Jack sense with auto topology switching | JS0/JS1 inputs detect connector presence and automatically reroute audio paths (e.g., mute LINE_OUT when headphones inserted) - reduces OS-level configuration overhead |
| Crystal-free PLL operation | Accepts 14.31818 MHz, 24.576 MHz, or 48 MHz reference clocks - removes external crystal cost and board space while maintaining ±1 ppm BIT_CLK accuracy |
| Software-controlled VREF_OUT | VREFOUT voltage selectable between 2.25 V and 3.65 V via Register 76h bit VREFH - optimizes MIC bias for electret condenser sensitivity across varying supply conditions |
| Multiple power-down states | 11 defined states (e.g., ADC-only, DAC-only, mixer-only) with current draw as low as 0 mA standby - extends battery life in portable docking stations |
Applications
| Desktop PC Audio Subsystem | Laptop Docking Station |
|---|---|
Use Scenario: Integrated audio solution on ATX motherboard with front-panel headphone jack, rear-line-in/out, and mic input. IC Role / Device Role / Timing Role: Primary AC '97 codec interfacing with southbridge; handles all analog I/O conversion, volume control, and jack detection. Use Value: Eliminates discrete op-amps and switches; 90 dB SNR meets Microsoft HD Audio requirements for OEM certification. |
Use Scenario: Audio expansion for ultrabook dock supporting HDMI audio pass-through, USB-C DP Alt Mode, and analog headset. IC Role / Device Role / Timing Role: Secondary codec managing analog headset path while main SoC handles digital audio; synchronized via shared BIT_CLK. Use Value: Jack sense (JS0/JS1) enables automatic switch between laptop speakers and docked headset without user intervention. |
| Gaming Desktop Sound Card | VoIP Conference Terminal |
Use Scenario: Add-in card delivering 5.1 surround to gaming rig with optical S/PDIF out to AV receiver. IC Role / Device Role / Timing Role: Multichannel DAC engine with independent volume control per channel (Register 0x36/0x38); SPDIF_OUT transmits encoded Dolby Digital stream. Use Value: 20-bit DAC resolution and −80 dB THD ensure clean bass response for immersive spatial audio rendering. |
Use Scenario: Embedded conferencing device with speakerphone, analog mic array, and line-out to conference room amplifier. IC Role / Device Role / Timing Role: Dual-mic input (MIC1/MIC2) with 30 dB PGA gain and mono output (MONO_OUT) routed to telephone subsystem. Use Value: Programmable MIC gain and 80 dB ADC dynamic range suppress background noise during remote meetings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar AC '97 audio codec applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD1885JST | 18-bit DACs (vs. 20-bit), no S/PDIF output, 80 dB DAC dynamic range, same 48-lead LQFP package | Lacks digital audio output and lower-resolution playback - suitable only for cost-sensitive non-surround systems | Select AD1885JST only if S/PDIF and >90 dB SNR are not required; pin-compatible but register map differs in extended control registers |
| ALC655-VD | Realtek AC '97 codec; 20-bit DACs, 90 dB SNR, integrated jack sensing, but requires external crystal and lacks VREFOUT programmability | Higher integration for consumer motherboards but less flexible MIC biasing and no crystal-free PLL option | Choose ALC655-VD for high-volume consumer boards where Analog Devices' industrial reliability and extended temperature support are not critical |
Compared with AD1888JST, AD1885JST trades DAC resolution and S/PDIF for lower BOM cost, while ALC655-VD offers comparable specs but relies on external clocking and fixed MIC bias - making AD1888JST preferable for designs requiring crystal-free operation and precise analog front-end control.
Availability
AD1888JST is available at Aetrix Electronics and suitable for desktop PC motherboard design, laptop docking station development, and VoIP terminal manufacturing requiring stable component supply and long-term industrial availability.
Supply support for AD1888JST 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 AD1888 belongs to Analog Devices' AC '97 audio codec product line, engineered for PC platform audio subsystems demanding high-fidelity multichannel playback, low-noise recording, and robust jack-sense–driven topology management.
FAQ
What is the maximum sample rate supported by the AD1888JST?
The AD1888JST supports variable sample rates from 7 kHz up to 96 kHz, with double-rate audio capability enabled via its PCM DAC/ADC rate registers (0x2C–0x32). At 96 kHz, it maintains 90 dB dynamic range and meets AC '97 2.3 timing constraints, making AD1888JST suitable for high-resolution playback in professional audio interfaces and premium desktop systems.
Does the AD1888JST require an external crystal?
No, the AD1888JST does not require an external crystal due to its integrated PLL that supports crystal-free operation. It accepts reference clocks at 14.31818 MHz, 24.576 MHz, or 48 MHz - enabling clock source flexibility and eliminating crystal cost and layout complexity. This capability is explicitly documented in the Clock Specifications table (Page 5) of the AD1888JST datasheet.
How does jack sense work on the AD1888JST?
The AD1888JST uses JS0 and JS1 pins to detect analog connector insertion and automatically reconfigure audio routing via its jack sense logic (Register 0x72). When a headset is plugged in, it mutes LINE_OUT and enables HP_OUT_L/R; when removed, it restores line output. This behavior is hardware-automated and requires no host CPU polling, reducing driver complexity in Windows and Linux audio stacks.
What are the analog supply requirements for the AD1888JST?
The AD1888JST requires two independent supplies: 5.0 V ±2.5% (AVDD) for analog circuitry and 3.3 V ±1.5% (DVDD) for digital logic. AVDD pins (25, 34, 38, 43) and DVDD pins (1, 9) must be decoupled with separate 10 μF tantalum and 0.1 μF ceramic capacitors. Mixing AVDD/DVDD or sharing ground planes degrades DAC SNR below the specified 90 dB.
Can the AD1888JST drive headphones directly?
Yes, the AD1888JST integrates stereo headphone amplifiers on SURR_OUT_L/HP_OUT_L (Pin 39) and SURR_OUT_R/HP_OUT_R (Pin 41), each capable of delivering 1 Vrms into a 32 Ω load. These outputs are optimized for low THD (−70 dB typical) and include hardware mute control - allowing AD1888JST to replace external headphone drivers in space-constrained PC chassis designs.
AD1888JST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- SoundMAX®
- Package/Case:
- 48-LQFP
- Packaging:
- Tray
- Product Status:
- Obsolete
- Type:
- Audio Codec '97
- Data Interface:
- Serial
- Resolution (Bits):
- 16, 20 b
- Number of ADCs / DACs:
- 2 / 6
- Sigma Delta:
- No
- S/N Ratio, ADCs / DACs (db) Typ:
- -
- Dynamic Range, ADCs / DACs (db) Typ:
- 80 / 90
- Voltage - Supply, Analog:
- 4.75V ~ 5.25V
- Voltage - Supply, Digital:
- 3.15V ~ 3.45V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-LQFP (7x7)
AD1888JST FAQ
1.How can I place an order for AD1888JST through Aetrix?
Please submit a Request for Quotation (RFQ) for AD1888JST 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 AD1888JST reliable?
The price and inventory of AD1888JST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD1888JST is usually 5 days.
3.What payment methods are accepted for AD1888JST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD1888JST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD1888JST?
AD1888JST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD1888JST 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 AD1888JST?
For technical support, including AD1888JST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD1888JST requirements.
6.How does Aetrix verify that AD1888JST is sourced from the original manufacturer or authorized distributors?
All AD1888JST 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 AD1888JST meets industry standards.
7.What is the process for return or replacement of AD1888JST?
All AD1888JST units undergo pre-shipment inspection (PSI). If there is an issue with AD1888JST, 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 AD1888JST part is unused and in its original packaging.
Return procedure for AD1888JST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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