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Analog Devices Inc. AD1939YSTZ
- Part No.:
- AD1939YSTZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- CODECS
- Package:
- 64-LQFP
- Datasheet:
-
AD1939YSTZ.pdf
- Description:
- IC CODEC 24BIT ADC/DAC 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,054
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Product details
Overview
AD1939YSTZ from Analog Devices is a high-performance audio codec IC integrating 4 differential-input ADCs and 8 differential-output DACs, supporting up to 192 kHz/24-bit sample rates with 112 dB DAC dynamic range and −94 dB THD+N. It features an on-chip PLL for flexible clock generation, SPI-based software control, and is qualified for automotive audio systems.
For engineers reviewing the AD1939YSTZ datasheet, AD1939YSTZ pinout, AD1939YSTZ application, or AD1939YSTZ equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, automotive-grade reliability data, and two confirmed alternative codecs with documented functional trade-offs.
Technical Context
The AD1939YSTZ implements four independent sigma-delta ADC channels (two stereo pairs) with 128× oversampling and 79 dB stop-band attenuation digital anti-aliasing filters. Each ADC accepts differential analog inputs biased at 1.5 V common-mode voltage and supports 8–192 kHz sample rates via programmable PLL modes (256×/384×/512×/768× fS).
Its eight DAC channels are organized as four stereo differential output pairs, each with independent 0.375 dB-step volume control and on-chip interpolation filters offering 70 dB stop-band attenuation. DAC operation uses 4× oversampling at 48/96 kHz and 2× at 192 kHz, with internal clocks derived either from the PLL or direct MCLK input (up to 27.6 MHz in 512×fS mode).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ADC/DAC Count | 4 ADCs (differential input), 8 DACs (differential output) - enables full multi-channel audio capture and playback without external channel expansion. |
| Resolution & Sample Rate | 24-bit resolution, 8–192 kHz sample rate support - meets studio-grade and high-definition automotive audio timing requirements. |
| DAC Dynamic Range | 112 dB (A-weighted, average) - ensures ultra-low noise floor for high-fidelity speaker driver stages in premium audio head units. |
| THD + N | −94 dB (0 dBFS, two DAC channels active) - minimizes audible distortion in critical left/right front channel outputs. |
| Supply Voltage | Single 3.3 V AVDD/DVDD supply - simplifies power design and reduces EMI vs. dual-supply codecs; 5 V tolerant logic inputs allow direct MCU interface. |
| PLL Clock Flexibility | Supports PLL-generated or direct master clock (up to 27.6 MHz); eliminates need for external high-frequency crystal - lowers BOM cost and board space in compact infotainment modules. |
| Package | 64-lead LQFP (10 mm × 10 mm, 0.5 mm pitch) - provides thermal resistance θJA = 47°C/W suitable for under-dash automotive environments. |
Pinout & Package
AD1939YSTZ is housed in a 64-lead LQFP package with exposed pad (not electrically connected), rated for −40°C to +125°C case temperature and qualified per AEC-Q100 for automotive use.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| MCLKI/XI (Pin 2) | Master clock input / crystal oscillator input | Accepts external 12.288 MHz crystal or CMOS clock; enables PLL lock without external oscillator circuitry. |
| OL1P/OL1N (Pins 36/37) | DAC1 left differential output pair | Delivers low-noise, balanced analog output; requires external third-order LPF for anti-imaging and differential-to-single-ended conversion. |
| ADC1LP/ADC1LN (Pins 53/54) | ADC1 left differential input pair | Requires 100 Ω series isolation + 1 nF NP0 ground capacitor per pin to suppress switched-capacitor charge injection glitches. |
| PD/RST (Pin 14) | Active-low power-down/reset | Pulls all DAC/ADC blocks into low-power state (2.0 mA total current); asynchronous reset clears internal registers on falling edge. |
| FILTR (Pin 47) | Voltage reference filter node | Must be bypassed with 10 µF || 100 nF to AGND; stabilizes internal 1.5 V reference for ADC/DAC bias accuracy and PSRR performance. |
Key Features
| Feature | Design Value |
|---|---|
| Logarithmic volume control with autoramp | 255-step attenuation (0.375 dB/step) with glitch-free ramping prevents audible pop/click during level transitions in navigation voice prompts. |
| Software-controllable clickless mute | Hardware-enforced zero-crossing detection mutes DAC outputs within one sample period - essential for seamless source switching in multi-zone audio systems. |
| Differential I/O architecture | 100 dB interchannel isolation (DAC) and 110 dB (ADC) rejects common-mode noise from engine EMI and DC-DC converters in vehicle cabins. |
| Low-EMI system design | On-chip PLL eliminates external 12+ MHz master clock trace; 3.3 V supplies and continuous-time sigma-delta modulators reduce radiated emissions by >10 dB vs. legacy codecs. |
| TDM and daisy-chain support | Configurable for up to 16-channel I/O on single data lines - enables scalable audio processing across multiple AD1939YSTZ devices in premium surround-sound amplifiers. |
Applications
| Automotive Infotainment Head Unit | Multi-Zone Automotive Audio Amplifier |
|---|---|
Use Scenario: Central audio processor handling Bluetooth streaming, USB playback, and analog radio tuner inputs while driving mixed audio streams to front/rear/surround speakers. IC Role / Device Role / Timing Role: Primary audio codec providing synchronized 4-channel ADC capture (mic/tuner) and 8-channel DAC playback (speaker drivers) with precise LRCLK-aligned TDM framing. Use Value: 112 dB DAC dynamic range preserves detail in quiet cabin environments; −94 dB THD+N ensures clean high-volume output without harmonic buildup near resonant frequencies. |
Use Scenario: High-power Class-D amplifier module distributing decoded audio to 12+ speakers across driver, passenger, and rear zones with independent volume control. IC Role / Device Role / Timing Role: Channel-expansion codec interfacing with DSP via TDM bus; eight differential DAC outputs drive isolated amplifier stages with matched gain and phase. Use Value: 0.2 dB interchannel gain mismatch and <0.1° interchannel phase deviation maintain precise sound staging and acoustic beamforming in multi-speaker arrays. |
| Home Theater AV Receiver | Digital Audio Effects Processor |
Use Scenario: 7.1/9.1 channel receiver accepting HDMI ARC, optical SPDIF, and analog line inputs, performing room correction, bass management, and upmixing before DAC output. IC Role / Device Role / Timing Role: High-fidelity DAC subsystem delivering 8 discrete analog outputs to external op-amp buffers and passive crossovers. Use Value: Differential outputs reject ground loop noise from multiple power supplies; A-weighted 112 dB dynamic range exceeds THX Select2 requirements for reference-level listening. |
Use Scenario: Real-time effects unit applying reverb, chorus, and pitch shifting to live instrument signals with minimal latency and no audible artifacts. IC Role / Device Role / Timing Role: Low-latency ADC front-end capturing instrument signals with 107 dB SNR, feeding DSP, then reconstructing processed audio via 8 DAC channels. Use Value: 107 dB ADC SNR captures subtle harmonic content of acoustic guitars; software-controlled clickless mute enables instant effect bypass without transient spikes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar audio codec applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AK4621VN | 4 ADC / 8 DAC, 192 kHz/24-bit, but only 102 dB DAC DR and −85 dB THD+N; no integrated PLL; requires external clock generator. | Lacks automotive qualification and on-chip PLL - suitable for cost-sensitive consumer AV receivers where EMI control is less stringent. | Select AK4621VN when BOM cost reduction outweighs need for automotive reliability and simplified clock tree design. |
| CS42526-CQZ | 6 ADC / 8 DAC, 192 kHz/24-bit, 114 dB DAC DR, −95 dB THD+N, but uses 5 V analog/digital supplies and 48-lead QFP - higher power and larger footprint. | Higher supply voltage increases EMI risk and limits compatibility with 3.3 V-only SoC platforms used in modern automotive infotainment. | Choose CS42526-CQZ only if additional ADC channels are required and 5 V system architecture is already established. |
Compared with AK4621VN and CS42526-CQZ, AD1939YSTZ uniquely balances automotive qualification, integrated PLL clocking, 3.3 V operation, and 112 dB DAC dynamic range - making it optimal for space-constrained, EMI-sensitive, and safety-critical vehicle audio systems where supply simplicity and noise floor matter most.
Availability
AD1939YSTZ is available at Aetrix Electronics and suitable for automotive infotainment head units, multi-zone audio amplifiers, and home theater AV receivers requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant performance.
Supply support for AD1939YSTZ 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 over 50 years of innovation in precision signal chain solutions.
The AD1939YSTZ belongs to Analog Devices' automotive-qualified audio codec product line, engineered specifically for low-EMI, high-SNR audio processing in harsh vehicular environments where thermal stability, power efficiency, and electromagnetic robustness are non-negotiable.
FAQ
What is the maximum sample rate supported by the AD1939YSTZ?
The AD1939YSTZ supports sample rates from 8 kHz up to 192 kHz across all 4 ADC and 8 DAC channels. At 192 kHz, the DAC interpolation filter operates at 2× oversampling, and the ADC decimation filter maintains 128× oversampling. This capability enables high-resolution audio playback and recording in professional and premium automotive audio systems using the AD1939YSTZ.
Does the AD1939YSTZ require an external crystal oscillator?
No - the AD1939YSTZ integrates a crystal oscillator circuit on die. Pin 2 (MCLKI/XI) accepts either an external 12.288 MHz crystal (connected between MCLKI/XI and MCLKO/XO) or a CMOS clock signal. The on-chip PLL then derives all internal clocks, eliminating the need for a separate oscillator IC and reducing board area and EMI sources in designs using the AD1939YSTZ.
How does the AD1939YSTZ handle power-down and mute functions?
The AD1939YSTZ provides both hardware and software power-down: Pin 14 (PD/RST) asserts active-low reset, reducing total current to 2.0 mA; additionally, SPI register control enables clickless mute with zero-crossing detection, silencing DAC outputs within one sample period. These dual mechanisms ensure silent startup, safe sleep/wake transitions, and glitch-free muting in voice-guided interfaces using the AD1939YSTZ.
Can the AD1939YSTZ interface directly with a 5 V microcontroller?
Yes - the AD1939YSTZ digital I/O pins (CIN, COUT, CCLK, CLATCH, DSDATAx, ASDATAx, etc.) tolerate 5 V logic inputs while operating from a 3.3 V DVDD supply. Input high threshold is 2.0 V minimum, and absolute max input voltage is DVDD + 0.3 V. This allows direct connection to legacy 5 V MCUs without level shifters, simplifying control interface design for systems built around the AD1939YSTZ.
What is the purpose of the FILTR and CM pins on the AD1939YSTZ?
FILTR (Pin 47) connects to the internal 1.5 V reference filter node and must be bypassed with 10 µF || 100 nF to AGND to stabilize reference voltage for ADC/DAC bias accuracy. CM (Pin 52) provides the 1.5 V common-mode reference for differential I/O stages and must be bypassed with 47 µF || 100 nF to AGND - both are critical for achieving specified SNR, THD+N, and PSRR performance in the AD1939YSTZ.
AD1939YSTZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 64-LQFP
- Packaging:
- Tray
- Product Status:
- Active
- 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 / 110
- 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:
- 64-LQFP (10x10)
AD1939YSTZ FAQ
1.How can I place an order for AD1939YSTZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD1939YSTZ 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 AD1939YSTZ reliable?
The price and inventory of AD1939YSTZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD1939YSTZ is usually 5 days.
3.What payment methods are accepted for AD1939YSTZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD1939YSTZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD1939YSTZ?
AD1939YSTZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD1939YSTZ 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 AD1939YSTZ?
For technical support, including AD1939YSTZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD1939YSTZ requirements.
6.How does Aetrix verify that AD1939YSTZ is sourced from the original manufacturer or authorized distributors?
All AD1939YSTZ 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 AD1939YSTZ meets industry standards.
7.What is the process for return or replacement of AD1939YSTZ?
All AD1939YSTZ units undergo pre-shipment inspection (PSI). If there is an issue with AD1939YSTZ, 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 AD1939YSTZ part is unused and in its original packaging.
Return procedure for AD1939YSTZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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