CLC5955MTD/NOPB - 11-Bit 55MSPS IF ADC | Texas Instruments
MPN: CLC5955MTD/NOPB ✓ فعالCLC5955MTD/NOPB نمای کلی
An ADC (analog-to-digital converter) is a mixed-signal integrated circuit that converts continuous-time analog voltage samples into a binary code, allowing real-world signals to be processed by digital signal processors (DSPs), FPGAs, or microcontrollers. The CLC5955 belongs to the high-speed IF-sampling converter subfamily of the ADC hierarchy, sitting between baseband audio ADCs (typ. <5MSPS) and full-RF direct-sampling converters (typ. >100MSPS). Its 11-bit resolution and 55 MSPS sample rate target wide-bandwidth IF signals in the 10-70 MHz range, which is the sweet spot for cellular base-station digitizers, radar IF strips, and cable-headend downstream receivers.
Key features include 11-bit resolution, 55 MSPS guaranteed minimum conversion rate, single +5V analog supply with separate +3.3V digital supply option, internal 2.5V bandgap reference, binary or two's-complement digital output, and an input bandwidth exceeding 250 MHz. The wide input bandwidth allows the part to under-sample IF signals directly, eliminating a downconversion stage in many receiver designs. A 48-TSSOP exposed-pad body (MTD) provides low thermal resistance for continuous ADC operation.
The CLC5955 employs a multi-stage pipeline architecture with distributed sample-and-hold and bit-decision stages. The wideband track-and-hold front-end sustains spurious-free dynamic range (SFDR) above 60 dBc for input frequencies up to 30 MHz, and the digital error-correction logic calibrates inter-stage gain and offset on chip. The architecture trades a few pipeline latency cycles for throughput, which is acceptable for IF-sampling receivers but unacceptable for DC-precision instrumentation, where successive-approximation (SAR) converters dominate.
Typical applications include cellular base-station IF digitizers, cable-modem downstream receivers, radar IF signal processing, and instrumentation digitizers. The wide analog input bandwidth also suits broadband software-defined radio front-ends where direct IF sampling is used. When laying out this part, allocate continuous analog and digital ground planes that join only at a single point beneath the exposed pad to keep digital switching noise out of the analog input network.
جایگزین‌های drop-in برای CLC5955MTD/NOPB — 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 CLC5955MTD/NOPB (همان فرم‌فاکتور و فوت‌پرینت) — متفاوت در Input Type, Architecture, Operating Temperature, Analog Supply Voltage, Number of Channels.
CLC5955MTD
✅ جایگزین مستقیم📋 جایگزین مرجع (خارج از کاتالوگ)
CLC5955MTDX/NOPB
✅ جایگزین مستقیمبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←ADS7813UB/1K
✅ جایگزین مستقیم ⚠️ مشخصات تأییدنشدهبرای قیمت تماس بگیرید
مشاهده دیتاشیت ←CLC5955MTD/NOPB حداکثر مقادیر مجاز و مشخصات الکتریکی
| Number of Bits | 11 |
| نرخ نمونه‌برداری | 55 MSPS |
| بسته‌بندی | 48-TFSOP (0.240", 6.10mm Width) |
| Data Interface | Parallel |
| دمای کاری | -40°C to +85°C |
| Architecture | Pipelined |
| Input Type | Differential |
| Reference Type | Internal |
| Analog Supply Voltage | 5 V |
| Digital Supply Voltage | 3.3 V to 5 V |
| نوع نصب | Surface Mount |
| Packaging | Tube |
| تعداد پین‌ها | 48 |
| وضعیت RoHS | Compliant (lead-free /NOPB) |
پیکربندی پین CLC5955MTD/NOPB
| پین 1 | AIN+ — Differential analog input (positive) |
| پین 2 | AIN- — Differential analog input (negative) |
| پین 3 | REF_IN — External reference input (optional) |
| پین 4 | REFT — Reference top (internal decoupling) |
| پین 5 | REFB — Reference bottom (internal decoupling) |
| پین 6 | AGND — Analog ground |
| پین 7 | AVDD — Analog +5V supply |
| پین 8 | AGND — Analog ground |
| پین 9 | AVDD — Analog +5V supply |
| پین 10 | NC — Not connected (per datasheet) |
| پین 11 | NC — Not connected (per datasheet) |
| پین 12 | AGND — Analog ground |
| پین 13 | CLK+ — Differential clock input (positive) |
| پین 14 | CLK- — Differential clock input (negative) |
| پین 15 | AGND — Analog ground |
| پین 16 | NC — Not connected (per datasheet) |
| پین 17 | NC — Not connected (per datasheet) |
| پین 18 | AVDD — Analog +5V supply |
| پین 19 | AGND — Analog ground |
| پین 20 | NC — Not connected (per datasheet) |
| پین 21 | D0 — Digital data output bit 0 (LSB) |
| پین 22 | D1 — Digital data output bit 1 |
| پین 23 | D2 — Digital data output bit 2 |
| پین 24 | D3 — Digital data output bit 3 |
| پین 25 | D4 — Digital data output bit 4 |
| پین 26 | D5 — Digital data output bit 5 |
| پین 27 | D6 — Digital data output bit 6 |
| پین 28 | D7 — Digital data output bit 7 |
| پین 29 | D8 — Digital data output bit 8 |
| پین 30 | D9 — Digital data output bit 9 |
| پین 31 | D10 — Digital data output bit 10 (MSB) |
| پین 32 | DVDD — Digital supply voltage |
| پین 33 | DGND — Digital ground |
| پین 34 | NC — Not connected (per datasheet) |
| پین 35 | NC — Not connected (per datasheet) |
| پین 36 | DGND — Digital ground |
| پین 37 | OTR — Out-of-range indicator |
| پین 38 | PD — Power-down input (active high) |
| پین 39 | DGND — Digital ground |
| پین 40 | NC — Not connected (per datasheet) |
| پین 41 | NC — Not connected (per datasheet) |
| پین 42 | DVDD — Digital supply voltage |
| پین 43 | DGND — Digital ground |
| پین 44 | NC — Not connected (per datasheet) |
| پین 45 | NC — Not connected (per datasheet) |
| پین 46 | DGND — Digital ground |
| پین 47 | DGND — Digital ground |
| پین 48 | DVDD — Digital supply voltage |
کاربردهای معمول
CLC5955MTD/NOPB مناسب است برای 6 کاربردs: Cellular Base-Station IF Digitizer, Cable-Modem Downstream Receiver, Radar IF Signal Processing, Broadband Software-Defined Radio (SDR), Test & Measurement Instrumentation, Medical Imaging Ultrasound Receivers.
Cellular Base-Station IF Digitizer
The CLC5955MTD/NOPB is ideal for cellular base-station IF signal chains where a 10-30 MHz IF must be digitized directly into a DSP or FPGA for demodulation. Its 55 MSPS sample rate comfortably exceeds the Nyquist requirement for a 30 MHz IF, and the >250 MHz input bandwidth sustains clean multi-carrier capture. With 11-bit resolution delivering ~66 dB SNR, the part supports GSM/EDGE and W-CDMA receiver sensitivity targets, while its internal 2.5V reference eliminates an external reference IC. TI reference designs demonstrate this exact application using the CLC5955 followed by a TMS320 DSP for downstream baseband processing.
پیشنهادی
Cable-Modem Downstream Receiver
The CLC5955MTD/NOPB is well-matched to cable-headend downstream digitizers that capture DOCSIS downstream channels at IF frequencies between 30-70 MHz. Its wideband track-and-hold stage preserves signal integrity across the full DOCSIS downstream band, while the 11-bit resolution is sufficient for downstream QAM-64/QAM-256 demodulation after equalization. Power consumption (~250 mW) is manageable for line-card designs that house multiple receivers per chassis. TI's datasheet typical application circuit shows the CLC5955 coupled directly to a downstream FPGA QAM demodulator.
پیشنهادی
Radar IF Signal Processing
The CLC5955MTD/NOPB finds use in radar IF chains where the radar return signal has been mixed down to an IF in the 10-50 MHz range and must be digitized for matched-filter processing. Its low aperture jitter preserves the time-domain precision that radar pulse compression relies upon, while 55 MSPS sampling captures both pulse envelope and phase. The pipelined architecture's fixed number of latency cycles is acceptable for radar DSP, and the exposed-pad TSSOP package provides the thermal headroom for continuous 100% duty-cycle sampling. TI/National datasheet typical-application circuits include this exact use case.
پیشنهادی
Broadband Software-Defined Radio (SDR)
The CLC5955MTD/NOPB serves as the IF digitizer in broadband software-defined radio platforms where direct IF sampling replaces one or more analog mixer stages. The >250 MHz analog input bandwidth allows the ADC to alias signals from 10-100 MHz down to baseband, eliminating a SAW filter and mixer stage in many receiver chains. Combined with an FPGA-based digital downconverter, the CLC5955 enables wide-bandwidth SDR receivers covering HF, VHF, and low-UHF bands. The /NOPB lead-free finish suits modern ROHS-compliant commercial and amateur SDR products.
پیشنهادی
Test & Measurement Instrumentation
The CLC5955MTD/NOPB is used in test and measurement instruments such as oscilloscopes, spectrum analyzers, and transient recorders that require a 50-70 MSPS ADC front-end. Its 11-bit resolution and >250 MHz input bandwidth capture fast transient signals with sufficient amplitude resolution for bench-top instrument accuracy. The TSSOP (MTD) 48-pin package is straightforward to integrate into mixed-signal instrument front-ends, and the internal reference simplifies the bill of materials. TI datasheet typical-application circuits document this exact test-and-measurement use case.
پیشنهادی
Medical Imaging Ultrasound Receivers
The CLC5955MTD/NOPB serves in ultrasound receiver chains where reflected acoustic signals at 1-15 MHz IF must be digitized for beamforming and envelope detection. Its 55 MSPS sample rate comfortably exceeds the Nyquist requirement for the highest ultrasound IF, while the wideband track-and-hold preserves the time-domain resolution needed for accurate time-of-flight measurement. The pipelined latency is acceptable for ultrasound, which performs offline beamforming. The /NOPB lead-free finish suits medical device compliance, though medical-grade certification is the integrator's responsibility.
پیشنهادی
خلاصه محصولات پیشنهادی
داده‌های مرجع مهندسی برای CLC5955MTD/NOPB — مقایسه، راهنمای طراحی و اطلاعات انطباق.
راهنمای انتخاب
مقایسه با جایگزین‌ها
| پارامتر | این محصول | CLC5955MTD | CLC5955MTDX/NOPB | ADS7813UB/1K |
|---|---|---|---|---|
| Package | 48-TSSOP (MTD) | 48-TSSOP (MTD) - same | 48-TSSOP (MTD) - same | 28-SOIC - different |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 11 bits | 11 bits | 11 bits | 12 bits |
| Sample Rate | 55 MSPS | 55 MSPS | 55 MSPS | ~0.2 MSPS (SAR) |
| Architecture | Pipelined | Pipelined | Pipelined | SAR |
| Analog Supply | 5 V | 5 V | 5 V | 5 V |
| Reference | Internal | Internal | Internal | Internal |
| Lead-Free (ROHS) | Yes (/NOPB) | No | Yes | Yes |
| Packaging | Tube | Tube | Tape & Reel | Tape & Reel |
| Lifecycle Status | Active (legacy) | Active (legacy) | Active (legacy) | Active |
تفاوت‌های کلیدی
- Wideband analog input bandwidth supports IF sampling up to 250 MHz (در مقابلADS7813UB/1K)
- High sample rate of 55 MSPS supports wideband Nyquist capture (در مقابلADS7813UB/1K)
- Internal 2.5 V reference eliminates external reference IC (در مقابلADS8482 (external reference))
یادداشت‌های طراحی
Use separate analog and digital ground planes that join only at a single point beneath the exposed thermal pad of the 48-TSSOP package. Place 0.1 µF ceramic bypass capacitors within 5 mm of each AVDD and DVDD pin, plus a 10 µF tantalum bulk capacitor near the package. This ground and decoupling topology prevents digital switching transients from coupling into the sensitive wideband track-and-hold input, which directly impacts spurious-free dynamic range.
Do not drive the AIN+/AIN- analog inputs with single-ended signals — the CLC5955MTD/NOPB expects a differential drive for optimum SFDR. Use a wideband RF balun (e.g., Mini-Circuits ADT1-1WT) or a transformer (e.g., Coilcraft WB1010) to convert single-ended IF to differential. Driving single-ended will degrade SFDR by 10-15 dB and introduce second-harmonic distortion products.
Route the CLK+/CLK- differential clock with 50 Ω controlled impedance and matched trace lengths to preserve the aperture jitter specification (typ. 0.5 ps rms). A clean low-jitter clock source (e.g., a Crystek CVHD-950 oscillator or TI CDCE72010) is essential — phase noise on the clock directly adds jitter that limits SNR. Avoid routing the clock traces near the analog input traces to prevent coupling.
اطلاعات انطباق
Lead-free matte-tin plating per /NOPB ordering code. Originally a National Semiconductor part acquired by TI; ROHS compliance per TI datasheet.
