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Analog Devices Inc. AD1835AASZ-REEL
- Part No.:
- AD1835AASZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- CODECS
- Package:
- 52-QFP
- Datasheet:
-
AD1835AASZ-REEL.pdf
- Description:
- IC CODEC 2ADC/8DAC 24BIT 52MQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,272
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Product details
Overview
AD1835AASZ-REEL from Analog Devices is a high-performance, single-chip audio codec integrating one stereo 24-bit ADC and four stereo 24-bit DACs (8 total channels), supporting up to 96 kHz sample rates (192 kHz on DAC1), with differential analog I/O, on-chip 2.25 V reference, and SPI-compatible control interface - deployed in DVD audio players and home theater receivers requiring low THD+N and high dynamic range.
For engineers reviewing the AD1835AASZ-REEL datasheet, AD1835AASZ-REEL pinout, AD1835AASZ-REEL application, or AD1835AASZ-REEL equivalent, key selection criteria include its 52-lead MQFP package, 105 dB ADC SNR (A-weighted), 108 dB DAC SNR (A-weighted), –95 dB THD+N at 48/96 kHz, independent 1024-step volume control per DAC channel, and TDM256 mode for 8-in/8-out interfacing with SHARC® SPORTs.
Technical Context
The AD1835AASZ-REEL implements multibit Σ-Δ modulation with Analog Devices' patented differential linearity restoration in both ADC and DAC paths, reducing idle tones and noise floor. Its decimation filters (120 dB stop-band attenuation) and interpolation filters (55–80 dB stop-band attenuation across 48/96/192 kHz) deliver linear-phase response and precise group delay control (460–910 µs for ADC; 110–340 µs for DAC).
Digital interface flexibility includes I²S-, left/right-justified-, DSP-, and TDM-compatible serial modes; master/slave clocking via MCLK, ABCLK/ALRCLK (ADC), DBCLK/DLRCLK (DAC), and auxiliary TDM ports; plus SPI-based register programming for volume, mute, de-emphasis, and sample rate configuration - all operating from dual 5 V supplies with 3.3 V-tolerant digital I/O (ODVDD).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ADC Resolution | 24-bit - Enables 105 dB A-weighted dynamic range and –95 dB THD+N at 48/96 kHz for high-fidelity capture. |
| DAC Resolution | 24-bit - Delivers 108 dB A-weighted dynamic range and –95 dB THD+N, supporting studio-grade playback fidelity. |
| Max Sample Rate | 96 kHz (ADC & 7 DACs); 192 kHz (DAC1 only) - Allows high-resolution audio processing and stereo replicate to other DACs. |
| Analog I/O Type | Fully differential inputs (ADC) and outputs (DAC) - Improves PSRR (–75 dB at 20 kHz), reduces common-mode noise, and enables >110 dB interchannel isolation. |
| Volume Control | 1024-step linear scale per DAC channel - Provides 0.098% step resolution and 60 dB attenuation range for precise channel balancing. |
| Digital Interface | Flexible serial port: I²S/right/left-justified/DSP/TDM256/TDM512 + SPI control - Enables glueless connection to SHARC® DSPs, AES/EBU receivers, and sample-rate converters. |
| Reference Voltage | 2.25 V internal VREF (FILTR pin) - Stabilizes common-mode bias for analog I/O and supports external op-amp biasing with <50 µA draw. |
Pinout & Package
AD1835AASZ-REEL is housed in a 52-lead MQFP (S-52-1) package with exposed thermal pad, rated for industrial temperature range (–40°C to +85°C). Pin layout supports symmetric analog/digital ground separation (5 AGND, 2 DGND), dedicated AVDD/DVDD/ODVDD supplies, and 8 differential DAC output pairs (OUTLPx/OUTLNx/OUTRPx/OUTRNx) plus stereo ADC inputs (ADCLP/ADCLN/ADCRP/ADCRN).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 39 DVDD | Digital power supply input | 5 V supply for digital core and I/O; requires local 100 nF ceramic bypass. |
| 5, 10, 16, 24, 30, 35 AGND | Analog ground reference | Common return for analog sections; must be isolated from DGND except at single-point star ground. |
| 6–9, 12–15, 26–28, 32–34 OUTLNx/OUTLPx/OUTRNx/OUTRPx | Differential DAC analog outputs | Eight fully differential outputs (4 stereo pairs); each swings ±1.4 V around 2.25 V common-mode for 0 dBFS. |
| 20–23 ADCLN/ADCLP/ADCRN/ADCRP | Differential ADC analog inputs | Stereo differential inputs with ±2.828 V full-scale range and 4 kΩ input impedance. |
| 37 DLRCLK / 38 DBCLK / 45 ABCLK / 46 ALRCLK | Serial data clock and frame sync | Configurable as master (output) or slave (input); supports TDM256/512 for 8-channel I/O on single data lines. |
| 41–44 DSDATAx | DAC serial data inputs | Four independent 24-bit serial inputs (one per stereo DAC pair); also supports packed-mode routing via DSDATA1. |
| 47 MCLK | Master clock input | Accepts 12.288 MHz (256×fS @ 48 kHz); internal scaler supports ×1, ×2, or ×2/3 for IMCLK ≤24.576 MHz. |
| 49 ASDATA | ADC serial data output | I²S-default output carrying stereo ADC data; format programmable via ADC Control Register 2 (Bits 6–8). |
| 2, 3, 50, 51 CLATCH/CIN/COUT/CCLK | SPI-compatible control port | 16-bit command interface for register writes/reads; max 12.5 MHz CCLK; asynchronous to audio clocks. |
Key Features
| Feature | Design Value |
|---|---|
| Data-directed scrambling DACs | Minimizes sensitivity to clock jitter - critical for maintaining –95 dB THD+N when using crystal oscillators with <300 ps rms jitter. |
| Perfect differential linearity restoration | Eliminates harmonic distortion from DAC nonlinearity, enabling –95 dB THD+N without post-filter trimming. |
| On-chip digital de-emphasis | Programmable 50/15 µs response per DAC channel - matches pre-emphasized CD/DVD source material without external logic. |
| Clickless software mute | Zero-crossing detection and ramped attenuation prevent pop/click artifacts during muting/unmuting of any DAC channel. |
| Soft power-down mode | Reduces analog supply current from 95 mA to 67 mA while retaining register state - enables fast wake-up without reconfiguration. |
Applications
| DVD Audio Playback System | Home Theater AV Receiver |
|---|---|
Use Scenario: Decoding multi-channel PCM and Dolby Digital bitstreams into analog outputs for 5.1/7.1 speaker systems. IC Role / Device Role / Timing Role: Primary audio codec handling simultaneous 8-channel DAC playback and stereo ADC monitoring via TDM256 interface. Use Value: 108 dB DAC SNR and 110 dB interchannel isolation preserve spatial imaging and dialog clarity across discrete channels. |
Use Scenario: Bridging digital audio sources (HDMI, optical SPDIF) to analog preamp stages with real-time format conversion and level control. IC Role / Device Role / Timing Role: Central audio hub managing sample rate translation, de-emphasis, and independent volume control per zone (main, zone2, subwoofer). Use Value: 1024-step linear volume scaling per DAC channel enables precise channel matching and room correction calibration. |
| Automotive Infotainment Head Unit | Digital Audio Effects Processor |
Use Scenario: Driving high-voltage analog outputs to car amplifier inputs while rejecting engine noise and EMI. IC Role / Device Role / Timing Role: ADC captures microphone array input; DACs feed amplified speaker outputs with differential signaling and 2.25 V common-mode bias. Use Value: –75 dB PSRR at 20 kHz prevents alternator ripple from modulating audio output; 85°C operation ensures reliability under dash heat. |
Use Scenario: Real-time multi-effects processing (reverb, chorus, EQ) with ultra-low latency loopback between DSP and codec. IC Role / Device Role / Timing Role: Low-latency ADC-to-DAC path using shared MCLK and synchronized LRCLK; SPI port configures effects parameters dynamically. Use Value: 110 µs DAC group delay at 192 kHz enables sub-sample alignment for time-critical FIR filtering and pitch-shifting algorithms. |
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 + 24-bit, 192 kHz stereo DAC; no multi-DAC architecture; lacks TDM256 mode and on-chip de-emphasis. | Targeted at 2-channel pro-audio interfaces rather than multi-zone consumer AV systems. | Select AK4118VN when needing higher single-channel sample rates over 96 kHz and lower pin count, but not 8-channel DAC capability. |
| CS4382-KQZ | 8-channel 24-bit, 192 kHz DAC only (no ADC); uses delta-sigma architecture with 114 dB SNR; requires external ADC and SPI control logic. | Used in DAC-only subsystems where ADC functionality is handled by separate components or SoCs. | Select CS4382-KQZ when system already includes a high-performance ADC and demands best-in-class DAC SNR (114 dB) without integrated ADC overhead. |
Compared with AK4118VN and CS4382-KQZ, the AD1835AASZ-REEL uniquely integrates 1 ADC + 8 DAC channels in one 52-pin MQFP, supports TDM256 for 8-in/8-out on a single SHARC SPORT, and delivers matched 105/108 dB SNR with on-chip de-emphasis - making it optimal for space-constrained, multi-zone consumer audio designs requiring full signal chain integration.
Availability
AD1835AASZ-REEL is available at Aetrix Electronics and suitable for DVD video/audio players, home theater receivers, and automotive infotainment systems requiring stable component supply, long-lifecycle support, and Pb-free compliance (RoHS-compliant S-52-1 package).
Supply support for AD1835AASZ-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 design centers worldwide and a legacy of innovation in precision data conversion and audio technology.
The AD1835AASZ-REEL belongs to Analog Devices' high-fidelity audio codec product line, engineered specifically for multi-channel consumer and professional audio systems demanding simultaneous high-resolution ADC and DAC operation with minimal external components and flexible digital interfacing.
FAQ
What is the maximum supported sample rate for the ADC section of the AD1835AASZ-REEL?
The AD1835AASZ-REEL ADC supports a maximum sample rate of 96 kHz, achieved using an IMCLK/256 decimation ratio. While DAC1 accepts 192 kHz input, the ADC section is limited to 96 kHz per the device's decimator architecture and specified timing constraints. The ADC Control 1 register must be configured with bit 7 set to '1' to enable the 96 kHz mode.
Does the AD1835AASZ-REEL support I²S serial interface mode out of the box?
Yes, the AD1835AASZ-REEL defaults to I²S mode for both ADC output (ASDATA) and DAC input (DSDATAx). The ADC serial output is delayed by one BCLK from the LRCLK edge in default configuration, and DAC input follows standard I²S timing. Mode selection is programmable via ADC Control Register 2 (Bits 6–8) and DAC Control Register 1 (Bits 5–7).
How many independent volume controls does the AD1835AASZ-REEL provide?
The AD1835AASZ-REEL provides eight independent volume controls - one per DAC channel (four left, four right), each adjustable in 1024 linear steps across a 60 dB range. Volume settings are stored in dedicated DAC Control Registers and updated via the SPI port without interrupting audio streaming.
Can the AD1835AASZ-REEL operate with a 3.3 V digital interface while using 5 V analog supplies?
Yes, the AD1835AASZ-REEL supports mixed-supply operation: AVDD and DVDD are 5 V, while ODVDD (digital I/O driver supply) can be set to 3.3 V, enabling direct interfacing with 3.3 V DSPs, FPGAs, or microcontrollers without level shifters. Input voltage thresholds remain compatible, and output drive strength adapts to ODVDD.
What is the purpose of the FILTD and FILTR pins on the AD1835AASZ-REEL?
FILTD connects to an external capacitor (recommended 10 µF || 100 nF) to filter noise from the internal DAC bias circuitry, directly lowering DAC output noise floor. FILTR exposes the internal 2.25 V reference voltage and must be bypassed with the same capacitor network to stabilize common-mode voltage for analog I/O and enable external op-amp biasing.
AD1835AASZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 52-QFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- 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)
AD1835AASZ-REEL FAQ
1.How can I place an order for AD1835AASZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD1835AASZ-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 AD1835AASZ-REEL reliable?
The price and inventory of AD1835AASZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD1835AASZ-REEL is usually 5 days.
3.What payment methods are accepted for AD1835AASZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD1835AASZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD1835AASZ-REEL?
AD1835AASZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD1835AASZ-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 AD1835AASZ-REEL?
For technical support, including AD1835AASZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD1835AASZ-REEL requirements.
6.How does Aetrix verify that AD1835AASZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD1835AASZ-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 AD1835AASZ-REEL meets industry standards.
7.What is the process for return or replacement of AD1835AASZ-REEL?
All AD1835AASZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD1835AASZ-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 AD1835AASZ-REEL part is unused and in its original packaging.
Return procedure for AD1835AASZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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