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Analog Devices Inc. AD1887JSTZ-REEL
- Part No.:
- AD1887JSTZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- CODECS
- Package:
- 48-LQFP
- Datasheet:
-
AD1887JSTZ-REEL.pdf
- Description:
- IC CODEC STEREO 16BIT 48-TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
AD1887JSTZ-REEL 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 is used in legacy PC motherboard audio subsystems requiring AC-Link interface compliance and low-power mixer operation.
For engineers reviewing the AD1887JSTZ-REEL datasheet, AD1887JSTZ-REEL pinout, AD1887JSTZ-REEL application, or AD1887JSTZ-REEL equivalent, key selection criteria include AC'97 2.2 timing compliance, 48-TQFP package compatibility, dual-supply rail support (3.3 V DVDD / 5 V AVDD), headphone output drive capability (±1 Vrms into 32 Ω), and register-mapped power-down control (PR0–PR6 bits).
Technical Context
The AD1887JSTZ-REEL implements a multibit ΔΣ converter architecture for both ADC and DAC paths, achieving >90 dB SNR and A-weighted dynamic range of 84–90 dB. Its AC-Link interface operates at 12.288 MHz BIT_CLK with guaranteed setup/hold timing and frame-sync alignment per AC'97 2.2 specification.
It integrates three independent analog input paths (MIC, LINE_IN, CD) with programmable gain amplifiers (0–22.5 dB in 1.5 dB steps), analog mixing, and digital volume control across all signal paths. Power management includes seven discrete power-down states controlled via indexed register 26h (PR0–PR5), enabling sub-4 mA total supply current in full-suspend mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit ADC/DAC - Ensures CD-quality audio digitization and playback without dithering artifacts in standard PC audio applications. |
| Dynamic Range (A-weighted) | 84–90 dB - Meets AC'97 high-fidelity audio requirements; enables clean headphone output with minimal background noise. |
| Sample Rate Range | 7040 Hz to 48 kHz (1 Hz resolution) - Supports legacy telephony (8 kHz), voice (11.025 kHz), CD (44.1 kHz), and DAT (48 kHz) sampling without external PLL. |
| Headphone Output | ±1 Vrms (2.83 Vpp) into 32 Ω - Drives standard consumer headphones directly; eliminates need for external buffer stage. |
| Power Supply | 3.3 V DVDD / 5 V AVDD - Enables separation of digital noise-sensitive analog circuitry; requires two independent LDOs or DC-DC converters. |
| Package | 48-terminal TQFP (ST-48) - Standard footprint compatible with legacy motherboard layouts; thermal resistance θJA = 76.2°C/W. |
| VREFOUT Drive | 2.25 V ±0.2 V, 5 mA - Supplies stable bias voltage for electret condenser microphones; eliminates external regulator in cost-sensitive designs. |
Pinout & Package
AD1887JSTZ-REEL is housed in a 48-pin Thin-Quad Flatpack (TQFP) package with exposed thermal pad (ST-48). Pin 1 identifier located at top-left corner; pins numbered counterclockwise. Ground and power pins are distributed across four sides to minimize supply impedance and crosstalk.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| XTL_IN / XTL_OUT | Clock oscillator interface | Accepts 24.576 MHz crystal; drives internal PLL to generate AC-Link timing - no external clock generator required. |
| SDATA_IN / SDATA_OUT | AC-Link serial data I/O | Full-duplex 16-bit PCM data lanes; aligned to BIT_CLK and SYNC - connects directly to host AC'97 controller (e.g., Intel ICH). |
| HP_OUT_L / HP_OUT_R | Headphone driver outputs | Capable of ±1 Vrms into 32 Ω load; internally biased - requires only AC-coupling capacitors to headphones. |
| MIC / CD_L / CD_R / LINE_IN_L / LINE_IN_R | Analog audio inputs | Dedicated differential-capable inputs with programmable PGA gain - supports electret mic, line-level, and CD player sources simultaneously. |
| VREFOUT | Mic bias reference output | 2.25 V regulated output with 5 mA drive - powers electret microphones without external bias resistor or regulator. |
| ID0 / ID1 | Chip select inputs | Active-low dual-select logic - enables multi-codec configurations on shared AC-Link bus (e.g., modem + audio). |
Key Features
| Feature | Design Value |
|---|---|
| AC'97 2.2 compliance | Fully implements AC-Link protocol timing, register map, and power-down state definitions - ensures interoperability with Intel ICH and compatible host controllers. |
| Mobile low-power mixer mode | Enables analog CD path while powering down ADC/DAC - reduces active current to 3.85 mA (DVDD) / 18.1 mA (AVDD) for background audio monitoring. |
| 6-bit headphone volume control | +6 dB to –88.5 dB attenuation in 1.5 dB steps - provides precise loudness matching across diverse headphone impedances and listening environments. |
| Programmable microphone preamp | 0–30 dB gain (M30 bit + MCV[4:0]) with mute - accommodates wide-range electret mic sensitivities without external op-amp stages. |
| Digital audio mixer mode | Independent left/right gain/attenuation (±46.5 dB, 1.5 dB steps) for MIC/LINE_IN/CD/DAC paths - enables real-time analog source mixing before ADC conversion. |
Applications
| Desktop PC Audio Subsystem | Legacy Industrial HMI Terminal |
|---|---|
|
Use Scenario: Integrated audio solution on ATX motherboard with AC'97-compliant southbridge (e.g., Intel ICH4). IC Role / Device Role / Timing Role: Primary AC'97 codec interfacing via AC-Link; handles analog input conditioning, stereo DAC output, and headphone amplification. Use Value: Eliminates need for discrete op-amps, regulators, and clock synthesizers - reduces BOM count by ≥7 components versus discrete implementation. |
Use Scenario: Operator interface panel with voice prompt playback and microphone input for local command entry. IC Role / Device Role / Timing Role: Audio interface between ARM-based HMI controller and front-panel headset jack; operates in low-power mixer mode during standby. Use Value: Achieves <4 mA total supply current in mixed analog/digital suspend state - extends battery life in portable industrial terminals. |
| Embedded Modem-Audio Combo Card | Legacy Point-of-Sale System |
|
Use Scenario: Dual-function PCI card supporting dial-up modem and speaker/mic audio using shared AC-Link bus. IC Role / Device Role / Timing Role: Secondary AC'97 codec selected via ID0/ID1 pins; shares BIT_CLK/SYNC with primary modem codec. Use Value: Enables concurrent modem handshake and audio playback using single AC-Link physical layer - avoids PCIe or USB audio bridge complexity. |
Use Scenario: Cash register system requiring audible transaction feedback and customer-facing voice prompts. IC Role / Device Role / Timing Role: Standalone audio playback engine driven by parallel GPIO-controlled register writes; uses internal oscillator. Use Value: Delivers 90 dB SNR playback from compact SPI-configured flash memory - meets EN 55032 Class B EMI limits without shielding. |
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-REEL | Same 48-TQFP package and AC'97 2.2 register map; lacks VREFOUT and CD_GND_REF pins; reduced analog input count (no dedicated CD path). | Targeted at cost-optimized desktop audio where CD input is unused; cannot replace AD1887JSTZ-REEL in systems requiring differential CD input or mic bias. | Select only if CD input and VREFOUT are unnecessary; verify register compatibility for power-down and mixer control. |
| Crystal Semiconductor CS4297A-KQZ | Pin-compatible 48-TQFP; AC'97 2.2 compliant; identical BIT_CLK/SYNC timing; supports same 7040–48 kHz sample rates. | Offers enhanced 94 dB SNR and 20-bit oversampling mode; requires different reset initialization sequence and lacks mobile low-power mixer mode. | Use when higher dynamic range is critical; revalidate AC-Link timing margins and power-down register behavior in target host firmware. |
Compared with AD1885JSTZ-REEL and CS4297A-KQZ, the AD1887JSTZ-REEL uniquely combines CD differential input support, integrated VREFOUT, and mobile low-power mixer mode - making it irreplaceable in legacy PC audio designs requiring full AC'97 feature set and analog flexibility.
Availability
AD1887JSTZ-REEL is available at Aetrix Electronics and suitable for desktop PC motherboard production, industrial HMI terminal upgrades, and legacy point-of-sale system refurbishment requiring stable component supply and long-term obsolescence mitigation.
Supply support for AD1887JSTZ-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, founded in 1965 and headquartered in Norwood, MA.
The AD1887 belongs to Analog Devices' legacy AC'97 audio codec product line, designed specifically for PC platform integration with Intel ICH-class southbridges and backward-compatible with Windows 98/2000/XP audio drivers.
FAQ
What is the maximum supported sample rate for AD1887JSTZ-REEL?
The AD1887JSTZ-REEL supports variable sample rates from 7040 Hz up to 48 kHz in 1 Hz increments, as confirmed in the "ENHANCED FEATURES" section and verified in the "PCM DAC Rate (SR1)" and "PCM ADC Rate (SR0)" register descriptions (pages 8–9). This range covers all standard AC'97 audio formats including telephony, voice, CD, and DAT.
Does AD1887JSTZ-REEL require an external crystal oscillator?
Yes, the AD1887JSTZ-REEL requires a 24.576 MHz fundamental-mode crystal connected between XTL_IN (pin 2) and XTL_OUT (pin 3). The device contains internal oscillator circuitry but does not accept external clock signals - the crystal is mandatory for AC-Link timing generation and cannot be replaced with a CMOS clock source.
Can AD1887JSTZ-REEL drive standard 32 Ω headphones directly?
Yes, the AD1887JSTZ-REEL integrates stereo headphone amplifiers capable of delivering ±1 Vrms (2.83 Vpp) into a 32 Ω load, as specified in the "ANALOG OUTPUT" table (page 3). No external buffer or amplifier is needed - only AC-coupling capacitors (e.g., 220 µF) are required on HP_OUT_L and HP_OUT_R outputs.
What is the function of VREFOUT on AD1887JSTZ-REEL?
VREFOUT (pin 28) provides a regulated 2.25 V ±0.2 V output with 5 mA drive capability, intended to bias electret condenser microphones. As stated in the "ENHANCED FEATURES" list and "ANALOG OUTPUT" specifications (page 3), this eliminates the need for external bias resistors or regulators in microphone input circuits.
Is AD1887JSTZ-REEL RoHS compliant?
Yes, the AD1887JSTZ-REEL is RoHS compliant. The "-REEL" suffix denotes tape-and-reel packaging per JEDEC standards, and Analog Devices confirms RoHS compliance for all AD1887 variants manufactured after 2006. Full compliance documentation (including substance declarations) is available under Analog Devices part number AD1887JSTZ-REEL on their official product page.
AD1887JSTZ-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)
AD1887JSTZ-REEL FAQ
1.How can I place an order for AD1887JSTZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD1887JSTZ-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 AD1887JSTZ-REEL reliable?
The price and inventory of AD1887JSTZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD1887JSTZ-REEL is usually 5 days.
3.What payment methods are accepted for AD1887JSTZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD1887JSTZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD1887JSTZ-REEL?
AD1887JSTZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD1887JSTZ-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 AD1887JSTZ-REEL?
For technical support, including AD1887JSTZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD1887JSTZ-REEL requirements.
6.How does Aetrix verify that AD1887JSTZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD1887JSTZ-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 AD1887JSTZ-REEL meets industry standards.
7.What is the process for return or replacement of AD1887JSTZ-REEL?
All AD1887JSTZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD1887JSTZ-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 AD1887JSTZ-REEL part is unused and in its original packaging.
Return procedure for AD1887JSTZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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