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Analog Devices Inc. AD1887JST-REEL
- Part No.:
- AD1887JST-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- CODECS
- Package:
- 48-LQFP
- Datasheet:
-
AD1887JST-REEL.pdf
- Description:
- IC CODEC STEREO 16BIT 48-TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,720
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Product details
Overview
AD1887JST-REEL from Analog Devices is a 16-bit stereo full-duplex AC'97 2.2-compliant audio codec with integrated stereo headphone amplifier, programmable microphone preamp, and split 5 V analog / 3.3 V digital power supplies. It supports variable sample rates from 7040 Hz to 48 kHz (1 Hz resolution), delivers >90 dB dynamic range, and features 6-bit headphone volume control (–88.5 dB attenuation range) for PC audio subsystems.
For engineers reviewing the AD1887JST-REEL datasheet, AD1887JST-REEL pinout, AD1887JST-REEL application, or AD1887JST-REEL equivalent, key selection criteria include AC'97 link timing compliance, dual-supply operation, mic bias voltage generation (VREFOUT = 2.25 V, 5 mA), headphone drive capability (32 Ω load, 1 VRMS), and low-power mixer mode support.
Technical Context
The AD1887JST-REEL implements independent 16-bit ADC and DAC paths with multibit converter architecture, digital audio mixer, and software-enabled VREFOUT for microphone biasing. Its AC'97 interface uses BIT_CLK (12.288 MHz), SYNC (48 kHz frame sync), SDATA_IN/SDATA_OUT daisy-chain serial data, and RESET for hardware initialization.
It integrates analog input conditioning including PGA (0–22.5 dB gain, 1.5 dB steps), antialiasing filters (AFILT1/AFILT2), AC-coupling filters (FILT_L/FILT_R), and high-quality CD input with ground sense (CD_GND_REF). Power-down states are controlled via indexed register 26h (PR0–PR6 bits), enabling granular current reduction down to 60 µA standby.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit ADC/DAC - ensures CD-quality audio digitization and playback fidelity |
| Dynamic Range | >90 dB (A-weighted) - enables low-noise recording and playback in consumer audio systems |
| Sample Rate Range | 7040 Hz to 48 kHz with 1 Hz resolution - supports legacy telephony, VoIP, and full-bandwidth PCM audio |
| VREFOUT | 2.25 V ±0.2 V, 5 mA drive - powers external electret microphones without additional bias circuitry |
| Headphone Output | 1 VRMS into 32 Ω, –88.5 dB attenuation range - drives standard PC/headset headphones with precise volume control |
| Power Dissipation | 253 mW (5 V/3.3 V active), 60 µA standby - meets thermal and battery-life requirements in desktop and mobile platforms |
| AC'97 Compliance | AC'97 2.2 - guarantees interoperability with Intel chipset-based host controllers and system BIOS |
Pinout & Package
AD1887JST-REEL is housed in a 48-terminal Thin Quad Flatpack (TQFP) package (ST-48), with exposed thermal pad for enhanced heat dissipation in compact audio subsystem layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| HP_OUT_L / HP_OUT_R | Analog output | Direct-drive stereo headphone outputs capable of 1 VRMS into 32 Ω loads |
| MIC_IN | Analog input | Single-ended microphone input with programmable 0–30 dB boost and 0–22.5 dB PGA gain |
| CD_L / CD_R / CD_GND_REF | Analog input | Differential CD audio input with dedicated ground reference for noise rejection |
| LINE_IN_L / LINE_IN_R | Analog input | Stereo line-level inputs supporting up to 2.83 VP-P signals |
| VREFOUT | Analog output | 2.25 V bias supply for electret microphones; 5 mA drive strength eliminates external regulator |
| XTL_IN / XTL_OUT | Clock I/O | 24.576 MHz crystal oscillator interface for master clock generation |
| BIT_CLK / SYNC / SDATA_IN / SDATA_OUT | AC'97 digital interface | Standard AC'97 serial audio link signals; BIT_CLK = 12.288 MHz, SYNC = 48 kHz frame sync |
| RESET | Digital input | Active-low hardware reset initiating register initialization and cold-start sequence |
| ID0 / ID1 | Chip select | Hardware address pins defining device ID on AC'97 daisy chain (ID[1:0] = 00b default) |
| AVDD1/2/3, DVDD1/2, AVSS1/2/3, DVSS1/2 | Power/Ground | Split analog (5 V) and digital (3.3 V) supply domains with multiple pins for low-impedance routing and noise isolation |
Key Features
| Feature | Design Value |
|---|---|
| Full-duplex variable-rate audio | Simultaneous 16-bit ADC + DAC operation across 7040–48 kHz with 1 Hz granularity enables flexible sampling for VoIP, conferencing, and multimedia |
| Integrated headphone amplifier | On-chip stereo amplifier delivers 1 VRMS into 32 Ω with 6-bit volume control (±6 dB to –88.5 dB) - eliminates discrete op-amps and saves PCB area |
| Software-enabled VREFOUT | 2.25 V, 5 mA mic bias output controllable via register bit - simplifies electret mic integration and reduces BOM count |
| Mobile low-power mixer mode | LPMIX bit enables ultra-low-current operation (3.85 mA AVDD, 18.1 mA DVDD) while preserving analog CD path - extends battery life in portable designs |
| AC'97 2.2 compliance | Fully conforms to Intel AC'97 Rev 2.2 specification including timing, register map, and link protocol - ensures plug-and-play compatibility with industry-standard host controllers |
Applications
| Desktop PC Audio Subsystem | Embedded Voice Communication Terminal |
|---|---|
Use Scenario: Mainboard-integrated audio solution for consumer desktop PCs requiring Windows-compatible sound output and recording. IC Role / Device Role / Timing Role: AC'97 codec interfacing directly with Intel ICH southbridge via AC-link; provides ADC/DAC conversion, headphone amplification, and mic biasing. Use Value: Eliminates need for external audio controller ICs; supports simultaneous playback/recording at 48 kHz with >90 dB SNR for clear multimedia audio. | Use Scenario: Compact VoIP phone or conference speakerphone needing local audio processing and headset interface. IC Role / Device Role / Timing Role: Full-duplex audio transceiver handling mic input (with 30 dB boost), line-in mixing, and headphone/line-out playback synchronized to AC'97 frame timing. Use Value: Enables echo cancellation-ready signal paths; low-power mixer mode reduces idle current to <4 mA for always-on listening applications. |
| Legacy Industrial HMI Audio Interface | PC-Based Audio Test & Measurement Equipment |
Use Scenario: Human-machine interface panel with voice prompt playback and button-press audio feedback in factory automation systems. IC Role / Device Role / Timing Role: Standalone audio playback/recording peripheral using AC'97 link to embedded x86 controller; leverages VREFOUT for internal mic monitoring. Use Value: Provides robust 16-bit audio quality with industrial-grade temperature range (0°C to 70°C) and ESD-hardened I/O (4 kV HBM). | Use Scenario: Calibration-grade audio analyzer requiring precise analog input/output performance and stable clocking. IC Role / Device Role / Timing Role: Reference audio front-end with >90 dB dynamic range, low THD (–84 dB ADC, –75 dB DAC), and jitter-controlled BIT_CLK (750 ps typical). Use Value: Delivers measurement-grade linearity and noise floor; antialiasing filters (0.4×fS passband) ensure accurate spectral analysis up to 20 kHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar audio codec applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD1885JST | Same 48-TQFP package and AC'97 2.2 compliance; lacks VREFOUT and CD_GND_REF functionality | Not suitable for electret mic biasing or high-fidelity CD input; lower analog feature set | Select AD1887JST-REEL when mic bias generation or differential CD input is required |
| WM9705GDS | Wolfson AC'97 codec; 16-bit resolution, 48-TQFP, but requires external VREF and has no integrated headphone amp | Needs external op-amps for headphone drive and separate LDO for mic bias - increases BOM and layout complexity | Choose AD1887JST-REEL for integrated analog signal chain reducing component count and board space |
Compared with AD1885JST and WM9705GDS, AD1887JST-REEL uniquely combines VREFOUT, differential CD input, and integrated headphone amplification in a single AC'97 2.2-compliant device - delivering higher integration, lower system cost, and simplified design for PC and embedded audio endpoints.
Availability
AD1887JST-REEL is available at Aetrix Electronics and suitable for desktop PC motherboard design, VoIP terminal development, and industrial HMI audio subsystems requiring stable component supply and long-term manufacturability.
Supply support for AD1887JST-REEL 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 precision instrumentation, communications, and industrial markets.
The AD1887 belongs to Analog Devices' SoundMAX® AC'97 codec product line, engineered specifically for cost-sensitive, high-fidelity PC and embedded audio applications requiring AC'97 2.2 compliance and integrated analog front-end functionality.
FAQ
What is the operating temperature range for the AD1887JST-REEL?
The AD1887JST-REEL is rated for commercial operation from 0°C to 70°C ambient temperature, as specified in the Ordering Guide. This range aligns with standard desktop PC and industrial embedded environments where airflow and thermal management meet typical TQFP package dissipation limits (θJA = 76.2°C/W).
Does the AD1887JST-REEL support AC'97 2.1 and 2.2 specifications?
Yes, the AD1887JST-REEL is explicitly AC'97 2.2 compliant and retains backward compatibility with AC'97 2.1 features including variable sample rate audio, extended 6-bit headphone volume control, and digital audio mixer mode - all verified in the functional description and register map.
Can the AD1887JST-REEL drive standard 32 Ω headphones directly?
Yes, the AD1887JST-REEL integrates a stereo headphone amplifier capable of delivering 1 VRMS into a 32 Ω load per channel, as confirmed by the "ANALOG OUTPUT" specification table. No external amplification is required for typical PC headsets or consumer headphones.
What is the purpose of the VREFOUT pin on the AD1887JST-REEL?
The VREFOUT pin on the AD1887JST-REEL provides a regulated 2.25 V ±0.2 V output with 5 mA drive capability, designed specifically to bias electret condenser microphones. This eliminates the need for an external voltage reference or LDO in microphone interface circuits.
How does the AD1887JST-REEL handle power management in low-power modes?
The AD1887JST-REEL implements granular power-down control via register 26h (PR0–PR6 bits), enabling independent shutdown of ADC, DAC, mixer, and analog CD paths. In full standby (all PR bits set), it draws only 60 µA from AVDD and zero from DVDD - verified in the POWER-DOWN STATES table.
AD1887JST-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- SoundMAX®
- Package/Case:
- 48-LQFP
- Packaging:
- Bulk
- 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-REEL FAQ
1.How can I place an order for AD1887JST-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD1887JST-REEL 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-REEL reliable?
The price and inventory of AD1887JST-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD1887JST-REEL is usually 5 days.
3.What payment methods are accepted for AD1887JST-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD1887JST-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD1887JST-REEL?
AD1887JST-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD1887JST-REEL 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-REEL?
For technical support, including AD1887JST-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD1887JST-REEL requirements.
6.How does Aetrix verify that AD1887JST-REEL is sourced from the original manufacturer or authorized distributors?
All AD1887JST-REEL 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-REEL meets industry standards.
7.What is the process for return or replacement of AD1887JST-REEL?
All AD1887JST-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD1887JST-REEL, 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-REEL part is unused and in its original packaging.
Return procedure for AD1887JST-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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