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Analog Devices Inc. AD1887JST
- Part No.:
- AD1887JST
- Manufacturer:
- Analog Devices Inc.
- Category:
- CODECS
- Package:
- 48-LQFP
- Datasheet:
-
AD1887JST.pdf
- Description:
- IC CODEC STEREO 16BIT 48-TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,772
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Product details
Overview
AD1887JST from Analog Devices is a 16-bit stereo full-duplex AC'97 2.2-compliant audio codec IC with integrated headphone amplifier, programmable microphone preamp, and split 3.3 V digital / 5 V analog power supplies. It supports variable sample rates from 7040 Hz to 48 kHz (1 Hz resolution), delivers >90 dB dynamic range, and features software-enabled VREFOUT for mic bias. It serves as the primary audio interface in PC motherboard audio subsystems and legacy embedded multimedia platforms.
For engineers reviewing the AD1887JST datasheet, AD1887JST pinout, AD1887JST application, or AD1887JST equivalent, key selection considerations include AC'97 link timing compliance, dual-supply rail tolerance, 48-TQFP package footprint, and register-level control of mixer gain, headphone volume (–88.5 dB attenuation), and low-power mode sequencing.
Technical Context
The AD1887JST implements a multibit ΔΣ converter architecture for both ADC and DAC paths, achieving >90 dB SNR and >84 dB A-weighted dynamic range. Its AC'97 2.2-compliant serial interface uses BIT_CLK (12.288 MHz), SYNC (48 kHz), SDATA_IN, and SDATA_OUT for frame-synchronized bidirectional data transfer with host controller.
It integrates independent analog signal chains: two stereo line-level inputs (LINE_IN, CD), one mono MIC input with 0–22.5 dB programmable gain, and stereo headphone outputs with 6-bit volume control (±1.5 dB steps). Power-down states are controlled via indexed register 26h (PR0–PR5 bits), enabling granular current reduction down to 60 µA in standby.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit ADC/DAC - ensures compatibility with standard AC'97 host controllers and avoids bit-depth conversion overhead |
| Dynamic Range | ≥87 dB (ADC), ≥90 dB (DAC) A-weighted - meets CD-quality audio fidelity requirements without external post-processing |
| Sample Rate Range | 7040 Hz to 48 kHz with 1 Hz resolution - supports voice, telephony, and full-bandwidth audio applications from single-slot to multi-slot AC'97 frames |
| Headphone Output | Integrated stereo amplifier driving 32 Ω loads at 1 VRMS - eliminates need for external buffer stages in cost-sensitive designs |
| Power Supply | Split rails: 3.3 V DVDD & 5.0 V AVDD - isolates digital noise from sensitive analog audio paths, reducing crosstalk to –90 dB |
| Package | 48-terminal TQFP (ST-48) - industry-standard footprint compatible with legacy PC audio layout libraries and reflow assembly |
| VREFOUT Drive | 2.25 V ±0.2 V, 5 mA - directly powers electret microphones without external bias circuitry |
Pinout & Package
AD1887JST is housed in a 48-pin Thin-Quad Flatpack (TQFP) package with exposed thermal pad (ST-48 option), rated for 0°C to 70°C operation. Pin 1 identifier located at top-left corner; no-connect pins explicitly defined in datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| XTL_IN / XTL_OUT | Clock oscillator interface | Accepts 24.576 MHz crystal; enables precise AC'97 timing without external clock generator |
| SDATA_IN / SDATA_OUT | AC'97 serial data I/O | Full-duplex 16-bit PCM data lanes synchronized to BIT_CLK/SYNC; supports daisy-chained topologies |
| BIT_CLK / SYNC | AC'97 frame timing | BIT_CLK = 12.288 MHz (256×48 kHz); SYNC = 48 kHz active-high frame sync - defines slot boundaries per AC'97 spec |
| HP_OUT_L / HP_OUT_R | Headphone driver outputs | Capable of 1 VRMS into 32 Ω; internally biased for DC-coupled output - reduces BOM count vs. AC-coupled alternatives |
| MIC_IN / VREFOUT | Microphone input & bias | VREFOUT provides 2.25 V mic bias; MIC_IN accepts 0.1–1 VRMS with 20 dB PGA gain - supports wide-range electret mics |
| CD_L / CD_R / CD_GND_REF | Differential CD audio input | Ground-referenced differential pair improves common-mode noise rejection on CD analog signals |
| ID0 / ID1 | Chip select inputs | Active-low dual-select encoding allows up to four AD1887 devices on same AC'97 bus - enables multi-codec configurations |
Key Features
| Feature | Design Value |
|---|---|
| AC'97 2.2 compliance | Guarantees interoperability with Intel 810/820 chipset-based host controllers and Windows audio stack without firmware patching |
| Mobile low-power mixer mode | Reduces analog supply current to 18.1 mA while maintaining CD path functionality - extends battery life in portable docking stations |
| Extended 6-bit headphone volume | –88.5 dB attenuation range in 1.5 dB steps - enables precise loudness matching across diverse headphone impedances and user preferences |
| Digital audio mixer mode | Software-configurable routing of LINE_IN, CD, MIC, and DAC outputs to ADC inputs - supports real-time monitoring and echo cancellation |
| Split 3.3 V / 5 V supplies | Independent DVDD and AVDD domains minimize digital switching noise coupling into analog audio paths - measured crosstalk ≤ –90 dB |
Applications
| Desktop PC Audio Subsystem | Legacy Industrial HMI Terminal |
|---|---|
|
Use Scenario: Integrated audio solution on ATX motherboard with front-panel headphone jack, rear-line-in/out, and onboard mic. IC Role / Device Role / Timing Role: Primary AC'97 codec interfacing with southbridge via AC-link; handles all analog-to-digital and digital-to-analog conversion. Use Value: Eliminates discrete op-amps and voltage references; leverages existing BIOS AC'97 initialization routines; supports Windows Plug-and-Play audio class drivers. |
Use Scenario: Operator interface in factory-floor HMIs requiring voice prompts, alarm tones, and microphone-based operator feedback. IC Role / Device Role / Timing Role: Audio interface between ARM-based controller and analog peripherals; operates in mobile low-power mixer mode during idle periods. Use Value: Enables local audio playback/recording without external codec ICs; VREFOUT powers electret mic directly; 48-TQFP simplifies PCB routing in space-constrained enclosures. |
| Embedded Media Player Baseboard | Legacy VoIP Phone Adapter |
|
Use Scenario: Add-on audio daughterboard for FPGA-based media player supporting CD-quality playback and line-in recording. IC Role / Device Role / Timing Role: Full-duplex audio transceiver with independent ADC/DAC clocks; configured via SPI-like AC-link register writes. Use Value: Provides 16-bit/48 kHz capability without FPGA logic overhead; integrated headphone amp drives 32 Ω cans directly; supports simultaneous playback and recording. |
Use Scenario: Analog telephone interface module converting PSTN audio to VoIP packets using legacy x86 gateway hardware. IC Role / Device Role / Timing Role: AC'97-compliant codec bridging analog FXS/FXO circuits to host processor's AC-link interface. Use Value: Maintains compatibility with aging VoIP stack firmware; >90 dB SNR ensures clear voice transmission; low-power states reduce thermal load in fanless enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar audio codec applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD1885JST | AC'97 2.1 compliant; lacks VREFOUT and mobile low-power mixer mode; identical 48-TQFP package and pinout | Targeted at cost-optimized desktop motherboards without mic bias or battery-powered operation | Select AD1885JST only if VREFOUT and LPMIX functionality are unused; register map differs in power-down control and ID registers |
| WM9705GDS | AC'97 2.2 compliant; includes touch-screen controller; requires separate mic bias circuit; 48-LQFP package with different pin assignment | Suitable for integrated PDA/media tablet designs where touchscreen + audio coexist on single SoC interface | WM9705GDS adds mixed-signal functionality but increases layout complexity; not pin-compatible - requires PCB redesign |
Compared with AD1885JST and WM9705GDS, the AD1887JST uniquely combines AC'97 2.2 compliance, integrated VREFOUT, and mobile low-power mixer mode in a drop-in-replaceable 48-TQFP package-making it the optimal choice for legacy audio subsystems requiring mic bias and extended power efficiency without architectural changes.
Availability
AD1887JST is available at Aetrix Electronics and suitable for desktop PC audio subsystems, industrial HMI terminals, embedded media player baseboards, and legacy VoIP phone adapters requiring stable component supply and long-term obsolescence management.
Supply support for AD1887JST 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and consumer markets since 1965.
The AD1887 belongs to Analog Devices' SoundMAX® AC'97 codec product line, designed specifically for PC and embedded platform audio subsystems requiring AC'97 2.x compliance, integrated analog front-end functionality, and robust noise immunity in mixed-signal environments.
FAQ
What is the operating temperature range for the AD1887JST?
The AD1887JST is specified for commercial-grade operation from 0°C to 70°C ambient temperature, as confirmed by the Ordering Guide section of the official datasheet. This range aligns with standard desktop PC and industrial control cabinet environments. The device's thermal resistance (θJA = 76.2°C/W) ensures reliable performance under typical 253 mW power dissipation at full operation. AD1887JST does not support extended or industrial temperature grades.
Does the AD1887JST support AC'97 2.2-compliant sample rate flexibility?
Yes, the AD1887JST fully supports AC'97 2.2 variable sample rates from 7040 Hz to 48 kHz in 1 Hz increments, as stated in the "ENHANCED FEATURES" section and verified in register 32h (PCM ADC Rate) and 2Ch (PCM DAC Rate) programming. This enables dynamic rate switching for voice (8 kHz), telephony (11.025 kHz), and CD-quality (44.1/48 kHz) streams without hardware reconfiguration. AD1887JST maintains timing compliance across the entire range.
How is microphone bias implemented on the AD1887JST?
The AD1887JST provides a dedicated VREFOUT pin (Pin 28) delivering 2.25 V ±0.2 V at up to 5 mA, explicitly intended for electret microphone bias. This eliminates external bias resistors or regulators. The MIC_IN pin (Pin 21) accepts signals from 0.1 VRMS (20 dB PGA gain) to 1 VRMS (0 dB gain), with programmable 0–22.5 dB PGA gain in 1.5 dB steps. AD1887JST's VREFOUT is enabled via register configuration and remains stable under load.
What power-down modes are available on the AD1887JST and how are they controlled?
The AD1887JST offers eight hardware-controllable power-down states via bits PR0–PR5 in register 26h (Power-Down Ctrl/Stat), including independent ADC-only, DAC-only, ADC+DAC, and ADC+DAC+Mixer modes. Current draw drops from 253 mW (active) to as low as 60 µA (standby). These modes are asserted by writing to register 26h; no external hardware control lines are required. AD1887JST's low-power mixer mode (LPMIX) retains CD path functionality while reducing analog supply current to 18.1 mA.
Is the AD1887JST pin-compatible with other AD188x-series codecs?
The AD1887JST shares identical 48-TQFP (ST-48) packaging and pinout with AD1885JST, as confirmed by matching Pin Configuration diagrams and PIN FUNCTION DESCRIPTIONS tables across both datasheets. However, functional differences exist: AD1887JST adds VREFOUT and LPMIX support, and its register map differs in reset behavior (Index 00h ID decoding) and power-down bit definitions. AD1887JST is not pin-compatible with AD1886 or AD1888 due to differing pin counts and assignments.
AD1887JST 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:
- 3.15V ~ 3.45V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-LQFP (7x7)
AD1887JST FAQ
1.How can I place an order for AD1887JST through Aetrix?
Please submit a Request for Quotation (RFQ) for AD1887JST 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 AD1887JST reliable?
The price and inventory of AD1887JST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD1887JST is usually 5 days.
3.What payment methods are accepted for AD1887JST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD1887JST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD1887JST?
AD1887JST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD1887JST 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 AD1887JST?
For technical support, including AD1887JST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD1887JST requirements.
6.How does Aetrix verify that AD1887JST is sourced from the original manufacturer or authorized distributors?
All AD1887JST 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 AD1887JST meets industry standards.
7.What is the process for return or replacement of AD1887JST?
All AD1887JST units undergo pre-shipment inspection (PSI). If there is an issue with AD1887JST, 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 AD1887JST part is unused and in its original packaging.
Return procedure for AD1887JST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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