ADS6444IRGC25 - Quad 14-bit 105MSPS ADC, Serial LVDS | TI
MPN: ADS6444IRGC25 ✓ فعالADS6444IRGC25 نمای کلی
What is a pipelined ADC? A pipelined analog-to-digital converter is a high-speed data-converter architecture that uses multiple cascaded low-resolution stages to digitize an analog signal at sample rates from tens to hundreds of megasamples per second. Pipelined ADCs sit below flash converters in speed but above successive-approximation (SAR) converters, and dominate in communications infrastructure, medical imaging, and test-and-measurement applications where both high sampling rate and moderate-to-high resolution are required.
Key features include 4 differential analog inputs, simultaneous sampling of all four channels, programmable 1-wire or 2-wire LVDS serialization that minimizes board-routing congestion, internal reference with no external decoupling required, and an industry temperature grade of -40 C to +85 C. The integrated serialization stage reduces the digital pin count and simplifies FPGA capture, which is essential when routing hundreds of differential traces between the ADC and the downstream ASIC/FPGA.
Architecturally, each channel uses a switched-capacitor pipelined front end followed by digital error correction and a serializer block that emits LVDS-compatible data. The serialized data interface allows the device to present four channels of high-speed data over as few as four differential pairs instead of 56 CMOS parallel lines, drastically reducing FPGA pin count and PCB layer requirements.
Typical applications include base-station IF receivers, diversity receivers in multi-antenna systems, medical imaging front ends, and high-speed test and measurement equipment. In these systems the ADS6444IRGC25 typically digitizes intermediate-frequency signals at IF frequencies up to about 200 MHz while maintaining 14-bit resolution.
Designers should pay attention to the LVDS output timing budget and the layout of the four differential data pairs to the receiving FPGA. Maintain a solid ground plane under the exposed thermal pad, stitch vias around the perimeter of the pad for thermal relief, and route the analog inputs as 50-ohm controlled-impedance differential pairs to preserve SNR. This page synthesizes distributor pricing, drop-in same-family alternatives, and practical layout notes that go beyond the manufacturer datasheet.
جایگزین‌های drop-in برای ADS6444IRGC25 — 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 ADS6444IRGC25 (همان فرم‌فاکتور و فوت‌پرینت) — متفاوت در Package, Output Interface, Input Type, Number of Channels, Resolution.
ADS6445IRGC25
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←ADS6443IRGC25
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
ADS6442IRGC25
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
ADS6424IRGC25
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←ADS6425IRGC25
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←ADS62P23IRGC25
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←ADS6242IRGZR
✅ جایگزین مستقیم ⚠️ مشخصات تأییدنشدهبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←ADS6444IRGC25 حداکثر مقادیر مجاز و مشخصات الکتریکی
| رزولوشن | 14 bit |
| Number of Channels | 4 |
| Sample Rate | 105 MSPS |
| Architecture | Pipelined |
| Input Type | Differential |
| Analog Supply Voltage | 3.3 V |
| Digital Supply Voltage | 3.3 V |
| Output Interface | Serialized LVDS (1-wire or 2-wire) |
| بسته‌بندی | 64-VQFN (9x9 mm) with EP |
| دمای کاری | -40 C to +85 C (industrial) |
| Temperature Grade | Industrial |
| Terminal Form | No Lead |
| Package Code | HVQCCN (QFN) |
| نوع نصب | Surface Mount |
| وضعیت RoHS | Compliant |
| Family Compatibility | Pin-compatible with ADS6445/ADS6443/ADS6442 (same family) and ADS642x (12-bit) |
پیکربندی پین ADS6444IRGC25
| پین 1 | INP_A1 — Channel A1 positive analog input |
| پین 2 | INM_A1 — Channel A1 negative analog input |
| پین 3 | VCM_A1 — Channel A1 common-mode voltage |
| پین 4 | INP_A2 — Channel A2 positive analog input |
| پین 5 | INM_A2 — Channel A2 negative analog input |
| پین 6 | VCM_A2 — Channel A2 common-mode voltage |
| پین 7 | INP_B1 — Channel B1 positive analog input |
| پین 8 | INM_B1 — Channel B1 negative analog input |
| پین 9 | VCM_B1 — Channel B1 common-mode voltage |
| پین 10 | INP_B2 — Channel B2 positive analog input |
| پین 11 | INM_B2 — Channel B2 negative analog input |
| پین 12 | VCM_B2 — Channel B2 common-mode voltage |
| پین 13 | AGND — Analog ground |
| پین 14 | AVDD33 — Analog 3.3 V supply |
| پین 15 | REF — Internal reference output |
| پین 16 | REFT — Reference decoupling top |
| پین 17 | REFB — Reference decoupling bottom |
| پین 18 | AGND — Analog ground |
| پین 19 | AVDD33 — Analog 3.3 V supply |
| پین 20 | CLKP — Conversion clock positive input |
| پین 21 | CLKM — Conversion clock negative input |
| پین 22 | AGND — Analog ground |
| پین 23 | AVDD33 — Analog 3.3 V supply |
| پین 24 | RESET — Hardware reset, active low |
| پین 25 | PDN — Power-down, active high |
| پین 26 | SCLK — Serial programming clock |
| پین 27 | SDATA — Serial programming data |
| پین 28 | SEN — Serial programming enable |
| پین 29 | SDOUT — Serial programming readout |
| پین 30 | AGND — Analog ground |
| پین 31 | AVDD33 — Analog 3.3 V supply |
| پین 32 | AGND — Analog ground |
| پین 33 | DVDD33 — Digital 3.3 V supply |
| پین 34 | DGND — Digital ground |
| پین 35 | FCLK_P — Frame clock LVDS positive |
| پین 36 | FCLK_M — Frame clock LVDS negative |
| پین 37 | DCLK_P — Data clock LVDS positive |
| پین 38 | DCLK_M — Data clock LVDS negative |
| پین 39 | DA1_P — Channel A1 data LVDS positive |
| پین 40 | DA1_M — Channel A1 data LVDS negative |
| پین 41 | DA2_P — Channel A2 data LVDS positive |
| پین 42 | DA2_M — Channel A2 data LVDS negative |
| پین 43 | DB1_P — Channel B1 data LVDS positive |
| پین 44 | DB1_M — Channel B1 data LVDS negative |
| پین 45 | DB2_P — Channel B2 data LVDS positive |
| پین 46 | DB2_M — Channel B2 data LVDS negative |
| پین 47 | DVDD33 — Digital 3.3 V supply |
| پین 48 | DGND — Digital ground |
| پین 49 | DVDD33 — Digital 3.3 V supply |
| پین 50 | NC — Not connected (per datasheet) |
| پین 51 | NC — Not connected (per datasheet) |
| پین 52 | NC — Not connected (per datasheet) |
| پین 53 | NC — Not connected (per datasheet) |
| پین 54 | AVDD33 — Analog 3.3 V supply |
| پین 55 | AGND — Analog ground |
| پین 56 | AVDD33 — Analog 3.3 V supply |
| پین 57 | VCM — Common-mode voltage output |
| پین 58 | INT_EXT — Internal/external reference select |
| پین 59 | MODE — Serialization mode select (1-wire/2-wire) |
| پین 60 | AVDD33 — Analog 3.3 V supply |
| پین 61 | AGND — Analog ground |
| پین 62 | AVDD33 — Analog 3.3 V supply |
| پین 63 | AVDD33 — Analog 3.3 V supply |
| پین 64 | AGND — Analog ground |
کاربردهای معمول
ADS6444IRGC25 مناسب است برای 6 کاربردs: Base-Station IF Receiver, Diversity Receiver (Multi-Antenna), Medical Imaging Front End, Test and Measurement Instrumentation, Radar and Lidar Signal Capture, Software Defined Radio (SDR) Platforms.
Base-Station IF Receiver
The ADS6444IRGC25's four simultaneously-sampling 14-bit 105 MSPS channels and explicit listing for IF-sampling in the TI datasheet make it a strong fit for cellular base-station receivers that must digitize multiple antenna branches with phase coherence. Each channel captures a separate IF chain, so the FPGA only needs to perform digital downconversion and channelization rather than analog IF splitting with skew mismatch. The serialized LVDS interface keeps board routing manageable when four receive antennas are stacked behind the antenna front end. Compared with parallel-CMOS ADCs, the serialized output reduces FPGA pin count from ~56 CMOS lines per channel to one or two pairs, lowering both BOM cost and PCB layer count. Designers should allocate 50-ohm controlled-impedance routing for each analog input pair and decouple the 3.3 V rail close to the supply pins.
پیشنهادی
Diversity Receiver (Multi-Antenna)
Diversity receivers in MIMO systems rely on synchronized sampling of two or more antenna branches to combine signals coherently. The ADS6444IRGC25 samples four channels on the same edge of the same conversion clock, eliminating inter-channel skew and enabling maximal-ratio combining downstream. Each channel's 14-bit resolution preserves the signal-to-noise ratio needed for low-amplitude RF paths, while the 105 MSPS rate gives sufficient oversampling for IF frequencies up to about 200 MHz. The serialized LVDS output mode (1-wire or 2-wire programmable) lets the receiver stack 4 channels over only 8 LVDS pairs plus the frame clock, dramatically reducing FPGA I/O. Use the part's programmable full-scale range to match the LNA output level and maximize spurious-free dynamic range.
پیشنهادی
Medical Imaging Front End
In ultrasound and other medical imaging front ends, multiple analog receive channels must be digitized in lockstep with fine amplitude resolution to reconstruct tissue images accurately. The ADS6444IRGC25 provides four 14-bit simultaneously-sampled channels that match the four-channel transducer beamformer topology common in portable ultrasound carts. Its 14-bit resolution at 105 MSPS captures the dynamic range needed for both strong and weak echo returns, and its serialized LVDS interface keeps the cable harness between the probe head electronics and the cart base manageable. The 3.3 V single-supply operation simplifies the medical-grade isolation barrier, and the industrial -40 C to +85 C temperature grade supports cart-grade thermal environments. Decoupling must follow TI's recommended 0.1 uF plus 10 uF bulk pattern, and the exposed pad must be thermally grounded for continuous imaging duty cycles.
پیشنهادی
Test and Measurement Instrumentation
High-end oscilloscopes, spectrum analyzers, and arbitrary-waveform-digitizer cards all require multi-channel 14-bit ADCs with synchronized sampling. The ADS6444IRGC25's four-channel architecture suits a 4-channel bench instrument that needs to capture four signals simultaneously at 100+ MSPS, while its serialized LVDS output allows the data to be forwarded to a high-end FPGA for trigger logic and deep-memory buffering. Each channel's spurious-free dynamic range is sufficient for clean spectral measurements of moderate-bandwidth signals, and the internal reference (no external decoupling needed) simplifies the analog front end. Designers should bias the analog inputs at mid-supply and follow TI's recommended anti-alias filter topology before the ADC inputs.
پیشنهادی
Radar and Lidar Signal Capture
Phased-array radar and lidar receivers digitize multiple receive channels at IF, and the ADS6444IRGC25's four-channel architecture maps directly onto a 4-element sub-array. The 14-bit resolution preserves dynamic range for both close-in strong returns and far-field weak returns, while the 105 MSPS rate is adequate for IF bandwidths up to roughly 40 MHz. The serialized LVDS output simplifies routing inside a dense radar enclosure, where parallel-CMOS buses would force many PCB layers. Designers should pair the ADC with a low-jitter clock distribution network so that the conversion clock meets the datasheet aperture-jitter specification, and should synchronize the four channels to a single low-noise clock source to preserve beamforming accuracy.
پیشنهادی
Software Defined Radio (SDR) Platforms
Software defined radio cards digitize wide-bandwidth IF signals and rely on multi-channel synchronized ADCs to support multi-stream reception. The ADS6444IRGC25 provides four 14-bit 105 MSPS channels that are well matched to common SDR daughter-card architectures, and its serialized LVDS output is compatible with many SDR FPGA reference designs. The pin-compatibility with the 12-bit ADS642x family gives SDR designers a clear upgrade/downgrade path for cost versus dynamic range trade-offs. Decoupling and PCB layout should follow the TI ADS644x reference design, and the exposed thermal pad must be soldered to a continuous ground plane for sustained sample-rate operation.
پیشنهادی
خلاصه محصولات پیشنهادی
داده‌های مرجع مهندسی برای ADS6444IRGC25 — مقایسه، راهنمای طراحی و اطلاعات انطباق.
راهنمای انتخاب
مقایسه با جایگزین‌ها
| پارامتر | این محصول | ADS6445IRGC25 | ADS6443IRGC25 | ADS6442IRGC25 | ADS6424IRGC25 |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 64-VQFN (9x9) with EP | 64-VQFN (9x9) - same | 64-VQFN (9x9) - same | 64-VQFN (9x9) - same | 64-VQFN (9x9) - same |
| Sample Rate | 105 MSPS | 125 MSPS | 80 MSPS | 65 MSPS | 105 MSPS |
| Resolution | 14 bit | 14 bit | 14 bit | 14 bit | 12 bit |
| Number of Channels | 4 | 4 | 4 | 4 | 4 |
| Output Interface | Serialized LVDS (1/2-wire) | Serialized LVDS (1/2-wire) | Serialized LVDS (1/2-wire) | Serialized LVDS (1/2-wire) | Serialized LVDS (1/2-wire) |
| Analog Supply Voltage | 3.3 V | 3.3 V | 3.3 V | 3.3 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
- Pin-compatible speed-grade roadmap (در مقابلADS6442IRGC25)
- Family compatibility with 12-bit ADS642x (در مقابلADS6424IRGC25)
- Serialized LVDS reduces FPGA pin count (در مقابلADS62P23IRGC25)
- Higher sample rate than dual-channel family (در مقابلADS6242IRGZR)
یادداشت‌های طراحی
Route all four differential analog input pairs as 50-ohm controlled-impedance traces, length-matched to within about 0.5 mm to preserve channel-to-channel phase coherence. Place the input RC anti-alias filter within 5 mm of each input pin to avoid reflections that would degrade SNR at high IF frequencies. The exposed thermal pad must be soldered to a continuous ground plane and stitched with at least nine thermal vias (0.3 mm drill, 0.6 mm pitch) for the datasheet thermal resistance to be valid.
Use separate analog and digital 3.3 V rails, joined at a single point near the ADC. Place 0.1 uF X7R ceramic capacitors within 3 mm of each AVDD33 and DVDD33 pin, and add a single 10 uF bulk capacitor per rail near the device. The internal reference does not require external decoupling capacitors, but a small 0.1 uF on REFT/REFB improves low-frequency PSRR. Decouple the LVDS output supply through a ferrite bead to prevent digital switching noise from coupling back into the analog front end.
Drive the CLKP/CLKM input with a low-jitter differential clock source (jitter below 1 ps RMS) to avoid degrading SNR at high IF frequencies; aperture jitter of the ADC scales directly with SNR loss as SNR(dB) = 20*log10(1/(2*pi*fIN*jitter)). Match the four LVDS data pair lengths to the FPGA to within about 2 mm so the FPGA's LVDS receiver can capture them reliably. Maintain a solid reference plane under all LVDS pairs and avoid routing them across split planes.
Do not float the MODE pin - the 1-wire vs 2-wire serialization mode is selected at power-up and must be tied to AVDD33 or DGND through a 1 kohm resistor. Ensure the RESET pin is pulled high through a 10 kohm resistor and only pulled low for at least one conversion clock cycle for a clean reset. Avoid leaving any NC pins floating; tie them to ground per the datasheet recommendation. When migrating to ADS6445 (125 MSPS), verify the FPGA capture fabric supports the higher LVDS bit rate before committing to the BOM.
اطلاعات انطباق
Industrial temperature grade. RoHS compliant per TI product page. Not AEC-Q100 qualified - choose ADS6444Q variant if automotive grade is required.
