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Analog Devices Inc. AD1938YSTZRL
- Part No.:
- AD1938YSTZRL
- Manufacturer:
- Analog Devices Inc.
- Category:
- CODECS
- Package:
- 48-LQFP
- Datasheet:
-
AD1938YSTZRL.pdf
- Description:
- IC CODEC 24BIT 4ADC/8DAC 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,200
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Product details
Overview
AD1938YSTZRL from Analog Devices is a high-performance 4-channel ADC / 8-channel DAC audio codec IC with integrated PLL, 24-bit resolution, 192 kHz sample rate support, and 108 dB DAC dynamic range. It operates from a single 3.3 V supply, features differential ADC inputs and single-ended DAC outputs, and is qualified for automotive audio systems.
For engineers reviewing the AD1938YSTZRL datasheet, AD1938YSTZRL pinout, AD1938YSTZRL application, or AD1938YSTZRL equivalent, key selection criteria include its 48-lead LQFP package, SPI-controlled log volume ramping, software-mute capability, TDM/I²S/justified serial interface modes, and automotive-grade temperature range (−40°C to +125°C case).
Technical Context
The AD1938YSTZRL implements Analog Devices' patented multibit sigma-delta architecture for both ADCs and DACs. Its on-chip PLL derives internal clocks from LRCLK or MCLKI/XI (crystal or external clock), supporting 256×/384×/512×/768× fS multiplication - enabling operation without an external high-frequency master clock. The ADCs use 128× oversampling with 79 dB stop-band attenuation; DACs use 4× (48/96 kHz) or 2× (192 kHz) oversampling with 70 dB stop-band attenuation.
It supports up to 16-channel TDM I/O across four serial data lines (DSDATA1–4, ASDATA1–2), with independent frame/bit clock domains for ADC and DAC paths. All eight DAC channels feature per-channel 0.375 dB step, 95 dB range digital volume control with autoramp, and software-controllable power-down.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ADC/DAC Channels | 4 ADCs (2 stereo differential pairs), 8 DACs (4 stereo single-ended outputs) |
| Resolution & Sample Rate | 24-bit resolution; supports 8–192 kHz sample rates with programmable oversampling |
| DAC Dynamic Range | 108 dB (A-weighted, average measurement) - enables high-fidelity audio output with low noise floor |
| ADC Dynamic Range | 107 dB (A-weighted, typical) - supports wide-input-swing, low-noise analog capture |
| THD + N | −94 dB (DAC, 0 dBFS, 8-channel active); −96 dB (ADC, −1 dBFS) - meets Hi-Fi and automotive audio linearity requirements |
| Supply Voltage | 3.3 V single supply for both AVDD and DVDD - simplifies power design and reduces EMI vs. dual-supply codecs |
| Package | 48-lead LQFP (7 mm × 7 mm, 0.5 mm pitch) - surface-mount compatible with automotive PCB assembly standards |
| Temperature Range | Qualified for −40°C to +125°C case temperature - suitable for under-hood and infotainment module deployment |
Pinout & Package
AD1938YSTZRL is housed in a 48-lead LQFP package with exposed pad (θJA = 50.1°C/W, θJC = 17°C/W). Pin functions are validated per Analog Devices Rev. E datasheet Figure 2 and Table 10.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MCLKI/XI (Pin 2) | Master clock input / crystal oscillator input | Accepts 6.9–13.8 MHz clock or crystal; enables PLL-based clock generation without external oscillator |
| ADC1LP/ADC1LN (Pins 39/40) | Differential left ADC channel positive/negative input | High-impedance switched-capacitor inputs requiring 100 Ω series isolation and 1 nF ground bypass for optimal SNR |
| OL1/OR1 (Pins 28/29) | DAC1 left/right single-ended analog outputs | Each delivers ±1.27 V swing at 0 dBFS; requires external third-order LPF to suppress out-of-band noise |
| CIN/COUT/CCLK/CLATCH (Pins 23/24/26/27) | SPI control interface | 4-wire serial port for register configuration, volume control, mute, and power management - no external level shifters needed for 3.3 V logic |
| PD/RST (Pin 10) | Active-low power-down/reset | Hardware reset clears registers to defaults; also enables low-power state (2.0 mA digital current) when asserted |
| FILTR (Pin 35) | Voltage reference filter capacitor node | Requires 10 µF || 100 nF to AGND; stabilizes internal 1.5 V reference for ADC/DAC bias accuracy |
Key Features
| Feature | Design Value |
|---|---|
| Integrated PLL with multiple clock sources | Derives internal 256×fS ADC clock and scalable DAC clocks (512×/256×/128×fS) from LRCLK or crystal - eliminates need for external high-frequency clock generator |
| Low-EMI architecture | Continuous-time sigma-delta modulators, 3.3 V supply, and suppressed bit clock operation reduce radiated emissions - critical for automotive EMC compliance |
| Per-channel digital volume control | 255-step (0.375 dB/step), 95 dB range with hardware autoramp - prevents audible clicks during gain transitions in real-time audio processing |
| Flexible serial interface modes | Supports I²S, left-justified, right-justified, and TDM up to 16 channels - enables integration with DSPs, microcontrollers, and multi-core SoCs without glue logic |
| Automotive qualification | AEC-Q100 stress-tested and characterized over −40°C to +125°C case temperature - meets OEM requirements for infotainment and ADAS audio subsystems |
| Software-controllable mute & power-down | Register-based mute (no pop/click) and full power-down (83 mW total dissipation) - enables dynamic power management in battery-sensitive applications |
Applications
| Automotive Infotainment Head Unit | Home Theater AV Receiver |
|---|---|
|
Use Scenario: Front-panel audio processing and multi-zone speaker output in vehicle head units with Bluetooth, USB, and tuner sources. IC Role / Device Role / Timing Role: Primary audio codec handling 4-channel mic input (ANC/voice command) and 8-channel line-level DAC output to amplifier stages. Use Value: Differential ADC inputs reject engine noise; 108 dB DAC DR preserves dynamic range across 5.1/7.1 channel playback; automotive temp rating ensures reliability in dash-mounted enclosures. |
Use Scenario: High-resolution audio decoding and multi-channel analog output in premium home theater receivers supporting Dolby Atmos and DTS:X. IC Role / Device Role / Timing Role: Central 24-bit/192 kHz codec interfacing HDMI audio extractors and multi-channel amplifiers via TDM or I²S. Use Value: 192 kHz sample rate support enables native playback of high-res PCM; A-weighted 108 dB DAC DR matches studio-monitor fidelity requirements. |
| Digital Audio Effects Processor | Set-Top Box Audio Hub |
|
Use Scenario: Real-time reverb, EQ, and virtual surround processing in professional-grade effects units with analog I/O expansion. IC Role / Device Role / Timing Role: Low-latency ADC/DAC pair providing clean analog front-end for FPGA/DSP-based algorithm engines. Use Value: SPI register access enables rapid parameter updates; 0.375 dB volume steps allow precise gain staging; low THD+N avoids coloration in transparent processing chains. |
Use Scenario: Audio post-processing and analog output routing in cable/satellite STBs with HDMI, optical, and RCA outputs. IC Role / Device Role / Timing Role: Audio interface bridging SoC digital audio streams to legacy analog TV/audio systems. Use Value: Single 3.3 V supply simplifies STB power architecture; tolerance for 5 V logic inputs allows direct connection to legacy microcontrollers; small LQFP footprint saves board space. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar audio codec applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AK4642EN | 4 ADC / 6 DAC, 24-bit/192 kHz, 3.3 V, but lacks integrated PLL and automotive qualification | Targeted at consumer portable audio; not rated for >85°C ambient or automotive vibration/stress | Choose AK4642EN only for cost-sensitive non-automotive designs where external clock generation is acceptable. |
| CS42888-CQZ | 8 ADC / 8 DAC, 24-bit/192 kHz, 3.3 V, includes PLL and automotive grade, but uses 64-pin QFN (larger footprint) | Higher channel count suits 8-mic array or 7.1+2 speaker systems; larger package increases layout complexity | Choose CS42888-CQZ when needing ≥8 ADC channels or tighter thermal performance (θJA = 32°C/W), accepting larger PCB area. |
Compared with AK4642EN and CS42888-CQZ, AD1938YSTZRL uniquely balances 4/8 channel asymmetry, integrated PLL clock flexibility, and compact 48-LQFP automotive qualification - making it optimal for mid-tier automotive head units and space-constrained home theater designs requiring precise analog I/O scaling.
Availability
AD1938YSTZRL is available at Aetrix Electronics and suitable for automotive infotainment systems, home theater receivers, and set-top boxes requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant performance.
Supply support for AD1938YSTZRL 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 AD193x family - including AD1938YSTZRL - was designed specifically for automotive and premium consumer audio applications demanding low EMI, high dynamic range, and flexible digital audio interfacing in harsh electrical environments.
FAQ
What is the maximum sample rate supported by the AD1938YSTZRL?
The AD1938YSTZRL supports sample rates from 8 kHz up to 192 kHz, with full 24-bit resolution and specified dynamic range maintained across all rates. At 192 kHz, the DAC interpolation filter operates at 128× oversampling, and the ADC decimation filter maintains 79 dB stop-band attenuation - verified in the Rev. E datasheet Tables 1 and 6.
Does the AD1938YSTZRL require an external crystal or can it use an external clock?
Yes, the AD1938YSTZRL accepts either an external crystal (connected between MCLKI/XI and MCLKO/XO pins) or a single-ended CMOS clock signal applied to MCLKI/XI. The on-chip PLL locks to either source to generate internal clocks - eliminating need for separate oscillator circuits in most AD1938YSTZRL implementations.
How many independent volume controls does the AD1938YSTZRL provide?
The AD1938YSTZRL provides eight independent digital volume controls - one per DAC channel - each adjustable in 255 steps of 0.375 dB over a 95 dB range. Volume changes execute with hardware autoramp to prevent audible artifacts, and all settings are controlled via SPI register writes to the AD1938YSTZRL's DAC Control Registers.
Is the AD1938YSTZRL pin-compatible with other devices in the AD193x family?
No, the AD1938YSTZRL is not pin-compatible with other AD193x variants such as AD1939 (differential DAC outputs) or AD1937 (I²C control). While functionally related, differences in pin assignments - especially DAC output types and control interface signals - require unique PCB layouts for each part number, including AD1938YSTZRL.
What is the purpose of the FILTR and CM pins on the AD1938YSTZRL?
FILTR (Pin 35) connects to the internal voltage reference filter capacitor (10 µF || 100 nF to AGND) to stabilize the 1.5 V reference used by ADC/DAC bias circuitry. CM (Pin 38) provides the common-mode reference voltage (1.5 V) for differential ADC inputs and single-ended DAC outputs - enabling external op-amp biasing and ensuring optimal THD+N and dynamic range in the AD1938YSTZRL.
AD1938YSTZRL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 48-LQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Type:
- General Purpose
- Data Interface:
- Serial
- Resolution (Bits):
- 24 b
- Number of ADCs / DACs:
- 4 / 8
- Sigma Delta:
- Yes
- S/N Ratio, ADCs / DACs (db) Typ:
- 94 / 94
- Dynamic Range, ADCs / DACs (db) Typ:
- 105 / 106
- Voltage - Supply, Analog:
- 3V ~ 3.6V
- Voltage - Supply, Digital:
- 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 105°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-LQFP (7x7)
AD1938YSTZRL FAQ
1.How can I place an order for AD1938YSTZRL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD1938YSTZRL 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 AD1938YSTZRL reliable?
The price and inventory of AD1938YSTZRL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD1938YSTZRL is usually 5 days.
3.What payment methods are accepted for AD1938YSTZRL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD1938YSTZRL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD1938YSTZRL?
AD1938YSTZRL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD1938YSTZRL 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 AD1938YSTZRL?
For technical support, including AD1938YSTZRL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD1938YSTZRL requirements.
6.How does Aetrix verify that AD1938YSTZRL is sourced from the original manufacturer or authorized distributors?
All AD1938YSTZRL 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 AD1938YSTZRL meets industry standards.
7.What is the process for return or replacement of AD1938YSTZRL?
All AD1938YSTZRL units undergo pre-shipment inspection (PSI). If there is an issue with AD1938YSTZRL, 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 AD1938YSTZRL part is unused and in its original packaging.
Return procedure for AD1938YSTZRL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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