My Inquiry
My Account
Analog Devices Inc. AD1838AS-REEL
- Part No.:
- AD1838AS-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- CODECS
- Package:
- 52-QFP
- Datasheet:
-
AD1838AS-REEL.pdf
- Description:
- IC CODEC 2ADC/6DAC 24 BIT 52MQFP
- Quantity:
- Payment:
- Shipping:
Inventory:770
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AD1838AS-REEL from Analog Devices is a high-performance 24-bit stereo audio codec IC integrating three independent stereo DACs (6 channels) and one stereo ADC (2 channels), supporting up to 96 kHz sampling on ADC and 192 kHz on DAC1, with differential analog I/O, on-chip 2.25 V reference, and SPI-compatible control interface - used in multichannel home theater audio systems requiring low THD+N and high SNR.
For engineers reviewing the AD1838AS-REEL datasheet, AD1838AS-REEL pinout, AD1838AS-REEL application, or AD1838AS-REEL equivalent, this page delivers verified specifications, validated pin functions, confirmed TDM/auxiliary mode operation, real-world audio system integration context, and precise alternative part comparisons for multichannel digital audio design.
Technical Context
The AD1838AS-REEL implements multibit Σ-Δ modulation architecture in both ADC and DAC paths, with decimation filters (120 dB stop-band attenuation at 48/96 kHz) and interpolation filters (55–80 dB stop-band attenuation across 48/96/192 kHz). It supports flexible serial data formats including I²S, left/right-justified, DSP, and packed TDM modes.
Its dual-domain power architecture separates AVDD/DVDD (5 V) and ODVDD (3.0–5.0 V) supplies, enabling 3.3 V digital interfacing while maintaining 5 V analog performance. The device features independent 1024-step linear volume control per DAC channel, clickless mute, and digital de-emphasis - all programmable via a 16-bit SPI port operating up to 12.5 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| DAC Channels | 6-channel (3 stereo pairs), each with independent volume control and differential output |
| ADC Channels | 2-channel stereo ADC with fully differential inputs and shared serial clocking |
| Max Sample Rate | 96 kHz on ADC; 192 kHz on DAC1 only (DAC2/DAC3 limited to 96 kHz) |
| SNR / THD+N | ADC: 105 dB SNR, –95 dB THD+N; DAC: 108 dB SNR, –95 dB THD+N (20 Hz–20 kHz) |
| Dynamic Range | ADC: 105 dB A-weighted; DAC: 108 dB A-weighted (–60 dBFS input) |
| Volume Control | 1024 linear steps (0.098% step size), 60 dB max attenuation per DAC channel |
| Reference Voltage | On-chip 2.25 V reference (FILTR pin), usable for external op-amp biasing |
Pinout & Package
AD1838AS-REEL is housed in a 52-lead MQFP (S-52) package with exposed thermal pad, rated for industrial temperature range (–40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUTLP1/OUTLN1 | DAC1 Left Channel Differential Output | Drives balanced load; common-mode voltage = 2.25 V; ±1.4 V swing at 0 dBFS |
| OUTRP1/OUTRN1 | DAC1 Right Channel Differential Output | Independent of other DAC pairs; supports stereo replicate mode to DAC2/DAC3 |
| ADCLP/ADCLN | ADC Left Channel Differential Input | Fully differential input with 4 kΩ impedance and ±2.828 V full-scale range |
| ADCRP/ADCRN | ADC Right Channel Differential Input | Shared decimation filter; group delay = 460 µs at 96 kHz |
| MCLK | Master Clock Input | Accepts 12.288 MHz (48 kHz), 24.576 MHz (96 kHz), or 49.152 MHz (192 kHz) for internal IMCLK generation |
| CCLK/CLATCH/CIN/COUT | SPI-Compatible Control Port | 16-bit command interface; CCLK ≤ 12.5 MHz; asynchronous to audio clocks |
| DLRCLK/DBCLK/DSDATA1–3 | DAC Serial Data Interface | Supports I²S, LJ/RJ/DSP, or Packed 256 TDM mode (8-in/8-out with auxiliary mode) |
| ALRCLK/ABCLK/ASDATA | ADC Serial Data Interface | Configurable as master or slave; M/S pin selects direction of ABCLK/ALRCLK |
| FILTD/FILTR | Filter Capacitor Connections | FILTD: reduces DAC bias noise (10 µF/100 nF); FILTR: bypasses 2.25 V reference (same) |
| PD/RST | Power-Down/Reset Input | Active-low; resets registers and initiates ~20 LRCLK-cycle initialization sequence |
Key Features
| Feature | Design Value |
|---|---|
| Data-directed scrambling DACs | Minimizes jitter sensitivity - critical for low-noise audio playback with imperfect clock sources |
| Differential analog I/O | Improves PSRR (–75 dB at 20 kHz) and common-mode noise rejection in noisy PCB environments |
| TDM auxiliary interface | Enables glueless 8-in/8-out expansion using single SHARC SPORT, redefining pins per Table II |
| Flexible serial port modes | Hardware-selectable I²S/LJ/RJ/DSP/Packed 256 - eliminates need for external format conversion logic |
| On-chip 2.25 V reference | Provides stable bias for external op-amps; current-limited to <50 µA to preserve accuracy |
Applications
| DVD Audio Processing | Home Theater Receiver |
|---|---|
Use Scenario: Multichannel PCM decoding and analog output routing in DVD-Audio players supporting 5.1/6.1 discrete audio tracks. IC Role / Device Role / Timing Role: Primary audio codec handling simultaneous DAC playback (DAC1–DAC3) and optional ADC monitoring (e.g., microphone input for karaoke). Use Value: 108 dB DAC SNR and 1024-step volume control enable high-fidelity, dynamically adjustable multichannel output without external attenuators. | Use Scenario: Central audio processing unit in 7.1-channel AV receivers, managing HDMI/SPDIF inputs, DSP effects, and multi-zone analog outputs. IC Role / Device Role / Timing Role: Core codec providing 6 DAC channels for main zone and 2 ADC channels for line-in monitoring, synchronized via shared MCLK. Use Value: TDM auxiliary mode allows seamless connection to SHARC DSP for real-time effects processing - no glue logic required. |
| Automotive Infotainment | Digital Audio Effects Processor |
Use Scenario: Audio subsystem in premium automotive head units supporting rear-seat entertainment, active noise cancellation feedback, and voice command capture. IC Role / Device Role / Timing Role: Dual-role codec: DACs drive amplified speaker outputs; ADCs acquire cabin mic signals with high PSRR against engine EMI. Use Value: –75 dB PSRR at 20 kHz and differential inputs suppress ignition noise, ensuring clean voice capture in noisy environments. | Use Scenario: Standalone effects unit (reverb, chorus, pitch shift) accepting digital input, applying DSP algorithms, and returning processed analog output. IC Role / Device Role / Timing Role: High-precision converter bridging FPGA-based DSP core and analog output stage; operates in master mode for deterministic timing. Use Value: 192 kHz DAC1 capability enables ultrahigh-resolution effects rendering; 0.098% volume step resolution supports fine-grained gain staging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel audio codec applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AK4118VN | 4-channel DAC + 2-channel ADC; supports 192 kHz on all DACs; no TDM auxiliary mode; 3.3 V only digital I/O | Targeted at compact 4.0/4.1 systems; lacks 8-in/8-out expansion path | Choose when full 192 kHz DAC concurrency is required and SHARC TDM integration is unnecessary |
| CS42526-CQZ | 6-channel DAC + 2-channel ADC; 100 dB SNR (DAC); supports 96 kHz only; integrated headphone amp; no FILTR pin | Better suited for portable/low-power designs; includes analog output drivers | Choose when integrated headphone drive and lower power (45 mW analog supply) outweigh need for 108 dB SNR and external reference use |
Compared with AK4118VN and CS42526-CQZ, the AD1838AS-REEL uniquely combines 108 dB DAC SNR, on-chip 2.25 V reference accessibility, and hardware-supported TDM auxiliary mode for SHARC interfacing - making it optimal for high-end fixed-installation audio systems demanding expandability and precision.
Availability
AD1838AS-REEL is available at Aetrix Electronics and suitable for DVD audio players, home theater receivers, automotive infotainment systems, and digital audio effects processors requiring stable component supply and long-term industrial temperature support.
Supply support for AD1838AS-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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and connectivity.
The AD1838 product line was designed for professional and consumer multichannel audio systems requiring simultaneous high-resolution DAC/ADC conversion, flexible digital audio interfacing, and robust noise immunity in electrically noisy environments.
FAQ
What sample rates does the AD1838AS-REEL support on its ADC and DAC sections?
The AD1838AS-REEL supports up to 96 kHz on its stereo ADC. For DACs, DAC1 supports up to 192 kHz, while DAC2 and DAC3 are limited to 96 kHz maximum. All channels operate at 48 kHz by default with a 12.288 MHz MCLK. The MCLK scaler allows configuration for non-standard rates like 44.1 kHz using appropriate MCLK frequencies. This behavior is documented in the Functional Overview section of the AD1838AS-REEL datasheet.
Does the AD1838AS-REEL include an internal voltage reference, and can it be used externally?
Yes, the AD1838AS-REEL integrates a 2.25 V internal voltage reference accessible at the FILTR pin. It is intended to be bypassed with a parallel 10 µF/100 nF capacitor and can bias external op-amps to match the common-mode voltage (2.25 V) of the analog I/O pins. Current draw must remain below 50 µA to maintain accuracy. This functionality is explicitly specified in the AD1838AS-REEL Electrical Characteristics table and Functional Overview.
How many independent volume controls does the AD1838AS-REEL provide, and what is their resolution?
The AD1838AS-REEL provides six independent volume controls - one per DAC channel (three stereo pairs). Each offers 1024 linear steps over a 60 dB range, with a step size of 0.098%. Volume is adjusted via SPI writes to dedicated DAC control registers. This specification is confirmed in the AD1838AS-REEL Features list and Specifications table under "Volume Control Step Size" and "Volume Control Range".
Can the AD1838AS-REEL interface directly with a SHARC processor's SPORT without external logic?
Yes, the AD1838AS-REEL supports direct glueless connection to a SHARC SPORT using its TDM auxiliary mode. In this mode, pins such as ASDATA, DSDATA1, ALRCLK, ABCLK, and others are reconfigured per Table II to implement an 8-in/8-out TDM interface. The AD1838AS-REEL acts as TDM master or slave depending on M/S pin state, eliminating need for level shifters or protocol translators.
What is the purpose of the FILTD pin on the AD1838AS-REEL, and how should it be connected?
The FILTD pin on the AD1838AS-REEL connects to an external grounded capacitor (recommended 10 µF/100 nF) to reduce noise from the internal DAC bias circuitry, thereby lowering DAC output noise floor. Unlike FILTR, FILTD does not carry a reference voltage but serves a dedicated noise-filtering function in the analog output stage. This requirement is specified in the Pin Function Descriptions and Functional Overview sections of the AD1838AS-REEL documentation.
AD1838AS-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 52-QFP
- Packaging:
- Bulk
- 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)
AD1838AS-REEL FAQ
1.How can I place an order for AD1838AS-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD1838AS-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 AD1838AS-REEL reliable?
The price and inventory of AD1838AS-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD1838AS-REEL is usually 5 days.
3.What payment methods are accepted for AD1838AS-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD1838AS-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD1838AS-REEL?
AD1838AS-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD1838AS-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 AD1838AS-REEL?
For technical support, including AD1838AS-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD1838AS-REEL requirements.
6.How does Aetrix verify that AD1838AS-REEL is sourced from the original manufacturer or authorized distributors?
All AD1838AS-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 AD1838AS-REEL meets industry standards.
7.What is the process for return or replacement of AD1838AS-REEL?
All AD1838AS-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD1838AS-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 AD1838AS-REEL part is unused and in its original packaging.
Return procedure for AD1838AS-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AD1838AS-REEL Tags
-
NAU88C22YG
Nuvoton Technology Corporation
-
TLV320AIC3100IRHBR
Texas Instruments
-
DA7212-01UM2
Renesas
-
NAU8810YG
Nuvoton Technology Corporation
-
DA7218-00U32
Renesas
-
CMX655DQ6-TR1K
CML Micro
-
SGTL5000XNLA3
NXP Semiconductors
-
TLV320AIC3104IRHBR
Texas Instruments
-
MAX9867EWV+T
Analog Devices Inc./Maxim Integrated
-
MAX9860ETG+T
Analog Devices Inc./Maxim Integrated
-
TLV320AIC3106IRGZR
Texas Instruments
-
SGTL5000XNLA3R2
NXP Semiconductors
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
