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Analog Devices Inc. LTC2191IUKG#PBF
- Part No.:
- LTC2191IUKG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 52-WFQFN Exposed Pad
- Datasheet:
-
LTC2191IUKG#PBF.pdf
- Description:
- IC ADC 16BIT PIPELINED 52QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,417
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Product details
Overview
LTC2191IUKG#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, dual-channel, simultaneous-sampling analog-to-digital converter optimized for high-dynamic-range IF/RF digitization in communications infrastructure. It delivers 77dB SNR, 90dB SFDR, and ultralow 0.07psRMS jitter at 40Msps sampling rate, with ±2LSB INL and single 1.8V supply operation - enabling high-fidelity signal capture in cellular base stations and portable medical imaging systems.
For engineers reviewing the LTC2191IUKG#PBF datasheet, LTC2191IUKG#PBF pinout, LTC2191IUKG#PBF application, or LTC2191IUKG#PBF equivalent, key selection criteria include its 40Msps dual ADC performance, serial LVDS output configuration (1/2/4-lane), internal clock duty cycle stabilizer, shutdown/nap modes, and 52-pin QFN package with exposed thermal pad.
Technical Context
The LTC2191IUKG#PBF implements two independent 16-bit SAR-based ADC cores with simultaneous sampling, full-power bandwidth of 550MHz, and integrated sample-and-hold with 0.07psRMS acquisition jitter. Its digital interface uses programmable serial LVDS outputs with optional on-chip 100Ω termination and adjustable 1.75mA/3.5mA drive strength per lane.
Configuration is managed via SPI-compatible serial port (CS/SCK/SDI/SDO) or parallel mode using PAR/SER pin selection. The device supports differential or single-ended encode inputs, selectable input ranges (1–2VP-P), internal/external reference modes via SENSE pin, and precision matching between channels (±0.3% gain, ±1.5mV offset).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes over temperature - ensures full dynamic range utilization without code gaps. |
| Sampling Rate | 40Msps - matches mid-tier software-defined radio and multi-channel data acquisition timing requirements. |
| SNR / SFDR | 77dB SNR and 90dB SFDR at 70MHz input - enables clean digitization of wideband signals with minimal noise floor elevation. |
| Power Consumption | 146mW total at 40Msps (73mW per channel) - reduces thermal load in dense RF front-end assemblies. |
| Analog Supply | Single 1.8V (1.7–1.9V) VDD - simplifies power delivery and aligns with modern low-voltage FPGA/ASIC I/O domains. |
| Input Bandwidth | 550MHz full-power bandwidth - supports undersampling of IF signals up to 275MHz (Nyquist zone 2). |
| Jitter Performance | 0.07psRMS aperture jitter - critical for maintaining ENOB >14.5 bits at high IF frequencies. |
Pinout & Package
Package: 52-lead (7mm × 8mm) plastic QFN with exposed thermal pad (Pin 53 = GND), rated for –40°C to +85°C industrial operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCM1 (1) | Channel 1 common-mode bias output | Nominally VDD/2; used to set AIN1± common-mode voltage - requires 0.1µF bypass to GND. |
| AIN1+, AIN1– (3,4) | Differential analog input, Channel 1 | Accepts 1–2VP-P differential signal; CMRR = 80dB - enables high-rejection signal conditioning. |
| ENC+, ENC– (17,18) | Differential encode clock input | Supports PECL/LVDS/TTL/CMOS; internal duty cycle stabilizer maintains performance across 2–100% duty cycles. |
| OUT1A+/– to OUT1D+/– (37–44) | Serial LVDS data outputs, Channel 1 | Configurable 1/2/4-lane mode; each pair drives 100Ω differential load - reduces PCB trace count vs parallel interface. |
| FR+, FR– (31,32) | Frame start indicator outputs | Synchronizes data framing across both channels - essential for time-aligned dual-channel processing. |
| DCO+, DCO– (35,36) | Data clock output | LVDS clock synchronized to serialized data - eliminates need for external clock distribution in high-speed designs. |
| PAR/SER (10) | Programming mode select | Ground = serial SPI control; VDD = parallel logic control - allows flexible integration with host processor resources. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous dual-channel sampling | Ensures precise time alignment between channels for phase-coherent applications like beamforming and I/Q demodulation. |
| Programmable serial LVDS output lanes | Reduces interface pin count by up to 75% vs parallel output - saves PCB real estate and improves signal integrity at 40Msps. |
| Internal clock duty cycle stabilizer | Maintains AC performance even with asymmetric clock sources - eliminates need for external clock conditioning circuitry. |
| Shutdown and Nap modes | Reduces power to 1mW (shutdown) or 50mW (Nap) - extends battery life in portable medical and test equipment. |
| Channel matching (gain/offset) | ±0.3% gain match and ±1.5mV offset match - minimizes calibration overhead in multi-channel receiver systems. |
Applications
| Cellular Base Stations | Software-Defined Radios |
|---|---|
|
Use Scenario: Digitizing 70MHz IF signals from multi-carrier LTE receivers with adjacent channel interference rejection. IC Role / Device Role / Timing Role: Dual-channel ADC capturing synchronized I/Q data streams for digital downconversion and MIMO processing. Use Value: 90dB SFDR prevents intermodulation distortion from masking weak adjacent-channel signals during real-time spectrum analysis. |
Use Scenario: Reconfigurable RF front-end in military comms radios supporting multiple waveforms (e.g., SINCGARS, HF, SATCOM). IC Role / Device Role / Timing Role: High-fidelity digitizer enabling adaptive filtering and waveform-specific DSP algorithms on FPGA. Use Value: 77dB SNR preserves modulation accuracy for 256-QAM and OFDM symbols under varying RF conditions. |
| Portable Medical Imaging | Multi-Channel Data Acquisition |
|
Use Scenario: Ultrasound beamformer receiving echo signals from phased-array transducers with time-of-flight precision. IC Role / Device Role / Timing Role: Simultaneous sampling ADC providing time-aligned samples across 16+ receive channels for digital beam steering. Use Value: 0.07psRMS jitter enables sub-micron spatial resolution in B-mode imaging without hardware interpolation. |
Use Scenario: High-channel-count vibration monitoring system for predictive maintenance on rotating machinery. IC Role / Device Role / Timing Role: Dual ADC acquiring synchronized acceleration and temperature sensor data at 40ksps per channel. Use Value: ±2LSB INL ensures accurate amplitude measurement of harmonic content for fault signature analysis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel, 16-bit ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD9269-40EBZ | 40Msps, 16-bit, dual-channel, but uses parallel CMOS output (not LVDS); higher power (360mW) and larger 64-lead LFCSP package. | Lacks integrated duty cycle stabilizer and serial LVDS - requires external clock cleanup and more PCB routing. | Choose when legacy parallel interface compatibility or higher input bandwidth (750MHz) is prioritized over power and layout efficiency. |
| LTC2261IUH#PBF | 16-bit, 40Msps, single-channel only; identical QFN-48 package and 1.8V supply, but no dual-sampling or frame synchronization. | No channel-to-channel timing correlation - unsuitable for I/Q or beamforming where phase coherence is required. | Choose for cost-sensitive single-channel applications where dual-channel functionality is unnecessary. |
Compared with AD9269-40EBZ and LTC2261IUH#PBF, the LTC2191IUKG#PBF uniquely combines dual-channel simultaneity, serial LVDS output, and ultra-low jitter in a thermally enhanced 52-pin QFN - making it optimal for space-constrained, phase-critical RF digitization where power and layout efficiency are design drivers.
Availability
LTC2191IUKG#PBF is available at Aetrix Electronics and suitable for cellular base stations, portable medical imaging systems, and software-defined radios requiring stable component supply across extended industrial temperature ranges.
Supply support for LTC2191IUKG#PBF 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 communications, industrial, automotive, and healthcare markets.
The LTC2191IUKG#PBF belongs to ADI's high-speed precision ADC product line, engineered specifically for demanding RF/IF digitization in infrastructure and portable instrumentation where dynamic range, timing fidelity, and power efficiency are co-optimized.
FAQ
What is the maximum sampling rate supported by the LTC2191IUKG#PBF?
The LTC2191IUKG#PBF is rated for a maximum sampling rate of 40Msps, as confirmed in its ordering information and electrical specifications table. This speed grade distinguishes it from the LTC2192 (65Msps) and LTC2190 (25Msps) within the same family. Operation above 40Msps is not guaranteed and may degrade SNR, SFDR, or cause timing violations in the serial LVDS interface.
Does the LTC2191IUKG#PBF support internal reference mode, and how is it configured?
Yes, the LTC2191IUKG#PBF supports internal reference mode. It is enabled by connecting the SENSE pin (Pin 50) to VDD, which selects a ±1V input range and activates the internal 1.25V reference (VREF). The internal reference exhibits ±25ppm/°C drift and 1.225–1.275V output tolerance - sufficient for most communications and instrumentation applications without external reference circuitry.
How does the serial LVDS output configuration work on the LTC2191IUKG#PBF?
The LTC2191IUKG#PBF supports 1-, 2-, or 4-lane serial LVDS output per channel, selected via SPI register writes or parallel logic (CS/SCK). In 4-lane mode, each channel outputs four bits per sample period (e.g., OUT1A–/+, OUT1B–/+, etc.), reducing data rate per lane to 40Mbps per bit - easing PCB routing and signal integrity challenges compared to parallel interfaces.
What thermal management considerations apply to the LTC2191IUKG#PBF?
The LTC2191IUKG#PBF uses a 52-pin QFN with an exposed thermal pad (Pin 53 = GND) that must be soldered directly to a PCB ground plane using multiple thermal vias. Its θJA is specified at 29°C/W; for reliable operation at full 146mW dissipation in industrial ambient (85°C), a minimum 250mm² copper pour with ≥6 thermal vias is recommended to maintain junction temperature below 150°C.
Can the LTC2191IUKG#PBF operate with single-ended encode inputs?
Yes, the LTC2191IUKG#PBF supports single-ended encode operation by tying ENC– (Pin 18) to GND and driving ENC+ (Pin 17) with a 1.8V square wave or sine wave. In this mode, jitter increases slightly to 0.09psRMS (vs. 0.07psRMS differential), but full 40Msps operation remains supported - useful when clock source constraints preclude differential signaling.
LTC2191IUKG#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 52-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 40M
- Number of Inputs:
- 2
- Input Type:
- Differential
- Data Interface:
- LVDS - Serial
- 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:
- 52-QFN (7x8)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2191IUKG#PBF FAQ
1.How can I place an order for LTC2191IUKG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2191IUKG#PBF 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 LTC2191IUKG#PBF reliable?
The price and inventory of LTC2191IUKG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2191IUKG#PBF is usually 5 days.
3.What payment methods are accepted for LTC2191IUKG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2191IUKG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2191IUKG#PBF?
LTC2191IUKG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2191IUKG#PBF 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 LTC2191IUKG#PBF?
For technical support, including LTC2191IUKG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2191IUKG#PBF requirements.
6.How does Aetrix verify that LTC2191IUKG#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2191IUKG#PBF 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 LTC2191IUKG#PBF meets industry standards.
7.What is the process for return or replacement of LTC2191IUKG#PBF?
All LTC2191IUKG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2191IUKG#PBF, 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 LTC2191IUKG#PBF part is unused and in its original packaging.
Return procedure for LTC2191IUKG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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