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Analog Devices Inc. AD1838AASZ
- Part No.:
- AD1838AASZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- CODECS
- Package:
- 52-QFP
- Datasheet:
-
AD1838AASZ.pdf
- Description:
- IC CODEC 2ADC/6DAC 24 BIT 52MQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,337
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Product details
Overview
AD1838AASZ 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), operating on dual 5 V analog/digital supplies with 3.3 V–tolerant digital I/O. It delivers –95 dB THD+N and 108 dB DAC SNR, supports I²S/Left-Justified/DSP/TDM serial formats, and integrates on-chip 2.25 V reference and 1024-step linear volume control per channel - used in DVD players, home theater receivers, and automotive audio head units.
For engineers reviewing the AD1838AASZ datasheet, AD1838AASZ pinout, AD1838AASZ application, or AD1838AASZ equivalent, this page provides verified functional identity, validated 52-lead MQFP package mapping, confirmed differential ADC/DAC architecture, real-world timing constraints (e.g., 256× fS MCLK, 300 ps RMS jitter limit), and two field-validated alternative codecs for multi-DAC audio system design.
Technical Context
The AD1838AASZ implements three independent 24-bit multibit ΔΣ DACs with programmable interpolation filters (supporting 48/96/192 kHz on DAC1), each featuring differential voltage outputs, 60 dB attenuation range, and clickless mute. Its stereo ADC uses 24-bit multibit ΔΣ conversion with decimation filters offering 120 dB stop-band attenuation and group delay of 460 µs at 96 kHz.
Serial interface flexibility includes master/slave configurable ADC/DAC ports, TDM256/512 modes for 8-in/8-out operation via SHARC SPORT, auxiliary 3× stereo ADC + 1× stereo DAC expansion, and SPI-compatible 16-bit control port with 12.5 MHz max clock - all operating across –40°C to +85°C with guaranteed functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| DAC Channels | 6-channel (3 stereo pairs), fully differential outputs with ±1.4 V swing at 0 dBFS |
| ADC Resolution | 24-bit stereo, differential inputs with ±2.828 V input range and 2.25 V common-mode voltage |
| Dynamic Range | 108 dB (DAC, A-weighted, 48/96 kHz); 105 dB (ADC, A-weighted, 48 kHz) |
| THD+N | –95 dB (both DAC and ADC at 48/96 kHz, 20 Hz–20 kHz bandwidth) |
| Sample Rates | ADC: up to 96 kHz (IMCLK/256 or IMCLK/512); DAC: 48/96 kHz (all channels), 192 kHz (DAC1 only) |
| Reference Voltage | On-chip 2.25 V reference (FILTR pin), bypassed with 10 µF + 100 nF for optimal noise performance |
| Power Supply | AVDD/DVDD = 4.5–5.5 V; ODVDD = 3.0–DVDD; total dissipation = 740 mW (active), 280 mW (power-down) |
Pinout & Package
AD1838AASZ is housed in a 52-lead MQFP (S-52-1) package with exposed thermal pad, specified for industrial temperature range (–40°C to +85°C). Pin layout supports full differential analog I/O routing, dedicated control and serial data buses, and separate analog/digital ground/power domains.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUTLP1 / OUTLN1 OUTRP1 / OUTRN1 | DAC1 Left/Right Differential Output | Primary stereo DAC output pair; ±1.4 V swing around 2.25 V common-mode; requires external 3rd-order LPF |
| OUTLP2 / OUTLN2 OUTRP2 / OUTRN2 | DAC2 Left/Right Differential Output | Secondary stereo DAC pair; independent volume control and mute; identical specs to DAC1 |
| OUTLP3 / OUTLN3 OUTRP3 / OUTRN3 | DAC3 Left/Right Differential Output | Tertiary stereo DAC pair; supports stereo replicate mode from DAC1 data stream |
| ADCLP / ADCLN ADCRP / ADCRN | ADC Left/Right Differential Input | Fully differential inputs with 4 kΩ input impedance; 15 pF capacitance; referenced to 2.25 V common-mode |
| MCLK | Master Clock Input | Accepts 12.288 MHz (256× fS) or 24.576 MHz (512× fS); internal scaler supports ×1, ×2, or ×2/3 multiplication |
| DLRCLK / DBCLK DSDATA1–3 | DAC Serial Interface | Frame/bit clocks and three independent 24-bit data inputs; supports I²S, left/right-justified, DSP, and packed 256/512 modes |
| ALRCLK / ABCLK ASDATA | ADC Serial Interface | Configurable master/slave; ASDATA is single 24-bit output; supports TDM for 8-channel expansion |
| CIN / CCLK / CLATCH / COUT | SPI-Compatible Control Port | 16-bit command interface; CIN accepts register writes; COUT returns read data; CLATCH enables latch |
| FILTD / FILTR | Filter Capacitor Terminals | FILTD: reduces DAC bias noise (10 µF + 100 nF); FILTR: stabilizes 2.25 V reference (same cap values) |
| PD/RST | Power-Down/Reset Input | Active-low signal that resets registers, powers down analog/digital sections, and initiates 20-LRCLK initialization |
Key Features
| Feature | Design Value |
|---|---|
| Differential ΔΣ Architecture | Eliminates even-order harmonics and improves PSRR (–75 dB at 20 kHz); enables >105 dB SNR without external op-amps |
| Three Independent Stereo DACs | Enables multi-zone audio (e.g., front/rear/subwoofer) with per-channel 60 dB attenuation and clickless mute-no external DACs required |
| Flexible TDM Expansion | Supports 8-in/8-out via single SHARC SPORT using TDM256 mode-reduces PCB routing complexity and eliminates glue logic |
| Data-Directed Scrambling | Reduces sensitivity to clock jitter; maintains –95 dB THD+N even with 300 ps RMS jitter-critical for low-noise DAC output |
| On-Chip 2.25 V Reference | Provides stable common-mode bias for all analog I/O; eliminates need for external reference IC and associated noise coupling paths |
| 3.3 V–Tolerant Digital I/O | ODVDD pin allows direct interfacing to 3.3 V DSPs/FPGAs without level shifters-reduces BOM count and signal integrity risk |
Applications
| DVD Audio/Video Player | Home Theater AV Receiver |
|---|---|
Use Scenario: Playback of Dolby Digital and DTS bitstreams with multi-channel analog output to discrete amplifiers. IC Role / Device Role / Timing Role: Primary audio codec handling 6-channel DAC output (front L/R, center, surround L/R, subwoofer) and stereo ADC for microphone-based calibration. Use Value: 108 dB DAC SNR ensures clean high-resolution audio reproduction; TDM mode enables seamless integration with SHARC-based audio processors. |
Use Scenario: Real-time mixing of HDMI, optical, and coaxial digital sources into 7.1 analog outputs with room correction feedback. IC Role / Device Role / Timing Role: Central audio hub providing 6 DAC channels for main zones plus auxiliary ADC for microphone array input during auto-calibration. Use Value: Three independent stereo DACs eliminate need for multiple codecs; 24-bit resolution preserves dynamic range across full 20 Hz–20 kHz band. |
| Automotive Infotainment Head Unit | Digital Audio Effects Processor |
Use Scenario: Multi-source audio processing (Bluetooth, USB, tuner) with cabin EQ, loudness compensation, and speaker protection. IC Role / Device Role / Timing Role: Audio interface between SoC and analog power stages; ADC captures feedback from speaker current/voltage sensors. Use Value: –40°C to +85°C rating meets automotive qualification; differential I/O rejects engine EMI; 3.3 V–tolerant I/O matches SoC voltage domain. |
Use Scenario: High-fidelity reverb, chorus, and pitch-shifting effects requiring ultra-low-noise DAC output and precise ADC capture. IC Role / Device Role / Timing Role: Precision audio converter feeding DSP algorithms; supports 192 kHz sampling on DAC1 for oversampled effect rendering. Use Value: 192 kHz DAC capability on channel 1 enables high-fidelity effect tail rendering; data-directed scrambling minimizes jitter-induced artifacts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-DAC audio codec applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AK4384VT | 4-channel DAC (2 stereo), no integrated ADC; supports 192 kHz on all DACs; uses 3.3 V supply only | Lacks ADC and third DAC pair; requires external ADC for feedback loops or mic input | Choose when only DAC performance matters and ADC is handled externally; not suitable for codec-integrated designs. |
| CS4382-KQZ | 8-channel DAC (4 stereo), no ADC; 114 dB DAC SNR; supports 192 kHz; requires external reference | No ADC functionality; higher channel count but no analog input path; needs external 2.5 V reference | Select for pure multi-channel DAC applications where ADC is unnecessary and SNR >110 dB is critical. |
Compared with AK4384VT and CS4382-KQZ, AD1838AASZ uniquely combines three stereo DACs + stereo ADC in one 52-pin MQFP, retains on-chip 2.25 V reference, and supports TDM-based 8-in/8-out expansion-making it the only option for compact, self-contained, multi-zone audio systems requiring both high-fidelity conversion and embedded control.
Availability
AD1838AASZ is available at Aetrix Electronics and suitable for DVD players, home theater receivers, and automotive infotainment systems requiring stable component supply, long-lifecycle support, and industrial-grade temperature performance.
Supply support for AD1838AASZ 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 global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, communications, and industrial markets since 1965.
The AD1838AASZ belongs to Analog Devices' professional audio codec family, designed specifically for multi-channel consumer and automotive audio systems demanding simultaneous high-resolution DAC and ADC conversion with minimal external components.
FAQ
What is the maximum sample rate supported by the AD1838AASZ ADC and DAC sections?
The AD1838AASZ ADC supports up to 96 kHz (via IMCLK/256 mode), while its DAC section supports 48 kHz and 96 kHz on all six channels, plus 192 kHz on DAC1 only. This asymmetric capability enables high-fidelity rendering of effect tails or oversampled content on the primary DAC pair while maintaining synchronized playback across all channels at standard rates.
Does the AD1838AASZ require an external voltage reference?
No, the AD1838AASZ includes an internal 2.25 V reference brought out on the FILTR pin. It must be bypassed with a parallel 10 µF aluminum electrolytic and 100 nF ceramic capacitor placed as close as possible to the pin. This reference sets the common-mode voltage for all analog inputs and outputs and may also bias external op-amps in the signal chain.
How many independent volume controls does the AD1838AASZ provide?
The AD1838AASZ provides six independent 1024-step linear volume controls - one per DAC channel (left/right for each of the three stereo pairs). Each control offers 60 dB attenuation range with 0.098 dB step resolution and supports software-controlled clickless mute with –100 dB attenuation, enabling precise per-channel gain management in multi-zone audio systems.
Can the AD1838AASZ interface directly with a 3.3 V DSP without level shifters?
Yes, the AD1838AASZ features a dedicated ODVDD pin that powers its digital I/O buffers, allowing them to operate at 3.0 V to DVDD (max 5.5 V). When ODVDD is set to 3.3 V, all digital inputs (DBCLK, DLRCLK, etc.) accept 3.3 V–compatible logic levels, and outputs drive to ODVDD – 0.4 V high and 0.4 V low - enabling direct, glueless connection to 3.3 V DSPs and FPGAs.
What serial audio interface modes does the AD1838AASZ support for DAC and ADC data transfer?
The AD1838AASZ supports I²S, left-justified, right-justified, and DSP serial modes for both DAC and ADC ports - configurable independently via control registers. It also supports packed TDM256/TDM512 modes for 8-in/8-out operation and auxiliary TDM for interfacing with external ADCs/DACs, all synchronized to a single MCLK and compatible with SHARC SPORT interfaces.
AD1838AASZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 52-QFP
- Packaging:
- Tray
- 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 FAQ
1.How can I place an order for AD1838AASZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD1838AASZ 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 reliable?
The price and inventory of AD1838AASZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD1838AASZ is usually 5 days.
3.What payment methods are accepted for AD1838AASZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD1838AASZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD1838AASZ?
AD1838AASZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD1838AASZ 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?
For technical support, including AD1838AASZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD1838AASZ requirements.
6.How does Aetrix verify that AD1838AASZ is sourced from the original manufacturer or authorized distributors?
All AD1838AASZ 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 meets industry standards.
7.What is the process for return or replacement of AD1838AASZ?
All AD1838AASZ units undergo pre-shipment inspection (PSI). If there is an issue with AD1838AASZ, 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 part is unused and in its original packaging.
Return procedure for AD1838AASZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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