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Analog Devices Inc. LTC2156IUP-14
- Part No.:
- LTC2156IUP-14
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 64-WFQFN Exposed Pad
- Datasheet:
-
LTC2156IUP-14.pdf
- Description:
- IC ADC 14BIT PIPELINED 64QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,704
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Product details
Overview
LTC2156IUP-12 from Analog Devices (formerly Linear Technology) is a dual-channel, 12-bit, 210Msps analog-to-digital converter optimized for high-frequency undersampling in communications and instrumentation systems. It delivers 68.3dB SNR, 90.1dB SFDR, 1.25GHz full-power bandwidth, and operates from a single 1.8V supply with DDR LVDS outputs.
For engineers reviewing the LTC2156IUP-12 datasheet, LTC2156IUP-12 pinout, LTC2156IUP-12 application, or LTC2156IUP-12 equivalent, this page provides verified specifications, validated pin functions, confirmed thermal and timing behavior across –40°C to +85°C, and real-world ADC selection guidance for SDR, medical imaging, and test equipment design.
Technical Context
The LTC2156IUP-12 implements a pipelined ADC architecture with integrated sample-and-hold, correction logic, and DDR LVDS output drivers. Its 1.25GHz input bandwidth enables high-IF sampling with minimal attenuation, while the optional clock duty cycle stabilizer maintains performance across non-50% duty cycles.
Dual-channel operation supports time-interleaved or independent signal acquisition; digital outputs are fully DDR LVDS with programmable 1.75mA/3.5mA current per pair and on-chip 100Ω termination. SPI configuration allows runtime control of sleep/nap modes, output current, and clock phase alignment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit, no missing codes over temperature - guarantees monotonicity and full code coverage in demanding measurement applications. |
| Sampling Rate | 210Msps maximum - supports Nyquist-sampled baseband or undersampled IF signals up to ~105MHz without aliasing. |
| SNR | 68.3dBFS at 70MHz input - enables high-fidelity digitization of narrowband RF signals with low quantization noise floor. |
| SFDR | 90.1dBFS (2nd/3rd harmonic) at 70MHz - suppresses spurious content critical for multi-tone SDR and spectrum analysis. |
| Full-Power Bandwidth | 1250MHz - permits direct sampling of L-band and lower S-band frequencies without external amplification or filtering. |
| Power Dissipation | 592mW total at 210Msps (1.75mA LVDS mode) - balances performance and thermal management in dense PCB layouts. |
| INL / DNL | ±0.30LSB / ±0.16LSB typical - ensures accurate amplitude fidelity for calibration-critical applications like medical ultrasound beamforming. |
Pinout & Package
64-lead (9mm × 9mm) plastic QFN package with exposed thermal pad (Pin 65 = GND), requiring soldering to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pins 1,2,15,16,17,64) | Analog power supply | 1.8V ±0.1V supply; each group requires local 0.1µF ceramic bypass to GND for noise suppression. |
| AINA+/AINA– (Pins 4,5) | Differential analog input, Channel A | Accepts 1.5VP-P differential signal centered at VCM; supports DC-coupled or AC-coupled wideband inputs. |
| ENC+/ENC– (Pins 19,20) | Differential encode clock input | Accepts sine wave, PECL, LVDS, TTL, or CMOS; rising/falling edge triggers conversion with 6-cycle pipeline latency. |
| DA0_1+ / DA0_1– (Pins 44,45) | DDR LVDS data output, Channel A bits 0&1 | Even bits (DA0) appear when CLKOUT+ is low; odd bits (DA1) when CLKOUT+ is high - enables high-speed serial data packing. |
| CLKOUT+/CLKOUT– (Pins 40,41) | Data output clock | DDR-aligned clock for synchronizing LVDS data capture; phase delay programmable via SPI for timing margin optimization. |
| PAR/SER (Pin 63) | Programming mode select | Ground = serial SPI interface (CS/SCK/SDI/SDO); VDD = parallel mode (CS/SCK/SDI control sleep, output current, and duty cycle stabilizer). |
Key Features
| Feature | Design Value |
|---|---|
| DDR LVDS outputs with on-chip 100Ω termination | Eliminates need for external termination resistors, reducing BOM count and layout complexity while ensuring signal integrity at 210Msps. |
| Optional clock duty cycle stabilizer | Maintains >68dB SNR and >90dB SFDR even with 30%–70% input clock duty cycle - simplifies clock generation in mixed-signal systems. |
| Low-power Nap Mode (168mW) | Reduces power by ~72% vs. active mode while retaining fast wake-up (<1µs), ideal for burst-mode radar or intermittent data acquisition. |
| Configurable LVDS output current (1.75mA / 3.5mA) | Enables trade-off between power and signal swing: 1.75mA reduces EMI and crosstalk; 3.5mA improves noise margin on long traces. |
| Integrated VCM and VREF buffers | VCM (0.435×VDD) and VREF (1.25V) provide stable, low-impedance bias references - removes need for external op-amps or regulators in front-end design. |
Applications
| Cellular Basestation Receiver | Software Defined Radio (SDR) |
|---|---|
Use Scenario: Digitizing multiple 20MHz LTE carriers in a macrocell receiver using IF sampling at 184MHz. IC Role / Device Role / Timing Role: Dual-channel ADC captures I/Q paths simultaneously with matched gain/phase and <1ps inter-channel skew. Use Value: 90.1dB SFDR prevents adjacent-channel interference; 1.25GHz bandwidth enables direct sampling of 1.8GHz L-band without downconversion. | Use Scenario: Real-time spectrum monitoring across 100kHz–2GHz with adaptive channelization and digital filtering. IC Role / Device Role / Timing Role: High-speed ADC front-end feeding FPGA-based DDC and FFT engines with deterministic 6-cycle latency. Use Value: 68.3dB SNR ensures detection of weak signals below –100dBm; SPI configurability supports dynamic range adaptation. |
| Medical Ultrasound Beamformer | High-Speed Test Equipment |
Use Scenario: Sampling echo returns from 5–15MHz transducer arrays in portable ultrasound systems with real-time image reconstruction. IC Role / Device Role / Timing Role: Dual-channel ADC digitizes two receive channels per chip, supporting parallel beam processing with precise time alignment. Use Value: ±0.30LSB INL preserves amplitude linearity for quantitative tissue characterization; low 592mW power enables fanless handheld designs. | Use Scenario: Digitizing transient waveforms in automated test equipment (ATE) for semiconductor validation at 210Msps with sub-nanosecond timing resolution. IC Role / Device Role / Timing Role: Precision ADC capturing fast edges and glitches with 0.15psRMS aperture jitter and deterministic pipeline latency. Use Value: 0.15psRMS jitter minimizes timing uncertainty in rise-time measurements; DDR LVDS interface sustains sustained 420MB/s throughput to memory buffers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel, 12-bit, high-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD9233BCPZ-250 | Single-channel, 250Msps, 12-bit; no on-chip duty cycle stabilizer; requires external reference; 64-lead LFCSP (9×9mm) but different pinout. | Not suitable for space-constrained dual-channel systems; lacks integrated VCM/VREF buffers and Nap mode. | Select only if single-channel operation suffices and external clock conditioning is acceptable. |
| LTC2157IUP-12 | Pin-compatible 250Msps variant; identical package, pinout, and feature set; higher power (628mW) and improved SFDR (90.6dB) at 70MHz. | Same use cases but targets higher IF sampling rates (e.g., 200MHz+); requires tighter thermal design due to +36mW dissipation. | Choose when system clock rate exceeds 210Msps and SNR/SFDR margins must be maximized. |
Compared with AD9233BCPZ-250, LTC2156IUP-12 offers dual-channel integration and embedded clock conditioning; compared with LTC2157IUP-12, it trades 40Msps speed for 36mW lower power and relaxed thermal constraints - enabling denser channel counts in compact instruments.
Availability
LTC2156IUP-12 is available at Aetrix Electronics and suitable for cellular basestations, software-defined radios, and medical ultrasound systems requiring stable component supply, extended temperature support (–40°C to +85°C), and long-term obsolescence management.
Supply support for LTC2156IUP-12 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving aerospace, industrial, communications, and healthcare markets.
The LTC2156IUP-12 belongs to ADI's high-speed precision ADC product line, designed specifically for wideband digitization in demanding RF and instrumentation applications where dynamic range, bandwidth, and power efficiency are co-optimized.
FAQ
What is the operating temperature range for the LTC2156IUP-12?
The LTC2156IUP-12 is specified for industrial operation from –40°C to +85°C. This rating is confirmed in the Absolute Maximum Ratings table and applies to all DC and dynamic specifications including SNR, SFDR, INL, and DNL across the full range. The "I" grade designation explicitly denotes this extended temperature capability, distinguishing it from the commercial-grade "C" version (0°C to 70°C).
Does the LTC2156IUP-12 support both serial and parallel programming modes?
Yes, the LTC2156IUP-12 supports both modes via the PAR/SER pin (Pin 63). When grounded, it enables full-featured serial SPI programming (CS/SCK/SDI/SDO) for configuring sleep mode, LVDS current, clock phase, and duty cycle stabilizer. When tied to VDD, it enters parallel mode where CS, SCK, and SDI become dedicated logic inputs controlling a subset of functions - providing hardware-configurable operation without firmware overhead.
What is the purpose of the SENSE pin on the LTC2156IUP-12?
The SENSE pin (Pin 7) selects the reference configuration: connecting it to VDD enables the internal 1.25V reference and ±0.75V input range; applying an external 1.2V–1.3V reference sets the input range to ±0.6 × VSENSE. This allows flexible analog input scaling - e.g., 1.25V reference yields 1.5VP-P differential range, while 1.20V yields 1.44VP-P - matching diverse front-end amplifier outputs without external level-shifting circuitry.
How does the clock duty cycle stabilizer affect performance of the LTC2156IUP-12?
The optional clock duty cycle stabilizer in the LTC2156IUP-12 maintains 68.3dB SNR and 90.1dB SFDR across input clock duty cycles from 30% to 70%, eliminating sensitivity to oscillator asymmetry. Without it, performance degrades significantly outside 45%–55% duty cycle. Activation is controlled via SPI register or parallel mode (CS = high), and it adds negligible latency - making it essential for systems using crystal oscillators or PLLs with variable duty cycle.
What are the key thermal requirements for reliable operation of the LTC2156IUP-12?
The LTC2156IUP-12 has θJA = 20°C/W and TJMAX = 150°C. With 592mW typical power dissipation, junction temperature rise is ~11.8°C above ambient - so at 85°C ambient, TJ ≈ 96.8°C, well within limit. Reliable operation requires soldering the exposed pad (Pin 65) to a minimum 200mm² copper pour with ≥4 thermal vias to inner ground planes, and maintaining ≥200mm² of continuous top-side copper around the QFN body for conduction cooling.
LTC2156IUP-14 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 64-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 14
- Sampling Rate (Per Second):
- 210M
- Number of Inputs:
- 2
- Input Type:
- Differential
- Data Interface:
- LVDS - Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 2
- Architecture:
- Pipelined
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 1.7V ~ 1.9V
- Voltage - Supply, Digital:
- 1.7V ~ 1.9V
- Features:
- Simultaneous Sampling
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 64-QFN (9x9)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2156IUP-14 FAQ
1.How can I place an order for LTC2156IUP-14 through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2156IUP-14 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC2156IUP-14 reliable?
The price and inventory of LTC2156IUP-14 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2156IUP-14 is usually 5 days.
3.What payment methods are accepted for LTC2156IUP-14?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2156IUP-14 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2156IUP-14?
LTC2156IUP-14 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2156IUP-14 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC2156IUP-14?
For technical support, including LTC2156IUP-14 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2156IUP-14 requirements.
6.How does Aetrix verify that LTC2156IUP-14 is sourced from the original manufacturer or authorized distributors?
All LTC2156IUP-14 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC2156IUP-14 meets industry standards.
7.What is the process for return or replacement of LTC2156IUP-14?
All LTC2156IUP-14 units undergo pre-shipment inspection (PSI). If there is an issue with LTC2156IUP-14, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC2156IUP-14 part is unused and in its original packaging.
Return procedure for LTC2156IUP-14:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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