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Analog Devices Inc. AD1847JP
- Part No.:
- AD1847JP
- Manufacturer:
- Analog Devices Inc.
- Category:
- CODECS
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
AD1847JP.pdf
- Description:
- 16-BIT SOUNDCOMM CODEC
- Quantity:
- Payment:
- Shipping:
Inventory:121,828
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Product details
Overview
AD1847JP from Analog Devices is a single-chip 16-bit stereo audio codec integrating ∑∆ ADCs and DACs, programmable analog/digital gain/attenuation, on-chip interpolation/decimation filters, and a serial TDM interface compatible with ADSP-21xx DSPs. It operates from a single +5 V supply, supports sample rates from 5.5 kHz to 48 kHz, and delivers 70 dB ADC and 76 dB DAC dynamic range for PC multimedia, business audio, and game sound applications.
For engineers reviewing the AD1847JP datasheet, AD1847JP pinout, AD1847JP application, or AD1847JP equivalent, key selection considerations include its 44-lead PLCC package, dual-crystal clock support (16.9344 MHz / 24.576 MHz), 16-bit linear/µ-law/A-law data format handling, analog input multiplexing across four stereo sources, and digital/analog mixing capability - all critical for legacy PC audio subsystem design and embedded voice I/O integration.
Technical Context
The AD1847JP implements fourth-order ∑∆ modulation in both ADC and DAC paths, with 64× oversampling enabling minimal external anti-aliasing/anti-imaging filtering. Its digital decimation filter provides 0.4×FS passband, 74 dB stopband rejection, and <1 µs group delay variation, while the interpolation filter ensures clean DAC output reconstruction up to 20 kHz.
It uses a Time Division Multiplex (TDM) serial interface with configurable 32-slot framing, supporting both 1-wire (TSSEL=0) and 2-wire (TSSEL=1) modes. Control and data are separated via dedicated time slots, and register access occurs through indirect addressing using 16-bit control/status words and indexed 8-bit registers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit ADC/DAC - enables 96 dB theoretical dynamic range in linear PCM mode |
| Dynamic Range (A-weighted) | 70 dB (ADC), 76 dB (DAC) - meets Windows Sound System requirements for consumer audio fidelity |
| Sample Rate Range | 5.5 kHz to 48 kHz - covers telephony (8 kHz), CD (44.1 kHz), and professional audio (48 kHz) standards |
| Analog Input Channels | Four stereo pairs (LINE1/LINE2/AUX1/AUX2) - allows flexible source selection without external mux |
| Digital Interface | TDM serial with 32×16-bit slots - directly interfaces with ADSP-21xx SPORT0 in multi-channel mode |
| Power Supply | +5 V only (VDD/VCC) - simplifies power design vs. dual-supply codecs; 140 mA total operating current |
| Package | 44-Lead PLCC (P-44A) - surface-mount compatible with legacy PC motherboard layouts |
Pinout & Package
AD1847JP is housed in a 44-lead Plastic Leaded Chip Carrier (PLCC) package with J-lead geometry, designed for socketed or reflow-soldered mounting on PC motherboards and add-in cards. Pin 1 is marked by a corner notch; leads are numbered counterclockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCLK (Pin 1) | Serial Clock I/O | Bidirectional clock signal; outputs 12.288 MHz (XTAL1) or 11.2896 MHz (XTAL2) when BM=HI; required for synchronous TDM frame timing |
| SDFS (Pin 6) | Frame Sync I/O | Generates or accepts frame sync at ½ or full sample rate; defines 32-slot TDM boundaries for multi-codec daisy-chaining |
| SDI (Pin 4) | Serial Data Input | Accepts 16-bit control words and playback data (MSB-first); used for register writes and DAC input streaming |
| SDO (Pin 5) | Serial Data Output | Three-state output delivering status/index readback and ADC capture data; shares bus in 1-wire configurations |
| L_LINE1 (Pin 23) | Analog Input | Left channel of primary line-level input pair; ac-coupled, 10 kΩ input impedance, 2.8 Vp-p full-scale |
| R_OUT (Pin 28) | Analog Output | Right channel line-level output; 0.707 Vrms, 600 Ω impedance, mute settles near 2.25 V reference |
| VREF (Pin 16) | Voltage Reference | 2.25 V buffered reference for external dc-coupling circuitry; must be bypassed at VREFI (Pin 15) with 1 µF capacitor |
| XTAL1I (Pin 40) | Clock Input | 24.576 MHz crystal input; selected by default at power-up; enables 8/16/32/48 kHz sample rates |
Key Features
| Feature | Design Value |
|---|---|
| On-chip analog anti-imaging filters | Eliminates need for external RC/LC networks at DAC outputs - reduces BOM cost and board area |
| Independent 1.5 dB-step analog attenuation | –94.5 dB DAC channel volume control with zero-crossing switching - prevents audible "zipper" noise during level changes |
| Dual-crystal clock architecture | Supports 14 discrete sample rates (5.5–48 kHz) from 16.9344 MHz and 24.576 MHz crystals - avoids external PLL complexity |
| Four digital data formats | Hardware-supported 16-bit linear PCM, 8-bit µ-law, 8-bit A-law, and 8-bit unsigned linear - enables direct compatibility with PSTN, VoIP, and legacy PC audio APIs |
| Integrated analog/digital mixing | Simultaneous analog mixing of AUX inputs with DAC output, plus digital mixing of ADC output into DAC input - enables monitor-without-playback and echo cancellation paths |
Applications
| PC Multimedia Audio Subsystem | Legacy Game Console Sound Engine |
|---|---|
Use Scenario: Integrated audio I/O on ISA/EISA or early PCI-based PC motherboards requiring Windows Sound System compliance. IC Role / Device Role / Timing Role: Primary stereo codec handling simultaneous analog input capture and digital playback via DSP-controlled TDM interface. Use Value: Single-chip solution eliminates discrete ADC/DAC/filter/mux ICs, reducing layout complexity and meeting Microsoft's 70+ dB SNR requirement. | Use Scenario: Real-time audio processing in 1990s-era home game consoles with limited PCB space and fixed +5 V rail. IC Role / Device Role / Timing Role: Audio data converter interfacing with custom ASIC or Z80-family CPU via serial port; supports µ-law for compressed voice samples. Use Value: On-chip interpolation/decimation filters and programmable gain enable high-fidelity sampled sound with no external passive components. |
| Business Desktop Voice Recording | Industrial Voice Prompt System |
Use Scenario: USB-adjacent or parallel-port-connected voice recording hardware for call centers and dictation systems. IC Role / Device Role / Timing Role: Stereo ADC front-end capturing line/mic inputs with software-selectable gain, feeding digitized audio to host controller. Use Value: Four analog input pairs (LINE1/LINE2/AUX1/AUX2) allow simultaneous monitoring of multiple audio sources without external switching. | Use Scenario: Embedded voice prompt playback in kiosks, medical devices, or factory HMIs where reliability and low component count are critical. IC Role / Device Role / Timing Role: DAC-only playback engine decoding pre-stored A-law compressed prompts stored in flash memory. Use Value: Hardware A-law decompression and 76 dB DAC dynamic range ensure intelligible, low-noise speech output without DSP overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar stereo audio codec applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD1845JP | 16-bit stereo codec with identical pinout and register map but lacks AUX2 inputs and has reduced digital mixing flexibility | Targeted at cost-sensitive PC audio where four analog inputs are unnecessary | Select AD1845JP only if AUX2 channel and extended digital mix control are not required |
| CS4231-KQ | 16-bit stereo codec with ISA bus interface (not serial TDM); requires external FIFO and control logic; higher power consumption (180 mA) | Designed for direct ISA slot integration without DSP coupling | Choose CS4231-KQ when interfacing with x86 CPU via ISA rather than ADSP-21xx DSP via serial port |
Compared with AD1847JP, AD1845JP offers pin-compatible simplification at the expense of input flexibility, while CS4231-KQ trades serial TDM efficiency for ISA-native control - making AD1847JP uniquely suited for DSP-centric, space-constrained embedded audio designs.
Availability
AD1847JP is available at Aetrix Electronics and suitable for PC motherboard design, legacy game console repair, industrial voice prompt systems, and embedded audio subsystems requiring stable component supply and long-term obsolescence management.
Supply support for AD1847JP 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies since 1965.
The AD1847JP belongs to Analog Devices' SoundPort® family of audio codecs, engineered specifically for cost-effective, single-supply PC multimedia and embedded voice applications requiring integrated analog front-end and serial digital interface functionality.
FAQ
What is the primary function of the AD1847JP in an audio system?
The AD1847JP serves as a complete stereo audio codec, performing simultaneous analog-to-digital conversion (ADC) of up to four stereo input sources and digital-to-analog conversion (DAC) of stereo playback data. It integrates programmable gain amplifiers, analog/digital mixers, interpolation/decimation filters, and a TDM serial interface - enabling compact, low-cost audio I/O in PC and embedded systems without external support ICs.
Does the AD1847JP support both µ-law and A-law companding formats?
Yes, the AD1847JP natively supports both 8-bit µ-law and A-law companded data formats in addition to 16-bit linear PCM and 8-bit unsigned linear PCM. Format selection is controlled via register bits, and internal expansion/compression is performed automatically - allowing the AD1847JP to interface directly with PSTN gateways, VoIP endpoints, and legacy telephony software stacks without host CPU intervention.
What are the clocking options for the AD1847JP, and how do they affect sample rate selection?
The AD1847JP accepts two external crystal frequencies: 24.576 MHz (XTAL1) and 16.9344 MHz (XTAL2). These crystals generate 14 discrete sample rates from 5.5125 kHz to 48 kHz via on-chip dividers and PLL-free synthesis. XTAL1 is selected by default at power-up; XTAL2 must be explicitly enabled via control register. No external clock generator is needed - simplifying timing design for AD1847JP-based systems.
How does the AD1847JP handle analog input multiplexing and gain control?
The AD1847JP features an analog input multiplexer selecting among LINE1, LINE2, AUX1, and post-mixed DAC output, feeding into a programmable gain amplifier (PGA) with independent left/right channel control. PGA gain ranges from 0 dB to +22.5 dB in 1.5 dB steps, and is configured via index registers. This allows precise signal conditioning before ADC conversion - critical for matching varying source levels in multi-input audio systems using the AD1847JP.
Is the AD1847JP still in active production, and what supply-chain support is available?
The AD1847JP is marked obsolete by Analog Devices, but Aetrix Electronics maintains verified legacy inventory with full traceability and extended lifecycle support. We provide documented lot history, burn-in test reports, and BOM continuity planning for AD1847JP - ensuring reliable supply for maintenance, repair, and legacy product manufacturing programs dependent on this specific part.
AD1847JP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- AD1847
- Package/Case:
- 44-LCC (J-Lead)
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Stereo Audio
- Data Interface:
- Parallel, 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:
- 70 / 76
- Voltage - Supply, Analog:
- 4.75V ~ 5.25V
- Voltage - Supply, Digital:
- 4.75V ~ 5.25V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 44-PLCC (16.59x16.59)
AD1847JP FAQ
1.How can I place an order for AD1847JP through Aetrix?
Please submit a Request for Quotation (RFQ) for AD1847JP 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 AD1847JP reliable?
The price and inventory of AD1847JP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD1847JP is usually 5 days.
3.What payment methods are accepted for AD1847JP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD1847JP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD1847JP?
AD1847JP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD1847JP 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 AD1847JP?
For technical support, including AD1847JP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD1847JP requirements.
6.How does Aetrix verify that AD1847JP is sourced from the original manufacturer or authorized distributors?
All AD1847JP 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 AD1847JP meets industry standards.
7.What is the process for return or replacement of AD1847JP?
All AD1847JP units undergo pre-shipment inspection (PSI). If there is an issue with AD1847JP, 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 AD1847JP part is unused and in its original packaging.
Return procedure for AD1847JP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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