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Analog Devices Inc. AD1887JSTZ
- Part No.:
- AD1887JSTZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- CODECS
- Package:
- 48-LQFP
- Datasheet:
-
AD1887JSTZ.pdf
- Description:
- IC CODEC STEREO 16BIT 48-TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,528
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Product details
Overview
AD1887JSTZ from Analog Devices is a 16-bit stereo full-duplex AC'97 2.2-compliant audio codec IC with integrated stereo 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 6-bit headphone volume control (–94.5 dB span) for PC audio subsystems and legacy desktop motherboard designs.
For engineers reviewing the AD1887JSTZ datasheet, AD1887JSTZ pinout, AD1887JSTZ application, or AD1887JSTZ equivalent, key selection criteria include AC'97 2.2 interface compliance, dual-supply operation (3.3 V DVDD / 5 V AVDD), TQFP-48 package compatibility, and support for CD/LINE_IN/MIC analog inputs with independent gain/attenuation control.
Technical Context
The AD1887JSTZ implements separate multibit Σ-Δ ADC and DAC architectures with digital decimation/interpolation filters (passband 0–0.4×fS, stopband rejection –74 dB), enabling high-fidelity audio conversion. Its AC'97 link interface uses BIT_CLK (12.288 MHz), SYNC (48 kHz frame sync), SDATA_IN/SDATA_OUT, and RESET for host controller communication.
On-chip analog functions include a software-enabled VREFOUT (2.25 V, 5 mA) for microphone bias, programmable PGA (0–22.5 dB in 1.5 dB steps), and analog mixer with ±46.5 dB input gain/attenuation range across MIC, LINE_IN, CD, and DAC paths - all configurable via indexed 16-bit registers over the AC'97 serial interface.
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) - meets AC'97 2.2 specification for low-noise analog signal path |
| Sample Rate Range | 7040 Hz to 48 kHz with 1 Hz resolution - supports legacy and standard PC audio sampling |
| Analog Supplies | 5.0 V AVDD / 3.3 V DVDD - enables independent noise isolation between analog and digital domains |
| Headphone Output | ±1 V RMS full-scale into 32 Ω, 6-bit volume control (–94.5 dB span) - drives headphones directly without external amplification |
| Power Dissipation | 253 mW typical at 48 kHz - optimized for desktop motherboard thermal budgets |
| VREFOUT | 2.25 V ±0.2 V, 5 mA drive - powers electret microphones and external analog circuitry |
Pinout & Package
AD1887JSTZ is housed in a 48-terminal Thin Quad Flatpack (TQFP) package with exposed thermal pad (ST-48 option), rated for 0°C to 70°C ambient operation. Pin 1 identifier located at top-left corner; no-connect (NC) pins are explicitly defined in datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| XTL_IN / XTL_OUT | Clock oscillator interface | Accepts 24.576 MHz crystal input; provides buffered output for system clock distribution |
| SDATA_IN / SDATA_OUT | AC'97 serial data I/O | Full-duplex PCM data stream interface with slot-based framing (SLOT1/SLOT2) |
| BIT_CLK / SYNC / RESET | AC'97 timing and control | 12.288 MHz bit clock, 48 kHz frame sync, and active-low hardware reset for link initialization |
| HP_OUT_L / HP_OUT_R | Analog output drivers | Capable of ±1 V RMS into 32 Ω loads; integrated DC-blocking capacitors supported via FILT_L/FILT_R pins |
| MIC / LINE_IN_L / LINE_IN_R / CD_L / CD_R | Analog input channels | Dedicated differential-capable inputs with programmable PGA (MIC) and ground-reference (CD_GND_REF) for noise immunity |
| VREFOUT / VREF | Reference voltage outputs | VREFOUT supplies 2.25 V bias to microphones; VREF provides internal reference filter node |
Key Features
| Feature | Design Value |
|---|---|
| AC'97 2.2 Compliance | Guarantees interoperability with Intel AC'97 host controllers and audio codecs in legacy PC platforms |
| Mobile Low-Power Mixer Mode | Reduces total supply current to 3.80 mA (DVDD) / 2.1 mA (AVDD) when ADC+DAC+mixer active |
| Extended Headphone Volume Control | 6-bit resolution (1.5 dB/step) enables precise attenuation from +6 dB to –88.5 dB per channel |
| Software-Enabled VREFOUT | Configurable 2.25 V output with 5 mA drive eliminates need for external mic bias circuitry |
| Digital Audio Mixer Mode | Enables real-time mixing of PCM playback, MIC, LINE_IN, and CD sources before DAC output |
Applications
| Desktop Motherboard Audio Subsystem | Legacy PC Sound Card |
|---|---|
Use Scenario: Integrated audio solution on ATX/BTX motherboards requiring AC'97 2.2 compliance and minimal BOM count. IC Role / Device Role / Timing Role: Primary AC'97 codec handling ADC capture (MIC/LINE/CD) and DAC playback (PCM) with host CPU via AC-link interface. Use Value: Eliminates discrete op-amps and voltage references; reduces layout complexity with integrated headphone amp and VREFOUT. |
Use Scenario: Replacement audio codec for OEM sound cards using AC'97 architecture and requiring drop-in compatibility. IC Role / Device Role / Timing Role: Full-duplex stereo codec providing synchronized 16-bit audio conversion at 44.1/48 kHz sample rates. Use Value: Maintains identical register map and timing behavior as AD1881/AD1885, enabling firmware reuse and PCB-level compatibility. |
| Industrial HMI Audio Interface | Embedded Test Equipment Audio I/O |
Use Scenario: Audio feedback and voice recording in ruggedized human-machine interfaces with extended temperature tolerance. IC Role / Device Role / Timing Role: Audio front-end processing analog signals from microphones and line-level sources before digitization. Use Value: >90 dB SNR and programmable PGA ensure clean capture of low-level industrial audio signals amid EMI. |
Use Scenario: Calibration-grade audio I/O module for automated test systems requiring stable analog performance. IC Role / Device Role / Timing Role: Precision 16-bit ADC/DAC with tight gain matching (±0.5 dB interchannel) and low THD (–84 dB). Use Value: Enables traceable audio signal generation and measurement without external calibration components. |
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 |
|---|---|---|---|
| AD1885JSTZ | Same 48-pin TQFP package; lacks VREFOUT and mobile low-power mixer mode; lower power-down current (1.2 mA vs 2.1 mA) | Targeted at cost-sensitive desktop boards where mic bias and ultra-low standby not required | Select AD1885JSTZ only if VREFOUT and LPMIX functionality are unused; verify register compatibility for existing firmware |
| AK4531VN | AC'97 2.1-compliant; 32-pin QFP; no integrated headphone amp; requires external VREF | Used in space-constrained embedded systems where external amplification is acceptable | Choose AK4531VN when board area is critical and analog output buffering is handled externally |
Compared with AD1885JSTZ and AK4531VN, AD1887JSTZ uniquely integrates VREFOUT and a low-power mixer mode while maintaining full AC'97 2.2 compliance and headphone drive capability - making it optimal for legacy PC audio designs requiring self-contained analog signal conditioning.
Availability
AD1887JSTZ is available at Aetrix Electronics and suitable for desktop motherboard audio subsystems, legacy PC sound cards, and industrial HMI audio interfaces requiring stable component supply and long-term obsolescence management.
Supply support for AD1887JSTZ 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' AC'97 audio codec product line, designed specifically to meet Intel's AC'97 2.2 specification for PC platform audio subsystems with integrated analog front-end functionality.
FAQ
What is the operating temperature range for AD1887JSTZ?
The AD1887JSTZ is specified for commercial temperature operation from 0°C to 70°C ambient. This range aligns with standard desktop motherboard thermal environments and is validated per the ordering guide for the JSTZ grade. Thermal resistance values (θJA = 76.2°C/W) support reliable operation under typical 253 mW power dissipation conditions.
Does AD1887JSTZ support AC'97 2.2-compliant sample rate switching?
Yes, AD1887JSTZ fully supports AC'97 2.2 variable sample rate operation from 7040 Hz to 48 kHz in 1 Hz increments via its programmable sample rate generators. The device implements the required AC'97 2.2 register set (SR0/SR1) and maintains timing compliance across all supported rates, including non-standard frequencies used in legacy multimedia applications.
Can AD1887JSTZ drive headphones directly without external amplification?
Yes, AD1887JSTZ integrates a stereo headphone amplifier capable of delivering ±1 V RMS (2.83 V p-p) into 32 Ω loads. Its 6-bit volume control (1.5 dB/step, –94.5 dB span) and mute function enable direct connection to standard PC headphones without additional buffer stages or passive components.
What is the purpose of the VREFOUT pin on AD1887JSTZ?
The VREFOUT pin on AD1887JSTZ provides a regulated 2.25 V ±0.2 V output with 5 mA drive capability, intended to bias electret condenser microphones. This eliminates the need for external voltage dividers or regulators in MIC input circuits, simplifying design and improving noise immunity in audio capture paths.
How does AD1887JSTZ handle power management in low-power modes?
AD1887JSTZ implements granular power-down control via the Power-Down Control/Status register (Index 26h). Individual blocks - ADC, DAC, mixer, and analog CD path - can be disabled to reduce current draw, achieving as low as 0.06 mA (DVDD) / 0 mA (AVDD) in full standby mode while retaining register state and AC-link readiness.
AD1887JSTZ 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 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)
AD1887JSTZ FAQ
1.How can I place an order for AD1887JSTZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD1887JSTZ 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 AD1887JSTZ reliable?
The price and inventory of AD1887JSTZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD1887JSTZ is usually 5 days.
3.What payment methods are accepted for AD1887JSTZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD1887JSTZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD1887JSTZ?
AD1887JSTZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD1887JSTZ 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 AD1887JSTZ?
For technical support, including AD1887JSTZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD1887JSTZ requirements.
6.How does Aetrix verify that AD1887JSTZ is sourced from the original manufacturer or authorized distributors?
All AD1887JSTZ 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 AD1887JSTZ meets industry standards.
7.What is the process for return or replacement of AD1887JSTZ?
All AD1887JSTZ units undergo pre-shipment inspection (PSI). If there is an issue with AD1887JSTZ, 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 AD1887JSTZ part is unused and in its original packaging.
Return procedure for AD1887JSTZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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