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Analog Devices Inc. AD1848KP
- Part No.:
- AD1848KP
- Manufacturer:
- Analog Devices Inc.
- Category:
- CODECS
- Package:
- 68-LCC (J-Lead)
- Datasheet:
-
AD1848KP.pdf
- Description:
- 16-BIT STEREO CODEC
- Quantity:
- Payment:
- Shipping:
Inventory:11,634
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Product details
Overview
AD1848KP from Analog Devices is a parallel-port 16-bit stereo audio codec IC integrating ∑∆ ADCs and DACs, programmable analog gain/attenuation, on-chip digital interpolation and decimation filters, and byte-wide ISA/EISA bus interface. It operates from single +5 V supplies, supports sample rates from 5.5 kHz to 48 kHz, and delivers >80 dB dynamic range in the 20 Hz–20 kHz audio band - used in PC multimedia sound cards and business audio systems.
For engineers reviewing the AD1848KP datasheet, AD1848KP pinout, AD1848KP application, or AD1848KP equivalent, key selection considerations include its PLCC-68 package, 16-bit linear/µ-law/A-law data format support, dual DMA channel capability, analog input mixing (LINE/MIC/AUX), and integrated anti-imaging/anti-aliasing filtering requiring no external reconstruction components.
Technical Context
The AD1848KP implements fourth-order ∑∆ modulation for both ADC and DAC paths, with 64× oversampling and on-chip digital decimation (ADC) and interpolation (DAC) filters meeting ±0.1 dB passband ripple and >74 dB stopband rejection. Its analog front-end includes independent 0–22.5 dB PGA per channel (1.5 dB steps) and auxiliary input mixers with ±46.5 dB gain/attenuation range.
Digital interface logic supports asynchronous parallel access via CS/WR/RD/ADR0–1, generating DBEN/DBDIR control signals for external 74-series transceivers, and provides dedicated PDRQ/CDAK/CDRQ/PDAK handshake lines for DMA-driven playback and capture at up to 48 kHz with 16-bit twos-complement or companded data formats.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit ADC/DAC with guaranteed no missing codes; enables 96 dB theoretical dynamic range in linear PCM mode. |
| Dynamic Range | 80–87 dB (typ) over 20 Hz–20 kHz; meets CD-quality audio fidelity requirements without external noise-shaping circuitry. |
| Sample Rate Range | 5.5 kHz to 48 kHz; derived from internal dividers of 16.9344 MHz or 24.576 MHz crystals - covers all standard PC audio sampling frequencies. |
| Analog Input Support | Four stereo sources: LINE, MIC (with optional +20 dB preamp), AUX1, AUX2; enables flexible signal routing in mixer-equipped sound cards. |
| Digital Interface | Byte-wide parallel (DATA7:0, ADR1:0, WR, RD, CS); directly connects to ISA/EISA buses without glue logic or address latches. |
| Power Supply | +5 V only (VDD and VCC); 120 mA total operating current - compatible with legacy AT/ATX motherboard power rails. |
| Package | 68-lead PLCC (P-68A); surface-mount compatible with automated PCB assembly and thermal performance suitable for card-edge applications. |
Pinout & Package
AD1848KP is housed in a 68-lead Plastic Leaded Chip Carrier (PLCC) package with 0.050" lead pitch and JEDEC MO-047AC outline. The package supports reflow soldering and provides adequate thermal dissipation (600 mW typical power dissipation) for embedded audio subsystems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DATA7:0 | Bidirectional data bus | Transfers 8-bit control register values or 16-bit audio samples (LSB/MSB across two cycles); requires external latch or transceiver for ISA bus alignment. |
| ADR1:0 | Register address select | Selects among Index Address, Indexed Data, Status, or PIO registers - enables full access to 21 internal registers using only two pins. |
| PDRQ / CDRQ | DMA request outputs | Active-HI signals indicating DAC playback buffer ready or ADC capture buffer full; drive host DMA controller request inputs directly. |
| PDAK / CDAK | DMA acknowledge inputs | Active-LOW handshake confirming WR/RD cycle is a DMA transfer - used to generate DBEN/DBDIR timing for bus drivers. |
| L_LINE / R_LINE | Analog line inputs | Accept 2.6–3.0 Vp-p line-level signals; internally routed to multiplexer and PGA - no external AC coupling required. |
| L_OUT / R_OUT | Analog line outputs | Deliver 1.85–2.1 Vp-p into 10 kΩ load; include on-chip continuous-time low-pass filtering - eliminates need for external RC networks. |
| VREF | Internal 2.25 V reference | Stable buffered voltage for DC-coupled op-amp biasing; must be bypassed externally at VREF_F pin with 1 µF capacitor to GNDA. |
| L_FILT / R_FILT | Analog filter compensation | Require 1.0 µF capacitor to GNDA each; stabilize internal switched-capacitor output filters and ensure phase linearity across audio band. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated ∑∆ ADC/DAC pair | Eliminates need for separate converters and external anti-aliasing/reconstruction filters - reduces BOM count and board area by ≥30%. |
| Software-programmable gain/attenuation | Independent 1.5 dB-step control per channel (0–22.5 dB PGA, –94.5 dB DAC attenuation) enables precise level matching across mixed analog sources. |
| Dual DMA channel support | Enables simultaneous full-duplex audio streaming (playback + capture) without CPU intervention - critical for VoIP and conferencing applications. |
| Analog input mixing (LINE/MIC/AUX) | Allows real-time hardware mixing of microphone, line, and auxiliary inputs prior to ADC conversion - offloads DSP processing from host CPU. |
| Multiple data format support | Hardware-accelerated conversion between 16-bit linear PCM, 8-bit µ-law, and 8-bit A-law - ensures compatibility with Windows Sound System and legacy telephony codecs. |
| Zero-crossing volume control | Prevents audible "zipper noise" during attenuation changes by synchronizing updates to signal zero crossings - improves perceived audio quality during real-time level adjustment. |
Applications
| PC Multimedia Sound Cards | Business Desktop Audio Systems |
|---|---|
Use Scenario: Integrated audio solution for ISA/EISA-based add-in sound cards targeting Windows-compatible multimedia PCs. IC Role / Device Role / Timing Role: Primary stereo audio codec handling analog-to-digital and digital-to-analog conversion, sample rate generation, and bus interface timing. Use Value: Reduces design complexity by consolidating ADC, DAC, filters, and parallel interface into one IC - cuts component count vs. discrete solutions by >50%. |
Use Scenario: Embedded audio subsystem in office desktop PCs requiring line-in, mic-in, and stereo line-out with Windows Sound System compliance. IC Role / Device Role / Timing Role: Central audio data path controller managing input multiplexing, gain staging, digital mixing, and synchronized playback/capture DMA transfers. Use Value: Delivers >80 dB SNR and 48 kHz sample rate support while maintaining compatibility with legacy BIOS and DOS audio drivers. |
| Industrial Voice Recording Terminals | Legacy Telephony Interface Adapters |
Use Scenario: Compact voice logging device capturing analog microphone input and storing digitized audio on flash memory via microcontroller interface. IC Role / Device Role / Timing Role: High-fidelity analog front-end and digital audio interface providing programmable mic gain, anti-aliasing filtering, and 8-bit µ-law compression. Use Value: Enables direct µ-law encoding at hardware level - reduces host MCU processing load and memory footprint for long-duration recordings. |
Use Scenario: PC-based telephony adapter connecting analog telephone lines to host system for call recording, IVR, or fax modem functions. IC Role / Device Role / Timing Role: Audio bridge converting between analog PSTN signals and digital PCM/µ-law streams compliant with T.30/T.38 standards. Use Value: On-chip A-law/µ-law support and 44.1/8 kHz sampling ensures interoperability with global telephony infrastructure without software transcoding. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar stereo audio codec applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CS4231-KQZ | PCI-bus interface (not ISA), higher integration (on-chip clock generator), 90 dB dynamic range, supports 96 kHz max sample rate. | Targeted at PCI-based sound cards and newer industrial controllers; lacks native ISA timing and PLCC packaging. | Choose for PCI platforms requiring extended dynamic range and higher sample rates; not drop-in replaceable due to bus architecture and pinout differences. |
| WM8775SEDS | Stereo ADC-only (no DAC), I²S/PCM serial interface, 24-bit resolution, 100 dB dynamic range, 3.3 V operation. | Designed for modern embedded audio where DAC is handled separately (e.g., FPGA or DSP); no parallel bus or microphone preamp support. | Use when high-resolution capture is prioritized over playback and system uses serial audio interfaces; requires redesign of data path and power supply. |
Compared with CS4231-KQZ and WM8775SEDS, the AD1848KP uniquely combines ISA-compatible parallel interface, integrated stereo DAC+ADC, microphone preamplification, and PLCC packaging - making it the only viable option for legacy PC sound card refurbishment and industrial systems constrained to 5 V/ISA architecture.
Availability
AD1848KP is available at Aetrix Electronics and suitable for PC sound card manufacturing, industrial voice recording terminals, legacy telephony interface adapters, and business desktop audio systems requiring stable component supply and long-term obsolescence management.
Supply support for AD1848KP 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies since 1965.
The AD1848KP belongs to Analog Devices' SoundPort® family of audio codecs, designed specifically to deliver integrated, ISA-compatible audio solutions for cost-sensitive PC multimedia and business audio applications in the mid-1990s.
FAQ
What is the primary function of the AD1848KP in a PC sound card design?
The AD1848KP serves as the core stereo audio codec in ISA-based sound cards, performing simultaneous analog-to-digital conversion (for microphone/line input) and digital-to-analog conversion (for speaker/headphone output), while providing hardware-level mixing, gain control, and direct parallel interface to the host bus - eliminating need for external converters or glue logic in AD1848KP-based designs.
Does the AD1848KP support both µ-law and A-law companding, and how is format selection implemented?
Yes, the AD1848KP supports both 8-bit µ-law and A-law companded data formats alongside 16-bit linear PCM and 8-bit linear PCM. Format selection is controlled via bits CFS2–CFS0 and CSS in Clock and Data Format register (Index 8); the codec performs real-time hardware expansion/compression, ensuring full compatibility with Windows Sound System and telephony standards without host CPU involvement in AD1848KP operation.
What are the key timing requirements for interfacing the AD1848KP with an ISA bus?
The AD1848KP requires WR/RD strobe widths ≥110 ns, setup times ≥10 ns for CS/ADR, and data hold times ≥15 ns after WR rising edge. Its DBEN/DBDIR outputs are synchronized to WR/RD edges to drive external 74LVC245 transceivers, and PDRQ/CDAK handshaking ensures reliable DMA transfers - all timing parameters are fully compatible with standard ISA bus cycles as defined in AD1848KP datasheet Rev. 0.
How does the AD1848KP handle microphone input sensitivity, and what gain options are available?
The AD1848KP provides dual-stage microphone input conditioning: first, optional +20 dB fixed-gain preamplification (MGE bit), followed by programmable 0–22.5 dB PGA in 1.5 dB steps per channel (LIG3–LIG0/RIG3–RIG0). This allows direct connection of low-output condenser mics while maintaining headroom for line-level signals - a capability confirmed in AD1848KP's analog input specifications and functional description.
Is the AD1848KP still manufacturable, and what is its current status with Analog Devices?
The AD1848KP is marked as OBSOLETE in Analog Devices' official documentation (Rev. 0 datasheet, page 6), with last-time-buy availability discontinued. However, Aetrix Electronics maintains verified legacy inventory with full traceability, supporting repair, refurbishment, and long-life production programs where AD1848KP remains the only functionally and mechanically compatible replacement for original equipment.
AD1848KP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 68-LCC (J-Lead)
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Stereo Audio
- Data Interface:
- Parallel
- 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:
- 86 / 87
- Voltage - Supply, Analog:
- 4.75V ~ 5.25V
- Voltage - Supply, Digital:
- 4.75V ~ 5.25V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 68-PLCC (24.23x24.23)
AD1848KP FAQ
1.How can I place an order for AD1848KP through Aetrix?
Please submit a Request for Quotation (RFQ) for AD1848KP 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 AD1848KP reliable?
The price and inventory of AD1848KP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD1848KP is usually 5 days.
3.What payment methods are accepted for AD1848KP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD1848KP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD1848KP?
AD1848KP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD1848KP 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 AD1848KP?
For technical support, including AD1848KP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD1848KP requirements.
6.How does Aetrix verify that AD1848KP is sourced from the original manufacturer or authorized distributors?
All AD1848KP 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 AD1848KP meets industry standards.
7.What is the process for return or replacement of AD1848KP?
All AD1848KP units undergo pre-shipment inspection (PSI). If there is an issue with AD1848KP, 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 AD1848KP part is unused and in its original packaging.
Return procedure for AD1848KP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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