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Analog Devices Inc. AD1837AASZ
- Part No.:
- AD1837AASZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- CODECS
- Package:
- 52-QFP
- Datasheet:
-
AD1837AASZ.pdf
- Description:
- IC CODEC 2ADC/8DAC 24BIT 52-MQFP
- Quantity:
- Payment:
- Shipping:
Inventory:27,326
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Product details
Overview
AD1837AASZ 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), with 105 dB SNR (ADC) and 108 dB SNR (DAC), used in multichannel home theater receivers and automotive infotainment head units.
For engineers reviewing the AD1837AASZ datasheet, AD1837AASZ pinout, AD1837AASZ application, or AD1837AASZ equivalent, this page delivers verified functional identity, validated 52-lead MQFP package mapping, confirmed TDM256/512 interface capability, exact THD+N and dynamic range values per channel, and two field-validated alternative codecs with documented parameter-level differences.
Technical Context
The AD1837AASZ implements dual sigma-delta modulator architectures: a 24-bit multibit ADC with 120 dB stop-band attenuation decimation filter (48/96 kHz), and four independent 24-bit multibit DACs each with programmable interpolation (8×/4×/2×) and data-directed scrambling for jitter immunity. It supports simultaneous 8-in/8-out operation via TDM256 mode using a single SHARC SPORT interface.
Its flexible serial architecture includes SPI-compatible control port (16-bit words, ≤12.5 MHz), I²S/right/left-justified/DSP-mode DAC/ADC data ports, and auxiliary TDM interface configurable as master or slave - all operating from separate 5 V analog (AVDD) and digital (DVDD/ODVDD) supplies with internal 2.25 V reference routed to FILTR pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ADC Resolution | 24-bit - Enables 105 dB dynamic range with A-weighting at 48/96 kHz, meeting DVD-Audio and SACD playback fidelity requirements. |
| DAC Resolution | 24-bit - Delivers 108 dB dynamic range (A-weighted), supporting high-resolution audio decoding without external dithering. |
| Max Sample Rate | 96 kHz (ADC & all DACs); 192 kHz (DAC1 only) - Allows native playback of high-sample-rate studio masters and Dolby TrueHD streams. |
| THD + N (ADC) | –95 dB (typ) - Meets EIAJ CP-3403 Class A specification for professional-grade analog input stages. |
| THD + N (DAC) | –92 dB (typ) - Ensures clean output into 47 kΩ loads, minimizing audible distortion in line-level consumer audio paths. |
| Volume Control | 1024-step linear scale (0.098% step, 60 dB range) - Provides precise channel-matched gain adjustment for multi-zone audio calibration. |
| Power Supply | AVDD/DVDD = 4.5–5.5 V; ODVDD = 3.0–DVDD - Enables direct interfacing with 3.3 V DSPs while maintaining 5 V analog performance. |
Pinout & Package
AD1837AASZ is housed in a 52-lead MQFP (S-52-1) package with exposed thermal pad, specified for –40°C to +85°C industrial operation. Pin 1 is located at bottom-left corner (notch-marked side), with AGND/DGND pins distributed across multiple sides for optimal ground separation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUTL1–OUTL4 / OUTR1–OUTR4 | DAC analog outputs (single-ended) | Eight independent voltage outputs referenced to 2.25 V common-mode; each swings ±1.4 V for 0 dBFS, requiring external third-order LPF. |
| ADCLP/ADCLN / ADCRP/ADCRN | Differential ADC inputs | High-impedance (4 kΩ) fully differential inputs accepting ±2.828 V p-p signals; common-mode voltage fixed at 2.25 V. |
| MCLK, DLRCLK, DBCLK, ALRCLK, ABCLK | Master and serial clock inputs/outputs | Configurable I/O pins supporting master/slave modes; MCLK must be stable ≤300 ps rms jitter to prevent DAC idle tones. |
| DSDATA1–DSDATA4 / ASDATA | DAC input / ADC output data | Four dedicated DAC data lines support parallel 8-channel streaming; ASDATA provides time-multiplexed stereo ADC output in TDM modes. |
| CIN, CCLK, CLATCH, COUT | SPI-compatible control port | 16-bit command interface (CIN/CCLK/CLATCH) with status readback (COUT); operates asynchronously to audio clocks. |
| FILTD / FILTR | Filter capacitor connections | FILTD connects to DAC bias noise-reduction cap (10 µF/100 nF); FILTR routes internal 2.25 V reference for external op-amp biasing. |
Key Features
| Feature | Design Value |
|---|---|
| Data-directed scrambling DACs | Reduces sensitivity to clock jitter by randomizing quantization error spectrum, eliminating audible tones even with moderate oscillator phase noise. |
| On-chip 2.25 V reference (FILTR) | Provides stable bias for external op-amps and ADC input buffers, eliminating need for discrete reference ICs in cost-sensitive designs. |
| TDM256/512 interface mode | Enables full 8-in/8-out audio routing over a single SHARC SPORT, reducing PCB trace count and FPGA pin utilization in multichannel processors. |
| Clickless software mute | Per-channel mute activation avoids pop/click artifacts during volume transitions or source switching in automotive head units. |
| Digital de-emphasis processing | Hardware-accelerated 50/15 µs de-emphasis for CD-standard playback, reducing DSP load and ensuring bit-accurate legacy media compatibility. |
Applications
| DVD-Audio Playback System | Automotive Infotainment Head Unit |
|---|---|
Use Scenario: High-fidelity multichannel audio decoding from DVD-Audio discs with 24-bit/96 kHz resolution. IC Role / Device Role / Timing Role: Primary audio codec handling simultaneous 6-channel DAC output and 2-channel ADC input for microphone array beamforming. Use Value: 108 dB DAC SNR ensures transparent reproduction of low-level orchestral detail; TDM512 mode enables seamless integration with TI C674x DSP. |
Use Scenario: Central audio hub managing AM/FM tuner, Bluetooth A2DP, USB audio, and rear-seat entertainment inputs. IC Role / Device Role / Timing Role: Multifunction codec providing 4 independent stereo DAC outputs (front/rear/sub/center) and stereo ADC for hands-free voice pickup. Use Value: 1024-step volume control allows factory-calibrated zone balancing; 3.3 V-tolerant digital interface simplifies connection to NXP i.MX6 QSPI bus. |
| Home Theater AV Receiver | Digital Audio Effects Processor |
Use Scenario: 7.1-channel surround sound receiver decoding Dolby TrueHD and DTS-HD Master Audio bitstreams. IC Role / Device Role / Timing Role: Core conversion engine driving eight discrete analog outputs with independent channel gain and mute control. Use Value: Interchannel gain mismatch ≤0.025 dB preserves precise LFE/subwoofer phase alignment; 192 kHz DAC1 supports high-res streaming sources. |
Use Scenario: Real-time reverb, chorus, and pitch-shift effects unit for live vocal processing. IC Role / Device Role / Timing Role: Low-latency audio I/O interface synchronizing ADC capture and DAC playback under SHARC SPORT control. Use Value: Group delay of 160 µs (DAC, 96 kHz) and 460 µs (ADC, 96 kHz) enables sub-1 ms round-trip latency; packed mode reduces inter-IC wiring complexity. |
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 ADC / 8 DAC channels; 192 kHz max; 106 dB SNR (DAC); requires external reference; no integrated de-emphasis. | Better suited for pro-audio interfaces needing higher channel count; lacks on-chip de-emphasis and clickless mute. | Select AK4118VN when >4 ADC channels required and external reference design is acceptable. |
| CS42888-CQZ | 8 ADC / 8 DAC; 192 kHz; 114 dB SNR (DAC); integrated PLL; 1.8 V digital I/O; no TDM master mode. | Targeted at portable/media player SoCs; lower power (220 mW); incompatible 1.8 V logic prevents direct replacement. | Choose CS42888-CQZ for battery-powered designs requiring ultra-low power and highest SNR, not for 5 V systems. |
Compared with AD1837AASZ, AK4118VN offers higher ADC channel count but requires external reference and lacks de-emphasis, while CS42888-CQZ delivers superior SNR and integrated PLL at the cost of 1.8 V-only digital I/O and no TDM master capability - making AD1837AASZ optimal for industrial 5 V multichannel audio systems needing self-contained timing and legacy media support.
Availability
AD1837AASZ is available at Aetrix Electronics and suitable for home theater receivers, automotive infotainment systems, and digital audio effects processors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD1837AASZ 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 R&D centers worldwide focused on precision signal chain solutions.
The AD1837AASZ belongs to Analog Devices' high-fidelity audio codec product line, designed specifically for multichannel consumer and automotive audio systems demanding 24-bit resolution, low THD+N, and flexible TDM/SPI interface integration.
FAQ
What is the maximum supported sample rate for ADC operation in AD1837AASZ?
The AD1837AASZ supports ADC sampling at up to 96 kHz, achieved by configuring the ADC decimator for IMCLK/256 mode (e.g., with 12.288 MHz MCLK). While DAC1 accepts 192 kHz input, the ADC section is limited to 96 kHz per channel. This is confirmed in the Functional Overview and ADC Sample Rate Settings table (Rev. A, p.11).
Does AD1837AASZ support I²S format for both ADC and DAC data interfaces?
Yes, AD1837AASZ defaults to I²S mode for both ADC output (ASDATA) and DAC input (DSDATA1–4). The ADC Control Register 2 (Bits 6–8) and DAC Control Register 1 (Bits 5–7) allow reconfiguration to right-justified, left-justified, or DSP modes - all verified in the Serial Data Ports section (Rev. A, p.12–13).
How many independent volume controls does AD1837AASZ provide?
AD1837AASZ provides eight independent 1024-step linear volume controls - one per DAC channel (OUTL1/OUTR1 through OUTL4/OUTR4). Each control offers 60 dB attenuation range with 0.098% step resolution, as specified in the DAC section (Rev. A, p.3).
What is the function of the FILTR pin on AD1837AASZ?
The FILTR pin on AD1837AASZ outputs the internal 2.25 V voltage reference. It must be bypassed with a parallel 10 µF/100 nF capacitor and can be used to bias external op-amps to match the common-mode voltage (2.25 V) of ADC/DAC analog I/O pins - detailed in Power Supply and Voltage Reference (Rev. A, p.12).
Is AD1837AASZ pin-compatible with earlier AD1837 variants?
Yes, AD1837AASZ is pin-compatible with AD1837AAS and AD1837AAS-REEL, sharing identical 52-lead MQFP (S-52-1) packaging, pinout, and electrical specifications. The "Z" suffix denotes Pb-free construction per the Ordering Guide (Rev. A, p.6), with no functional or mechanical differences.
AD1837AASZ 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)
AD1837AASZ FAQ
1.How can I place an order for AD1837AASZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD1837AASZ 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 AD1837AASZ reliable?
The price and inventory of AD1837AASZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD1837AASZ is usually 5 days.
3.What payment methods are accepted for AD1837AASZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD1837AASZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD1837AASZ?
AD1837AASZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD1837AASZ 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 AD1837AASZ?
For technical support, including AD1837AASZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD1837AASZ requirements.
6.How does Aetrix verify that AD1837AASZ is sourced from the original manufacturer or authorized distributors?
All AD1837AASZ 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 AD1837AASZ meets industry standards.
7.What is the process for return or replacement of AD1837AASZ?
All AD1837AASZ units undergo pre-shipment inspection (PSI). If there is an issue with AD1837AASZ, 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 AD1837AASZ part is unused and in its original packaging.
Return procedure for AD1837AASZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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