LTC2171CUKG-14 - 14-Bit 40Msps Quad ADC | Analog Devices
MPN: LTC2171CUKG-14 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $42.5 | $42.50 |
| 10 | $38.25 | $382.50 |
| 100 | $33.95 | $3,395.00 |
| 500 | $30.1 | $15,050.00 |
| 1,000 | $26.75 | $26,750.00 |
LTC2171CUKG-14 Overview
An ADC (analog-to-digital converter) is a semiconductor device that samples a continuous-time analog signal and converts each sample into a discrete digital code. Pipelined ADCs use a multi-stage architecture in which each stage performs a low-resolution conversion and passes the residue to the next stage, enabling high sampling rates with low power consumption. Quad (4-channel) ADCs like the LTC2171CUKG-14 belong to the family of simultaneous-sampling data converters used in systems that require multiple analog inputs to be captured at the same instant, such as phased-array receivers, multi-antenna base stations, and medical imaging front-ends.
The LTC2171CUKG-14 features ±1 LSB INL (typical), ±0.3 LSB DNL (typical), no missing codes over temperature, and 1.2 LSB RMS transition noise. SFDR is 90 dB, and the device achieves an 800 MHz full-power analog input bandwidth. The digital interface is serial LVDS, configurable as one bit per channel (1-lane mode) or two bits per channel (2-lane mode), reducing pin count and easing FPGA/CPLD interconnect. Selectable input ranges of 1 Vp-p to 2 Vp-p allow direct connection to a wide range of front-end amplifiers and IF stages.
The device includes shutdown and nap power-saving modes, a sample-and-hold amplifier on every channel, and a serial SPI port for mode configuration. The 52-pin QFN package uses a bottom-side exposed pad that conducts the majority of die heat into the PCB, requiring careful thermal layout (multiple thermal vias under the EP) for reliable operation. Pin-compatible 14-bit and 12-bit versions exist within the LTC2170/LTC2171/LTC2150/LTC2151 family, allowing resolution scaling without PCB redesign.
Typical applications include multi-carrier cellular base-station receivers, portable ultrasound imaging, non-invasive medical instrumentation, multi-antenna diversity receivers, and industrial multichannel data acquisition. The combination of quad simultaneous sampling, low power, and serial LVDS outputs also suits phased-array radar, software-defined radio (SDR), and handheld test equipment.
A key design consideration is that the LVDS interface requires a 100 Ω termination at the receiver and matched-length PCB traces; the analog inputs are differential and should be AC- or DC-coupled through a balun or driver such as the ADA4927 for best second-order distortion performance. Decoupling the 1.8 V analog and digital supplies separately near the EP ground is essential to keep digital switching noise out of the analog front end.
This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical design notes not all available in a single manufacturer datasheet, with cross-references to same-family and same-package parts (LTC2170, LTC2151, LTC2150, LTC2145) for design flexibility.
Drop-in alternatives for LTC2171CUKG-14 — 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 LTC2171CUKG-14 (same form factor and footprint) — differing in Package, Operating Temperature Range, Resolution, Digital Output Interface, Sampling Rate.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTC2170CUKG-14
✅ Drop-In✓ In Stock
$27.18 / Unit
View Datasheet →LTC2172CUKG-14
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2171IUKG-14
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2171CUKG-12
✅ Drop-In✓ In Stock
$24 / Unit
View Datasheet →LTC2170CUKG-12
✅ Drop-In✓ In Stock
$20.65 / Unit
View Datasheet →LTC2156IUP-14
✅ Drop-In✓ In Stock
$134.1 / Unit
View Datasheet →LTC2171CUKG-14 Maximum Ratings & Electrical Characteristics
| Resolution | 14 bits |
| Number of Channels | 4 (simultaneous sampling) |
| Sampling Rate | 40 Msps per channel |
| Architecture | Pipelined |
| Supply Voltage | 1.8 V (single supply) |
| Total Power Dissipation | 311 mW (typ) |
| Power per Channel | 78 mW (typ) |
| INL (Integral Non-Linearity) | ±1 LSB (typ) |
| DNL (Differential Non-Linearity) | ±0.3 LSB (typ) |
| Transition Noise | 1.2 LSB RMS |
| SFDR (Spurious-Free Dynamic Range) | 90 dB |
| Analog Input Bandwidth | 800 MHz full power |
| Input Voltage Range | 1 Vp-p to 2 Vp-p (selectable) |
| Digital Output Interface | Serial LVDS (1-lane or 2-lane) |
| Configuration Interface | Serial SPI |
| Power-Saving Modes | Shutdown and Nap |
| Missing Codes | No missing codes over temperature |
| Package | 52-pin QFN (7 mm × 8 mm) with EP |
| Operating Temperature Range | 0 °C to +70 °C (C-suffix) |
| Pin-Compatible Family | 12-bit and 14-bit versions (LTC2170, LTC2151, LTC2150) |
LTC2171CUKG-14 Pin Configuration
| Pin 1 | GND — Ground |
| Pin 2 | AIN1+ — Channel 1 analog input, positive |
| Pin 3 | AIN1- — Channel 1 analog input, negative |
| Pin 4 | AIN2+ — Channel 2 analog input, positive |
| Pin 5 | AIN2- — Channel 2 analog input, negative |
| Pin 6 | GND — Ground |
| Pin 7 | VCM — Common-mode voltage output |
| Pin 8 | VREF — Voltage reference bypass |
| Pin 9 | SENSE — Input range select |
| Pin 10 | GND — Ground |
| Pin 11 | AIN3+ — Channel 3 analog input, positive |
| Pin 12 | AIN3- — Channel 3 analog input, negative |
| Pin 13 | AIN4+ — Channel 4 analog input, positive |
| Pin 14 | AIN4- — Channel 4 analog input, negative |
| Pin 15 | GND — Ground |
| Pin 16 | ENC+ — Encode clock input, positive |
| Pin 17 | ENC- — Encode clock input, negative |
| Pin 18 | GND — Ground |
| Pin 19 | OVDD — LVDS output supply |
| Pin 20 | OGND — LVDS output ground |
| Pin 21 | OUT1A+ — LVDS output channel 1 lane A, positive |
| Pin 22 | OUT1A- — LVDS output channel 1 lane A, negative |
| Pin 23 | OUT1B+ — LVDS output channel 1 lane B, positive |
| Pin 24 | OUT1B- — LVDS output channel 1 lane B, negative |
| Pin 25 | OGND — LVDS output ground |
| Pin 26 | OVDD — LVDS output supply |
| Pin 27 | OUT2A+ — LVDS output channel 2 lane A, positive |
| Pin 28 | OUT2A- — LVDS output channel 2 lane A, negative |
| Pin 29 | OUT2B+ — LVDS output channel 2 lane B, positive |
| Pin 30 | OUT2B- — LVDS output channel 2 lane B, negative |
| Pin 31 | OGND — LVDS output ground |
| Pin 32 | FR+ — Frame output, positive |
| Pin 33 | FR- — Frame output, negative |
| Pin 34 | CLKOUT+ — Clock output, positive |
| Pin 35 | CLKOUT- — Clock output, negative |
| Pin 36 | OGND — LVDS output ground |
| Pin 37 | OUT3A+ — LVDS output channel 3 lane A, positive |
| Pin 38 | OUT3A- — LVDS output channel 3 lane A, negative |
| Pin 39 | OUT3B+ — LVDS output channel 3 lane B, positive |
| Pin 40 | OUT3B- — LVDS output channel 3 lane B, negative |
| Pin 41 | OGND — LVDS output ground |
| Pin 42 | OUT4A+ — LVDS output channel 4 lane A, positive |
| Pin 43 | OUT4A- — LVDS output channel 4 lane A, negative |
| Pin 44 | OUT4B+ — LVDS output channel 4 lane B, positive |
| Pin 45 | OUT4B- — LVDS output channel 4 lane B, negative |
| Pin 46 | OGND — LVDS output ground |
| Pin 47 | OVDD — LVDS output supply |
| Pin 48 | CS — SPI chip select |
| Pin 49 | SCK — SPI clock |
| Pin 50 | SDI — SPI data input |
| Pin 51 | SDO — SPI data output |
| Pin 52 | PD — Power-down control |
Typical Applications
LTC2171CUKG-14 is suitable for 7 applications: Multi-Carrier Cellular Base-Station Receiver, Portable Ultrasound Imaging Front-End, Multi-Antenna Diversity Receiver, Phased-Array Radar Signal Capture, Software-Defined Radio (SDR) Multi-Channel Digitizer, Industrial Multi-Channel Data Acquisition, Handheld Test and Measurement Equipment.
Multi-Carrier Cellular Base-Station Receiver
The LTC2171CUKG-14's four simultaneously-sampling 14-bit 40 Msps channels with 90 dB SFDR are well matched to multi-carrier cellular base-station receivers where four diversity or sector antennas must be digitized at the same instant. The serial LVDS interface reduces FPGA pin count when capturing multiple antenna streams, while 78 mW per channel keeps board-level thermal budgets within reach for outdoor radio units. The 800 MHz full-power input bandwidth allows direct IF sampling of cellular bands without an external down-conversion mixer, reducing BOM cost.
Recommended
Portable Ultrasound Imaging Front-End
In portable ultrasound systems, the LTC2171CUKG-14's 4-channel simultaneous sampling at 40 Msps captures 4 transducer channels per chip, allowing the system to scale to 16, 32, or 64 channels by stacking multiple devices. The 14-bit dynamic range and 1.2 LSB RMS transition noise preserve the low-contrast resolution required for soft-tissue imaging, while the 78 mW per channel consumption is low enough to enable battery-powered cart-based units. The serial LVDS output reduces cable count between the probe head and the beamforming back-end, which is critical in tight probe enclosures.
Recommended
Multi-Antenna Diversity Receiver
The LTC2171CUKG-14 is purpose-built for multi-antenna diversity and MIMO receiver designs, where 4 simultaneously-sampling 14-bit channels with 800 MHz input bandwidth allow direct digitization of IF outputs from 4 antennas. The 1.2 LSB RMS transition noise and 90 dB SFDR preserve modulation accuracy for 4G LTE and 5G NR signals, while the SPI-configurable 1-lane or 2-lane LVDS output adapts to the FPGA's available SERDES lanes. The 1.8 V single-supply operation simplifies power-tree design in compact radio modules.
Recommended
Phased-Array Radar Signal Capture
Phased-array radar systems require tight time-alignment across many receiver channels, and the LTC2171CUKG-14's 4 simultaneously-sampling inputs with matched latency are ideal for digitizing sub-array outputs. The 14-bit resolution at 40 Msps captures the dynamic range of modern radar returns, while the 800 MHz analog input bandwidth supports direct L-band or S-band IF sampling. The serial LVDS interface enables long-distance backplane data transmission to the FPGA signal processor with low EMI, important in dense radar array assemblies.
Recommended
Software-Defined Radio (SDR) Multi-Channel Digitizer
In wideband SDR platforms the LTC2171CUKG-14's 14-bit resolution and 40 Msps sampling rate with 800 MHz input bandwidth support direct sampling of HF/VHF signals, capturing 4 independent antenna or band streams. The 1.2 LSB RMS transition noise floor and 90 dB SFDR preserve weak-signal decoding performance, while the serial LVDS output interfaces natively to most modern FPGAs used for digital down-conversion. The SPI port allows real-time reconfiguration of input range and lane mode without software restart.
Recommended
Industrial Multi-Channel Data Acquisition
Industrial data acquisition systems often require sampling 4 sensor channels at the same instant, which is exactly what the LTC2171CUKG-14 provides. The 14-bit resolution captures the dynamic range of strain-gauge, vibration, and acoustic-emission sensors, while the 1 Vp-p to 2 Vp-p selectable input range allows direct connection to standard industrial sensor outputs without additional signal conditioning. The single 1.8 V supply and shutdown/nap modes simplify power management in distributed DAQ nodes.
Recommended
Handheld Test and Measurement Equipment
Handheld oscilloscopes, spectrum analyzers, and bench-top test equipment benefit from the LTC2171CUKG-14's combination of 14-bit resolution, 40 Msps, and 4 channels. Multiple acquisition channels allow 4 simultaneous scope inputs or 4 sensor inputs in a portable instrument, while the 311 mW total power dissipation supports multi-hour battery operation. The serial LVDS interface keeps FPGA pin count low, leaving more logic resources for trigger and analysis functions in space-constrained handheld enclosures.
Recommended
Recommended Products Summary
Engineering reference data for LTC2171CUKG-14 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC2170CUKG-14 | LTC2172CUKG-14 | LTC2171IUKG-14 | LTC2171CUKG-12 | LTC2170CUKG-12 |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 52-pin QFN (7x8 mm) | 52-pin QFN (7x8 mm) - same | 52-pin QFN (7x8 mm) - same | 52-pin QFN (7x8 mm) - same | 52-pin QFN (7x8 mm) - same | 52-pin QFN (7x8 mm) - same |
| Resolution | 14 bits | 14 bits | 14 bits | 14 bits | 12 bits | 12 bits |
| Sampling Rate | 40 Msps | 25 Msps | 65 Msps | 40 Msps | 40 Msps | 25 Msps |
| Number of Channels | 4 | 4 | 4 | 4 | 4 | 4 |
| Power (total) | 311 mW | 202 mW | 453 mW | 311 mW | 260 mW | 162 mW |
| Operating Temperature | 0C to +70C | 0C to +70C | 0C to +70C | -40C to +85C | 0C to +70C | 0C to +70C |
| Output Interface | Serial LVDS | Serial LVDS | Serial LVDS | Serial LVDS | Serial LVDS | Serial LVDS |
Key Differentiators
- Only family member combining 14-bit, 40 Msps, and 4 channels in the same 52-pin QFN (vs LTC2170CUKG-14)
- Industrial temperature grade upgrade path on the same footprint (vs LTC2171IUKG-14)
- Lower-power 12-bit option in identical package (vs LTC2171CUKG-12)
Design Notes
Most of the heat generated by the LTC2171CUKG-14 is transferred from the die through the bottom-side exposed pad and package leads onto the printed circuit board, per the Analog Devices datasheet. The PCB must provide a continuous unbroken ground plane directly under the exposed pad, stitched with a dense array of thermal vias (typically 9 to 25 vias on a 0.5 mm pitch) connecting the EP to inner ground planes. Without this thermal path the junction temperature can exceed 125 C at 40 Msps with all 4 channels active.
Separate analog (AVDD) and digital (OVDD) supply planes should be used, joined only at a single point near the ADC's ground pin. The LVDS output traces must be 100 Ω differential impedance-controlled, length-matched within the lane, and terminated at the receiver with a 100 Ω resistor across the pair. The encode clock (ENC+/ENC-) trace must be length-matched to the LVDS data traces to minimize sample-to-output timing skew. Place 0.1 µF and 10 µF decoupling capacitors as close as possible to every supply pin.
Do not leave the analog inputs floating - the LTC2171CUKG-14 requires a DC path to the common-mode voltage VCM through external resistors or the driving amplifier's output common-mode. The serial SPI port uses 1.8 V logic levels and is not 3.3 V tolerant; level-shifters are required if the host microcontroller uses 3.3 V GPIO. The shutdown (SHDN) and nap mode pins must be driven high after power-up to enable full-rate operation; the default state at power-up is shutdown, not active conversion.
Route the 4 LVDS output pairs (OUT1A, OUT1B through OUT4A, OUT4B) on an inner PCB layer with continuous ground reference above and below, and avoid routing them across split planes or near noisy digital buses. The frame (FR+/FR-) and clock output (CLKOUT+/CLKOUT-) signals should be length-matched to within 50 ps of each other. Keep the analog input traces (AIN1±, AIN2±, AIN3±, AIN4±) as short and symmetric as possible, and route them as a 100 Ω differential pair to the ADA4927 driver output.
Compliance Information
Lead-free Pb-free per #PBF and #TRPBF suffixes. RoHS compliance per Analog Devices product page. Halogen-free status not explicitly stated in verified data. AEC-Q100 not applicable - the part is commercial/industrial grade (C-suffix) with the I-suffix (LTC2171IUKG-14) being the industrial-temperature variant.
