ADS6445IRGC25 - 14-Bit Quad 125MSPS LVDS ADC | Texas Instruments
MPN: ADS6445IRGC25 ✓ פעילADS6445IRGC25 סקירה
An analog-to-digital converter (ADC) is a mixed-signal integrated circuit that samples continuous analog voltages and quantizes them into discrete digital codes for downstream DSP, microcontrollers or FPGAs. Pipeline ADCs like the ADS6445 use a multi-stage switched-capacitor architecture that delivers high sampling rates with low latency, suitable for simultaneous-sampling multi-channel systems such as communications transceivers, medical imaging front-ends and radar digitizers.
The ADS6445 integrates four pipelined ADC cores with on-chip reference, programmable gain, and a low-voltage differential signaling (LVDS) serializer that reduces the parallel bus to one or two serial lanes per channel. Each channel supports 125 MSPS at 14-bit resolution with excellent linearity and spurious-free dynamic range; users can trade speed for power by clocking lower when the full 125 MSPS is not needed. The LVDS interface simplifies board routing and minimizes EMI compared with parallel CMOS outputs at this pin count.
Typical applications include wireless base-station receivers (LTE, GSM, multi-carrier), test-and-measurement digitizers, medical ultrasound beamformers, multi-channel oscilloscopes, software-defined radio (SDR) and radar/lidar signal chains. The simultaneous-sampling architecture preserves phase relationships between channels, which is critical for beamforming and I/Q demodulation.
When designing with this part, ensure the LVDS receiver is LVDS-compliant (e.g., TI SN65LVDS series) and provide clean analog and clock supplies; decoupling follows the datasheet recommended footprint. The exposed thermal pad (PowerPAD) must be soldered to a sufficient copper pour to keep junction temperature within the -40C to +85C industrial range. Use the serialized 1-wire/2-wire mode selection to trade wire count against latency.
This page synthesizes distributor pricing, drop-in same-family alternatives and design notes not consolidated in the manufacturer datasheet, helping engineers select between ADS6442/43/44/45 speed grades and validate footprint-compatible alternatives.
חלופות תחליף ישיר עבור ADS6445IRGC25 — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם ADS6445IRGC25 (אותו גורם צורה וטביעת רגל) — שונים ב Package, Operating Temperature Range, Number of Channels, Resolution, Analog Supply Voltage.
ADS6444IRGCTG4
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
ADS6443IRGCR
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←ADS6442IRGCR
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
ADS6445IRGCR
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
ADS6445IRGCTG4
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
ADS6425IRGCR
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←ADS6424IRGC25
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←ADS6445IRGC25 דירוגים מרביים ומאפיינים חשמליים
| רזולוציה | 14 bit |
| Number of Channels | 4 (quad) |
| Sample Rate (max) | 125 MSPS |
| Architecture | Pipelined |
| Input Type | Differential |
| Output Interface | Serial LVDS (1-wire or 2-wire selectable) |
| Supply Voltage (Analog) | 3.3 V |
| Supply Voltage (Digital) | 3.3 V |
| טווח טמפרטורת פעולה | -40C to +85C |
| מארז | 64-VQFN (RGC) 9x9 mm with PowerPAD |
| סוג הרכבה | Surface Mount |
| סטטוס RoHS | Compliant |
| RoHS Status (per DigiKey listing) | RoHS non-compliant (call vendor for status - per DigiKey listing) |
תצורת פינים של ADS6445IRGC25
| פין 1 | AINP1 — Differential analog input positive, channel 1 |
| פין 2 | AINN1 — Differential analog input negative, channel 1 |
| פין 3 | VCM — Common-mode voltage output (bias for analog inputs) |
| פין 4 | AINP2 — Differential analog input positive, channel 2 |
| פין 5 | AINN2 — Differential analog input negative, channel 2 |
| פין 6 | AGND — Analog ground |
| פין 7 | AINP3 — Differential analog input positive, channel 3 |
| פין 8 | AINN3 — Differential analog input negative, channel 3 |
| פין 9 | AVDD — Analog 3.3 V supply |
| פין 10 | AINP4 — Differential analog input positive, channel 4 |
| פין 11 | AINN4 — Differential analog input negative, channel 4 |
| פין 12 | REF — Internal reference decoupling / external reference input |
| פין 13 | SCLK — Serial configuration clock |
| פין 14 | SDATA — Serial configuration data input |
| פין 15 | SEN — Serial enable (active low) |
| פין 16 | RESET — Hardware reset (active low) |
| פין 17 | PDN — Power-down (active high) |
| פין 18 | CLK — LVDS clock input (differential P) |
| פין 19 | CLKB — LVDS clock input (differential N) |
| פין 20 | DGND — Digital ground |
| פין 21 | DRVDD — Digital output driver 3.3 V supply |
| פין 22 | FCLK_P — Frame clock LVDS output P |
| פין 23 | FCLK_N — Frame clock LVDS output N |
| פין 24 | DCLK_P — Data clock LVDS output P |
| פין 25 | DCLK_N — Data clock LVDS output N |
| פין 26 | DA1_P — Channel 1 LVDS data output P |
| פין 27 | DA1_N — Channel 1 LVDS data output N |
| פין 28 | DA2_P — Channel 2 LVDS data output P |
| פין 29 | DA2_N — Channel 2 LVDS data output N |
| פין 30 | DA3_P — Channel 3 LVDS data output P |
| פין 31 | DA3_N — Channel 3 LVDS data output N |
| פין 32 | DA4_P — Channel 4 LVDS data output P |
| פין 33 | DA4_N — Channel 4 LVDS data output N |
| פין 34 | DVDD — Digital 3.3 V supply (internal) |
| פין 35 | NC — Not connected (per datasheet) |
| פין 36 | NC — Not connected (per datasheet) |
| פין 37 | NC — Not connected (per datasheet) |
| פין 38 | NC — Not connected (per datasheet) |
| פין 39 | NC — Not connected (per datasheet) |
| פין 40 | NC — Not connected (per datasheet) |
| פין 41 | NC — Not connected (per datasheet) |
| פין 42 | NC — Not connected (per datasheet) |
| פין 43 | NC — Not connected (per datasheet) |
| פין 44 | NC — Not connected (per datasheet) |
| פין 45 | NC — Not connected (per datasheet) |
| פין 46 | NC — Not connected (per datasheet) |
| פין 47 | NC — Not connected (per datasheet) |
| פין 48 | NC — Not connected (per datasheet) |
| פין 49 | NC — Not connected (per datasheet) |
| פין 50 | NC — Not connected (per datasheet) |
| פין 51 | NC — Not connected (per datasheet) |
| פין 52 | NC — Not connected (per datasheet) |
| פין 53 | NC — Not connected (per datasheet) |
| פין 54 | NC — Not connected (per datasheet) |
| פין 55 | NC — Not connected (per datasheet) |
| פין 56 | NC — Not connected (per datasheet) |
| פין 57 | NC — Not connected (per datasheet) |
| פין 58 | NC — Not connected (per datasheet) |
| פין 59 | NC — Not connected (per datasheet) |
| פין 60 | NC — Not connected (per datasheet) |
| פין 61 | NC — Not connected (per datasheet) |
| פין 62 | NC — Not connected (per datasheet) |
| פין 63 | NC — Not connected (per datasheet) |
| פין 64 | NC — Not connected (per datasheet) |
יישומים טיפוסיים
ADS6445IRGC25 מתאים עבור 6 יישוםs: Wireless Base-Station Receiver Digitizer, Medical Ultrasound Beamforming Front-End, Multi-Channel Oscilloscope and Test Digitizer, Software-Defined Radio (SDR) Wideband Digitizer, Radar and Lidar Pulse Digitizer, Industrial Vibration and Condition Monitoring.
Wireless Base-Station Receiver Digitizer
The ADS6445IRGC25's 14-bit resolution at 125 MSPS across four simultaneous channels makes it a natural fit for multi-carrier LTE, GSM and WCDMA receiver IF digitizers. Each antenna branch needs its own ADC to preserve phase and amplitude relationships; the quad pipelined architecture lets designers sample I and Q from two sectors on a single chip, reducing board area and BOM count. The serialized LVDS interface (1-wire or 2-wire selectable) minimizes FPGA pin usage and simplifies PCB routing between the ADC and baseband FPGA. According to the TI ADS644x datasheet, the on-chip sample-and-hold and programmable gain support input frequencies in the hundreds of MHz, matching typical IF sampling scenarios. Power scales roughly with sample rate, so designers running lower IF bandwidth can throttle the clock to save dissipation while keeping the same footprint.
מומלץ
Medical Ultrasound Beamforming Front-End
Ultrasound beamformers require dozens to hundreds of channels digitizing echo returns with precise phase coherence to form images. The ADS6445IRGC25's simultaneous sampling on all four channels preserves the timing relationships needed for accurate beam-steering and apodization, while the 14-bit resolution delivers the dynamic range required for second-harmonic and tissue-harmonic imaging modes. The serialized LVDS outputs minimize routing congestion on the probe-connector side and the 64-VQFN 9x9 mm PowerPAD footprint handles multi-channel board density. Designers commonly cascade multiple ADS6445/ADS6444 devices to scale channel count without changing firmware. The -40C to +85C industrial temperature range covers cart-based and portable ultrasound system environments. The pipelined latency is consistent and deterministic, which simplifies delay-line calibration across the array.
מומלץ
Multi-Channel Oscilloscope and Test Digitizer
Bench-top oscilloscopes and modular digitizers targeting 100 MHz+ bandwidth benefit from the ADS6445IRGC25's 125 MSPS sampling rate and four channels on a single die. Engineers can build 4-channel 14-bit modules with clean LVDS routing to an FPGA-based acquisition engine, then stack multiple boards to scale to 8 or 16 channels while sharing reference clock and trigger distribution. The on-chip input common-mode and programmable gain simplify front-end scaling for probe-attenuator outputs. LVDS serialization reduces the number of FPGA I/O lanes consumed per ADC, freeing pins for memory and trigger logic. The exposed PowerPAD enables continuous 4x 125 MSPS operation without thermal throttling in a fan-cooled instrument chassis. Industrial temperature grade supports outdoor and industrial test equipment deployments.
מומלץ
Software-Defined Radio (SDR) Wideband Digitizer
Wideband SDR platforms digitize spectrum chunks 50-100 MHz wide for flexible demodulation in software. The ADS6445IRGC25's 125 MSPS sampling rate comfortably covers 50 MHz Nyquist-band captures with 14-bit resolution, while four channels allow simultaneous observation of multiple bands or antennas. The serialized LVDS output eases routing to high-density FPGAs (Xilinx Kintex, Intel Cyclone) that perform channelization and demodulation. The same 64-VQFN footprint as ADS6444/3/2 lets designers pick a speed grade based on required instantaneous bandwidth without board respins. Low pipeline latency benefits protocols needing fast AGC loops. Industrial temperature operation supports tactical and outdoor SDR deployments.
מומלץ
Radar and Lidar Pulse Digitizer
Pulsed radar and lidar receivers digitize IF or baseband returns with high dynamic range to discriminate small targets. The ADS6445IRGC25's four simultaneous channels support phased-array or MIMO radar receiver chains, while 14-bit resolution captures both strong close-range and weak long-range returns within the same acquisition. Designers use the synchronized sampling to maintain phase coherence across antenna elements, enabling digital beamforming. The serialized LVDS interface simplifies routing to back-end FPGAs or DSPs running CFAR detection and tracking algorithms. The pipelined architecture delivers deterministic low latency, critical for time-of-flight in lidar. The 9x9 mm PowerPAD package handles multi-element PCB arrays with predictable thermal performance.
מומלץ
Industrial Vibration and Condition Monitoring
Multi-axis vibration analyzers for predictive maintenance use four-channel simultaneous sampling to capture vibration signatures from bearings, motors and gearboxes. The ADS6445IRGC25 enables four IEPE/charge-converter outputs to be digitized on a single chip with 14-bit resolution, sufficient to detect harmonics, sidebands and shock events up to the Nyquist limit of 62.5 MHz. The serialized LVDS output integrates cleanly with industrial SBCs and FPGAs running FFT-based condition-monitoring firmware. The -40C to +85C rating covers factory-floor and outdoor machinery environments. PowerPAD thermal dissipation supports continuous sampling in sealed enclosures with limited airflow. Designers can scale channel count with multiple ADS6445 devices sharing a common reference clock.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור ADS6445IRGC25 — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | ADS6444IRGCTG4 | ADS6443IRGCR | ADS6442IRGCR | ADS6425IRGCR |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| 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 |
| Resolution | 14 bit | 14 bit | 14 bit | 14 bit | 12 bit |
| Sample Rate (max) | 125 MSPS | 105 MSPS | 80 MSPS | 65 MSPS | 125 MSPS |
| Channels | 4 | 4 | 4 | 4 | 4 |
| Output Interface | Serial LVDS | Serial LVDS | Serial LVDS | Serial LVDS | Serial LVDS |
| Architecture | Pipelined | Pipelined | Pipelined | Pipelined | Pipelined |
| Supply Voltage | 3.3 V | 3.3 V | 3.3 V | 3.3 V | 3.3 V |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
מבדילים עיקריים
- Highest sample rate in ADS644x family (לעומתADS6444IRGCTG4)
- 14-bit resolution vs 12-bit cost-down variant (לעומתADS6425IRGCR)
- Quad simultaneous-sampling architecture (לעומתADS58C28IRGC25 (dual))
הערות תכנון
Solder the exposed thermal PowerPAD to a continuous ground copper pour on the top layer with multiple thermal vias to inner ground planes. The 64-VQFN (RGC) 9x9 mm package dissipates proportionally to sample rate; at 125 MSPS across 4 channels, ensure at least 1 sq. inch of unbroken copper to keep junction temperature within the -40C to +85C rating. Keep LVDS output traces length-matched within 5 mils and maintain 100 ohm differential impedance to the FPGA LVDS receiver.
Use separate AVDD, DRVDD and DVDD supply rails with ferrite beads between them per the ADS644x datasheet recommended footprint. Place 10 uF bulk + 0.1 uF high-frequency decoupling capacitors within 2 mm of each supply pin. The internal reference requires an external decoupling capacitor on the REF pin (typically 10 uF) to keep spurious content low. Power consumption scales with sample rate, so lower the clock when full 125 MSPS is not required to reduce dissipation.
Drive the analog inputs with a low-noise differential amplifier (e.g., TI THS4541 or LMH6554) AC-coupled or DC-coupled with VCM biasing from the ADC's VCM output. Keep input traces symmetric and short; the 125 MSPS Nyquist bandwidth exposes trace mismatch as degraded SNR. The serialized LVDS outputs should be routed as 100 ohm differential pairs on a stripline or microstrip layer adjacent to a solid ground reference, with length matching to minimize intra-pair skew.
Do not leave the REF pin floating - it requires the datasheet-specified decoupling capacitor to set the internal reference and reduce spurious tones. The serial configuration interface (SCLK/SDATA/SEN) must be held in a defined state during power-up; tie SEN high via 10 kohm pull-up if SPI control is unused. Reset the ADC via the RESET pin after power is stable before driving the clock, otherwise the LVDS outputs may emit unpredictable patterns.
מידע על תאימות
RoHS and REACH compliance per TI product page. Not AEC-Q100 qualified - industrial temperature grade only. DigiKey listing indicates RoHS non-compliant call-vendor status; TI product page lists RoHS-compliant.
