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Texas Instruments SRC4194IPAGR
- Part No.:
- SRC4194IPAGR
- Manufacturer:
- Texas Instruments
- Category:
- Audio Special Purpose
- Package:
- 64-TQFP
- Datasheet:
-
SRC4194IPAGR.pdf
- Description:
- IC SAMPLE RATE CONVERTER 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,291
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Product details
Overview
SRC4194IPAGR from Texas Instruments is a four-channel asynchronous sample rate converter (ASRC) designed for professional audio systems. It supports input/output sampling rates up to 212kHz, achieves 144dB dynamic range and −140dB THD+N, and operates across a 16:1 to 1:16 input-to-output sampling ratio. It is used in digital mixing consoles and broadcast studio equipment where precise, low-jitter sample rate translation between disparate audio domains is required.
For engineers reviewing the SRC4194IPAGR datasheet, SRC4194IPAGR pinout, SRC4194IPAGR application, or SRC4194IPAGR equivalent, this page delivers verified technical context, hardware/software mode configuration details, TQFP-64 package layout, and real-world audio system integration guidance - all grounded in TI's SBFS025B specification.
Technical Context
The SRC4194IPAGR implements dual-path, high-precision polyphase FIR filtering with programmable group delay options (8/16/32/64-sample buffers) and direct downsampling capability in the decimation filter. Its interpolation filter delivers >140dB stopband attenuation and ±0.007dB passband ripple, enabling ultra-low distortion conversion across wide fsIN/fsOUT ratios.
It supports two independent audio channels (A and B), each configurable via hardware pins or SPI software control. The device accepts I²S, left/right-justified, and TDM formats on both input and output serial ports, with TDM daisy-chaining support for up to four devices - critical for multi-channel broadcast routing and DAW expansion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 4-channel (2 independent dual-channel paths A/B) |
| Sampling Ratio Range | 16:1 (downsampling) to 1:16 (upsampling) - enables flexible clock domain bridging |
| Max Sampling Rate | 212kHz input and output - supports high-resolution audio including 192kHz PCM |
| Dynamic Range | 144dB at −60dBFS input (A-weighted, BW = 20Hz–fs/2) - preserves low-level detail in mastering |
| THD+N | −140dB at 0dBFS input (BW = 20Hz–fs/2) - meets broadcast-grade distortion requirements |
| Digital Attenuation | 256-step software-controlled attenuation (0dB to −127.5dB, 0.5dB steps) - precise level matching without analog stages |
| Power Supply | +1.8V core (or +3.3V with internal regulator) + +1.65V to +3.6V I/O - simplifies mixed-voltage board design |
Pinout & Package
Package: TQFP-64 (10mm × 10mm, 0.5mm pitch), thermally enhanced for sustained audio processing loads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SDINA / SDOUTA | A-channel serial data I/O | Primary audio data path for channel A; supports full-duplex I²S/TDM operation |
| LRCKIA / LRCKOA | A-channel word clock I/O | Left/right frame sync for input/output - determines sample boundary timing |
| BCKIA / BCKOA | A-channel bit clock I/O | Bit-synchronous clocking; frequency = fs × word length × channels - drives data latch timing |
| RCKIA / RCKIB | Reference clock inputs | Independent master clocks per channel; minimum 128×fsMIN - enables fully asynchronous operation |
| H/S | Hardware/Software mode select | Pin-strapped control: '0' = software (SPI) mode; '1' = hardware pin-programmed mode |
| RST | Reset & hard power-down | Active-low synchronous reset; also forces hard power-down (<100µA supply current) |
| MODEA0–2 / MODEB0–2 | Serial port mode config (HW mode) | Selects I²S/left/right-justified/TDM format and master/slave role per channel |
| IFMTA0–2 / OFMTA0–2 | Input/output format control (HW mode) | Defines data alignment, polarity, and TDM slot assignment - no software register access needed |
Key Features
| Feature | Design Value |
|---|---|
| Automatic ratio detection | Eliminates manual ratio programming - detects fsIN/fsOUT in real time for plug-and-play interoperability |
| Four group delay options | Configurable 8/16/32/64-sample interpolation buffer - balances latency vs. filter performance in live monitoring |
| TDM daisy-chaining | Supports up to four SRC4194IPAGR devices on one serial bus - reduces PCB routing complexity in multi-channel systems |
| Digital de-emphasis | User-selectable 32/44.1/48kHz filters - restores legacy CD/PCM pre-emphasized content without external DSP |
| Soft mute & bypass modes | Glitch-free muting and direct signal pass-through - enables zero-latency failover and diagnostic routing |
Applications
| Digital Mixing Console | Digital Audio Workstation |
|---|---|
Use Scenario: Integrating AES/EBU digital inputs (44.1kHz) with native 48kHz or 96kHz DAW engine clock domains. IC Role / Device Role / Timing Role: Asynchronous sample rate converter bridging mismatched clock domains while preserving phase coherence and jitter immunity. Use Value: Enables seamless multitrack recording and playback without resampling artifacts or clock-induced clicks/pops. | Use Scenario: Expanding I/O count of a PCIe-based audio interface using multiple SRC4194IPAGR units in TDM daisy-chain topology. IC Role / Device Role / Timing Role: Four-channel ASRC providing synchronized, low-latency sample rate translation for 32-channel ADAT/TDM expansion. Use Value: Doubles effective channel count without requiring additional FPGA logic or custom clock distribution. |
| Broadcast Studio Equipment | Audio Distribution System |
Use Scenario: Converting 192kHz studio master recordings to 48kHz broadcast delivery format with minimal spectral degradation. IC Role / Device Role / Timing Role: High-fidelity ASRC performing 4:1 downsampling with >140dB stopband rejection and <0.001dB de-emphasis error. Use Value: Meets EBU R68 and ATSC A/53 loudness and fidelity requirements for HD broadcast origination. | Use Scenario: Distributing synchronized 96kHz audio streams across multiple DSP-based loudspeaker management units over long cable runs. IC Role / Device Role / Timing Role: Clock-domain isolator converting externally sourced reference clocks to local domain clocks with sub-picosecond jitter accumulation. Use Value: Prevents clock skew-induced phase misalignment between distributed amplifiers and processors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar asynchronous sample rate conversion applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AK4128AVQ | 2-channel ASRC; max 216kHz; 130dB DR; no TDM daisy-chain; SPI-only control | Limited to stereo applications; lacks hardware pin-programmable mode and 4-channel density | Choose when cost-sensitive stereo conversion suffices and board space is constrained. |
| CS8422-CQZ | 2-channel ASRC; max 212kHz; 132dB DR; supports S/PDIF I/O; no digital de-emphasis | Includes integrated S/PDIF receiver/transmitter; targets consumer/prosumer gear rather than broadcast-grade audio | Prefer when S/PDIF interfacing is mandatory and broadcast-level DR is not required. |
Compared with AK4128AVQ and CS8422-CQZ, the SRC4194IPAGR provides double the channel count, higher dynamic range (144dB vs ≤132dB), hardware/software dual-mode flexibility, and TDM scalability - making it uniquely suited for high-density, mission-critical broadcast and studio infrastructure.
Availability
SRC4194IPAGR is available at Aetrix Electronics and suitable for digital mixing consoles, broadcast studio equipment, and audio distribution systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for industrial deployment.
Supply support for SRC4194IPAGR 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and high-performance signal chain solutions.
The SRC4194IPAGR belongs to TI's professional audio IC portfolio, engineered specifically for low-jitter, high-fidelity sample rate conversion in broadcast, studio, and live sound environments where timing integrity and dynamic range are non-negotiable.
FAQ
What is the maximum supported input and output sampling rate for the SRC4194IPAGR?
The SRC4194IPAGR supports input and output sampling rates up to 212kHz, as confirmed in the Electrical Characteristics table of the SBFS025B datasheet. This enables compatibility with high-resolution audio formats including 192kHz PCM and emerging studio standards. The device maintains full 144dB dynamic range and −140dB THD+N performance across this entire range under specified operating conditions.
Does the SRC4194IPAGR support TDM mode, and how many devices can be daisy-chained?
Yes, the SRC4194IPAGR supports TDM mode on both input and output serial ports, and the datasheet explicitly states that up to four devices can be daisy-chained in TDM configuration. This is enabled by dedicated TDMI/TDMO pins and internal framing logic that allows cascaded time-slot allocation without external multiplexing logic - a key advantage for scalable multi-channel audio routing.
How does the SRC4194IPAGR handle reference clock jitter, and what is its impact on audio performance?
The SRC4194IPAGR uses asynchronous sample rate conversion architecture with independent PLL-free interpolation/decimation filters, making it inherently insensitive to input reference clock jitter. Jitter on RCKIA/RCKIB affects only the internal timing margin, not the converted audio output spectrum - verified by FFT plots in the datasheet showing consistent −140dB THD+N regardless of clock source quality. This eliminates need for ultra-low-jitter crystal oscillators in downstream systems.
Can the SRC4194IPAGR operate from a single 3.3V supply, and what are the voltage requirements for VDD18 and REGEN?
Yes, the SRC4194IPAGR can operate from a single +3.3V supply. When REGEN = 1 (high), the internal regulator generates the required +1.8V core voltage, so VDD18 must be left unconnected. VDD33 must be supplied at +3.0V to +3.6V, and VIO (digital I/O supply) must be between +1.65V and +3.6V - allowing direct interfacing with 1.8V, 2.5V, or 3.3V logic families without level shifters.
What are the key differences between Hardware Mode and Software Mode operation of the SRC4194IPAGR?
In Hardware Mode (H/S = 1), configuration is set via dedicated pins (IFMTx, OFMTx, MODEx, etc.) - enabling standalone operation without a microcontroller. In Software Mode (H/S = 0), all settings are controlled via the 4-wire SPI interface (CS/CCLK/CDIN/CDOUT), allowing dynamic reconfiguration and status readback (e.g., RATIOA/RATIOB flags). Pin functions like MODEB0–2 become SPI signals, and hardware control pins are disabled per the Pin Descriptions table.
SRC4194IPAGR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 64-TQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Sample Rate Converter
- Applications:
- Digital Audio Interfacing
- Number of Channels:
- 4
- Interface:
- I2S, TDM
- Voltage - Supply:
- 1.8V, 3.3V
- Operating Temperature:
- -45°C ~ 85°C (TA)
- Specifications:
- 4kHz ~ 212kHz
- Mounting Type:
- Surface Mount
- Grade:
- -
SRC4194IPAGR FAQ
1.How can I place an order for SRC4194IPAGR through Aetrix?
Please submit a Request for Quotation (RFQ) for SRC4194IPAGR 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 SRC4194IPAGR reliable?
The price and inventory of SRC4194IPAGR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SRC4194IPAGR is usually 5 days.
3.What payment methods are accepted for SRC4194IPAGR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SRC4194IPAGR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SRC4194IPAGR?
SRC4194IPAGR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SRC4194IPAGR 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 SRC4194IPAGR?
For technical support, including SRC4194IPAGR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SRC4194IPAGR requirements.
6.How does Aetrix verify that SRC4194IPAGR is sourced from the original manufacturer or authorized distributors?
All SRC4194IPAGR 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 SRC4194IPAGR meets industry standards.
7.What is the process for return or replacement of SRC4194IPAGR?
All SRC4194IPAGR units undergo pre-shipment inspection (PSI). If there is an issue with SRC4194IPAGR, 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 SRC4194IPAGR part is unused and in its original packaging.
Return procedure for SRC4194IPAGR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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