PCM1704U-J - 24-Bit 96kHz Sign-Magnitude DAC | Texas Instruments
MPN： PCM1704U-J ✗ 停產PCM1704U-J 概覽
A sign-magnitude DAC is a digital-to-analog converter architecture that uses two complementary current sources switched in opposite phase per bit, rather than a thermometer-coded unary or segmented topology. This approach eliminates the major-carry switching glitches inherent in conventional binary-weighted DACs, yielding -40 dB lower glitch energy. In the broader hierarchy, the PCM1704U-J sits as an audio DAC, which is a sub-category of data-converter IC, itself under the mixed-signal IC umbrella in signal chain products. The BiCMOS process pairs bipolar precision transistors with CMOS logic, achieving fast settling of ±1.2 mA in 200 ns while drawing modest operating current.
The PCM1704U-J supports sampling frequencies from 16 kHz to 96 kHz with 8X oversampling when paired with a digital interpolation filter. Its fast current output of ±1.2 mA in 200 ns enables clean reproduction of transients in high-resolution audio material. Internal glitch-free differential current outputs eliminate mid-scale code-dependent distortion, while the on-chip precision bandgap reference stabilizes the output compliance over temperature.
Typical applications include high-end consumer CD/SACD players, professional studio digital mixers, audiophile outboard DACs, and mastering-grade A/D converters. The wide dynamic range also makes it useful in measurement instrumentation where 24-bit resolution at high update rates is required.
Key design considerations include using a true differential current-to-voltage converter (typically an op-amp such as the OPA1612 or OPA2134) and a low-noise voltage reference to bias the I-to-V stage. The 20-pin SOIC requires a standard SOIC-20 footprint, with analog and digital grounds tied at a single star point near the device.
This page synthesizes manufacturer datasheet specifications, current distributor pricing, drop-in same-family alternatives within TI's PCM1704 grading scheme, and practical application circuits that are not consolidated in the original datasheet.
直接替換替代品，適用於 PCM1704U-J — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： PCM1704U-J （相同外形與佔位） — 差異在於 Package, Resolution, Converter Type, Operating Temperature, Architecture.
PCM1704U-K/2K
✅ 直接替換📋 參考替代品（不在目錄中）
PCM1704U
✅ 直接替換聯絡詢價
查看資料表 →PCM1704U-J/2K
✅ 直接替換📋 參考替代品（不在目錄中）
PCM1704U-K
✅ 直接替換聯絡詢價
查看資料表 →PCM1704U/2K
✅ 直接替換📋 參考替代品（不在目錄中）
PCM1704U-J 最大額定值與電氣特性
| Converter Type | Sign-Magnitude Audio DAC |
| 解析度 | 24-bit |
| Sampling Frequency | 16 kHz to 96 kHz |
| Oversampling Support | 8X at 96 kHz (with external interpolation filter) |
| Dynamic Range | 112 dB typ (K grade); J grade lower |
| Signal-to-Noise Ratio (SNR) | 120 dB typ |
| THD+N (J Grade) | 0.0008% typ |
| Current Output | ±1.2 mA |
| Output Settling Time | 200 ns |
| Process Technology | BiCMOS |
| Input Data Format | Serial, 24-bit audio word |
| 封裝 | 20-pin SOIC |
| 安裝類型 | Surface Mount |
| 工作溫度 | -25C to +85C |
PCM1704U-J 腳位配置
| 腳位 1 | VCC — +5 V analog supply |
| 腳位 2 | LRCK — Left/right word clock input |
| 腳位 3 | DATA — Serial audio data input |
| 腳位 4 | BCK — Bit clock input |
| 腳位 5 | SYSCLK — System clock input |
| 腳位 6 | GND — Digital ground |
| 腳位 7 | VEE — Negative analog supply (-5 V) |
| 腳位 8 | I_OUT+ — Positive current output |
| 腳位 9 | I_OUT- — Negative (complementary) current output |
| 腳位 10 | NC — Not connected per datasheet |
| 腳位 11 | AGND — Analog ground |
| 腳位 12 | VREF — Voltage reference (bias for I-to-V) |
| 腳位 13 | NC — Not connected per datasheet |
| 腳位 14 | NC — Not connected per datasheet |
| 腳位 15 | NC — Not connected per datasheet |
| 腳位 16 | NC — Not connected per datasheet |
| 腳位 17 | NC — Not connected per datasheet |
| 腳位 18 | NC — Not connected per datasheet |
| 腳位 19 | NC — Not connected per datasheet |
| 腳位 20 | NC — Not connected per datasheet |
典型應用
PCM1704U-J 適用於 6 應用s: High-End CD/SACD Player, Professional Studio Digital Mixer, Audiophile Outboard DAC, Mastering-Grade A/D Converter, Broadcast Audio Equipment, Musical Instrument Digital Interface (MIDI) Synthesizer.
High-End CD/SACD Player
The PCM1704U-J fits audiophile CD/SACD player designs because its sign-magnitude topology eliminates mid-scale code-dependent glitches that binary-weighted DACs exhibit. With 120 dB SNR typical and 0.0008% THD+N at the J grade, the device delivers resolution and dynamic range sufficient for 24-bit/96 kHz source material. According to the manufacturer datasheet, it accepts 16 kHz to 96 kHz sampling with 8X oversampling when paired with an external interpolation filter such as the DF1704 or DIR9001. Pair the differential ±1.2 mA current outputs with a low-noise I-to-V converter (OPA1612 or OPA2134) and a star-grounded analog supply to preserve dynamic performance.
推薦
Professional Studio Digital Mixer
Studio digital mixing consoles benefit from the PCM1704U-J's 24-bit resolution at 96 kHz update rates, providing the low distortion headroom required for bus summing and monitor output stages. The 200 ns current-output settling handles transient-rich program material without slew-induced artifacts. Per the TI datasheet, the BiCMOS sign-magnitude architecture yields -40 dB lower glitch energy than conventional binary-weighted topologies, which is critical for preserving stereo imaging. Use a dual-supply (±15 V or ±12 V) rail for the I-to-V op-amp to maximize output swing in balanced professional line drivers.
推薦
Audiophile Outboard DAC
Standalone audiophile DACs leverage the PCM1704U-J's 120 dB SNR to deliver transparent playback of 24-bit high-resolution recordings. The differential current output topology inherently rejects common-mode power supply noise when driven from a low-noise regulator. The part operates over -25C to +85C per the manufacturer datasheet, suitable for consumer hi-fi equipment. Use a star-ground layout and separate analog/digital ground planes tied at one point near the device's GND pin to maximize dynamic performance. DAC designers often pair it with a tube or discrete output stage for harmonic character.
推薦
Mastering-Grade A/D Converter
In mastering audio interfaces, the PCM1704U-J serves as the monitor/reference DAC path, with its 120 dB SNR allowing direct comparison against the A/D conversion chain without adding audible coloration. Per the TI datasheet, its BiCMOS sign-magnitude topology provides THD+N of 0.0008% at J grade, low enough to be inaudible in critical listening. Pair with a high-precision master clock (e.g., crystal oscillator with <5 ppm jitter) and a low-jitter PLL such as the DIR9001 to extract the bit clock. AES3 balanced digital input is standard, with the I-to-V stage operating from a clean ±15 V supply.
推薦
Broadcast Audio Equipment
Broadcast audio routers and processors use the PCM1704U-J for monitoring output paths because its 120 dB SNR typical exceeds broadcast chain dynamic range requirements, leaving headroom for downstream mixers. Per the TI datasheet, the 24-bit/96 kHz capability supports modern AES3 and Dante broadcast formats. The ±1.2 mA differential current output stage rejects ground-loop noise common in broadcast facility wiring. Use isolation transformers (such as the PE-65612) on the output to comply with broadcast ground-isolation standards.
推薦
Musical Instrument Digital Interface (MIDI) Synthesizer
The PCM1704U-J fits high-end MIDI synthesizers and samplers where faithful playback of 24-bit sample libraries demands ultra-low distortion. The device's 16-96 kHz sampling range covers all standard pro-audio rates, and the BiCMOS sign-magnitude topology eliminates the mid-scale code transition glitches that introduce audible artifacts in fast envelope transients. Per the TI datasheet, the 200 ns settling time is well within budget for even the fastest 96 kHz update intervals. Combine with a low-jitter master clock and current-to-voltage conversion using a high-slew-rate op-amp.
推薦
推薦產品摘要
工程參考資料，適用於 PCM1704U-J — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | PCM1704U-K/2K | PCM1704U | PCM1704U-J/2K | PCM1704U-K | PCM1704U/2K |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 20-pin SOIC | 20-pin SOIC (same) | 20-pin SOIC (same) | 20-pin SOIC (same) | 20-pin SOIC (same) | 20-pin SOIC (same) |
| Performance Grade | J (mid) | K (highest) | U (base) | J (mid) - tape & reel | K (highest) - tray | U (base) - tape & reel |
| Dynamic Range (typ) | Mid (J grade) | 112 dB typ | Lower (U grade spec) | Mid (J grade) | 112 dB typ | Lower (U grade spec) |
| Resolution | 24-bit | 24-bit | 24-bit | 24-bit | 24-bit | 24-bit |
| Sampling Rate | 16-96 kHz | 16-96 kHz | 16-96 kHz | 16-96 kHz | 16-96 kHz | 16-96 kHz |
| Current Output | ±1.2 mA | ±1.2 mA | ±1.2 mA | ±1.2 mA | ±1.2 mA | ±1.2 mA |
| Packaging Format | Tube (J grade standard) | Tape & Reel | Tube | Tape & Reel | Tube/Tray | Tape & Reel |
| Lifecycle Status | Obsolete | Obsolete (K grade) | Obsolete | Obsolete (J grade) | Obsolete (K grade tray) | Obsolete |
主要差異化特點
- Sign-magnitude topology eliminates mid-scale glitches (對比PCM1704U base grade)
- Pin-compatible upgrade to K grade available (對比PCM1704U-K/2K)
- Tape-and-reel option for high-volume assembly (對比PCM1704U-J/2K)
設計說明
The PCM1704U-J requires clean +5 V analog (VCC) and -5 V (VEE) supplies plus a low-noise reference bias. Use a low-dropout regulator such as the TPS7A4701 (4.17 uVrms noise) or a linear pre-regulator. Add 10 uF + 0.1 uF ceramic decoupling close to the VCC and VEE pins to suppress switching noise from upstream digital supplies. Estimated: at ±5 V supplies with 1 mA quiescent draw, power consumption is approximately 10 mW.
Use a star-ground topology with separate analog and digital ground planes tied at a single point near the PCM1704U-J GND pin. Per the manufacturer datasheet, the differential current outputs are sensitive to common-mode ground loops; keep the I_OUT+ and I_OUT- traces equal-length and symmetric to the I-to-V op-amp inputs. Route the serial audio data lines (DATA, BCK, LRCK) away from the analog output traces to minimize digital feedthrough.
Drive the PCM1704U-J with a low-jitter master clock (jitter under 50 ps rms) for optimal 96 kHz dynamic range. Per TI, the SYSCLK input rejects amplitude noise but is sensitive to edge timing; use a dedicated crystal oscillator rather than a recovered PLL clock when possible. Decouple the I-to-V op-amp supply with a low-ESR electrolytic + ceramic to prevent supply-induced distortion.
Do not operate the PCM1704U-J without the VREF bias network or with floating unused inputs - per the datasheet, this can increase mid-scale distortion. The device is obsolete for new designs; consider PCM1794A or PCM1792 for long-term production, though these require PCB redesign. Avoid driving the I-to-V stage with a generic op-amp; use an audio-grade FET-input op-amp with low current noise.
合規資訊
Compliance status not provided in retrieved web data. RoHS, REACH, lead-free, and halogen-free status should be confirmed from the TI product folder before use in regulated markets.