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Analog Devices Inc. LTC2171IUKG-12
- Part No.:
- LTC2171IUKG-12
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 52-WFQFN Exposed Pad
- Datasheet:
-
LTC2171IUKG-12.pdf
- Description:
- IC ADC 12BIT PIPELINED 52QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,418
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Product details
Overview
LTC2171IUKG-12 from Analog Devices (acquired Linear Technology) is a 12-bit, 4-channel simultaneous-sampling analog-to-digital converter optimized for high-frequency communications signal digitization. It delivers 71dB SNR and 90dB SFDR at 40Msps sampling rate, with ultralow 0.15psRMS jitter and 800MHz full-power bandwidth - enabling undersampling of IF signals in cellular base stations and software-defined radios.
For engineers reviewing the LTC2171IUKG-12 datasheet, LTC2171IUKG-12 pinout, LTC2171IUKG-12 application, or LTC2171IUKG-12 equivalent, key selection criteria include its quad-channel synchronization capability, serial LVDS output architecture (1- or 2-lane), 1.8V single-supply operation, ±0.3LSB INL, and industrial temperature range (–40°C to +85°C).
Technical Context
The LTC2171IUKG-12 implements four independent 12-bit ADC cores with shared sample-and-hold and internal clock duty cycle stabilizer, supporting differential or single-ended encode inputs (PECL/LVDS/TTL/CMOS). Its architecture enables true simultaneous sampling across all channels without inter-channel skew.
Digital outputs use programmable serial LVDS drivers with selectable 1.75mA or 3.5mA current modes, optional internal 100Ω termination, and configurable 12-/14-/16-bit serialization per channel. The SPI interface allows real-time configuration of input range (1–2VP-P), power modes (Nap/Sleep), and output formatting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes over temperature - guarantees monotonicity and full code coverage in closed-loop control or medical imaging systems. |
| Sampling Rate | 40Msps - fixed speed grade for LTC2171-12 variant; determines maximum Nyquist bandwidth (20MHz) and real-time data throughput. |
| SNR / SFDR | 71dB SNR and 90dB SFDR at 70MHz input - enables high-fidelity digitization of wideband RF signals with minimal noise floor degradation. |
| Analog Input BW | 800MHz full-power bandwidth - supports direct sampling of L-band and S-band IF signals without external amplification or filtering. |
| Power Consumption | 198mW total at 40Msps (2-lane, 3.5mA mode) - enables thermal-constrained portable or multi-ADC array designs. |
| Jitter Performance | 0.15psRMS aperture jitter - limits sampling uncertainty to <0.01% of period at 70MHz, preserving ENOB in undersampling applications. |
| INL / DNL | ±0.3LSB INL and ±0.1LSB DNL (typ) - ensures accurate amplitude linearity for precision instrumentation and calibration-critical systems. |
Pinout & Package
52-pin (7mm × 8mm) plastic QFN package with exposed thermal pad (Pin 53 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN1+ / AIN1– (Pins 1, 2) | Channel 1 differential analog input | Accepts 1–2VP-P differential signal; common-mode bias provided by VCM12 (Pin 3) at ~0.9V. |
| ENC+ / ENC– (Pins 17, 18) | Differential encode clock input | Triggers simultaneous sampling on both edges; supports duty cycle stabilization for non-50% clocks. |
| OUT1A+/OUT1A– (Pins 40, 39) | LVDS serial data output lane A, Channel 1 | Carries serialized MSBs in 2-lane mode; configurable for 12/14/16-bit format via SPI or PAR/SER pin. |
| FR+/FR– (Pins 31, 32) | Frame clock differential output | Indicates start of new conversion frame; aligned to DCO edge with programmable delay (0.35–0.65×tSER). |
| PAR/SER (Pin 29) | Programming mode select | Low = serial SPI programming; high = parallel pin-strapped configuration (e.g., lane count, current mode). |
| VDD (Pins 15, 16, 51, 52) | Analog supply | 1.7–1.9V single rail powers all ADC cores and sample-and-hold; requires local 0.1µF ceramic bypassing. |
Key Features
| Feature | Design Value |
|---|---|
| Quad simultaneous sampling | Eliminates inter-channel timing skew (<1ps) - critical for beamforming, I/Q demodulation, and phase-coherent multichannel acquisition. |
| Serial LVDS output architecture | Reduces interface pin count by >50% vs parallel CMOS; supports 1- or 2-lane per channel with programmable serialization depth. |
| Internal clock duty cycle stabilizer | Enables high-performance operation with asymmetric clocks (e.g., from FPGA PLLs), removing need for external duty-cycle correction circuitry. |
| Selectable input range (1–2VP-P) | Optimizes dynamic range utilization across varying signal amplitudes without external gain staging or resistor networks. |
| Nap mode (75mW) and Sleep mode (1mW) | Provides three-tiered power scaling - Nap retains register state and reference; Sleep disables all analog blocks for rapid wake-up. |
Applications
| Cellular Base Station Receivers | Software Defined Radios (SDR) |
|---|---|
Use Scenario: Digitizing multiple 20MHz LTE carriers within a 100MHz instantaneous bandwidth using direct IF sampling at 70–140MHz. IC Role / Device Role / Timing Role: Quad-channel simultaneous ADC providing phase-aligned I/Q data streams for digital downconversion and MIMO processing. Use Value: 90dB SFDR prevents adjacent-channel interference; 0.15psRMS jitter preserves EVM under high-order QAM modulation. |
Use Scenario: Reconfigurable front-end for military/commercial SDR platforms requiring agile frequency hopping and multi-standard support (FM, DAB, LTE, WiFi). IC Role / Device Role / Timing Role: High-linearity, low-jitter digitizer enabling real-time spectrum analysis and adaptive filtering across 10kHz–200MHz. Use Value: 800MHz analog bandwidth eliminates external tracking filters; serial LVDS reduces FPGA I/O resource usage by 60%. |
| Portable Medical Ultrasound | Multichannel Data Acquisition Systems |
Use Scenario: Beamformed echo signal digitization from 64–128 transducer elements in handheld ultrasound scanners. IC Role / Device Role / Timing Role: Simultaneous-sampling ADC capturing time-aligned RF echoes for synthetic aperture reconstruction and Doppler processing. Use Value: ±0.3LSB INL ensures accurate tissue contrast; 198mW total power enables battery-operated 8-channel acquisition modules. |
Use Scenario: High-channel-count test equipment for aerospace sensor monitoring (vibration, strain, temperature) with synchronized sampling across 16+ channels. IC Role / Device Role / Timing Role: Precision digitizer providing deterministic latency (6-cycle pipeline) and sub-ns inter-channel skew for time-of-flight analysis. Use Value: SPI-configurable Nap mode enables burst acquisition with <1µs wake-up; 71dB SNR resolves µV-level sensor outputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-channel, 12-bit ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD9257BSTZ-40 | 40Msps, 14-bit, JESD204B output; higher resolution but no serial LVDS; 1.8V supply; 72dB SNR. | Requires FPGA with JESD204B IP; better for high-resolution spectral analysis where LVDS interface is not constrained. | Choose AD9257BSTZ-40 when 14-bit resolution and JESD204B compatibility outweigh LVDS simplicity and lower power. |
| LTC2170IUKG-12 | 25Msps speed grade; identical pinout, features, and package; 160mW power; same 71dB SNR/SFDR specs. | Lower sampling rate suits narrowband IoT gateways or low-latency sensor fusion where 20MHz Nyquist is sufficient. | Choose LTC2170IUKG-12 when system bandwidth requirements are ≤12.5MHz and ultra-low power (160mW) is prioritized. |
Compared with LTC2171IUKG-12, AD9257BSTZ-40 trades LVDS simplicity for JESD204B scalability and higher resolution, while LTC2170IUKG-12 maintains full compatibility at reduced speed and power - enabling drop-in migration within the same PCB layout.
Availability
LTC2171IUKG-12 is available at Aetrix Electronics and suitable for cellular infrastructure, software-defined radio development, and portable medical imaging requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2171IUKG-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 industrial, automotive, communications, and healthcare markets.
The LTC2171IUKG-12 belongs to ADI's high-speed data converter product line, designed specifically for demanding communications and instrumentation applications requiring simultaneous multichannel sampling, low jitter, and robust LVDS interfacing.
FAQ
What is the maximum sampling rate supported by the LTC2171IUKG-12?
The LTC2171IUKG-12 is a fixed-speed-grade device rated for 40Msps operation. This is distinct from the LTC2172-12 (65Msps) and LTC2170-12 (25Msps) variants in the same family. The 40Msps rate is guaranteed across the full industrial temperature range (–40°C to +85°C) and defines the Nyquist bandwidth and real-time data throughput of the LTC2171IUKG-12.
Does the LTC2171IUKG-12 support both 1-lane and 2-lane LVDS output modes?
Yes, the LTC2171IUKG-12 supports both 1-lane and 2-lane serial LVDS output configurations. Lane count is selected via the CS pin in parallel programming mode (PAR/SER = VDD) or through SPI register write. In 2-lane mode, each channel outputs two bits per clock cycle; in 1-lane mode, it outputs one bit per cycle - directly affecting required FPGA I/O resources and serialization clock frequency for the LTC2171IUKG-12.
What is the analog input common-mode voltage range for the LTC2171IUKG-12?
The LTC2171IUKG-12 provides two dedicated common-mode bias outputs: VCM12 (Pin 3) for channels 1 and 2, and VCM34 (Pin 12) for channels 3 and 4. Each outputs nominally VDD/2 (≈0.9V at 1.8V supply), with specified tolerance of VCM ±100mV. These pins must be bypassed to ground with 0.1µF ceramic capacitors and used to bias the differential analog inputs of their respective channel pairs.
How does the duty cycle stabilizer in the LTC2171IUKG-12 improve system design?
The internal duty cycle stabilizer in the LTC2171IUKG-12 compensates for non-50% duty cycle encode clocks, allowing high AC performance even with asymmetric waveforms from FPGA PLLs or crystal oscillators. This eliminates the need for external duty-cycle correction circuits, reduces board space, and simplifies clock tree design - particularly valuable in compact SDR and test equipment where the LTC2171IUKG-12 operates under tight layout constraints.
Can the LTC2171IUKG-12 operate with an external voltage reference?
Yes, the LTC2171IUKG-12 supports both internal and external reference operation. When using an external reference, the SENSE pin (Pin 28) accepts a 0.625V to 1.300V voltage, which sets the full-scale input range. External reference mode improves gain matching (±0.2%FS) and reduces drift sensitivity, making the LTC2171IUKG-12 suitable for precision multichannel measurement systems where channel-to-channel consistency is critical.
LTC2171IUKG-12 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 52-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 40M
- Number of Inputs:
- 4
- Input Type:
- Differential
- Data Interface:
- LVDS - Serial
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 4
- 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:
- 52-QFN (7x8)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2171IUKG-12 FAQ
1.How can I place an order for LTC2171IUKG-12 through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2171IUKG-12 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 LTC2171IUKG-12 reliable?
The price and inventory of LTC2171IUKG-12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2171IUKG-12 is usually 5 days.
3.What payment methods are accepted for LTC2171IUKG-12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2171IUKG-12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2171IUKG-12?
LTC2171IUKG-12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2171IUKG-12 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 LTC2171IUKG-12?
For technical support, including LTC2171IUKG-12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2171IUKG-12 requirements.
6.How does Aetrix verify that LTC2171IUKG-12 is sourced from the original manufacturer or authorized distributors?
All LTC2171IUKG-12 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 LTC2171IUKG-12 meets industry standards.
7.What is the process for return or replacement of LTC2171IUKG-12?
All LTC2171IUKG-12 units undergo pre-shipment inspection (PSI). If there is an issue with LTC2171IUKG-12, 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 LTC2171IUKG-12 part is unused and in its original packaging.
Return procedure for LTC2171IUKG-12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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