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Analog Devices Inc. AD1835AAS-REEL
- Part No.:
- AD1835AAS-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- CODECS
- Package:
- 52-QFP
- Datasheet:
-
AD1835AAS-REEL.pdf
- Description:
- IC CODEC 2ADC/8DAC 24 BIT 52MQFP
- Quantity:
- Payment:
- Shipping:
Inventory:27,620
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Product details
Overview
AD1835AAS-REEL from Analog Devices is a high-performance, single-chip audio codec integrating one stereo 24-bit ADC and four stereo 24-bit DACs (eight total DAC channels), supporting up to 96 kHz sample rates (192 kHz on DAC1), with differential analog I/O, on-chip 1024-step volume control per channel, and SPI-compatible digital control interface - deployed in DVD audio players and home theater receivers.
For engineers reviewing the AD1835AAS-REEL datasheet, AD1835AAS-REEL pinout, AD1835AAS-REEL application, or AD1835AAS-REEL equivalent, key selection considerations include its 52-lead MQFP package, dual-supply 5 V analog/digital operation with 3.3 V-tolerant digital I/O, differential output architecture for noise immunity, and TDM256 mode enabling 8-in/8-out audio via single SHARC SPORT interface.
Technical Context
The AD1835AAS-REEL implements sigma-delta modulation with multibit DACs featuring data-directed scrambling for jitter insensitivity and perfect differential linearity restoration to suppress idle tones. Its ADC section uses decimation filters with 120 dB stop-band attenuation and linear phase response at 48 kHz/96 kHz.
DAC interpolation filters support 48 kHz, 96 kHz, and 192 kHz modes with pass-band ripple ≤ ±0.06 dB and group delay as low as 110 µs; ADC decimation filters provide 910 µs (48 kHz) or 460 µs (96 kHz) group delay, both with 0.01 dB pass-band ripple and 21.77 kHz / 43.54 kHz pass bands respectively.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ADC Resolution | 24-bit - Enables >105 dB dynamic range and high-fidelity digitization of studio-grade audio signals. |
| DAC Resolution | 24-bit - Supports 108 dB SNR and <–95 dB THD+N for low-noise playback across all eight channels. |
| Max Sample Rate | 96 kHz (ADC & DACs), 192 kHz (DAC1 only) - Meets DVD-Audio and high-res consumer audio timing requirements. |
| Analog I/O Type | Fully differential inputs/outputs - Reduces common-mode noise and improves PSRR (>–75 dB at 20 kHz). |
| Volume Control | 1024-step linear scale (0.098% step size, 60 dB range) - Enables precise channel-matched gain adjustment without audible stepping artifacts. |
| Digital Interface | SPI control port + four independent DAC serial ports (I²S/right/left/DSP/TDM) - Allows flexible glueless interfacing to SHARC DSPs, AES/EBU receivers, and sample-rate converters. |
| Power Supply | AVDD/DVDD = 4.5–5.5 V; ODVDD = 3.0–DVDD - Enables mixed-voltage system integration with 3.3 V logic while maintaining full analog performance. |
Pinout & Package
AD1835AAS-REEL is housed in a 52-lead MQFP (S-52-1) package with exposed thermal pad, optimized for industrial temperature range (–40°C to +85°C) and board-level ESD robustness (4 kV HBM).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUTLP1–OUTRP4 | Differential DAC analog outputs (8 channels) | Each pair delivers 1.0 Vrms (2.8 Vp-p) full-scale signal centered at 2.25 V common-mode voltage; requires external third-order LPF for reconstruction. |
| ADCLP/ADCLN, ADCRP/ADCRN | Differential stereo ADC analog inputs | Accept ±2.828 V full-scale differential input; 4 kΩ input impedance and 15 pF capacitance define anti-aliasing filter design constraints. |
| MCLK, PD/RST, DSDATA1–4, ASDATA | Master clock, power-down/reset, DAC/ADC serial data | MCLK supports 256/512/768× fS scaling; PD/RST asserts soft power-down and resets internal registers; DSDATAx enable independent stereo DAC streaming. |
| DLRCLK/DBCLK, ALRCLK/ABCLK | DAC/ADC frame and bit clocks | Configurable as master or slave via M/S pin; support normal, packed (128/256), and TDM modes for scalable channel count and timing flexibility. |
| CIN/CLATCH/CCLK/COUT | SPI-compatible 4-wire control interface | 16-bit command format; CCLK up to 12.5 MHz; enables real-time register access for volume, mute, de-emphasis, and filter configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Data-directed scrambling DACs | Minimizes sensitivity to master clock jitter (<300 ps rms), preventing tone generation and noise floor degradation in noisy system environments. |
| Perfect differential linearity restoration | Eliminates harmonic distortion from DAC nonlinearity, achieving –95 dB THD+N and enabling clean multi-channel audio reproduction. |
| On-chip 2.25 V reference (FILTR pin) | Provides stable bias for external op-amps and ensures consistent common-mode voltage across all analog I/O pins, reducing inter-channel gain mismatch (0.025 dB max). |
| Clickless software-controllable mute | Prevents pop/click transients during power-up, channel switching, or volume ramping by synchronizing mute activation with zero-crossing detection. |
| TDM256 interface mode | Supports 8-in/8-out audio over single SHARC SPORT with 256 BCLK/frame, eliminating need for multiple serial ports and simplifying PCB routing. |
Applications
| DVD Audio Playback System | Home Theater AV Receiver |
|---|---|
Use Scenario: Decoding and rendering multi-channel PCM and Dolby Digital audio streams from DVD media into analog speaker outputs. IC Role / Device Role / Timing Role: Central audio codec handling simultaneous 8-channel DAC playback and stereo ADC capture for microphone input or analog source digitization. Use Value: Differential outputs reduce crosstalk between surround channels; 108 dB DAC SNR preserves dynamic range of high-resolution content; TDM256 enables compact connection to SHARC-based audio processors. |
Use Scenario: Integrating digital audio sources (HDMI, optical SPDIF) with analog preamp and power amplifier stages in 5.1/7.1 channel systems. IC Role / Device Role / Timing Role: High-fidelity analog front-end providing synchronized 8-channel DAC output and stereo ADC input for room correction feedback loops. Use Value: 1024-step volume control allows precise channel-balanced level trimming; A-weighted 108 dB dynamic range meets THX reference playback standards; 3.3 V-tolerant I/O simplifies interface to modern SoC controllers. |
| Automotive Infotainment Head Unit | Digital Audio Effects Processor |
Use Scenario: Delivering multi-zone audio (front/rear, driver/passenger) with active noise cancellation and hands-free telephony in vehicle cabins. IC Role / Device Role / Timing Role: Dual-role codec performing real-time ADC acquisition of cabin microphones and DAC playback of processed audio to multiple speaker zones. Use Value: Industrial temp rating (–40°C to +85°C) ensures reliability under hood heat; differential I/O rejects engine EMI; soft power-down minimizes quiescent current during sleep mode. |
Use Scenario: Hosting real-time FIR/IIR filtering, reverb, and equalization algorithms on SHARC DSPs with low-latency analog I/O loopback. IC Role / Device Role / Timing Role: Low-jitter, low-latency audio interface bridging SHARC SPORTs to analog domain with deterministic group delay (110–910 µs). Use Value: Data-directed scrambling DACs maintain fidelity despite clock distribution skew; packed-mode serial I/O reduces pin count and PCB layer count; 192 kHz DAC1 supports ultrasonic test tone generation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar audio codec applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AK4118VN | 24-bit, 192 kHz stereo ADC + stereo DAC; lacks multi-DAC architecture and TDM256 mode; SPI control only. | Targeted at 2-channel professional audio interfaces, not multi-channel consumer AV systems. | Select AK4118VN when dual-channel simplicity and lower pin count outweigh need for 8-channel DAC scalability. |
| CS4382-KQZ | 8-channel 24-bit DAC only (no ADC); supports 192 kHz on all channels; no integrated volume control or digital filters. | Requires external ADC and separate control logic; suited for DAC-only playback subsystems. | Choose CS4382-KQZ when system already includes discrete ADC and demands highest DAC channel density without shared resources. |
Compared with AK4118VN and CS4382-KQZ, the AD1835AAS-REEL uniquely integrates both multi-DAC and stereo ADC in one die with TDM256 and SPI control - enabling complete 8-in/8-out audio subsystems with minimal external components and deterministic latency.
Availability
AD1835AAS-REEL is available at Aetrix Electronics and suitable for DVD video/audio players, home theater receivers, and automotive infotainment systems requiring stable component supply across extended production lifecycles.
Supply support for AD1835AAS-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with deep expertise in precision data conversion and audio technology.
The AD1835AAS-REEL belongs to Analog Devices' high-fidelity audio codec product line, engineered specifically for multi-channel consumer and automotive audio systems demanding low THD+N, wide dynamic range, and flexible digital interface compatibility.
FAQ
What is the maximum supported sample rate for the ADC section of the AD1835AAS-REEL?
The AD1835AAS-REEL ADC section supports a maximum sample rate of 96 kHz, achieved using IMCLK/256 decimation mode. At 48 kHz, it operates at IMCLK/512. The ADC does not support 192 kHz sampling; that capability is exclusive to DAC1 within the AD1835AAS-REEL device.
Does the AD1835AAS-REEL support I²S interface mode for both ADC and DAC data ports?
Yes, the AD1835AAS-REEL supports I²S mode by default on both ADC and DAC serial ports. The ADC serial output defaults to I²S, and DAC serial inputs can be configured to I²S via DAC Control Register 1 Bits 5–7. Both interfaces also support right-justified, left-justified, and DSP modes.
How many independent volume controls does the AD1835AAS-REEL provide, and what is their resolution?
The AD1835AAS-REEL provides eight independent volume controls - one per DAC channel - each implemented as a 1024-step linear attenuator. Each step corresponds to 0.098% gain change, delivering a total attenuation range of 60 dB with monotonic response and no audible stepping artifacts.
What is the purpose of the FILTD and FILTR pins on the AD1835AAS-REEL?
FILTD connects to an external capacitor (recommended 10 µF || 100 nF) to reduce noise from the internal DAC bias circuitry, directly lowering DAC output noise floor. FILTR brings out the internal 2.25 V reference voltage and must be bypassed similarly to stabilize common-mode voltage for analog I/O and external op-amp biasing.
Can the AD1835AAS-REEL operate with separate analog and digital power supplies?
Yes, the AD1835AAS-REEL features dedicated AVDD (analog) and DVDD (digital) supply pins, plus ODVDD for digital output drivers. It is designed for separate 5 V analog and digital supplies, with recommended ferrite bead isolation if sharing a single rail - ensuring optimal PSRR (>–75 dB) and SNR performance.
AD1835AAS-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 / 8
- 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)
AD1835AAS-REEL FAQ
1.How can I place an order for AD1835AAS-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD1835AAS-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 AD1835AAS-REEL reliable?
The price and inventory of AD1835AAS-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD1835AAS-REEL is usually 5 days.
3.What payment methods are accepted for AD1835AAS-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD1835AAS-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD1835AAS-REEL?
AD1835AAS-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD1835AAS-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 AD1835AAS-REEL?
For technical support, including AD1835AAS-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD1835AAS-REEL requirements.
6.How does Aetrix verify that AD1835AAS-REEL is sourced from the original manufacturer or authorized distributors?
All AD1835AAS-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 AD1835AAS-REEL meets industry standards.
7.What is the process for return or replacement of AD1835AAS-REEL?
All AD1835AAS-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD1835AAS-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 AD1835AAS-REEL part is unused and in its original packaging.
Return procedure for AD1835AAS-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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