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Analog Devices Inc. LTC2123IUK#PBF
- Part No.:
- LTC2123IUK#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-WFQFN Exposed Pad
- Datasheet:
-
LTC2123IUK#PBF.pdf
- Description:
- IC ADC 14BIT PIPELINED 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,827
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Product details
Overview
LTC2123IUK#PBF from Analog Devices (formerly Linear Technology) is a dual-channel, simultaneous-sampling 14-bit analog-to-digital converter operating at 250Msps with JESD204B serial outputs. It delivers 70dBFS SNR and 90dBFS SFDR at 70MHz input, features 1.25GHz full-power analog bandwidth, consumes 864mW total power from a single 1.8V supply, and targets high-performance communications signal digitization in cellular base stations and software-defined radios.
For engineers reviewing the LTC2123IUK#PBF datasheet, LTC2123IUK#PBF pinout, LTC2123IUK#PBF application, or LTC2123IUK#PBF equivalent, key selection considerations include JESD204B lane configuration (2- or 4-lane), deterministic latency support (Subclass 1/2), clock divider functionality, CML output compliance (5Gbps), and temperature-rated operation from –40°C to +85°C.
Technical Context
The LTC2123IUK#PBF integrates two independent 14-bit ADC cores sharing a common DEVCLK input, each feeding a dedicated JESD204B serializer with 8B/10B encoding and CML drivers. Its analog front-end supports differential inputs up to ±0.75V (internal reference) or ±0.6×VSENSE (external reference), with 1.25V VREF and 0.435×VDD VCM outputs for precise biasing.
It implements configurable clock division (÷1 or ÷2), optional duty cycle stabilization, and deterministic latency via SYSREF (Subclass 1) or SYNC~ (Subclass 2) synchronization. The device supports both 2-lane (1 lane per ADC, 5Gbps/lane) and 4-lane (2 lanes per ADC, 2.5Gbps/lane) JESD204B configurations, with pipeline latencies of 13.5tS and 19.5tS, respectively.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit with no missing codes - guarantees monotonic transfer function and full code coverage across full dynamic range. |
| Sampling Rate | 250Msps maximum - enables Nyquist sampling of signals up to 125MHz or undersampling of RF carriers up to 1.25GHz. |
| SNR / SFDR | 70dBFS / 90dBFS at 70MHz - provides high-fidelity digitization for demanding wireless receiver applications requiring low noise floor and strong interferer rejection. |
| JESD204B Interface | Up to 5Gbps per lane, 2- or 4-lane mode - reduces PCB routing complexity versus parallel LVDS, supports FPGA/ASIC interfacing with deterministic latency. |
| Power Consumption | 864mW total at 250Msps, 1.8V VDD - enables high-speed conversion while maintaining thermal manageability in dense RF subsystems. |
| Analog Bandwidth | 1.25GHz full-power - allows direct RF sampling of L-band and S-band signals without external downconversion. |
| Operating Temperature | –40°C to +85°C (I-grade) - qualified for industrial and outdoor infrastructure deployments including macrocell base stations. |
Pinout & Package
Package: 48-lead (7mm × 7mm) plastic QFN with exposed pad (Pin 49 = GND), RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pins 1,12,13,23,24,37,38,48) | Analog power supply | 1.8V ±0.1V supply for ADC core and internal logic; requires local 0.1µF ceramic bypassing per group. |
| AINA+/AINA– (Pins 3,4), AINB+/AINB– (Pins 9,10) | Differential analog inputs | Two independent 1.5VP-P input pairs; high-impedance S/H with 1.25GHz bandwidth; referenced to VCM. |
| DEVCLK+/DEVCLK– (Pins 15,16) | Differential sampling clock input | Accepts sine wave, PECL, or LVDS; drives internal PLL and clock divider; determines sampling edge (falling in ÷1, rising in ÷2 mode). |
| SYSREF+/SYSREF– (Pins 18,19), SYNC~+/SYNC~– (Pins 21,22) | JESD204B synchronization inputs | SYSREF enables Subclass 1 deterministic latency; SYNC~ enables Subclass 2 initialization and comma generation. |
| CMLOUT_A0+/A0–, A1+/A1–, B0+/B0–, B1+/B1– (Pins 27–34) | JESD204B CML serial outputs | Four differential lanes supporting 2-lane (5Gbps) or 4-lane (2.5Gbps) configurations; require 50Ω to OVDD or 100Ω differential termination. |
| OVDD (Pins 25,26,35,36) | CML output driver supply | 1.2V–1.9V supply for CML drivers; independent of VDD; must be bypassed locally with 0.1µF capacitors. |
| CS/SDI/SCK/SDO (Pins 46,44,45,43) | Serial SPI interface | 1.8V–3.3V-tolerant 4-wire interface for register configuration and readback; SDO is open-drain requiring external pull-up. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 14-bit 250Msps ADC with simultaneous sampling | Enables coherent I/Q sampling and channel matching critical for MIMO and beamforming systems without inter-channel skew. |
| JESD204B subclass 1 and 2 support | Allows deterministic latency alignment across multiple converters in phased-array radar or multi-antenna baseband processing. |
| Configurable clock divider (÷1 or ÷2) and duty cycle stabilizer | Permits flexible clock sourcing - e.g., use 250MHz crystal with ÷1 for 250Msps, or 500MHz source with ÷2 - while maintaining performance over wide duty cycles. |
| Low-power sleep (2mW) and nap (468mW) modes | Reduces system power during idle periods in burst-mode communication protocols like TDD-LTE or 5G NR slot-based operation. |
| 1.25GHz full-power analog bandwidth with 75dB CMRR | Supports direct RF sampling of 3G/4G/5G carrier frequencies while rejecting common-mode noise from shared PCB traces or power planes. |
Applications
| Cellular Base Stations | Software Defined Radios |
|---|---|
Use Scenario: Digitizing I/Q baseband signals in massive MIMO remote radio heads with tight phase coherence requirements. IC Role / Device Role / Timing Role: Dual-channel ADC providing synchronized 250Msps sampling with deterministic latency for real-time beamforming calculations. Use Value: 90dBFS SFDR suppresses adjacent channel interference; JESD204B reduces FPGA pin count and routing congestion in compact RRH modules. |
Use Scenario: Wideband spectrum monitoring and agile waveform generation in military comms and electronic warfare platforms. IC Role / Device Role / Timing Role: High-bandwidth ADC enabling instantaneous frequency coverage from DC to 1.25GHz via undersampling. Use Value: 1.25GHz analog bandwidth eliminates need for external mixers; 70dBFS SNR ensures detection of low-level emitters in noisy RF environments. |
| Medical Imaging | Test and Measurement Instrumentation |
Use Scenario: Digitizing ultrasound echo signals in portable handheld scanners requiring high dynamic range and low power. IC Role / Device Role / Timing Role: Low-noise ADC capturing weak return echoes with minimal quantization distortion across wide gain ranges. Use Value: 864mW total power enables battery-operated designs; 14-bit resolution preserves tissue contrast detail in B-mode imaging. |
Use Scenario: High-speed oscilloscope front-end capturing transient events in 5G mmWave component validation. IC Role / Device Role / Timing Role: Precision ADC serving as acquisition engine with calibrated timing and jitter performance traceable to metrology standards. Use Value: 0.15psRMS aperture jitter ensures accurate time-domain reconstruction; JESD204B simplifies high-throughput data streaming to host memory. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed dual-channel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD9680BCPZ-500 | 14-bit, 500Msps dual ADC; JESD204B subclass 1 only; higher power (1.6W); wider input bandwidth (2.5GHz). | Required for >250MHz instantaneous bandwidth or higher sample rates; less suitable for thermally constrained portable designs. | Select when needing >250Msps or >1.25GHz analog bandwidth; verify FPGA JESD204B PHY compatibility and thermal margin. |
| LTC2263IUK#PBF | 16-bit, 105Msps dual ADC; parallel CMOS/LVDS outputs; no JESD204B; lower power (340mW); narrower bandwidth (700MHz). | Preferred for applications prioritizing resolution over speed, where PCB routing density is not limiting and deterministic latency is not required. | Select when SNR >75dBFS is critical and 105Msps suffices; avoid if migrating to JESD204B-based platforms or needing >125MHz Nyquist bandwidth. |
Compared with AD9680BCPZ-500 and LTC2263IUK#PBF, the LTC2123IUK#PBF uniquely balances 250Msps speed, 14-bit resolution, JESD204B flexibility (Subclass 1/2), and sub-1W power-making it optimal for mid-tier 5G infrastructure and portable test equipment where thermal, routing, and latency constraints intersect.
Availability
LTC2123IUK#PBF is available at Aetrix Electronics and suitable for cellular base station development, software-defined radio prototyping, and medical ultrasound system integration requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2123IUK#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, with deep expertise in precision data conversion and RF signal chain solutions.
The LTC2123IUK#PBF belongs to ADI's high-speed ADC product line, designed specifically for demanding communications infrastructure applications requiring wide bandwidth, low jitter, and JESD204B interoperability in thermally challenging environments.
FAQ
What is the guaranteed operating temperature range for the LTC2123IUK#PBF?
The LTC2123IUK#PBF is specified for continuous operation from –40°C to +85°C ambient temperature, meeting industrial-grade reliability requirements. This rating is confirmed by the "I" suffix in the part number and validated across all electrical specifications in the datasheet's "l"-marked parameters, including SNR, SFDR, and power consumption.
Does the LTC2123IUK#PBF support JESD204B subclass 2 deterministic latency?
Yes, the LTC2123IUK#PBF supports JESD204B subclass 2 via its SYNC~+ and SYNC~– inputs. A low-to-high transition on SYNC~ sampled at the rising edge of DEVCLK initializes the internal dividers and establishes deterministic latency, enabling precise multi-device synchronization in phased-array or multi-channel test systems.
What are the valid termination schemes for the CMLOUT pins on the LTC2123IUK#PBF?
The CMLOUT pins (e.g., CMLOUT_A0+, CMLOUT_A0–) on the LTC2123IUK#PBF support three termination methods: direct coupling to OVDD via 50Ω resistors, differential termination using a 100Ω resistor between complementary outputs, or AC coupling to another termination voltage with appropriate DC biasing - all compliant with JESD204B CML specifications.
Can the LTC2123IUK#PBF operate with an external reference applied to the SENSE pin?
Yes, the LTC2123IUK#PBF accepts an external reference between 1.2V and 1.3V on the SENSE pin to configure the input range to ±0.6 × VSENSE. When SENSE is tied to VDD, the device uses its internal 1.25V reference and defaults to a ±0.75V input range, as documented in the Analog Input section of the datasheet.
What is the minimum and maximum OVDD supply voltage for the LTC2123IUK#PBF CML outputs?
The OVDD supply for the LTC2123IUK#PBF CML outputs must be set between 1.2V and 1.9V, as specified in the Absolute Maximum Ratings and Power Requirements tables. Operation outside this range risks violating output voltage compliance or damaging the CML drivers, and is not supported across the full temperature range.
LTC2123IUK#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:
- 14
- Sampling Rate (Per Second):
- 250M
- Number of Inputs:
- 2
- Input Type:
- Differential
- Data Interface:
- JESD204B
- 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:
- 48-QFN (7x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2123IUK#PBF FAQ
1.How can I place an order for LTC2123IUK#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2123IUK#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 LTC2123IUK#PBF reliable?
The price and inventory of LTC2123IUK#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2123IUK#PBF is usually 5 days.
3.What payment methods are accepted for LTC2123IUK#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2123IUK#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2123IUK#PBF?
LTC2123IUK#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2123IUK#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 LTC2123IUK#PBF?
For technical support, including LTC2123IUK#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2123IUK#PBF requirements.
6.How does Aetrix verify that LTC2123IUK#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2123IUK#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 LTC2123IUK#PBF meets industry standards.
7.What is the process for return or replacement of LTC2123IUK#PBF?
All LTC2123IUK#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2123IUK#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 LTC2123IUK#PBF part is unused and in its original packaging.
Return procedure for LTC2123IUK#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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