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Texas Instruments DF1704E/2KG4
- Part No.:
- DF1704E/2KG4
- Manufacturer:
- Texas Instruments
- Category:
- Audio Special Purpose
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
DF1704E/2KG4.pdf
- Description:
- IC INTERPOLATION FILTER 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,814
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Product details
Overview
DF1704E/2KG4 from Texas Instruments is a stereo, 24-bit, 96kHz 8× oversampling digital interpolation filter IC designed for high-end audio systems. It provides programmable filter response (sharp/slow roll-off), digital de-emphasis, independent left/right attenuation, and supports I²S/standard/left-justified input formats with 16–24-bit word lengths. It serves as the companion filter to the PCM1704 DAC in premium CD players, DAC modules, and studio-grade digital audio converters.
For engineers reviewing the DF1704E/2KG4 datasheet, DF1704E/2KG4 pinout, DF1704E/2KG4 application, or DF1704E/2KG4 equivalent, key selection criteria include stopband attenuation (–115 dB), passband ripple (±0.00005 dB), system clock flexibility (256fS–768fS), on-chip crystal oscillator support, and hardware/software configuration modes for production scalability and design reuse.
Technical Context
The DF1704E/2KG4 implements a fixed-coefficient FIR interpolation filter with 8× oversampling, operating on 24-bit input data at sampling rates from 32 kHz to 96 kHz. Its dual-mode control architecture supports both hardware-pin configuration (MODE = L) and 3-wire serial software programming (MODE = H), enabling flexible integration into DSP-based or discrete logic audio subsystems.
It features an integrated crystal oscillator (XTI/XTO) supporting up to 24.576 MHz, buffered system clock output (CLKO), and fully synchronous audio I/O with BCKIN/LRCIN/DIN inputs and BCKO/WCKO/DOL/DOR outputs. All digital I/O uses Schmitt-trigger inputs with defined VIH/VIL thresholds and supports MSB-first, two's complement data formatting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit - Enables >144 dB theoretical SNR and full dynamic range preservation in high-fidelity audio chains. |
| Sampling Rate Range | 32 kHz to 96 kHz - Covers CD (44.1 kHz), DAT (48 kHz), and high-res audio (96 kHz) standards without reconfiguration. |
| Stopband Attenuation | –115 dB at 0.546fS - Suppresses imaging artifacts beyond Nyquist by >110 dB, critical for DAC reconstruction fidelity. |
| Passband Ripple | ±0.00005 dB - Maintains flat amplitude response across audible band (<20 kHz), preserving tonal accuracy. |
| System Clock Options | 256fS, 384fS, 512fS, 768fS - Allows clock tree optimization for jitter reduction and EMI management in mixed-signal PCBs. |
| Power Supply | +5 V single supply (4.5–5.5 V) - Simplifies power design and enables direct interface with legacy 5 V logic and DACs like PCM1704. |
| Operating Temperature | –25°C to +85°C - Qualified for industrial and consumer audio equipment environments including rack-mounted DACs and pro audio interfaces. |
Pinout & Package
DF1704E/2KG4 is housed in a 28-pin SSOP package (324 drawing code), with exposed pad not electrically connected. Pin functions are validated per TI SBAS099A datasheet revision A, including Schmitt-trigger input conditioning on all control and data pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIN (1) | Serial audio data input | MSB-first, two's complement input data; sampled on rising edge of BCKIN for synchronization with source clock domain. |
| BCKIN (2) | Input bit clock | Accepts 32fS/48fS/64fS; defines data rate and timing reference for DIN and LRCIN alignment. |
| LRCIN (28) | Left/right channel clock input | Word latch signal at fS; polarity configurable via LRIP pin to match source (e.g., Sony vs. Philips format). |
| DOL / DOR (24/23) | Left/right serial audio outputs | Right-justified, MSB-first, two's complement outputs synchronized to BCKO/WCKO for seamless DAC interfacing. |
| CLKO (9) | Buffered system clock output | Provides clean, low-jitter clock derived from XTI or internal oscillator; selectable frequency (XTI or XTI/2) via CKO pin. |
| RST (14) | Asynchronous reset input | Active-low; forces internal state reset and holds outputs LOW for 1024 system clocks-ensures deterministic startup with DACs. |
| MODE (10) | Control mode select | H = software mode (3-wire serial interface); L = hardware mode (pin-strapped configuration)-enables factory-programmable or field-configurable behavior. |
Key Features
| Feature | Design Value |
|---|---|
| 8× Oversampling FIR Filter | Reduces DAC image energy by >115 dB while maintaining ±0.00005 dB passband flatness-eliminates need for external analog anti-imaging filters. |
| Programmable Roll-Off Response | Sharp (0.454fS–0.493fS) or slow (0.254fS–0.460fS) transition band selection via SRO pin-supports subjective tuning for transient response vs. alias suppression trade-offs. |
| Digital De-Emphasis | Hardware-enabled (DEM pin) with sample-rate-selectable (32/44.1/48 kHz) correction-restores RIAA-curve pre-emphasized CD playback without external circuitry. |
| Independent Channel Attenuation | 0.5 dB step resolution (–127.5 dB to 0 dB) via MODE0/MODE1 registers or hardware pins-enables precise channel balance and volume control in digital domain. |
| On-Chip Crystal Oscillator | Supports fundamental-mode crystals up to 24.576 MHz (XTI/XTO)-removes need for external clock generator, reducing BOM count and jitter sources. |
| Flexible Audio Interface | Configurable input (I²S/standard/left-justified) and output (right-justified) formats with 16/18/20/24-bit word length-interoperates with diverse SoCs, DSPs, and legacy audio processors. |
Applications
| CD Player Digital Front-End | High-Resolution DAC Module |
|---|---|
|
Use Scenario: Digital audio processing stage in standalone CD transport or integrated CD player, receiving SPDIF or AES3 input via receiver IC. IC Role / Device Role / Timing Role: Interpolation filter and format translator between receiver and PCM1704 DAC; provides de-emphasis, mute, and sample-rate-aligned clocking. Use Value: Enables bit-perfect 44.1 kHz CD playback with RIAA correction, sharp roll-off filtering, and zero-latency mute-meeting Red Book compliance without analog components. |
Use Scenario: Core digital filter in modular 24-bit/96 kHz DAC board used in audiophile headphone amps and preamplifiers. IC Role / Device Role / Timing Role: High-precision interpolation engine feeding dual PCM1704 channels; supplies BCKO/WCKO clocks and right-justified 24-bit data streams. Use Value: Delivers –115 dB stopband rejection and ±0.00005 dB passband ripple-preserving micro-dynamics and harmonic integrity required for critical listening applications. |
| Studio Audio Interface Digital Path | Professional Broadcast Audio Converter |
|
Use Scenario: Digital audio path in multi-channel USB/ADAT audio interface handling 44.1/48/96 kHz sample rates with format conversion. IC Role / Device Role / Timing Role: Format-flexible interpolation filter accepting variable input formats and generating synchronized DAC-ready outputs with programmable attenuation. Use Value: Supports hardware-mode pin-strapping for fixed configurations or software-mode register writes for dynamic channel gain adjustment-ideal for firmware-upgradable products. |
Use Scenario: Digital audio processing block in broadcast-grade AES3-to-analog converter used in OB vans and master control rooms. IC Role / Device Role / Timing Role: Jitter-tolerant interpolation filter with on-chip oscillator; accepts asynchronous AES3-derived clocks and generates low-jitter DAC clocks via CLKO. Use Value: Eliminates external clock cleaners and PLLs-reducing phase noise and simplifying layout while meeting SMPTE 276M timing stability requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digital interpolation filter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CIRRUS LOGIC CS8416-CQZ | SDIF-2/SPDIF receiver with integrated 8× interpolator; no on-chip oscillator; requires external clock; 20-bit max resolution. | Designed for direct digital input reception-not optimized as standalone filter for DAC-feeding applications. | Choose when SPDIF/AES3 input interface is mandatory and system already includes clock generation; avoid when replacing DF1704E/2KG4 in PCM1704-based designs. |
| AKM AK4128VN | 24-bit, 192 kHz-capable digital filter with I²S-only interface; no hardware mode; no de-emphasis; higher power (40 mA). | Targets modern high-res audio (192 kHz), lacks CD-specific de-emphasis and pin-strapped configuration. | Choose for new 192 kHz designs requiring software-only control; not suitable for drop-in replacement where de-emphasis or hardware mode is required. |
Compared with CS8416-CQZ and AK4128VN, DF1704E/2KG4 uniquely combines on-chip oscillator, hardware/software dual-mode control, CD-standard de-emphasis, and ultra-low-passband ripple-making it irreplaceable in legacy high-fidelity DAC architectures built around PCM1704.
Availability
DF1704E/2KG4 is available at Aetrix Electronics and suitable for high-end audio equipment, professional DAC modules, and studio interface designs requiring stable component supply, long-term obsolescence management, and traceable sourcing.
Supply support for DF1704E/2KG4 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 with over 50 years of audio IC heritage.
The DF1704E/2KG4 belongs to TI's premium audio digital filter product line, engineered specifically to enable ultra-low-distortion, high-SNR audio systems when paired with TI's PCM1704 and other 24-bit DACs.
FAQ
What is the primary function of the DF1704E/2KG4 in an audio system?
The DF1704E/2KG4 is a dedicated 8× oversampling digital interpolation filter IC that prepares digital audio data for high-resolution DAC conversion. Its core function is to increase sample rate, suppress imaging artifacts with –115 dB stopband attenuation, and provide format translation-ensuring optimal signal integrity before the PCM1704 or similar DAC. DF1704E/2KG4 does not perform D/A conversion itself but is essential for achieving published DAC performance.
Does the DF1704E/2KG4 require an external crystal, or can it operate with its internal oscillator?
The DF1704E/2KG4 integrates a crystal oscillator circuit and can operate with an external fundamental-mode crystal connected between XTI and XTO pins-supporting frequencies up to 24.576 MHz. It does not contain a fully self-contained oscillator; an external crystal is required for oscillator mode. Alternatively, a clean external clock may be applied directly to XTI, bypassing the crystal.
Can the DF1704E/2KG4 be used with sampling rates other than 44.1 kHz and 48 kHz?
Yes, the DF1704E/2KG4 supports sampling rates from 32 kHz to 96 kHz, including 32 kHz, 44.1 kHz, 48 kHz, and 96 kHz. De-emphasis is only active at 32 kHz, 44.1 kHz, and 48 kHz per datasheet specification; however, full interpolation filtering, format translation, and attenuation functions remain fully operational at 96 kHz.
How does the hardware mode (MODE = L) differ from software mode (MODE = H) in DF1704E/2KG4 configuration?
In hardware mode (MODE = L), configuration is set via dedicated pins (I2S, IW0/IW1, OW0/OW1, SRO, DEM, etc.), enabling fixed-function operation without microcontroller involvement. In software mode (MODE = H), four internal registers (MODE0–MODE3) are programmed via a 3-wire serial interface (ML/MC/MD), allowing dynamic runtime reconfiguration. DF1704E/2KG4 supports both-hardware mode suits cost-sensitive fixed designs; software mode enables feature-rich, firmware-upgradable systems.
Is the DF1704E/2KG4 pin-compatible with other members of the DF17xx family?
No, the DF1704E/2KG4 is not pin-compatible with other DF17xx variants such as DF1702 or DF1708. Each device has distinct pin assignments, register maps, and feature sets. The DF1704E/2KG4 specifically implements 24-bit/96 kHz capability with sharp/slow roll-off selection and on-chip oscillator support-features not shared across the entire family. Always verify pinout and electrical characteristics against the specific part number's datasheet.
DF1704E/2KG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SoundPlus™
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Interpolation Filter
- Applications:
- Consumer Audio, Professional Audio
- Number of Channels:
- 2
- Interface:
- I2S
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -25°C ~ 85°C (TA)
- Specifications:
- 32kHz ~ 96kHz
- Mounting Type:
- Surface Mount
- Grade:
- -
DF1704E/2KG4 FAQ
1.How can I place an order for DF1704E/2KG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for DF1704E/2KG4 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 DF1704E/2KG4 reliable?
The price and inventory of DF1704E/2KG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DF1704E/2KG4 is usually 5 days.
3.What payment methods are accepted for DF1704E/2KG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DF1704E/2KG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DF1704E/2KG4?
DF1704E/2KG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DF1704E/2KG4 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 DF1704E/2KG4?
For technical support, including DF1704E/2KG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DF1704E/2KG4 requirements.
6.How does Aetrix verify that DF1704E/2KG4 is sourced from the original manufacturer or authorized distributors?
All DF1704E/2KG4 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 DF1704E/2KG4 meets industry standards.
7.What is the process for return or replacement of DF1704E/2KG4?
All DF1704E/2KG4 units undergo pre-shipment inspection (PSI). If there is an issue with DF1704E/2KG4, 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 DF1704E/2KG4 part is unused and in its original packaging.
Return procedure for DF1704E/2KG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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