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Analog Devices Inc. AD1838AAS
- Part No.:
- AD1838AAS
- Manufacturer:
- Analog Devices Inc.
- Category:
- CODECS
- Package:
- 52-QFP
- Datasheet:
-
AD1838AAS.pdf
- Description:
- IC CODEC 2ADC/6DAC 24BIT 52-MQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,510
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Product details
Overview
AD1838AAS from Analog Devices is a 24-bit, 96 kHz stereo audio codec with three independent stereo DACs (6 channels) and one stereo ADC (2 channels), integrated on a single IC. It delivers –95 dB THD+N, 105 dB ADC SNR, 108 dB DAC SNR, differential analog I/O, and on-chip 2.25 V reference - used in DVD players, home theater receivers, and automotive audio systems requiring high-fidelity multichannel conversion.
For engineers reviewing the AD1838AAS datasheet, AD1838AAS pinout, AD1838AAS application, or AD1838AAS equivalent, key selection criteria include its 52-lead MQFP package, 3.3 V–tolerant digital interface (ODVDD), TDM256/512 support for 8-in/8-out operation, and software-controllable clickless mute per channel.
Technical Context
The AD1838AAS implements multibit ΔΣ modulation in both ADC and DAC paths, with patented differential linearity restoration to suppress idle tones. Its ADC uses 128× oversampling at 48 kHz (64× at 96 kHz), while DAC interpolation supports 48/96/192 kHz rates via programmable filter taps and clock scaler control.
Digital interface flexibility includes I²S, left/right-justified, DSP, and packed TDM modes - with independent master/slave configuration for ADC and DAC ports, plus auxiliary TDM mode enabling glueless connection to SHARC® SPORT for 8-channel I/O expansion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ADC Resolution | 24-bit - enables >144 dB theoretical dynamic range before noise shaping |
| DAC Dynamic Range (A-weighted) | 108 dB at 48/96 kHz - meets high-end consumer audio SNR requirements |
| THD + N (ADC/DAC) | –95 dB - ensures low distortion across full audio band (20 Hz–20 kHz) |
| Sample Rates Supported | 48 kHz, 96 kHz (ADC); 48/96/192 kHz (DAC1 only) - supports CD, DVD-Audio, and studio-grade playback |
| Volume Control | 1024-step linear scale (0.098% step, 60 dB range) - enables precise channel balancing without external attenuators |
| Digital Interface Supply | ODVDD = 3.0 V to DVDD - allows direct interfacing with 3.3 V DSPs/FPGAs without level shifters |
| Package | 52-lead MQFP (S-52-1) - industrial temperature range (–40°C to +85°C), surface-mount compatible |
Pinout & Package
AD1838AAS is housed in a 52-lead MQFP (S-52-1) package with exposed thermal pad (not electrically connected). Pin 1 is located at top-left corner; pins numbered counterclockwise. AGND/DGND separation and dedicated AVDD/DVDD/ODVDD supplies enforce analog-digital domain isolation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUTLP1 / OUTLN1 | DAC1 Left Channel Differential Output | Provides balanced ±1.4 V output swing referenced to 2.25 V common-mode; requires external third-order LPF |
| ADCLP / ADCLN | ADC Left Channel Differential Input | Accepts ±2.828 V differential full-scale input; 4 kΩ input impedance, 15 pF capacitance |
| MCLK | Master Clock Input | Accepts 12.288 MHz (256× fS) or 24.576 MHz (512× fS); internal scaler supports ×1, ×2, or ×2/3 |
| DLRCLK / DBCLK | DAC Frame & Bit Clock | Configurable as input or output; supports I²S, LJ/RJ, DSP, and packed TDM serial formats |
| CIN / CCLK / CLATCH / COUT | SPI-Compatible Control Port | 16-bit command interface (CIN data, CCLK clock, CLATCH latch, COUT readback); up to 12.5 MHz |
| FILTD / FILTR | Filter Capacitor Connections | FILTD: reduces DAC bias noise (10 µF/100 nF recommended); FILTR: stabilizes 2.25 V internal reference |
Key Features
| Feature | Design Value |
|---|---|
| Data-directed scrambling DACs | Minimizes jitter sensitivity - critical when using low-cost crystal oscillators or shared clock trees |
| Independent per-channel volume control | 1024 linear steps enable precise gain matching across 6 DAC outputs without external DACs | Clickless mute with software control | Eliminates pop/click artifacts during power transitions or channel muting in real-time audio systems |
| TDM256/512 interface mode | Enables 8-in/8-out audio routing over single data lines - reduces PCB trace count vs. discrete serial ports |
| On-chip 2.25 V voltage reference | Stable reference for external op-amp biasing and ADC/DAC common-mode setting; <50 µA load limit |
Applications
| DVD Audio Playback System | Home Theater A/V Receiver |
|---|---|
Use Scenario: Decoding multi-channel PCM and Dolby Digital bitstreams into analog 5.1/7.1 speaker outputs. IC Role / Device Role / Timing Role: Primary multichannel DAC subsystem - converts digital audio streams to six differential analog outputs (3 stereo pairs) with independent volume control. Use Value: Enables simultaneous playback of front, center, surround, and subwoofer channels with <0.025 dB interchannel gain mismatch and –100 dB mute attenuation. | Use Scenario: Aggregating HDMI/SPDIF inputs, applying DSP-based room correction, and driving multiple amplifier stages. IC Role / Device Role / Timing Role: High-SNR ADC front-end and DAC output stage - digitizes analog aux inputs and renders processed audio to preamp circuits. Use Value: Delivers 105 dB ADC SNR and 108 dB DAC SNR, supporting wide-dynamic-range audio processing without quantization floor limitations. |
| Automotive Infotainment Head Unit | Digital Audio Effects Processor |
Use Scenario: Real-time mixing of navigation voice prompts, Bluetooth phone audio, and media playback with adaptive loudness compensation. IC Role / Device Role / Timing Role: Low-jitter, 3.3 V–compatible audio interface - bridges 3.3 V SoC audio engine to analog amplifier chain via differential outputs. Use Value: ODVDD pin allows direct connection to 3.3 V domain; differential outputs reject EMI in noisy vehicle environments. | Use Scenario: Inserting reverb, delay, and pitch-shifting effects into live microphone or instrument signals before recording or monitoring. IC Role / Device Role / Timing Role: Low-latency, high-fidelity conversion node - ADC captures signal, DSP applies effect, DAC renders result with minimal group delay variation. Use Value: ADC group delay = 460 µs (96 kHz), DAC group delay = 160 µs (96 kHz), enabling sub-millisecond round-trip latency for real-time monitoring. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar audio codec applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AK4384VN | 24-bit/192 kHz stereo DAC only (no ADC); 64-QFN; no TDM mode | Lacks integrated ADC and multichannel TDM support - requires separate ADC for bidirectional audio | Select when only high-performance DAC functionality is needed and system already includes ADC |
| CS4272-CQZ | 24-bit/192 kHz stereo codec; 48-TQFP; SPI/I²S only (no TDM256/512) | Supports fewer serial formats and lacks SHARC SPORT compatibility - limits 8-channel expansion capability | Select when compact footprint and basic I²S interface suffice, and 8-in/8-out is not required |
Compared with AK4384VN and CS4272-CQZ, the AD1838AAS uniquely integrates three stereo DACs + one stereo ADC in a single 52-MQFP package with TDM256/512 and SHARC SPORT compatibility - making it optimal for space-constrained, multichannel embedded audio systems requiring full duplex I/O expansion.
Availability
AD1838AAS is available at Aetrix Electronics and suitable for DVD video players, home theater receivers, and automotive infotainment systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD1838AAS 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.
The AD1838AAS belongs to Analog Devices' professional audio codec product line, designed specifically for multichannel consumer and automotive audio systems demanding low THD+N, high SNR, and flexible digital interface architecture.
FAQ
What is the maximum sample rate supported by the AD1838AAS ADC?
The AD1838AAS ADC supports up to 96 kHz sample rate, achieved using IMCLK/256 decimation (e.g., 24.576 MHz MCLK ÷ 256 = 96 kHz). At 48 kHz, it uses IMCLK/512. The ADC does not support 192 kHz operation - that capability is exclusive to DAC1.
Does the AD1838AAS support I²S format on both ADC and DAC serial ports?
Yes, the AD1838AAS defaults to I²S mode for both ADC and DAC serial data ports. The ADC serial output and DAC serial input can be independently reconfigured to right-justified, left-justified, DSP, or packed TDM modes via control register programming.
What is the function of the FILTR pin on the AD1838AAS?
The FILTR pin provides access to the AD1838AAS's internal 2.25 V voltage reference. It must be bypassed with a parallel 10 µF aluminum + 100 nF ceramic capacitor placed near the pin. This reference sets the common-mode voltage for all analog I/O and may bias external op amps, but load current must stay below 50 µA.
Can the AD1838AAS operate with a 3.3 V digital interface while using 5 V analog supplies?
Yes - the AD1838AAS features a dedicated ODVDD pin that accepts 3.0 V to DVDD (5.0 V), enabling direct connection to 3.3 V DSPs, FPGAs, or microcontrollers without level-shifting circuitry, while AVDD and DVDD remain at 5 V for optimal analog performance.
How many differential analog outputs does the AD1838AAS provide?
The AD1838AAS provides six fully differential analog outputs: three stereo pairs (OUTLP1/OUTLN1, OUTRP1/OUTRN1, etc.), each with independent volume control and clickless mute. All outputs swing ±1.4 V around a 2.25 V common-mode voltage.
AD1838AAS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 52-QFP
- Packaging:
- Bag
- 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)
AD1838AAS FAQ
1.How can I place an order for AD1838AAS through Aetrix?
Please submit a Request for Quotation (RFQ) for AD1838AAS 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 AD1838AAS reliable?
The price and inventory of AD1838AAS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD1838AAS is usually 5 days.
3.What payment methods are accepted for AD1838AAS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD1838AAS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD1838AAS?
AD1838AAS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD1838AAS 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 AD1838AAS?
For technical support, including AD1838AAS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD1838AAS requirements.
6.How does Aetrix verify that AD1838AAS is sourced from the original manufacturer or authorized distributors?
All AD1838AAS 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 AD1838AAS meets industry standards.
7.What is the process for return or replacement of AD1838AAS?
All AD1838AAS units undergo pre-shipment inspection (PSI). If there is an issue with AD1838AAS, 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 AD1838AAS part is unused and in its original packaging.
Return procedure for AD1838AAS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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