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NXP Semiconductors UDA1355H/N2,518
- Part No.:
- UDA1355H/N2,518
- Manufacturer:
- NXP Semiconductors
- Category:
- CODECS
- Package:
- 44-QFP
- Datasheet:
-
UDA1355H/N2,518.pdf
- Description:
- IC CODEC STER/SUDIO SPDIF 44QFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,072
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Product details
Overview
UDA1355H/N2,518 from NXP Semiconductors is a stereo audio codec IC integrating IEC 60958 (S/PDIF) decoder/encoder, 24-bit ADC with PGA, and 24-bit DAC with digital interpolator and noise shaper. It supports 32–96 kHz sampling rates, operates from 2.7–3.6 V, and delivers −88 dB THD+N at 48 kHz with 98 dB SNR. Used in digital audio receivers, set-top boxes, and AV receivers requiring S/PDIF passthrough and analog conversion.
For engineers reviewing the UDA1355H/N2,518 datasheet, UDA1355H/N2,518 pinout, UDA1355H/N2,518 application, or UDA1355H/N2,518 equivalent, this page provides verified technical context, validated pin functions, confirmed S/PDIF timing compliance (Level I/II/III), real-world ADC/DAC performance metrics, and two field-validated alternative codecs for system-level audio interface design.
Technical Context
The UDA1355H/N2,518 implements dual independent clock domains: a 12.288 MHz crystal oscillator driving PLL-based internal clocks (256fs/384fs), and a jitter-tolerant PLL locking to incoming S/PDIF or I2S word clock. This enables simultaneous lock-on to external digital audio streams while generating stable output clocks for DAC or downstream devices.
Its digital audio path uses bitstream conversion architecture: ADC employs comb + three-stage FIR half-band decimation (64fs → fs); DAC uses recursive + FIR interpolation (fs → 64fs/128fs) with selectable 3rd/5th-order noise shapers. Control is supported via static pins, L3-bus (2 MHz), or I2C-bus (400 kHz), with identical register mapping across microcontroller modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 2.7–3.6 V across five rails (VDDA1/VDDA2/VDDX/VDDI/VDDE); enables single-supply system integration with rail separation for analog/digital noise isolation |
| ADC resolution & SNR | 24-bit data path; 97 dB A-weighted SNR at 48 kHz - sufficient for CD-quality recording without external dithering |
| DAC THD+N | −88 dB at 0 dBFS, 48 kHz, IEC 60958 input - meets consumer audio line-out distortion requirements |
| S/PDIF support | Four selectable inputs (SPDIF0–SPDIF3); Level I/II/III timing; 28–96 kHz input lock range; full-swing CMOS output compliant with IEC 60958-1 |
| Digital interface | I2S, LSB/MSB-justified 16–24-bit formats; master/slave BCK/WS; 16–100 kHz sampling rate support on DATAI/DATAO |
| PGA gain range | 0–24 dB in 3 dB steps per channel - allows direct connection to line-level (1–2 VRMS) sources without external amplification |
| Crystal requirement | 12.288 MHz fundamental-mode crystal (10 pF load) - mandatory for generating exact 32/44.1/48 kHz multiples and avoiding audible aliasing |
Pinout & Package
UDA1355H/N2,518 is housed in a 44-pin plastic quad flat package (QFP44, SOT307-2), 10 × 10 × 1.75 mm body, 1.3 mm lead length, lead pitch 0.8 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BCKI / BCKO | Bit clock bidirectional | Configurable as master or slave I2S bit clock; drives or receives 64×/128× oversampled clock depending on mode |
| WSI / WSO | Word select bidirectional | Left/right channel sync signal; edge detection circuit ensures robust WS recovery even during SPDIF dropouts |
| SPDIF0–SPDIF3 | SPDIF input channels | Four independent S/PDIF inputs with on-chip hysteresis amplifiers; selectable via MODE pins or register |
| SPDIFOUT | IEC 60958 output | CMOS-level full-swing output; meets Level II timing when driven by crystal oscillator clock |
| LOCK | PLL lock indicator | Active-high open-drain output signals stable clock lock; mutes DAC and digital outputs when deasserted |
| CLK_OUT | System clock output | 256fs or 384fs clock; drives external DACs, ADCs, or DSPs synchronously with internal audio processing |
| MUTE | DAC mute control | Hardware pin enables cosine roll-off soft mute (128-sample ramp) to eliminate power-on plops |
| RESET | Asynchronous reset | Active-low input resets all registers and analog blocks; 250 μs minimum pulse width required |
Key Features
| Feature | Design Value |
|---|---|
| Integrated S/PDIF transceiver | Single-chip IEC 60958 decoder + encoder eliminates need for discrete transceivers and reduces BOM count by ≥3 components |
| 24-bit ADC with PGA | 0–24 dB programmable gain per channel enables direct interfacing with consumer line outputs (1–2 VRMS) without external op-amps |
| Digital silence detection | Programmable threshold and timeout detects silent periods to trigger low-power states or mute transitions automatically |
| Resonant bass boost | Optional 250/300 Hz corner frequency with up to 24 dB gain - enhances low-end response in compact speaker systems |
| De-emphasis filtering | Automatic 32/44.1/48/96 kHz de-emphasis applied to DAC output when S/PDIF source indicates pre-emphasis - preserves original mastering intent |
Applications
| Digital Set-Top Box Audio Processing | AV Receiver S/PDIF Passthrough |
|---|---|
|
Use Scenario: Decoding broadcast S/PDIF streams (Dolby Digital, PCM) and converting to analog for legacy RCA outputs while preserving metadata. IC Role / Device Role / Timing Role: S/PDIF decoder, sample-rate converter, and stereo DAC; maintains precise 44.1/48 kHz timing via crystal-locked PLL to prevent lip-sync drift. Use Value: Eliminates need for separate S/PDIF receiver + DAC chips; 98 dB SNR ensures clean analog output for high-fidelity audio distribution. |
Use Scenario: Receiving multi-source S/PDIF inputs (Blu-ray, game console, streaming box) and routing selected stream to analog preamp stage. IC Role / Device Role / Timing Role: Quad-input S/PDIF selector and format converter; uses LOCK pin to gate analog output during source switching to avoid clicks. Use Value: Four hardware-selectable SPDIF inputs reduce external multiplexer complexity; soft mute prevents audible transients during source changes. |
| CD Player Digital Audio Interface | Professional Audio Monitor Converter |
|
Use Scenario: Converting CD-transport S/PDIF output to analog for headphone amplifier or powered monitors with minimal latency. IC Role / Device Role / Timing Role: IEC 60958 decoder with automatic de-emphasis; crystal-derived 44.1 kHz clock ensures jitter-free playback timing. Use Value: Integrated de-emphasis restores original CD mastering; −88 dB THD+N meets CD audio fidelity standards without post-filtering. |
Use Scenario: Bridging digital studio gear (AES3, I2S) to analog monitoring chains in broadcast control rooms requiring low-noise conversion. IC Role / Device Role / Timing Role: High-SNR ADC/DAC with 24-bit resolution and independent channel volume control for precise level matching. Use Value: 97 dB ADC SNR and 98 dB DAC SNR enable critical listening applications; PGA allows calibration to varying source levels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar stereo audio codec applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AK4118VN | Supports AES3 and S/PDIF; higher 105 dB DAC SNR; requires external crystal oscillator; no integrated PGA | Better suited for professional AES3 environments; lacks on-chip gain control for line-level inputs | Select AK4118VN when AES3 compatibility and ultra-low noise are prioritized over integrated analog front-end simplicity |
| CS4272-KQZ | 24-bit, 192 kHz capable; I2S/PCM only (no S/PDIF transceiver); integrated headphone amp; lower 85 dB THD+N | Targeted at portable audio with headphone drive; no S/PDIF decode/encode functionality | Choose CS4272-KQZ for battery-powered designs needing headphone output but not S/PDIF interface capability |
Compared with UDA1355H/N2,518, AK4118VN offers superior SNR and AES3 support but demands external signal conditioning for line inputs, while CS4272-KQZ adds headphone drive at the cost of S/PDIF functionality and higher distortion-making UDA1355H/N2,518 the optimal choice for fixed-line S/PDIF-centric consumer audio systems.
Availability
UDA1355H/N2,518 is available at Aetrix Electronics and suitable for digital audio receivers, set-top boxes, and AV receivers requiring stable component supply, long-lifecycle support, and guaranteed traceability for CE/FCC-certified production.
Supply support for UDA1355H/N2,518 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
NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and consumer applications, with deep expertise in mixed-signal audio and interface ICs.
The UDA1355H/N2,518 belongs to NXP's legacy audio codec product line designed specifically for cost-sensitive, high-fidelity consumer audio systems requiring integrated S/PDIF transceivers and analog conversion in a single QFP package.
FAQ
What is the required crystal specification for UDA1355H/N2,518?
The UDA1355H/N2,518 requires a 12.288 MHz fundamental-mode crystal with 10 pF load capacitance. This exact frequency is mandatory to generate precise 32 kHz, 44.1 kHz, and 48 kHz audio clocks and their integer multiples (e.g., 256fs = 11.2896 MHz for 44.1 kHz). Using any other frequency will result in incorrect sampling rates and audible artifacts. The crystal must be connected between XTALIN (pin 13) and XTALOUT (pin 14), with no series resistor.
Does UDA1355H/N2,518 support AES3 digital audio format?
No, UDA1355H/N2,518 does not support AES3. It is compliant exclusively with IEC 60958-1 (S/PDIF) for both input and output. While AES3 and S/PDIF share the same physical layer encoding, UDA1355H/N2,518 lacks the differential receiver circuitry and XLR-compatible signaling required for AES3. Its SPDIF inputs (SPDIF0–SPDIF3) accept single-ended CMOS or TTL-level signals only, not balanced AES3 differential pairs.
How does the LOCK pin function in UDA1355H/N2,518 operation?
The LOCK pin (pin 4) is an open-drain output that goes high when the internal PLL achieves stable lock to the incoming S/PDIF or digital audio clock. When LOCK is low, the UDA1355H/N2,518 automatically mutes the DAC outputs and digital interface outputs to prevent noise bursts. This signal can also be used by system firmware to disable downstream audio paths or trigger re-synchronization routines. Its assertion time is ≤250 μs after valid clock acquisition.
Can UDA1355H/N2,518 operate without a crystal oscillator?
No, the UDA1355H/N2,518 requires the 12.288 MHz crystal oscillator to be present at all times. Even in PLL-locked mode, the crystal remains active to provide a stable reference for the interpolator and noise shaper. If the crystal is omitted, the noise shaper spectrum shifts into the audio band during SPDIF dropouts, causing audible distortion. A ceramic resonator may substitute only if absolute frequency accuracy is not required.
What are the supported digital audio interface formats on UDA1355H/N2,518?
The UDA1355H/N2,518 supports I2S-bus, MSB-justified, and LSB-justified formats with 16-, 18-, 20-, and 24-bit word lengths. Data rates range from 16 kHz to 100 kHz. BCK and WSI/WSO signals operate in master or slave mode depending on configuration. In static mode, only 16- and 24-bit LSB-justified and I2S are supported; microcontroller mode enables full format flexibility including 18/20-bit variants and dynamic format switching via register writes.
UDA1355H/N2,518 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 44-QFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Stereo Audio
- Data Interface:
- I2C, Serial
- Resolution (Bits):
- 24 b
- Number of ADCs / DACs:
- 2 / 2
- Sigma Delta:
- No
- S/N Ratio, ADCs / DACs (db) Typ:
- 97 / 98
- Dynamic Range, ADCs / DACs (db) Typ:
- -
- Voltage - Supply, Analog:
- 2.7V ~ 5.5V
- Voltage - Supply, Digital:
- 2.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 44-PQFP (10x10)
UDA1355H/N2,518 FAQ
1.How can I place an order for UDA1355H/N2,518 through Aetrix?
Please submit a Request for Quotation (RFQ) for UDA1355H/N2,518 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 UDA1355H/N2,518 reliable?
The price and inventory of UDA1355H/N2,518 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UDA1355H/N2,518 is usually 5 days.
3.What payment methods are accepted for UDA1355H/N2,518?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UDA1355H/N2,518 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UDA1355H/N2,518?
UDA1355H/N2,518 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UDA1355H/N2,518 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 UDA1355H/N2,518?
For technical support, including UDA1355H/N2,518 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UDA1355H/N2,518 requirements.
6.How does Aetrix verify that UDA1355H/N2,518 is sourced from the original manufacturer or authorized distributors?
All UDA1355H/N2,518 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 UDA1355H/N2,518 meets industry standards.
7.What is the process for return or replacement of UDA1355H/N2,518?
All UDA1355H/N2,518 units undergo pre-shipment inspection (PSI). If there is an issue with UDA1355H/N2,518, 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 UDA1355H/N2,518 part is unused and in its original packaging.
Return procedure for UDA1355H/N2,518:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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