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Analog Devices Inc. AD1837AAS
- Part No.:
- AD1837AAS
- Manufacturer:
- Analog Devices Inc.
- Category:
- CODECS
- Package:
- 52-QFP
- Datasheet:
-
AD1837AAS.pdf
- Description:
- IC CODEC 2ADC/8DAC 24BIT 52-MQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,974
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Product details
Overview
AD1837AAS from Analog Devices is a high-performance 24-bit stereo audio codec integrating one 2-channel ADC and four independent 2-channel DACs (8 total DAC channels), supporting up to 96 kHz sample rates (192 kHz on DAC1 only), with –95 dB THD+N (ADC) and –92 dB THD+N (DAC), 105 dB SNR (ADC), 108 dB SNR (DAC), and 1024-step linear volume control per channel. It is used in multichannel home theater receivers requiring precise analog I/O synchronization and low-noise single-ended outputs.
For engineers reviewing the AD1837AAS datasheet, AD1837AAS pinout, AD1837AAS application, or AD1837AAS equivalent, this page delivers verified technical context, real-world timing constraints (e.g., 256× MCLK support, TDM256 mode), confirmed package mapping (52-lead MQFP), and validated alternatives for multichannel audio system design.
Technical Context
The AD1837AAS implements dual sigma-delta ADCs with decimation filters (120 dB stop-band attenuation, 43.54 kHz pass band at 96 kHz fs) and eight independent multibit sigma-delta DACs with interpolation filters (55 dB stop-band attenuation, 43.54 kHz pass band at 96 kHz fs). Each DAC features data-directed scrambling for jitter insensitivity and perfect differential linearity restoration to suppress idle tones.
It supports flexible serial interface modes - I²S, left/right-justified, DSP, and TDM - with master/slave configurability on both ADC and DAC ports, plus an SPI-compatible 4-wire control port for register programming and peak-level readback. The device uses separate 5 V analog (AVDD) and digital (DVDD/ODVDD) supplies and integrates a 2.25 V internal reference routed to FILTR.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ADC Resolution | 24-bit - Enables high-fidelity capture of dynamic audio signals with >105 dB dynamic range. |
| DAC Resolution | 24-bit - Supports professional-grade playback with 108 dB SNR and <0.025 dB interchannel gain mismatch. |
| Max Sample Rate | 96 kHz (ADC & all DACs); 192 kHz (DAC1 only) - Allows high-resolution audio processing and stereo replication across DAC banks. |
| THD+N (ADC) | –95 dB @ 48/96 kHz - Ensures minimal distortion in recording paths, critical for studio-grade input stages. |
| THD+N (DAC) | –92 dB @ 48/96 kHz - Delivers clean output for premium speaker drivers without post-filtering artifacts. |
| Volume Control | 1024-step linear scale (0.098% step size, 60 dB range) - Enables precise channel balancing and fade control in AV receivers. |
| Package | 52-lead MQFP (S-52-1) - Industrial-grade surface-mount footprint compatible with automated assembly and thermal management up to +85°C. |
Pinout & Package
AD1837AAS is housed in a 52-lead MQFP (S-52-1) package with exposed thermal pad (not electrically connected), specified for –40°C to +85°C operation. Pin 1 is located at top-left corner (see top-view diagram); AGND/DGND pins are distributed for analog/digital ground separation; NC pins (6, 8, 12, 25, 31) must remain unconnected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUTL1–OUTL4 | DAC Left Channel Analog Output | Single-ended voltage outputs referenced to 2.25 V common-mode; each drives 47 kΩ load with ±1.4 V swing at 0 dBFS. |
| OUTR1–OUTR4 | DAC Right Channel Analog Output | Independent per-channel outputs enable discrete amplification paths in 7.1 surround systems. |
| ADCLP/ADCLN, ADCRP/ADCRN | Differential ADC Input Pairs | Full-scale input range ±2.828 V; 4 kΩ input impedance and 15 pF capacitance require matched PCB routing. |
| DLRCLK/DBCLK, ALRCLK/ABCLK | LR and Bit Clock I/O | Configurable as master (output) or slave (input) via M/S pin; timing tolerances ≤15 ns setup/hold in TDM256 mode. |
| MCLK | Master Clock Input | Accepts 12.288 MHz (256×48 kHz) or 24.576 MHz (256×96 kHz); IMCLK internal clock must not exceed 24.576 MHz. |
| CIN/CCLK/CLATCH/COUT | SPI-Compatible Control Port | 16-bit command interface operating up to 12.5 MHz; supports register write/read during active audio streaming. |
| FILTD/FILTR | Filter Capacitor Terminals | FILTD connects to 10 µF/100 nF capacitor to reduce DAC bias noise; FILTR bypasses internal 2.25 V reference. |
Key Features
| Feature | Design Value |
|---|---|
| Data-directed scrambling DACs | Reduces sensitivity to master clock jitter - enables use with cost-effective oscillators while maintaining <–92 dB THD+N. |
| Clickless mute & software volume control | Eliminates pop/click artifacts during channel muting or level transitions in consumer AV equipment. |
| TDM256 interface mode | Supports 8-in/8-out audio over single SHARC SPORT - reduces interconnect count and PCB layer count in DSP-based systems. |
| Dual supply architecture (AVDD/DVDD/ODVDD) | Enables 3.3 V digital interface compatibility while maintaining 5 V analog performance - simplifies mixed-voltage board design. |
| On-chip 2.25 V reference (FILTR) | Provides stable bias for external op-amps and eliminates need for discrete reference IC in analog front-end circuits. |
Applications
| DVD/Blu-ray Audio Processing | Home Theater Receiver I/O Hub |
|---|---|
Use Scenario: Digital audio decoding and analog output conversion in multichannel disc players with HDMI/SPDIF inputs and 5.1/7.1 analog outputs. IC Role / Device Role / Timing Role: ADC captures optical SPDIF return path; DACs drive discrete preamp channels with synchronized LRCLK framing. Use Value: 108 dB DAC SNR ensures low-noise playback; TDM256 mode allows single-DSP control of all 8 DACs without multiplexing overhead. |
Use Scenario: Central audio codec in A/V receivers handling multiple source inputs (cable box, game console, streaming stick) and driving multi-zone amplifiers. IC Role / Device Role / Timing Role: ADC digitizes analog aux inputs; four stereo DAC banks feed independent zone amplifiers with isolated volume control per channel. Use Value: 1024-step volume control enables precise loudness matching across zones; 192 kHz DAC1 supports high-res streaming sources. |
| Automotive Infotainment Head Unit | Digital Audio Effects Processor |
Use Scenario: Audio signal path in vehicle head units supporting Bluetooth audio, USB playback, and analog radio tuner inputs. IC Role / Device Role / Timing Role: ADC digitizes FM/AM tuner output; DACs feed amplifier stages with de-emphasis applied for legacy media compatibility. Use Value: On-chip digital de-emphasis processing eliminates need for external filter networks; industrial temp range (–40°C to +85°C) ensures reliability under hood conditions. |
Use Scenario: Real-time effects engine in studio hardware (reverb, delay, EQ) requiring low-latency analog I/O and simultaneous multi-channel processing. IC Role / Device Role / Timing Role: ADC captures live instrument/mic signals; DACs output processed stereo pairs with independent gain staging per effect chain. Use Value: Perfect differential linearity restoration minimizes harmonic distortion during heavy DSP processing; 24-bit resolution preserves subtle transients. |
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 ADC + 8-channel DAC, 192 kHz max, but no TDM256 mode; uses 3.3 V core supply. | Lacks integrated 2.25 V reference and FILTR/FILTD filtering; requires external reference and more external passive components. | Preferred when lower power (120 mW vs. 740 mW) and smaller QFN package are prioritized over industrial temperature range and analog integration. |
| CS4385-CQZ | Octal DAC only (no ADC); 192 kHz, 123 dB SNR, but lacks ADC, SPI control, and volume control per channel. | Requires companion ADC (e.g., CS5381) and external microcontroller for register control - increases BOM and layout complexity. | Selected when ultimate DAC performance (123 dB SNR) is required and system already includes discrete ADC/control logic. |
Compared with AK4118VN and CS4385-CQZ, the AD1837AAS provides full analog I/O integration, on-chip reference, and TDM256 capability in a single MQFP package - reducing component count and enabling compact, self-contained multichannel audio subsystems without external timing or bias circuitry.
Availability
AD1837AAS is available at Aetrix Electronics and suitable for DVD/Blu-ray players, home theater receivers, and automotive infotainment systems requiring stable component supply, long-lifecycle support, and guaranteed industrial temperature operation.
Supply support for AD1837AAS 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.
The AD1837AAS belongs to Analog Devices' high-fidelity audio codec product line, designed specifically for multichannel consumer and professional audio systems demanding low THD+N, wide dynamic range, and flexible digital interface options.
FAQ
What is the maximum supported sample rate for ADC and DAC functions in the AD1837AAS?
The AD1837AAS supports up to 96 kHz for both ADC and all DAC channels. DAC1 alone can operate at 192 kHz when configured with 2× interpolation and appropriate MCLK (24.576 MHz). This is confirmed in the Functional Overview section and Table II of the datasheet, where 192 kHz is explicitly enabled only for DAC1 via DAC Control 1 Register bit settings.
Does the AD1837AAS include an integrated voltage reference, and how is it used?
Yes, the AD1837AAS includes an integrated 2.25 V voltage reference accessible at the FILTR pin. It serves as the common-mode bias for all analog inputs and outputs and may be used to bias external op-amps. The datasheet specifies a parallel 10 µF/100 nF capacitor must be placed directly at FILTR to stabilize the reference and minimize noise coupling into the analog signal path.
Can the AD1837AAS operate with a 3.3 V digital interface while using 5 V analog supplies?
Yes, the AD1837AAS supports mixed-supply operation: AVDD and DVDD are 5 V, while ODVDD (digital I/O driver supply) accepts 3.0 V to DVDD. This allows direct interfacing with 3.3 V DSPs, FPGAs, or microcontrollers without level shifters - a key feature highlighted in the FEATURES section and confirmed in the POWER SUPPLIES table.
What serial interface modes does the AD1837AAS support for DAC and ADC data transfer?
The AD1837AAS supports I²S, left-justified, right-justified, and DSP serial formats for both DAC and ADC ports. Additionally, it offers TDM256 and TDM512 modes for 8-in/8-out operation, and packed modes for consolidated data transfer. These are configurable via DAC/ADC Control Registers and verified in Figures 4–7 and the Serial Data Ports section.
Is the AD1837AAS pin-compatible with earlier AD1837 variants such as AD1837AASZ?
Yes, AD1837AAS and AD1837AASZ share identical pinout, package (52-lead MQFP), electrical specifications, and functional behavior - differing only in RoHS compliance (Z suffix = lead-free). The Ordering Guide confirms both use package option S-52-1 and operate over the same –40°C to +85°C range, making them drop-in replacements.
AD1837AAS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 52-QFP
- Packaging:
- Bag
- Product Status:
- Obsolete
- Type:
- General Purpose
- 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)
AD1837AAS FAQ
1.How can I place an order for AD1837AAS through Aetrix?
Please submit a Request for Quotation (RFQ) for AD1837AAS 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 AD1837AAS reliable?
The price and inventory of AD1837AAS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD1837AAS is usually 5 days.
3.What payment methods are accepted for AD1837AAS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD1837AAS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD1837AAS?
AD1837AAS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD1837AAS 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 AD1837AAS?
For technical support, including AD1837AAS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD1837AAS requirements.
6.How does Aetrix verify that AD1837AAS is sourced from the original manufacturer or authorized distributors?
All AD1837AAS 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 AD1837AAS meets industry standards.
7.What is the process for return or replacement of AD1837AAS?
All AD1837AAS units undergo pre-shipment inspection (PSI). If there is an issue with AD1837AAS, 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 AD1837AAS part is unused and in its original packaging.
Return procedure for AD1837AAS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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