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Analog Devices Inc. AD1881AJSTZ
- Part No.:
- AD1881AJSTZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- CODECS
- Package:
- 48-LQFP
- Datasheet:
-
AD1881AJSTZ.pdf
- Description:
- IC AUDIO CODEC AC'97 48-LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:6,467
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Product details
Overview
AD1881AJSTZ from Analog Devices is a 16-bit stereo full-duplex AC'97 2.1-compliant audio codec IC designed as the analog front end for PC and notebook audio subsystems. It integrates dual Σ∆ ADCs and DACs, analog mixer with independent +12 dB to –34.5 dB gain/attenuation per channel, PHAT™ 3D stereo enhancement, and true line-level outputs. It supports variable sample rates from 8 kHz to 48 kHz (1 Hz resolution) and operates with split supplies (5 V analog / 3.3 V digital).
For engineers reviewing the AD1881AJSTZ datasheet, AD1881AJSTZ pinout, AD1881AJSTZ application, or AD1881AJSTZ equivalent, this page delivers verified functional context, validated AC'97 interface timing, confirmed 48-lead LQFP package mapping, and real-world audio subsystem integration guidance - including mixer mode operation, power-down state behavior, and PHAT stereo enhancement capacitor configuration.
Technical Context
The AD1881AJSTZ implements an AC'97-compliant serial interface with BIT_CLK (12.288 MHz), SYNC (48 kHz frame sync), SDATA_IN, and SDATA_OUT signals, supporting daisy-chain topology. Its analog signal path includes programmable gain amplifiers (0 dB to +22.5 dB in 1.5 dB steps) preceding 16-bit Σ∆ converters and decimation/interpolation filters with ±0.09 dB passband ripple and –74 dB stopband rejection.
It features dedicated hardware support for host-based echo cancellation via time-correlated I/O (MIC on left ADC channel, mono-summed DAC output on right), mobile low-power mixer mode, and Digital Audio Mode (DAM) enabling simultaneous capture/playback at different sample rates. The PHAT™ stereo enhancement uses external CX3D/RX3D capacitors for 3D spatial processing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit ADC/DAC - ensures CD-quality audio fidelity with 90 dB SNR and A-weighted dynamic range ≥87 dB (ADC) / ≥90 dB (DAC) |
| Sample Rate Range | 8 kHz to 48 kHz with 1 Hz resolution - enables flexible audio I/O for voice, telephony, and multimedia without resampling artifacts |
| THD+N | 0.02% (–74 dB) - meets high-fidelity PC audio requirements with minimal harmonic distortion in both conversion directions |
| Power Dissipation | 280 mW typical (5 V/3.3 V) - supports thermal design in space-constrained notebook and docking station PCBs |
| Supply Voltages | 5.0 V analog (AVDD1/AVDD2), 3.3 V digital (DVDD1/DVDD2) - enables clean separation of analog and digital domains to minimize noise coupling |
| Package | 48-lead LQFP (ST-48) - surface-mount footprint compatible with standard reflow processes and IPC-7351B land patterns |
| Operating Temperature | 0°C to +70°C - qualified for commercial desktop, laptop, and peripheral audio applications |
Pinout & Package
AD1881AJSTZ is housed in a 48-lead LQFP (ST-48) package with exposed thermal pad (θJA = 76.2°C/W). Pin 1 identifier located at top-left corner; pins numbered counterclockwise. Analog and digital grounds are segregated (AVSS1/AVSS2, DVSS1/DVSS2) to maintain PSRR >40 dB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| XTL_IN (Pin 2) | Clock Input | 24.576 MHz crystal or clock source input; drives internal PLL for BIT_CLK and sample rate generation |
| BIT_CLK (Pin 6) | AC-Link Bit Clock Output | 12.288 MHz CMOS clock; jitter ≤750 ps RMS; used by host controller to synchronize serial data frames |
| SYNC (Pin 10) | AC-Link Frame Sync Input | 48 kHz active-high frame boundary signal; defines start of each 256-bit AC-Link frame |
| SDATA_IN (Pin 8) | AC-Link Data Input | Host-to-codec serial stream carrying DAC data, control words, and PCM output; sampled on falling BIT_CLK edge |
| SDATA_OUT (Pin 5) | AC-Link Data Output | Codec-to-host serial stream carrying ADC data and status; driven on rising BIT_CLK edge |
| LINE_OUT_L/R (Pins 35/36) | Analog Output | True line-level (1 VRMS, 2.83 VP-P) stereo outputs; independent master volume control; unaffected by DAC mute |
| EAPD (Pin 47) | Control Output | External amplifier power-down signal; active-HI, default LO; synchronizes analog output stage shutdown during sleep |
| VREFOUT (Pin 28) | Reference Output | 2.2 V bias voltage with 5 mA drive capability; intended for MIC1/MIC2 biasing in electret microphone interfaces |
Key Features
| Feature | Design Value |
|---|---|
| PHAT™ Stereo 3D Enhancement | Hardware-accelerated spatial audio processing using external CX3D/RX3D capacitor network; no host CPU overhead |
| True Line-Level Outputs | Fixed-amplitude LINE_OUT_L/R outputs (1 VRMS) independent of master volume setting - essential for docking stations and home theater passthrough |
| Digital Audio Mode (DAM) | Enables analog mixing of inputs (MIC, LINE, CD, etc.) directly to ADC without DAC involvement - critical for simultaneous record/playback at mismatched sample rates |
| Host-Based Echo Cancellation Support | Left ADC channel carries MIC signal; right ADC channel carries mono-summed DAC output - enables software echo cancellation with precise time correlation |
| Mobile Low Power Mixer Mode | Reduces current draw to 4 mA (ADC+DAC+Mixer) or 0.1 mA (standby) - meets ACPI S3/S4 power states for notebooks |
Applications
| Desktop PC Audio Subsystem | Notebook Docking Station |
|---|---|
|
Use Scenario: Mainboard-integrated audio for Windows-based desktops requiring AC'97 compliance and SoundMAX branding. IC Role / Device Role / Timing Role: Analog front-end codec interfacing with Intel 82801 ICH southbridge via AC-Link; provides all analog I/O (MIC, LINE, CD, PHONE) and stereo DAC/ADC conversion. Use Value: Delivers 90 dB SNR and <0.02% THD+N for CD playback and recording; supports BIOS POST beep via unmuted PC_BEEP path even during RESET assertion. |
Use Scenario: Audio expansion in modular docking stations where line-out stability and low-noise analog routing are critical. IC Role / Device Role / Timing Role: Provides true line-level outputs (LINE_OUT_L/R) that remain constant across master volume settings, enabling direct connection to external AV receivers. Use Value: Eliminates need for external level-shifting or buffering; supports hot-plug detection via EAPD-controlled amplifier enable/disable sequencing. |
| Telephony Speakerphone Interface | PC-Based Voice Communication System |
|
Use Scenario: Integrated speakerphone in all-in-one PCs or VoIP appliances requiring full-duplex hands-free operation. IC Role / Device Role / Timing Role: Routes PHONE_IN to ADC and MONO_OUT to speaker; uses PHAT™ enhancement to widen perceived audio image; supports echo cancellation via correlated left/right ADC streams. Use Value: Enables software echo cancellation with <1 µs inter-channel skew; analog mixer allows local monitoring of MIC without host intervention. |
Use Scenario: Real-time voice chat, conferencing, or speech recognition systems requiring simultaneous capture and playback at different rates. IC Role / Device Role / Timing Role: Uses Digital Audio Mode (DAM) to mix analog inputs (MIC, LINE) directly to ADC while DAC plays back at 48 kHz - no sample-rate conversion required. Use Value: Reduces host CPU load and eliminates resampling artifacts; supports 8 kHz telephony capture and 44.1 kHz music playback concurrently. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar audio codec applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD1885JSTZ | Successor with enhanced 20-bit ADC/DAC option, wider PGA range (+30 dB), and improved THD+N (–85 dB); same 48-LQFP footprint and AC'97 register map | Targeted at premium desktop audio and professional capture where extended dynamic range and lower distortion are required | Select AD1885JSTZ when upgrading legacy designs needing higher resolution or when new designs require future-proofing beyond AC'97 2.1 baseline |
| WM9705GED | Wolfson single-chip AC'97 codec; identical 48-LQFP package but different pinout (e.g., no dedicated PHAT pins); 16-bit resolution, 90 dB SNR, 8–48 kHz sample rate | Used in embedded x86 platforms where Wolfson driver stack compatibility is mandated; lacks PHAT™ and true line-level output independence | Choose WM9705GED only if existing firmware/driver infrastructure is tightly coupled to Wolfson register definitions and PHAT™ is not required |
Compared with AD1881AJSTZ, AD1885JSTZ offers measurable SNR and resolution improvements while maintaining pin and software compatibility, whereas WM9705GED requires PCB redesign and driver adaptation despite matching core AC'97 functionality.
Availability
AD1881AJSTZ is available at Aetrix Electronics and suitable for desktop motherboard design, notebook docking station integration, telephony speakerphone subsystems, and PC-based voice communication systems requiring stable component supply and long-term industrial availability.
Supply support for AD1881AJSTZ 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 AD1881A belongs to Analog Devices' SoundMAX® AC'97 codec product line, engineered specifically for cost-sensitive, high-fidelity PC audio applications requiring AC'97 2.1 compliance, low power consumption, and integrated analog mixing.
FAQ
What is the primary function of the AD1881AJSTZ in an AC'97 audio system?
The AD1881AJSTZ serves as the analog front-end component in an AC'97-compliant audio architecture, performing 16-bit stereo analog-to-digital and digital-to-analog conversion, analog mixing of up to seven input sources (MIC, LINE, CD, AUX, VIDEO, PHONE, PC_BEEP), and delivering true line-level outputs. It interfaces with a digital audio controller (e.g., Intel ICH) via the AC-Link serial bus and handles all analog signal conditioning, gain control, and PHAT™ stereo enhancement internally.
Does the AD1881AJSTZ support variable sample rates, and how is this implemented?
Yes, the AD1881AJSTZ supports variable sample rates from 8 kHz to 48 kHz with 1 Hz resolution. This is achieved through on-chip sample rate generators and Data Direct Scrambling (D2S) circuitry that dynamically adjusts converter timing without external components. The PCM DAC Rate (register 0x2C) and PCM ADC Rate (register 0x32) allow independent programming of playback and capture rates, enabling simultaneous operation at mismatched frequencies - a key requirement for voice+music applications.
How does the PHAT™ Stereo 3D enhancement work in the AD1881AJSTZ, and what external components are required?
The PHAT™ Stereo 3D enhancement in the AD1881AJSTZ is implemented via dedicated analog circuitry that processes left/right channel signals using external passive components. It requires two external capacitors: CX3D (connected to Pin 34) and RX3D (connected to Pin 33). These form part of a frequency-dependent phase-shift network that creates perceptual spatial widening. Configuration is controlled via bit 13 ("3D") in the General Purpose register (0x20); no host processor involvement is needed once enabled.
What is the purpose of the EAPD pin on the AD1881AJSTZ, and how is it used in power management?
The EAPD (External Amplifier Power-Down) pin (Pin 47) on the AD1881AJSTZ is an active-HIGH open-drain output that controls external audio power amplifiers. During normal operation, it remains LOW; asserting it HIGH disables the amplifier to prevent pop/click during sleep transitions. In power-down modes (e.g., PR2, PR1, PR0 set), EAPD goes HIGH automatically, synchronizing analog output stage shutdown with codec idle states - a critical feature for meeting ACPI S3/S4 compliance in notebook platforms.
Can the AD1881AJSTZ be used in systems requiring true line-level output independent of master volume control?
Yes, the AD1881AJSTZ provides true line-level outputs on LINE_OUT_L (Pin 35) and LINE_OUT_R (Pin 36), each delivering a fixed 1 VRMS (2.83 VP-P) signal regardless of master volume register settings. This is achieved by routing the DAC output through a separate, unattenuated path before the master volume stage. This design enables reliable connection to external AV equipment without level drift, making AD1881AJSTZ suitable for docking stations and home theater PC applications where consistent output amplitude is mandatory.
AD1881AJSTZ 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:
- 90 / 90
- 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)
AD1881AJSTZ FAQ
1.How can I place an order for AD1881AJSTZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD1881AJSTZ 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 AD1881AJSTZ reliable?
The price and inventory of AD1881AJSTZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD1881AJSTZ is usually 5 days.
3.What payment methods are accepted for AD1881AJSTZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD1881AJSTZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD1881AJSTZ?
AD1881AJSTZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD1881AJSTZ 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 AD1881AJSTZ?
For technical support, including AD1881AJSTZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD1881AJSTZ requirements.
6.How does Aetrix verify that AD1881AJSTZ is sourced from the original manufacturer or authorized distributors?
All AD1881AJSTZ 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 AD1881AJSTZ meets industry standards.
7.What is the process for return or replacement of AD1881AJSTZ?
All AD1881AJSTZ units undergo pre-shipment inspection (PSI). If there is an issue with AD1881AJSTZ, 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 AD1881AJSTZ part is unused and in its original packaging.
Return procedure for AD1881AJSTZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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