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Analog Devices Inc. LTC2161IUK#PBF
- Part No.:
- LTC2161IUK#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-WFQFN Exposed Pad
- Datasheet:
-
LTC2161IUK#PBF.pdf
- Description:
- IC ADC 16BIT PIPELINED 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:608
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Product details
Overview
LTC2161IUK#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, 40Msps low-power analog-to-digital converter optimized for high-frequency signal digitization in communications infrastructure. It delivers 77dB SNR, 90dB SFDR, and ultralow 0.07psRMS jitter, enabling undersampling of IF signals up to 140MHz in cellular base stations and software-defined radios.
For engineers reviewing the LTC2161IUK#PBF datasheet, LTC2161IUK#PBF pinout, LTC2161IUK#PBF application, or LTC2161IUK#PBF equivalent, key selection criteria include its –40°C to +85°C industrial temperature grade, 48-lead 7mm × 7mm QFN package with exposed thermal pad, configurable CMOS/DDR-CMOS/DDR-LVDS outputs, and SPI-based configuration for clock duty cycle stabilization and output randomization.
Technical Context
The LTC2161IUK#PBF integrates a 550MHz full-power bandwidth sample-and-hold amplifier with a 16-bit ADC core, supporting differential or single-ended encode inputs (ENC+/ENC–) and selectable analog input ranges (1VP-P to 2VP-P). Its architecture enables direct RF sampling at IF frequencies without external amplification or filtering in demanding wide-dynamic-range applications.
Digital interface flexibility includes serial SPI programming (via CS/SCK/SDI/SDO) and parallel mode control (via PAR/SER), while power management features-Shutdown, Nap (10mW), and Sleep (1mW) modes-support dynamic power scaling. Output drivers support OVDD from 1.2V to 1.8V (CMOS) or 1.7V–1.9V (LVDS), with on-chip 100Ω LVDS termination enabled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes over temperature-ensures monotonicity and precision across full industrial range. |
| Sampling Rate | 40Msps-matches mid-tier SDR and medical imaging data acquisition throughput requirements. |
| SNR / SFDR | 77dB SNR and 90dB SFDR at 70MHz input-enables high-fidelity digitization of narrowband and wideband signals. |
| Power Dissipation | 63mW typical at 40Msps with CMOS outputs-reduces thermal load and simplifies PCB cooling in dense RF modules. |
| Analog Supply | Single 1.8V (1.7V–1.9V) VDD-eliminates need for multiple analog rails and eases power supply design. |
| Input Bandwidth | 550MHz full-power bandwidth-supports direct sampling of L-band and S-band IF signals without external amplifiers. |
| Jitter | 0.07psRMS aperture jitter-minimizes noise floor degradation during undersampling of high-frequency carriers. |
Pinout & Package
Package: 48-lead (7mm × 7mm) plastic QFN with exposed thermal pad (Pin 49 = GND), rated for –40°C to +85°C operation. Requires soldering of exposed pad to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCM (1) | Common-mode bias output | Provides stable VDD/2 reference (±25mV) to bias differential analog inputs; requires 0.1µF bypass to GND. |
| AIN+, AIN– (2,3) | Differential analog input pair | Accepts 1VP-P to 2VP-P differential signal; common-mode voltage set by VCM or external source via SENSE pin. |
| ENC+, ENC– (15,16) | Differential encode clock inputs | Supports PECL/LVDS/TTL/CMOS clocks; ENC– tied to GND enables single-ended mode; duty cycle stabilizer optional. |
| PAR/SER (9) | Programming mode select | Ground = serial SPI mode (full configuration); VDD = parallel mode (limited control via CS/SCK/SDI). |
| D0–D15 (21–24,36–40) | Parallel digital data outputs | Configurable as full-rate CMOS, DDR-CMOS, or DDR-LVDS; output swing set by OVDD (1.2V–1.8V for CMOS). |
| CS, SCK, SDI, SDO (17–19,44) | SPI interface signals | Enable register read/write for output format, randomizer, nap/sleep, and clock stabilizer; SDO is open-drain requiring 2kΩ pull-up. |
Key Features
| Feature | Design Value |
|---|---|
| Optional clock duty cycle stabilizer | Maintains high AC performance across wide input clock duty cycles (2–500ns high/low time), eliminating external clock conditioning. |
| Data output randomizer | Reduces deterministic spectral spurs caused by periodic digital switching, improving SFDR in narrowband receiver applications. |
| Three power states | Full operation (63mW), Nap (10mW), Sleep (1mW)-enables rapid power cycling in battery-powered or burst-mode systems. |
| Flexible reference configuration | Supports internal 1.25V reference or external reference (0.625V–1.3V) via SENSE pin, enabling precise gain calibration and system-level matching. |
| On-chip LVDS termination | 100Ω differential termination activated when OVDD = 1.8V-removes need for external resistors and saves board space. |
Applications
| Cellular Base Station Receiver | Software Defined Radio (SDR) |
|---|---|
|
Use Scenario: Digitizing 70MHz IF signals from multi-carrier GSM/UMTS/LTE front-ends in macrocell and small-cell base stations. IC Role / Device Role / Timing Role: High-speed ADC capturing wide instantaneous bandwidth with minimal quantization noise and harmonic distortion. Use Value: 90dB SFDR prevents adjacent-channel interference; 0.07psRMS jitter preserves EVM in 256-QAM waveforms. |
Use Scenario: Reconfigurable RF sampling in military and commercial SDR platforms operating across HF to S-band. IC Role / Device Role / Timing Role: Core digitizer enabling real-time spectrum analysis, adaptive filtering, and waveform synthesis. Use Value: 550MHz analog bandwidth supports direct sampling up to 250MHz; SPI programmability allows runtime mode switching. |
| Portable Medical Ultrasound | Multichannel Data Acquisition |
|
Use Scenario: Beamforming front-end in handheld ultrasound systems digitizing 5–15MHz echo returns from piezoelectric transducers. IC Role / Device Role / Timing Role: Low-noise, low-power ADC providing high dynamic range for weak acoustic signal capture. Use Value: 77dB SNR resolves subtle tissue contrast; 16-bit resolution enables >80dB dynamic range per channel. |
Use Scenario: Simultaneous sampling of multiple sensor channels (vibration, strain, temperature) in industrial condition monitoring systems. IC Role / Device Role / Timing Role: Precision digitizer synchronizing distributed analog inputs with deterministic latency (6.5-cycle pipeline). Use Value: ±2LSB INL ensures measurement linearity across temperature; Nap mode reduces idle power in multi-ADC arrays. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-performance ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD9268BCPZ-80 | 16-bit, 80Msps; higher speed but 105mW power; requires dual 1.8V/3.3V supplies; no integrated clock stabilizer. | Better suited for wideband radar or high-throughput test equipment where sampling rate >40Msps is mandatory. | Select when system demands >40Msps and can accommodate higher power and complex supply sequencing. |
| ADS5463IPFP | 13-bit, 500Msps; much higher speed but lower resolution; 1.5W power; only LVDS outputs; no SPI configuration. | Targeted at broadband communications and electronic warfare where raw speed outweighs ENOB requirements. | Choose only if application prioritizes Nyquist-rate sampling above 200MHz and tolerates 13-bit effective resolution. |
Compared with AD9268BCPZ-80 and ADS5463IPFP, the LTC2161IUK#PBF offers optimal balance of resolution, jitter, and power efficiency at 40Msps-making it uniquely suitable for thermally constrained, medium-bandwidth communications and instrumentation where 16-bit fidelity and configurability are critical.
Availability
LTC2161IUK#PBF is available at Aetrix Electronics and suitable for cellular infrastructure, portable medical imaging, and multichannel data acquisition systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC2161IUK#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and DSP solutions for precision instrumentation, communications, and industrial applications.
The LTC2161IUK#PBF belongs to Linear's ultra-low-jitter, low-power ADC family designed specifically for undersampling architectures in wireless infrastructure, medical imaging, and high-fidelity test equipment.
FAQ
What is the maximum analog input frequency supported by the LTC2161IUK#PBF?
The LTC2161IUK#PBF features a 550MHz full-power bandwidth sample-and-hold amplifier, enabling reliable digitization of analog inputs up to 140MHz at –1dBFS while maintaining 77dB SNR and 90dB SFDR. This makes the LTC2161IUK#PBF suitable for direct IF sampling in L-band and S-band receivers without external amplification.
Does the LTC2161IUK#PBF support both differential and single-ended clock inputs?
Yes, the LTC2161IUK#PBF supports both configurations: ENC+ and ENC– accept differential inputs (LVDS, PECL, etc.), and ENC– can be tied to GND to enable single-ended operation with TTL/CMOS-compatible ENC+ signals. The device maintains 0.07psRMS jitter in differential mode and 0.09psRMS in single-ended mode, as specified in the datasheet.
How does the SPI interface of the LTC2161IUK#PBF enable configuration of output modes?
The LTC2161IUK#PBF uses its SPI port (CS/SCK/SDI/SDO) to configure output format (CMOS/DDR-CMOS/DDR-LVDS), enable/disable the data randomizer and clock duty cycle stabilizer, and enter Nap or Sleep modes. Configuration registers are accessible only when PAR/SER is grounded, allowing full digital control without requiring hardware pin strapping.
What is the purpose of the VCM pin on the LTC2161IUK#PBF, and how should it be used?
The VCM pin (Pin 1) on the LTC2161IUK#PBF provides a buffered, low-impedance (4Ω) common-mode bias voltage nominally equal to VDD/2 (±25mV). It must be bypassed to GND with a 0.1µF ceramic capacitor and used to bias the AIN+/AIN– differential input pair-ensuring optimal linearity, CMRR (>80dB), and dynamic range across temperature.
Can the LTC2161IUK#PBF operate with an external voltage reference, and what is the valid range?
Yes, the LTC2161IUK#PBF supports external reference operation via the SENSE pin (Pin 46), accepting voltages from 0.625V to 1.300V. When used, the external reference sets the full-scale range and improves system-level gain matching and temperature stability versus the internal 1.25V reference, which has ±30ppm/°C drift.
LTC2161IUK#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 48-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 40M
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- LVDS - Parallel, Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- Pipelined
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 1.7V ~ 1.9V
- Voltage - Supply, Digital:
- 1.7V ~ 1.9V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 48-QFN (7x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2161IUK#PBF FAQ
1.How can I place an order for LTC2161IUK#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2161IUK#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 LTC2161IUK#PBF reliable?
The price and inventory of LTC2161IUK#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2161IUK#PBF is usually 5 days.
3.What payment methods are accepted for LTC2161IUK#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2161IUK#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2161IUK#PBF?
LTC2161IUK#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2161IUK#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 LTC2161IUK#PBF?
For technical support, including LTC2161IUK#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2161IUK#PBF requirements.
6.How does Aetrix verify that LTC2161IUK#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2161IUK#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 LTC2161IUK#PBF meets industry standards.
7.What is the process for return or replacement of LTC2161IUK#PBF?
All LTC2161IUK#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2161IUK#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 LTC2161IUK#PBF part is unused and in its original packaging.
Return procedure for LTC2161IUK#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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