CLC5956IMTD - 12-Bit 65 MSPS ADC | National Semiconductor
MPN: CLC5956IMTD ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $28.5 | $28.50 |
| 10 | $26.1 | $261.00 |
| 100 | $23.75 | $2,375.00 |
| 500 | $21.4 | $10,700.00 |
| 1,000 | $19.05 | $19,050.00 |
CLC5956IMTD Overview
An ADC (Analog-to-Digital Converter) is a data acquisition semiconductor that converts continuous analog signals into discrete digital codes. The 12-bit ADC category sits within the data converter hierarchy: ADC -> data converter -> signal chain IC -> mixed-signal semiconductor. Pipelined ADCs like the CLC5956IMTD use a multi-stage architecture to achieve high sampling rates while maintaining moderate resolution, making them well-suited for communications infrastructure and IF sampling.
Key features include a 65 MSPS sampling rate, pipelined architecture, 48-TSSOP surface-mount package, and an operating temperature range of -40C to +85C suitable for industrial-grade deployment. The integrated track-and-hold front end simplifies external circuit design, while the parallel digital interface provides fast data throughput to downstream ASICs, FPGAs, or DSP processors without serialization latency.
The CLC5956IMTD utilizes a bipolar-CMOS process that combines low-noise analog sampling with high-speed digital output logic. Its pipelined architecture delivers low latency and excellent dynamic range, enabling accurate capture of wideband modulated signals in receiver and instrumentation applications. The part was specifically designed for cellular base station IF strips where high spurious-free dynamic range and reliable sampling performance are essential.
Typical applications include cellular base station receiver IF digitizers, broadband cable infrastructure, medical imaging systems, radar signal processing front ends, and high-speed instrumentation digitizers. The combination of 12-bit resolution and 65 MSPS throughput enables direct IF sampling in many communication system designs.
When designing with this obsolete part, engineers should note that new designs are recommended to use modern pin-compatible alternatives or current-generation ADCs. Proper input analog anti-alias filtering and a low-jitter sampling clock are critical to achieving the rated SNR and SFDR specifications across the input frequency band.
This page synthesizes distributor stock data, drop-in replacement candidates, and design notes that complement the original National Semiconductor datasheet and accelerate obsolescence management for legacy cellular base station hardware.
Drop-in alternatives for CLC5956IMTD — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with CLC5956IMTD (same form factor and footprint) — differing in Package, RoHS Status, Sampling Rate, Architecture, Analog Supply Voltage.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADS8401IPFBT
✅ Drop-In📋 Reference alternative (not in catalog)
ADS8401IBPFBR
✅ Drop-In✓ In Stock
$11.75 / Unit
View Datasheet →ADS8508IBDWRG4
✅ Drop-In✓ In Stock
$7.1 / Unit
View Datasheet →CLC5956IMTD Maximum Ratings & Electrical Characteristics
| Number of Bits | 12 |
| Sampling Rate | 65 MSPS |
| Number of Inputs | 1 |
| Input Type | Single-Ended |
| Data Interface | Parallel |
| Architecture | Pipelined |
| Analog Input Voltage Range | 2.048 V |
| Package | 48-TSSOP (6.10 mm width) |
| Operating Temperature | -40C to +85C |
| Mounting Type | Surface Mount |
| Packaging | Tube |
| Number of Terminals | 48 |
| Polarity | Unipolar (Bipolar Capable) |
| Application | Cellular base station IF / broadband |
| RoHS Status | unknown |
CLC5956IMTD 48-tssop (6.10 mm width) Pin Configuration Guide
Pin configuration for CLC5956IMTD (48-tssop (6.10 mm width) package). This analog component features input, output, and power supply pins. Refer to the manufacturer datasheet for offset null, compensation, and enable pin configurations. Ideal for signal conditioning and amplifier circuits.
No detailed pinout data available for CLC5956IMTD.
Refer to the datasheet for full pin configuration.
Typical Applications
CLC5956IMTD is suitable for 7 applications: Cellular Base Station IF Sampling, Broadband Cable Infrastructure, Medical Imaging Front End, Radar Signal Processing, High-Speed Instrumentation, Industrial Process Control Digitizer, Communications Test Equipment.
Cellular Base Station IF Sampling
The CLC5956IMTD's 12-bit resolution and 65 MSPS sampling rate make it suitable for digitizing intermediate frequency (IF) signals in cellular base station receivers. With 2.048 V analog input range and pipelined architecture, the converter captures wideband modulated carriers while preserving dynamic range for downstream channelization. The 48-TSSOP package integrates the track-and-hold front end, simplifying receiver design, while the parallel digital output interfaces directly to baseband DSP or FPGA processors. Best for legacy GSM/UMTS IF strips; new designs should use modern JESD204B ADCs with higher channel density.
Recommended
Broadband Cable Infrastructure
The CLC5956IMTD's 65 MSPS throughput supports digitizing upstream and downstream channels in broadband cable head-end and node equipment. The pipelined 12-bit core captures multiple QAM carriers across a wide IF band, while the integrated track-and-hold ensures accurate sampling under rapid signal transitions. Industrial -40C to +85C operation tolerates uncontrolled outside-plant enclosures. For modern DOCSIS 3.1 designs, multi-channel 12-bit ADCs with sampling rates up to 200 MSPS provide better carrier aggregation.
Recommended
Medical Imaging Front End
The CLC5956IMTD delivers 65 MSPS at 12-bit resolution for medical ultrasound and imaging system front-end digitizers, capturing high-frequency transducer return signals with adequate dynamic range. The parallel interface eliminates serializer latency for real-time B-mode image reconstruction, and the integrated track-and-hold reduces external component count. Industrial temperature grade supports portable cart-based equipment. Modern ultrasound designs favor multi-channel 14-bit ADCs at 65 to 80 MSPS for higher harmonic imaging resolution.
Recommended
Radar Signal Processing
The CLC5956IMTD's 12-bit resolution at 65 MSPS enables IF digitizing in short-range radar systems such as industrial proximity sensors, weather radar IF strips, and automotive pre-driver assistance modules. The pipelined architecture provides deterministic latency required for matched-filter pulse compression. Pairs with a low-jitter sampling clock source for best SFDR in dense target environments. For modern automotive radar, 12-bit ADCs at 80 to 100 MSPS with LVDS outputs are preferred.
Recommended
High-Speed Instrumentation
The CLC5956IMTD supports digitizer cards in test and measurement instrumentation such as oscilloscopes, spectrum analyzers, and transient recorders, where 12-bit resolution at 65 MSPS is adequate for general-purpose waveform capture. Parallel output bus enables direct connection to FPGAs for custom DSP processing. Industrial temperature range supports bench and field-deployed instruments. Modern instruments typically use 14 to 16-bit ADCs at higher sample rates for improved vertical resolution.
Recommended
Industrial Process Control Digitizer
The CLC5956IMTD's wide operating temperature range of -40C to +85C and 65 MSPS sample rate suit industrial vibration monitoring, acoustic emission analysis, and high-speed control loop digitizers. The integrated track-and-hold and 12-bit resolution are sufficient for vibration spectral analysis up to 25 kHz. Parallel interface simplifies connection to industrial DSP controllers. New designs benefit from simultaneous-sampling 12 to 16-bit ADCs with wider dynamic range for predictive maintenance.
Recommended
Communications Test Equipment
The CLC5956IMTD digitizes modulated signals in communications test and measurement equipment such as signal analyzers, base station testers, and protocol conformance systems. The 65 MSPS sample rate captures signals with bandwidth up to 25 MHz suitable for analyzing 2G/3G cellular waveforms and narrowband wireless protocols. Industrial temperature operation supports lab and field test gear. Modern testers use 14-bit ADCs at 250 to 500 MSPS for 5G NR waveform analysis.
Recommended
Recommended Products Summary
Engineering reference data for CLC5956IMTD — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADS8401IPFBT | ADS8401IBPFBR | ADS8508IBDWRG4 |
|---|---|---|---|---|
| Brand | National Semiconductor (Texas Instruments) | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 48-TSSOP | 48-TQFP (PFB) - same 48-pin family | 48-TQFP (PFB) - same 48-pin family | 28-SOIC (DW) - different pin count |
| Resolution | 12-bit | 12-bit | 12-bit | 12-bit |
| Sampling Rate | 65 MSPS | 1.5 MSPS | 1.5 MSPS | 0.25 MSPS |
| Architecture | Pipelined | SAR | SAR | SAR |
| Lifecycle Status | Obsolete | Active | Active | Active |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| Data Interface | Parallel | Parallel | Parallel | Parallel/Serial |
Key Differentiators
- Legacy 65 MSPS 12-bit pipelined performance (vs ADS8401IPFBT)
- Drop-in 48-pin package family for legacy PCB (vs ADS8401IBPFBR)
- Active lifecycle alternative available (vs ADS8508IBDWRG4)
Design Notes
The CLC5956IMTD is obsolete and not recommended for new designs. New cellular base station or broadband IF sampling designs should use current-generation 12-bit 80 to 125 MSPS pipelined ADCs from Texas Instruments or Analog Devices, which offer better SNR/SFDR, lower power, and JESD204B serial outputs for modern FPGA interfaces. The CLC5956IMTD should only be used for maintenance of legacy hardware.
When designing the PCB for the CLC5956IMTD, isolate the analog and digital ground planes and join them only at the ADC's AGND pin. Use a low-jitter differential clock driver for the sampling clock input and place the clock trace over a continuous ground plane. Route the parallel output bus with matched trace lengths and 50 ohm characteristic impedance where possible to avoid digital feedback into the analog input.
For best dynamic range, drive the CLC5956IMTD analog input through a low-noise, low-distortion differential amplifier and provide a low-impedance reference decoupling network. Sampling clock jitter should be below 1 ps RMS to preserve SNR at high input frequencies. Place the input anti-alias filter with sharp roll-off at the Nyquist frequency to prevent out-of-band aliasing into the baseband.
Compliance Information
Compliance status not explicitly documented in the verified web data for the obsolete CLC5956IMTD. Engineers requiring RoHS, REACH, or other compliance certificates should contact Rochester Electronics for the obsolete inventory they hold.
