ADS5481IRGC25 - 16-Bit 80MSPS ADC w/ Buffered Input | Texas Instruments
MPN: ADS5481IRGC25 ✓ فعالADS5481IRGC25 نمای کلی
A pipelined ADC is a high-speed converter architecture that uses multiple low-resolution flash stages cascaded in series; each stage resolves a few bits, then passes the residue to the next stage, producing N bits of resolution at sample rates from tens of MSPS to hundreds of MSPS. The ADS5481 belongs to the broader data-converter (ADC/DAC) IC family, which sits within the signal-chain category of mixed-signal semiconductors.
Key features include 16-bit resolution at 80 MSPS, an internal high-impedance analog input buffer that eases front-end driver design, LVDS digital outputs for low-noise data transfer, and excellent SFDR (spurious-free dynamic range) for wideband IF-sampling and baseband digitisation. The buffered input removes the kickback and settling issues typically associated with switched-capacitor ADC inputs, allowing operation behind higher-impedance filter networks.
The converter uses a multi-stage differential pipeline with proprietary calibration to achieve low distortion and stable performance across the industrial temperature range. The internal buffer and reference-voltage circuitry reduce the external component count, simplifying board layout for high-density designs.
Typical applications include communications receivers, radar and electronic-warfare signal processing, test and measurement instrumentation, medical imaging front ends, and high-speed data acquisition systems where both wide bandwidth and high spurious-free dynamic range are required.
When designing with this part, pay close attention to LVDS bus length matching, decoupling on both 5 V and 3.3 V rails, and the analog-input network. Because the input is buffered, anti-alias filter design is more forgiving than with unbuffered switched-capacitor ADCs.
This page synthesises distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, providing an information-gain summary aimed at engineers evaluating the ADS5481IRGC25 for new designs or legacy second-source qualification.
جایگزین‌های drop-in برای ADS5481IRGC25 — همان پکیج، سازگار پین‌به‌پین. قطعات با پکیج متفاوت که نیاز به تغییر PCB دارند مستثنی هستند.
گونه‌ها در این سری
مدل‌های هم‌سری که جایگزین مستقیم هستند برای ADS5481IRGC25 (همان فرم‌فاکتور و فوت‌پرینت) — متفاوت در Input Type, Package, Resolution, Number of Channels, Analog Supply Voltage.
ADS5481IRGCR
✅ جایگزین مستقیم ⚠️ مشخصات تأییدنشده📋 جایگزین مرجع (خارج از کاتالوگ)
ADS5482IRGC25
✅ جایگزین مستقیم ⚠️ مشخصات تأییدنشده📋 جایگزین مرجع (خارج از کاتالوگ)
ADS5483IRGC25
✅ جایگزین مستقیم ⚠️ مشخصات تأییدنشده📋 جایگزین مرجع (خارج از کاتالوگ)
ADS62P48IRGC25
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←ADS62P23IRGC25
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←ADS62P22IRGC25
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←ADS5481IRGC25 حداکثر مقادیر مجاز و مشخصات الکتریکی
| رزولوشن | 16 bit |
| Sample Rate | 80 MSPS |
| Number of Inputs | 1 |
| Architecture | Pipelined |
| Input Type | Buffered Analog, Differential |
| Digital Output Type | LVDS |
| Analog Supply Voltage | 5 V |
| Digital Supply Voltage | 3.3 V |
| دمای کاری | -40 C to +85 C |
| بسته‌بندی | 64-VQFN (RGC) 9x9 mm |
| نوع نصب | Surface Mount |
| وضعیت RoHS | Compliant |
پیکربندی پین ADS5481IRGC25
| پین 1 | AVDD — 5 V analog supply |
| پین 2 | GND — Analog ground |
| پین 3 | INP — Positive analog input |
| پین 4 | INN — Negative analog input |
| پین 5 | VCM — Common-mode voltage output |
| پین 6 | VREF — Internal reference decoupling |
| پین 7 | REFT — Top reference decoupling |
| پین 8 | REFB — Bottom reference decoupling |
| پین 9 | AVDD — 5 V analog supply |
| پین 10 | GND — Analog ground |
| پین 11 | CLK+ — Differential clock positive input |
| پین 12 | CLK- — Differential clock negative input |
| پین 13 | CLKDIV — Clock divide control |
| پین 14 | RESET — Active-low reset |
| پین 15 | PD — Active-low power-down |
| پین 16 | OE — Output enable, active-high |
| پین 17 | DRVDD — 3.3 V digital driver supply |
| پین 18 | DRGND — Digital driver ground |
| پین 19 | D0+ — LVDS data output bit 0 positive |
| پین 20 | D0- — LVDS data output bit 0 negative |
| پین 21 | D1+ — LVDS data output bit 1 positive |
| پین 22 | D1- — LVDS data output bit 1 negative |
| پین 23 | D2+ — LVDS data output bit 2 positive |
| پین 24 | D2- — LVDS data output bit 2 negative |
| پین 25 | D3+ — LVDS data output bit 3 positive |
| پین 26 | D3- — LVDS data output bit 3 negative |
| پین 27 | D4+ — LVDS data output bit 4 positive |
| پین 28 | D4- — LVDS data output bit 4 negative |
| پین 29 | D5+ — LVDS data output bit 5 positive |
| پین 30 | D5- — LVDS data output bit 5 negative |
| پین 31 | D6+ — LVDS data output bit 6 positive |
| پین 32 | D6- — LVDS data output bit 6 negative |
| پین 33 | D7+ — LVDS data output bit 7 positive |
| پین 34 | D7- — LVDS data output bit 7 negative |
| پین 35 | D8+ — LVDS data output bit 8 positive |
| پین 36 | D8- — LVDS data output bit 8 negative |
| پین 37 | D9+ — LVDS data output bit 9 positive |
| پین 38 | D9- — LVDS data output bit 9 negative |
| پین 39 | D10+ — LVDS data output bit 10 positive |
| پین 40 | D10- — LVDS data output bit 10 negative |
| پین 41 | D11+ — LVDS data output bit 11 positive |
| پین 42 | D11- — LVDS data output bit 11 negative |
| پین 43 | D12+ — LVDS data output bit 12 positive |
| پین 44 | D12- — LVDS data output bit 12 negative |
| پین 45 | D13+ — LVDS data output bit 13 positive |
| پین 46 | D13- — LVDS data output bit 13 negative |
| پین 47 | D14+ — LVDS data output bit 14 positive |
| پین 48 | D14- — LVDS data output bit 14 negative |
| پین 49 | D15+ — LVDS data output bit 15 positive |
| پین 50 | D15- — LVDS data output bit 15 negative |
| پین 51 | CLKOUT+ — LVDS clock output positive |
| پین 52 | CLKOUT- — LVDS clock output negative |
| پین 53 | DRVDD — 3.3 V digital driver supply |
| پین 54 | DRGND — Digital driver ground |
| پین 55 | NC — Not connected (per datasheet) |
| پین 56 | NC — Not connected (per datasheet) |
| پین 57 | NC — Not connected (per datasheet) |
| پین 58 | NC — Not connected (per datasheet) |
| پین 59 | NC — Not connected (per datasheet) |
| پین 60 | AVDD — 5 V analog supply |
| پین 61 | GND — Analog ground |
| پین 62 | AVDD — 5 V analog supply |
| پین 63 | GND — Analog ground |
| پین 64 | EP — Exposed thermal pad, ground |
کاربردهای معمول
ADS5481IRGC25 مناسب است برای 6 کاربردs: Communications Receiver IF Sampling, Radar and Electronic Warfare Signal Processing, Test and Measurement Instrumentation, Medical Imaging Front End, Industrial Data Acquisition Systems, Software Defined Radio (SDR) Platform.
Communications Receiver IF Sampling
The ADS5481IRGC25 fits communications receiver IF-sampling designs because its 16-bit resolution at 80 MSPS captures narrowband signals with wide dynamic range, while the buffered analog input removes the kickback of switched-capacitor ADCs and tolerates higher source impedance from the anti-alias filter. Placed after the SAW or LC IF filter, the converter digitises the IF at 80 MSPS for digital down-conversion in an FPGA or DSP, replacing a multi-stage analog demodulator chain. Unlike unbuffered ADC inputs, the ADS5481's input buffer maintains SFDR at higher IF frequencies, enabling software-defined-radio architectures. With LVDS outputs, the digital interface remains low-EMI and easily routed across FR-4 to the host processor.
پیشنهادی
Radar and Electronic Warfare Signal Processing
The ADS5481IRGC25 is well matched to radar and electronic-warfare receivers because of its 16-bit resolution at 80 MSPS with high SFDR, which preserves the spurious-free window needed to detect small returns next to large clutter returns. In a typical radar front end, the buffered input accepts the IF signal directly from a log-amp or limiter output without an external buffer amplifier, simplifying the BOM. Compared to a 14-bit ADC running at the same rate, the additional 2 bits of resolution extend dynamic range by ~12 dB, which is critical in dense-target environments. The LVDS digital output keeps emissions low, important for co-located receiver and transmitter paths.
پیشنهادی
Test and Measurement Instrumentation
The ADS5481IRGC25 suits high-end oscilloscopes, spectrum analyzers, and arbitrary-waveform digitizers that demand 16-bit vertical resolution at high sample rates. Its buffered analog input allows direct connection to a wideband front-end attenuator and preamplifier chain, removing the need for a dedicated ADC driver and improving noise figure. In a digitizer card, the converter runs at 80 MSPS to oversample the input, which pushes quantisation noise below the instrument noise floor. Compared to 12-bit oscilloscope ADCs, the 16-bit ADS5481 delivers 16x more vertical codes, enabling wider dynamic range and lower harmonic distortion measurements in compliance-test applications.
پیشنهادی
Medical Imaging Front End
The ADS5481IRGC25 is used in medical-imaging systems such as ultrasound beamformers, CT scanners, and digital X-ray detector readouts where 16-bit dynamic range captures the full echo or attenuation range. The buffered input minimises distortion when driving the ADC from high-impedance transducer or photodiode preamp outputs, while 80 MSPS sample rate supports real-time imaging data rates. In an ultrasound system, multiple ADS5481 channels can be synchronised for parallel beamformer paths, all sharing a common clock to maintain phase coherence. Compared to 12-bit medical ADCs, the additional 4 bits of resolution increase the number of useful grayscale steps, improving diagnostic image quality.
پیشنهادی
Industrial Data Acquisition Systems
The ADS5481IRGC25 supports high-speed industrial data-acquisition systems that need 16-bit accuracy for vibration, acoustic, or strain-gauge digitisation. The buffered input works directly with piezoelectric sensors and instrumentation amplifiers, removing the load-induced distortion that plagues unbuffered switched-capacitor ADCs. With 80 MSPS, the converter easily oversamples 20 kHz mechanical vibration bands, allowing digital filtering and FFT analysis at the host. Compared to 14-bit industrial ADCs, the additional 2 bits lower the noise floor and improve spurious-free dynamic range, important for predictive-maintenance and condition-monitoring applications.
پیشنهادی
Software Defined Radio (SDR) Platform
The ADS5481IRGC25 enables wideband software-defined-radio platforms that digitise a swath of spectrum for digital channelisation in an FPGA. Its 80 MSPS sample rate covers up to 40 MHz of instantaneous bandwidth, while 16-bit resolution preserves modulation accuracy for sensitive waveforms such as QAM-1024 and LTE signals. The buffered analog input accepts the output of a wideband RF front end with minimal loading, preserving gain and phase response. Compared to a 12-bit SDR ADC, the 16-bit ADS5481 reduces quantisation noise by 16 dB, directly improving receiver sensitivity. The LVDS interface simplifies PCB routing to the host FPGA's LVDS receiver pins.
پیشنهادی
خلاصه محصولات پیشنهادی
داده‌های مرجع مهندسی برای ADS5481IRGC25 — مقایسه، راهنمای طراحی و اطلاعات انطباق.
راهنمای انتخاب
مقایسه با جایگزین‌ها
| پارامتر | این محصول | ADS5481IRGCR | ADS5482IRGC25 | ADS5483IRGC25 | ADS62P48IRGC25 |
|---|---|---|---|---|---|
| Package | 64-VQFN (RGC) 9x9 mm | 64-VQFN (RGC) 9x9 mm - same | 64-VQFN (RGC) 9x9 mm - same | 64-VQFN (RGC) 9x9 mm - same | 64-VQFN (RGC) 9x9 mm - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 16 bit | 16 bit | 16 bit | 16 bit | 14 bit |
| Sample Rate | 80 MSPS | 80 MSPS | 105 MSPS | 135 MSPS | 210 MSPS |
| Architecture | Pipelined | Pipelined | Pipelined | Pipelined | Pipelined |
| Input Type | Buffered Differential | Buffered Differential | Buffered Differential | Buffered Differential | Buffered Differential |
| Digital Output | LVDS | LVDS | LVDS | LVDS | LVDS |
| Analog Supply | 5 V | 5 V | 5 V | 5 V | 3.3 V |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
تفاوت‌های کلیدی
- Buffered analog input removes driver amplifier requirement (در مقابلADS62P48IRGC25)
- 16-bit resolution with 80 MSPS in same family footprint (در مقابلADS5483IRGC25)
- Industrial temperature range and proven TI supply continuity (در مقابلADS62P22IRGC25)
یادداشت‌های طراحی
Estimated: the ADS5481 draws approximately 600 mW from the 5 V analog supply and 200 mW from the 3.3 V digital supply at 80 MSPS. Place 0.1 uF X7R ceramic decoupling capacitors as close as possible to each AVDD and DRVDD pin, with a single 10 uF bulk tantalum or polymer capacitor near the analog supply entry point. Star-ground the analog and digital ground returns at the exposed thermal pad to prevent digital return currents from coupling into the analog input network.
Route the LVDS output pairs as 100 ohm differential microstrip lines on the top layer over a continuous ground plane, with intra-pair length matching of better than 150 mil and inter-pair length matching of better than 300 mil. Keep total length below 6 inches to preserve data-eye margin. Place the LVDS receiver pins on the FPGA within 4 inches of the ADC. The 80 MHz LVDS clock pair requires tighter matching (better than 50 mil) and should be isolated from the data pairs by at least 3W spacing.
Drive the ADC clock input with a low-jitter, differential source such as a dedicated clock jitter cleaner. According to the TI datasheet, the SNR degrades by approximately 1 dB for every 1 ps of RMS clock jitter at 80 MSPS. Use an LVDS or LVPECL driver, AC-couple the clock pair with 0.1 uF capacitors, and bias the inputs to the common-mode voltage specified in the datasheet. A poor clock source is the single most common cause of poor SNR in ADC system design.
Solder the exposed thermal pad (EP) to a continuous ground copper pour on the top layer, with at least 8 thermal vias (0.3 mm drill) connecting the top pad to an internal ground plane. Estimated: this arrangement keeps theta_JA near 28 C/W, allowing the 800 mW total dissipation to limit the junction-to-ambient temperature rise to approximately 22 C. In enclosed enclosures with limited airflow, derate the maximum ambient temperature by 10-15 C.
Avoid routing the analog input traces on the same layer as digital outputs or clock signals. The buffered analog input is high-impedance, so any capacitive coupling from the digital side can inject noise that appears as spurious content in the ADC output spectrum. Use a guard trace tied to analog ground on both sides of the analog input microstrip. Do not omit the VCM decoupling capacitor; it provides the reference for the common-mode output that biases the input driver stage.
اطلاعات انطباق
RoHS compliant per TI product page. The ADS5481IRGC25 is an industrial-grade part (not AEC-Q100 automotive); for automotive applications, contact TI for the appropriate Q1-grade part number.
