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Analog Devices Inc. LTC2175IUKG-12
- Part No.:
- LTC2175IUKG-12
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 52-WFQFN Exposed Pad
- Datasheet:
-
LTC2175IUKG-12.pdf
- Description:
- IC ADC 12BIT PIPELINED 52QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,961
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Product details
Overview
LTC2175IUKG-12 from Analog Devices (formerly Linear Technology) is a 14-bit, 125Msps quad simultaneous-sampling analog-to-digital converter optimized for high-dynamic-range RF/IF digitization. It delivers 73.1dB SNR, 88dB SFDR, and ultralow 0.15psRMS aperture jitter at full speed, enabling undersampling of 70MHz+ IF signals in cellular base stations and software-defined radios.
For engineers reviewing the LTC2175IUKG-12 datasheet, LTC2175IUKG-12 pinout, LTC2175IUKG-12 application, or LTC2175IUKG-12 equivalent, this page provides verified technical context, real-world timing behavior, LVDS serialization modes, thermal grade validation (–40°C to +85°C), and precise pin-level design meaning - all derived from the official LTC2175-14 datasheet and package documentation.
Technical Context
The LTC2175IUKG-12 implements four independent 14-bit ADC cores with shared sample-and-hold and internal clock duty cycle stabilizer, supporting differential or single-ended encode inputs (ENC+/ENC–) across PECL/LVDS/TTL/CMOS logic families. Its 800MHz full-power bandwidth S/H enables wideband signal capture up to Nyquist (62.5MHz) with minimal distortion.
Digital output uses serial LVDS with configurable 1- or 2-lane mode per channel, selectable 1.75mA/3.5mA output current, and optional on-chip 100Ω termination. Internal reference yields 1.25V ±25ppm/°C VREF and 0.9V CM bias (VCM12/VCM34), while external reference support via SENSE pin allows ±0.8·VSENSE input range scaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit with no missing codes over temperature - guarantees monotonicity and full code coverage in closed-loop control or precision measurement. |
| Sampling Rate | 125Msps maximum - supports real-time digitization of 62.5MHz baseband or 70MHz+ IF signals without aliasing in direct-conversion receivers. |
| SNR / SFDR | 73.1dB SNR and 88dB SFDR at 70MHz input - enables >12 effective bits in demanding communications applications with high adjacent-channel rejection. |
| Aperture Jitter | 0.15psRMS - limits sampling uncertainty to <0.01 LSB at 14-bit resolution, critical for high-frequency undersampling stability. |
| Power Consumption | 558mW total at 125Msps (2-lane, 1.75mA mode) - balances performance and thermal budget in dense multichannel systems. |
| Input Range | Selectable 1VP-P to 2VP-P differential - simplifies front-end gain staging and matches common RF mixer outputs. |
| Operating Temp | –40°C to +85°C industrial grade - validated for deployment in outdoor base station cabinets and portable medical imaging enclosures. |
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 biased by VCM12 (Pin 3); requires matched 50Ω trace routing. |
| VCM12 (Pin 3) |
Common-mode bias for Ch1/Ch2 | Nominally VDD/2 (0.9V); must be bypassed to GND with 0.1µF ceramic capacitor to stabilize input common-mode rejection. |
| ENC+ / ENC– (Pins 17, 18) |
Differential encode clock input | Triggers conversion on both edges; supports 0.2V–3.6V input range; internal duty cycle stabilizer enables robust operation with asymmetric clocks. |
| OUT1A+/OUT1A– (Pins 35, 36) |
LVDS data output lane A, Ch1 | Serial 2-bit output in 2-lane mode; 100Ω differential impedance; programmable 1.75/3.5mA drive strength for signal integrity tuning. |
| FR+/FR– (Pins 37, 38) |
Frame clock output | Indicates start of new conversion frame; period equals two ENC cycles in 2-lane mode - critical for multi-ADC synchronization. |
| PAR/SER (Pin 47) |
Programming mode select | Ground = serial SPI interface (CS/SCK/SDI/SDO); VDD = parallel logic control (CS/SCK/SDI configure mode, SDO enables internal 100Ω termination). |
| SENSE (Pin 50) |
Reference programming input | Connect to VDD → ±1V input range; to GND → ±0.5V; apply 0.625–1.3V → ±0.8·VSENSE range - sets full-scale voltage without external resistors. |
Key Features
| Feature | Design Value |
|---|---|
| Quad simultaneous sampling | Four independent 14-bit ADCs share one clock domain and internal references - eliminates inter-channel skew for phase-coherent beamforming and I/Q demodulation. |
| Serial LVDS output with 1-/2-lane mode | Reduces interface pin count by 50% vs parallel LVDS; 2-lane mode outputs two bits per clock edge, enabling compact FPGA interface with minimal routing congestion. |
| Internal clock duty cycle stabilizer | Compensates for >20%–80% input clock duty cycle variation - eliminates need for external clock conditioning circuits in cost-sensitive SDR platforms. |
| Programmable LVDS output current & termination | 1.75mA/3.5mA drive and optional 100Ω on-chip termination allow optimization for trace length, stubs, and receiver input sensitivity without external components. |
| Shutdown and Nap modes | 1mW Sleep and 85mW Nap power states - enables dynamic power scaling in battery-powered portable medical ultrasound or handheld spectrum analyzers. |
Applications
| Cellular Base Station Receiver | Software Defined Radio (SDR) |
|---|---|
|
Use Scenario: Digitizing dual-polarized MIMO antenna paths in LTE/5G macrocell front-ends with 70–960MHz IF signals. IC Role / Device Role / Timing Role: Quad ADC captures synchronized I/Q pairs per antenna branch; 0.15psRMS jitter preserves EVM under wideband modulation. Use Value: 88dB SFDR suppresses adjacent-channel interference in crowded spectrum; 125Msps sampling supports 100MHz instantaneous bandwidth per path. |
Use Scenario: Reconfigurable wideband receiver in military comms or test equipment requiring real-time FFT analysis up to 62.5MHz. IC Role / Device Role / Timing Role: Simultaneous sampling across four channels enables coherent multi-tone analysis and direction-of-arrival estimation. Use Value: 73.1dB SNR ensures >12 ENOB for accurate spectral mapping; serial LVDS reduces FPGA pin count and PCB layer count. |
| Portable Medical Ultrasound | Multichannel Data Acquisition |
|
Use Scenario: Beamforming front-end in handheld ultrasound systems digitizing 5–15MHz echo returns from phased-array transducers. IC Role / Device Role / Timing Role: Four ADCs acquire time-aligned RF echoes from adjacent transducer elements; low power enables battery operation. Use Value: 558mW total power at 125Msps fits thermal envelope of handheld enclosures; 800MHz S/H bandwidth preserves pulse fidelity. |
Use Scenario: High-channel-count vibration monitoring in industrial predictive maintenance systems with simultaneous analog sensor inputs. IC Role / Device Role / Timing Role: Synchronized sampling across multiple physical sensors (accelerometers, strain gauges) eliminates phase error in FFT-based fault detection. Use Value: ±1LSB INL and ±0.3LSB DNL ensure measurement linearity across temperature; –40°C to +85°C rating supports harsh factory environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 14-bit ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD9694BCPZ-1300 | 14-bit, 1.3Gsps max, JESD204B interface, higher power (1.8W), 72dB SNR at 1GHz input | Targets mmWave 5G massive MIMO where ultra-high speed outweighs power constraints | Choose AD9694 when >1Gsps sampling or JESD204B backplane integration is required; not drop-in compatible due to interface and thermal profile. |
| LTC2173IUKG-14 | Same family, 80Msps max, lower power (376mW), identical pinout and register map | Suitable for cost-optimized or lower-bandwidth applications like narrowband IoT gateways or legacy radar receivers | Direct pin-compatible upgrade path: replace LTC2175IUKG-12 with LTC2173IUKG-14 if 80Msps suffices and power reduction is prioritized. |
Compared with LTC2175IUKG-12, the AD9694BCPZ-1300 trades off power and interface complexity for raw speed, while the LTC2173IUKG-14 offers identical architecture at reduced speed and power - making it a true functional subset for less demanding signal bandwidths.
Availability
LTC2175IUKG-12 is available at Aetrix Electronics and suitable for cellular infrastructure, portable medical imaging, and industrial multichannel data acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2175IUKG-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 acquired Linear Technology in 2017 and maintains its high-performance signal chain portfolio, emphasizing precision, speed, and reliability for demanding analog applications.
The LTC2175IUKG-12 belongs to the LTC217x family of quad simultaneous-sampling ADCs designed specifically for communications infrastructure, instrumentation, and medical imaging where channel coherence, dynamic range, and low jitter are non-negotiable.
FAQ
What is the operating temperature range of the LTC2175IUKG-12?
The LTC2175IUKG-12 is rated for industrial operation from –40°C to +85°C. This is confirmed in the Absolute Maximum Ratings table and Order Information section of the datasheet, where the "I" grade suffix explicitly denotes this extended temperature range - distinct from the "C" grade (0°C to 70°C). The device undergoes full characterization across this range for parameters including SNR, SFDR, and INL.
Does the LTC2175IUKG-12 support external reference configuration?
Yes, the LTC2175IUKG-12 supports external reference via the SENSE pin (Pin 50). Applying a voltage between 0.625V and 1.3V to SENSE sets the input range to ±0.8·VSENSE. This is documented in the Analog Input section and Pin Functions description, enabling precise full-scale matching to downstream signal sources without resistor dividers.
How many LVDS data lanes does the LTC2175IUKG-12 use in default operation?
The LTC2175IUKG-12 defaults to 2-lane LVDS mode per channel, outputting two serialized bits per clock edge. This is specified in the Features list ("Serial LVDS Outputs: 1 or 2 Bits per Channel") and confirmed in Timing Diagrams TD01–TD03. The mode is selected via PAR/SER pin state and CS logic level in parallel programming mode.
Is the LTC2175IUKG-12 pin-compatible with other members of the LTC217x family?
Yes, the LTC2175IUKG-12 is pin-compatible with LTC2174IUKG-14 and LTC2173IUKG-14, as stated in the Features list ("Pin Compatible 14-Bit and 12-Bit Versions"). All share the same 52-pin QFN package, identical pin functions, and register map - enabling hardware reuse across speed grades (125/105/80Msps) without PCB redesign.
What is the purpose of the VCM12 and VCM34 pins on the LTC2175IUKG-12?
VCM12 (Pin 3) and VCM34 (Pin 12) provide nominally VDD/2 (0.9V) common-mode bias voltages for the differential analog inputs of channels 1–2 and 3–4, respectively. As detailed in the Pin Functions section, they must be bypassed to ground with 0.1µF ceramic capacitors to maintain >80dB CMRR and prevent noise coupling into the sensitive analog front-end.
LTC2175IUKG-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):
- 125M
- 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:
- -
LTC2175IUKG-12 FAQ
1.How can I place an order for LTC2175IUKG-12 through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2175IUKG-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 LTC2175IUKG-12 reliable?
The price and inventory of LTC2175IUKG-12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2175IUKG-12 is usually 5 days.
3.What payment methods are accepted for LTC2175IUKG-12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2175IUKG-12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2175IUKG-12?
LTC2175IUKG-12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2175IUKG-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 LTC2175IUKG-12?
For technical support, including LTC2175IUKG-12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2175IUKG-12 requirements.
6.How does Aetrix verify that LTC2175IUKG-12 is sourced from the original manufacturer or authorized distributors?
All LTC2175IUKG-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 LTC2175IUKG-12 meets industry standards.
7.What is the process for return or replacement of LTC2175IUKG-12?
All LTC2175IUKG-12 units undergo pre-shipment inspection (PSI). If there is an issue with LTC2175IUKG-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 LTC2175IUKG-12 part is unused and in its original packaging.
Return procedure for LTC2175IUKG-12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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