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Analog Devices Inc. AD1838AASZ-REEL
- Part No.:
- AD1838AASZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- CODECS
- Package:
- 52-QFP
- Datasheet:
-
AD1838AASZ-REEL.pdf
- Description:
- IC CODEC 2ADC/6DAC 24 BIT 52MQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,374
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Product details
Overview
AD1838AASZ-REEL from Analog Devices is a high-performance 24-bit stereo audio codec integrating three independent stereo DACs (6 channels) and one stereo ADC (2 channels), supporting up to 96 kHz sample rates (192 kHz on DAC1 only), with differential analog I/O, on-chip 2.25 V reference, and SPI-compatible control interface. It delivers 105 dB ADC SNR and 108 dB DAC SNR with –95 dB THD+N, targeting multichannel audio systems requiring low noise, precise volume control, and flexible digital interfacing.
For engineers reviewing the AD1838AASZ-REEL datasheet, AD1838AASZ-REEL pinout, AD1838AASZ-REEL application, or AD1838AASZ-REEL equivalent, key selection considerations include its triple-DAC architecture for multi-zone audio, TDM256/512 support for 8-in/8-out expansion via SHARC SPORT, 3.3 V–tolerant ODVDD digital I/O, and industrial-grade –40°C to +85°C operation in MQFP-52.
Technical Context
The AD1838AASZ-REEL implements sigma-delta modulation with multibit ΔΣ converters: dual 24-bit ADCs use decimation filters (120 dB stop-band attenuation, 460–910 µs group delay), while six DAC channels employ interpolation filters (55–80 dB stop-band attenuation, 110–340 µs group delay) and data-directed scrambling for jitter immunity. Its clocking supports MCLK ×1/×2/×2/3 scaling to accommodate 48/96/192 kHz operation with IMCLK ≤24.576 MHz.
Serial interfaces are fully configurable: ADC and DAC ports support I²S, left/right-justified, DSP, and packed TDM modes; the auxiliary interface enables glueless connection to external stereo ADCs/DACs; and the SPI control port (16-bit words, ≤12.5 MHz CCLK) manages per-channel 1024-step volume, clickless mute, de-emphasis, and peak detection registers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| DAC Channels | 6 (3 stereo pairs), enabling simultaneous multi-zone or multi-speaker output without external multiplexing |
| ADC Resolution | 24-bit, delivering 105 dB dynamic range (A-weighted) for high-fidelity recording and feedback sensing |
| DAC SNR / THD+N | 108 dB SNR and –95 dB THD+N at 48/96 kHz, ensuring ultra-low noise floor in premium playback paths |
| Sample Rates | ADC: 48/96 kHz; DAC: 48/96/192 kHz (DAC1 only), allowing legacy compatibility and high-res audio rendering |
| Volume Control | 1024 linear steps (0.098% step size, 60 dB range) per DAC channel, enabling precise gain matching across zones |
| Digital Interface | 3.3 V–tolerant ODVDD supply and SPI/I²S/TDM256/TDM512 modes, simplifying integration with modern 3.3 V DSPs and FPGAs |
| Package | 52-lead MQFP (S-52-1), industrial –40°C to +85°C rating, suitable for automotive and home theater PCB layouts |
Pinout & Package
AD1838AASZ-REEL is housed in a 52-lead MQFP (S-52-1) package with exposed thermal pad (not electrically connected). Pin functions are validated per Analog Devices AD1838A Rev. A datasheet Figure 7 and Pin Function Descriptions table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 39 DVDD | Digital power supply input | 5 V supply for digital core and I/O buffers; requires local 100 nF + 22 µF bypassing |
| 2 CLATCH | SPI control latch input | Strobes 16-bit CIN data into internal shift register on rising edge; timing-critical for register writes |
| 4 PD/RST | Power-down/reset input | Active-low signal that resets all registers, powers down analog sections, and initiates 20-LRCLK initialization sequence |
| 6–9, 12–15, 26–28 OUTLNx/OUTLPx/OUTRNx/OUTRPx | Differential DAC analog outputs | Six fully differential voltage outputs (±1.4 V swing at 0 dBFS), each referenced to 2.25 V common-mode for optimal PSRR |
| 20–23 ADCLN/ADCLP/ADCRN/ADCRP | Differential ADC analog inputs | High-impedance (4 kΩ), low-capacitance (15 pF) inputs accepting ±2.828 V differential range with 2.25 V common-mode |
| 37 DLRCLK / 38 DBCLK | DAC serial interface clocks | Frame (LRCLK) and bit (BCLK) clocks-configurable as master or slave; support 64/256 fS BCLK ratios |
| 45 ABCLK / 46 ALRCLK | ADC serial interface clocks | Frame and bit clocks for ADC data output; M/S pin selects master (generates clocks) or slave (accepts clocks) mode |
| 47 MCLK | Master clock input | Accepts 12.288 MHz (256 fS @ 48 kHz) or 24.576 MHz (256 fS @ 96 kHz); internal scaler adjusts IMCLK to ≤24.576 MHz |
Key Features
| Feature | Design Value |
|---|---|
| Triple stereo DAC architecture | Enables independent volume control, mute, and signal routing for three distinct audio zones (e.g., front/rear/subwoofer) without external DACs |
| Data-directed scrambling DACs | Reduces sensitivity to master clock jitter, maintaining –95 dB THD+N even with ≤300 ps rms jitter-critical for crystal-less or FPGA-derived clocks |
| On-chip 2.25 V reference with FILTR pin | Provides stable bias for differential I/O stages and can drive external op-amps; requires 10 µF/100 nF local bypass for <10 µV noise |
| TDM256/TDM512 interface mode | Supports 8-in/8-out audio using single SHARC SPORT with no glue logic-enables full-duplex multichannel processing in compact designs |
| Clickless software mute & volume ramping | Eliminates pop/click artifacts during real-time gain changes or muting, essential for user-interactive audio systems |
| Digital de-emphasis processing | Applies standardized 50/15 µs de-emphasis to compensate for pre-emphasized CD sources, with ±0.1 dB gain accuracy |
Applications
| DVD/Blu-ray Audio Playback | Automotive Infotainment Head Unit |
|---|---|
Use Scenario: Decoding multichannel PCM and Dolby Digital bitstreams for discrete 5.1/7.1 speaker output in consumer disc players. IC Role / Device Role / Timing Role: Primary audio codec handling DAC conversion, sample rate conversion, and digital de-emphasis before analog amplification. Use Value: Triple-DAC architecture eliminates need for multiple codecs; 108 dB DAC SNR preserves dynamic range of high-resolution audio tracks. |
Use Scenario: Central audio hub in vehicle head units managing navigation voice prompts, Bluetooth streaming, and rear-seat entertainment simultaneously. IC Role / Device Role / Timing Role: Multifunction audio processor providing ADC input for microphone arrays and six DAC outputs for zone-specific amplifiers. Use Value: TDM512 mode enables 8-channel I/O over single SHARC SPORT; industrial temperature rating ensures reliability under dashboard thermal stress. |
| Home Theater AV Receiver | Digital Audio Effects Processor |
Use Scenario: High-end receiver performing real-time bass management, room correction, and upmixing for immersive surround sound. IC Role / Device Role / Timing Role: Precision ADC captures analog source signals; DACs feed discrete amplifier channels with matched gain and phase. Use Value: 0.025 dB interchannel gain mismatch and ±0.1° phase deviation ensure accurate spatial imaging and LFE channel integrity. |
Use Scenario: Rack-mountable effects unit applying reverb, delay, and pitch shifting to live instrument inputs before analog output. IC Role / Device Role / Timing Role: Low-latency audio interface converting processed digital audio to analog with minimal added noise or distortion. Use Value: Differential outputs reduce EMI in dense rack environments; 192 kHz DAC1 capability supports ultrahigh-fidelity effect rendering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel audio codec applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AK4355VN | Single stereo DAC (2 channels), no integrated ADC, 105 dB SNR, supports 192 kHz, uses 3-wire serial interface | Lacks ADC and multi-DAC capability; suited for playback-only systems with external ADC | Select when only high-fidelity DAC performance is required and ADC functionality is handled externally |
| CS4382-KQZ | Octal DAC (8 channels), no ADC, 114 dB SNR, 24-bit, supports 192 kHz, uses I²S/TDM interface | Higher channel count and SNR but no ADC or SPI control; requires external microcontroller for register configuration | Choose for pure multichannel playback systems prioritizing SNR and channel density over integrated control and ADC |
Compared with AK4355VN and CS4382-KQZ, AD1838AASZ-REEL uniquely combines triple stereo DACs, stereo ADC, SPI configurability, and TDM expansion in one industrial-grade MQFP package-making it optimal for space-constrained, self-contained multichannel audio systems requiring both capture and playback.
Availability
AD1838AASZ-REEL is available at Aetrix Electronics and suitable for DVD/Blu-ray players, automotive infotainment head units, and home theater AV receivers requiring stable component supply, long-lifecycle support, and Pb-free compliance.
Supply support for AD1838AASZ-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, headquartered in Norwood, MA, with decades of expertise in precision data conversion and audio technology.
The AD1838A product line was designed specifically for professional and consumer multichannel audio systems demanding simultaneous high-fidelity analog-to-digital and digital-to-analog conversion with flexible digital interfacing and robust industrial operation.
FAQ
What is the maximum sample rate supported by the ADC in AD1838AASZ-REEL?
The ADC in AD1838AASZ-REEL supports a maximum sample rate of 96 kHz, achieved by configuring the decimator to operate at IMCLK/256 (e.g., with a 24.576 MHz internal master clock). At 48 kHz, it uses IMCLK/512. The ADC does not support 192 kHz sampling-only DAC1 among the six DAC channels does.
Does AD1838AASZ-REEL include an integrated voltage reference, and how is it used?
Yes, AD1838AASZ-REEL includes an on-chip 2.25 V reference brought out on the FILTR pin. It serves as the common-mode voltage for all differential analog inputs and outputs and can bias external op-amps. A parallel 10 µF/100 nF capacitor must be placed directly at the FILTR pin to maintain low-noise performance.
Can AD1838AASZ-REEL operate with a 3.3 V digital interface while using 5 V analog supplies?
Yes, AD1838AASZ-REEL supports mixed-supply operation: AVDD and DVDD are 5 V for analog and core digital logic, while ODVDD (pin 48) accepts 3.0 V to DVDD (i.e., 3.3 V), enabling direct interfacing with 3.3 V DSPs, FPGAs, or microcontrollers without level shifters.
How many independent volume controls does AD1838AASZ-REEL provide, and what is their resolution?
AD1838AASZ-REEL provides six independent volume controls-one per DAC channel-with 1024 linear steps (0.098% step size) across a 60 dB attenuation range. Each control is software-configurable via SPI and supports clickless mute transitions to prevent audible artifacts.
What packaging and environmental specifications apply to AD1838AASZ-REEL?
AD1838AASZ-REEL is supplied in a 52-lead MQFP package (S-52-1) with Pb-free finish (indicated by "Z" suffix) and is specified for the industrial temperature range of –40°C to +85°C. Absolute maximum ratings include 6 V on AVDD/DVDD/ODVDD and ±0.3 V between AGND and DGND.
AD1838AASZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 52-QFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Stereo Audio
- Data Interface:
- Serial
- Resolution (Bits):
- 24 b
- Number of ADCs / DACs:
- 2 / 6
- Sigma Delta:
- Yes
- S/N Ratio, ADCs / DACs (db) Typ:
- 105 / 108
- Dynamic Range, ADCs / DACs (db) Typ:
- 105 / 108
- Voltage - Supply, Analog:
- 4.5V ~ 5.5V
- Voltage - Supply, Digital:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 52-MQFP (10x10)
AD1838AASZ-REEL FAQ
1.How can I place an order for AD1838AASZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD1838AASZ-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 AD1838AASZ-REEL reliable?
The price and inventory of AD1838AASZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD1838AASZ-REEL is usually 5 days.
3.What payment methods are accepted for AD1838AASZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD1838AASZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD1838AASZ-REEL?
AD1838AASZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD1838AASZ-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 AD1838AASZ-REEL?
For technical support, including AD1838AASZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD1838AASZ-REEL requirements.
6.How does Aetrix verify that AD1838AASZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD1838AASZ-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 AD1838AASZ-REEL meets industry standards.
7.What is the process for return or replacement of AD1838AASZ-REEL?
All AD1838AASZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD1838AASZ-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 AD1838AASZ-REEL part is unused and in its original packaging.
Return procedure for AD1838AASZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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