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Analog Devices Inc. LTC2157IUP-12#PBF
- Part No.:
- LTC2157IUP-12#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 64-WFQFN Exposed Pad
- Datasheet:
-
LTC2157IUP-12#PBF.pdf
- Description:
- IC ADC 12BIT PIPELINED 64QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,799
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Product details
Overview
LTC2157IUP-12#PBF from Analog Devices (formerly Linear Technology) is a dual-channel, 12-bit, 250Msps analog-to-digital converter optimized for high-frequency undersampling in communications and instrumentation systems. It delivers 68.5dB SNR, 90dB SFDR, and 1.25GHz full-power bandwidth with DDR LVDS outputs, operating from a single 1.8V supply and supporting sleep/nap modes for power-sensitive designs.
For engineers reviewing the LTC2157IUP-12#PBF datasheet, LTC2157IUP-12#PBF pinout, LTC2157IUP-12#PBF application, or LTC2157IUP-12#PBF equivalent, this page provides verified specifications, package layout, real-world use cases, and validated alternative options for RF sampling, baseband digitization, and high-speed test equipment design.
Technical Context
The LTC2157IUP-12#PBF implements a pipelined ADC architecture with integrated sample-and-hold (S/H) front-end, correction logic, and DDR LVDS output drivers. Its 1.25GHz input bandwidth enables high-IF sampling up to 380MHz while maintaining 68.5dB SNR at 70MHz input - critical for cellular basestation receivers and software-defined radios.
It features configurable clock duty cycle stabilization, SPI-based serial configuration via CS/SCK/SDI/SDO, and dual independent analog channels (A/B) with differential inputs, internal/external reference selection (via SENSE pin), and programmable LVDS output current (1.75mA or 3.5mA). Pipeline latency is fixed at six clock cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit, no missing codes over temperature - guarantees monotonicity and full code coverage in closed-loop control or calibration systems. |
| Sampling Rate | 250Msps maximum - supports Nyquist-sampled IF signals up to 125MHz or high-undersampling ratios for RF direct-conversion architectures. |
| SNR @ 70MHz | 68.5dBFS typical - enables >11 effective bits of resolution for demanding signal integrity applications like medical imaging or radar pulse analysis. |
| SFDR @ 70MHz | 90dBFS typical (2nd/3rd harmonic) - suppresses spurious content critical for multi-carrier LTE/WiMAX receiver dynamic range. |
| Full-Power Bandwidth | 1.25GHz - allows clean digitization of wideband signals without external anti-alias filtering below 625MHz. |
| Power Consumption | 628mW total at 250Msps (309mA VDD + 40mA OVDD) - balances performance and thermal budget in dense FPGA-ADC interface boards. |
| Input Range | 1.5VP-P differential with 0.435•VDD common-mode (VCM) - simplifies driver stage design using standard RF amplifiers or baluns. |
Pinout & Package
64-lead (9mm × 9mm) plastic QFN package with exposed thermal pad (Pin 65 = GND), requiring soldering to PCB ground plane for thermal and electrical integrity. Pin pitch: 0.5mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pins 1,2,15,16,17,64) | Analog supply input | 1.8V ±0.1V analog rail; each group (1/2/64 and 15/16/17) requires local 0.1µF ceramic bypass to GND. |
| AINA+/AINA– (Pins 4,5) | Differential analog input, Channel A | Accepts 1.5VP-P differential signal; common-mode bias set by VCM pin (Pin 10). |
| ENC+/ENC– (Pins 19,20) | Differential encode clock input | Accepts sine wave, PECL, LVDS, TTL, or CMOS; rising/falling edge triggers conversion. |
| DA0_1+ / DA0_1– to DA10_11+ / DA10_11– (Pins 44–45,46–47,50–51,52–53,54–55,56–57) | DDR LVDS data outputs, Channel A | Each pair carries two time-multiplexed bits (even/odd) synchronized to CLKOUT+; 100Ω on-chip termination optional. |
| DB0_1+ / DB0_1– to DB10_11+ / DB10_11– (Pins 26–27,28–29,30–31,34–35,36–37,38–39) | DDR LVDS data outputs, Channel B | Identical timing and drive structure as Channel A; supports independent dual-channel acquisition. |
| CLKOUT+/CLKOUT– (Pins 40,41) | DDR data clock output | Phase-aligned with data edges; programmable delay relative to outputs via SPI register for timing margin optimization. |
| PAR/SER (Pin 63) | Programming mode select | Ground = serial mode (CS/SCK/SDI/SDO active); VDD = parallel mode (CS/SCK/SDI control limited functions). |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 12-bit ADC cores | Enables simultaneous sampling of I/Q paths or redundant signal chains without interleaving artifacts or skew compensation. |
| 68.5dB SNR at 250Msps | Supports >11 ENOB for high-fidelity digitization of 16-QAM/64-QAM baseband signals in SDR transceivers. |
| 1.25GHz full-power bandwidth | Permits direct RF sampling of L-band (1–2GHz) signals with minimal front-end filtering, reducing BOM and board area. |
| DDR LVDS outputs with programmable current | Reduces EMI and improves noise immunity vs. CMOS; 1.75mA mode cuts digital power by ~40% for battery-powered instruments. |
| SPI-configurable sleep/nap modes | Reduces power to <5mW (sleep) or 181mW (nap) - extends runtime in portable test gear and enables rapid wake-up for burst-mode acquisition. |
| Pin-compatible with 14-bit variants (LTC2157-14) | Allows performance scaling within same PCB layout - simplifies platform design across cost/performance tiers. |
Applications
| Cellular Basestation Receiver | Software Defined Radio (SDR) |
|---|---|
Use Scenario: Digitizing 70MHz IF signals from multi-carrier LTE FDD receivers with 20MHz channel bandwidth. IC Role / Device Role / Timing Role: Dual-channel ADC captures I/Q baseband streams with matched gain/phase and sub-100ps inter-channel skew. Use Value: 90dB SFDR prevents adjacent-channel interference; 68.5dB SNR ensures >30dB carrier-to-noise ratio for 256-QAM demodulation. |
Use Scenario: Real-time spectrum analysis and adaptive waveform generation in field-deployable cognitive radio platforms. IC Role / Device Role / Timing Role: High-speed digitizer feeding FPGA-based FFT engines and digital downconverters with deterministic 6-cycle pipeline latency. Use Value: 1.25GHz bandwidth enables direct sampling of UHF TV white space (470–698MHz); DDR LVDS eases FPGA interface timing closure. |
| Medical Ultrasound Beamformer | High-Speed Test & Measurement |
Use Scenario: Acquiring 10–20MHz echo return signals from phased-array transducers with >120dB dynamic range requirements. IC Role / Device Role / Timing Role: Low-noise, low-distortion ADC front-end for time-gain compensation (TGC) and beam synthesis processing. Use Value: 0.54LSBRMS transition noise minimizes quantization-induced speckle; 64-pin QFN fits compact probe electronics. |
Use Scenario: Embedded digitizer in automated test equipment capturing transient events (e.g., power supply ripple, switching glitches) at >100Msps. IC Role / Device Role / Timing Role: Precision acquisition engine with programmable nap mode for low-duty-cycle monitoring and fast wake-on-trigger response. Use Value: Sleep mode (<5mW) enables always-on monitoring; 250Msps rate resolves 4ns edges in power integrity analysis. |
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, JESD204B interface, 1.25W power - higher resolution and speed but requires serializer/deserializer FPGA IP and complex power sequencing. | Better suited for radar and wideband spectrum monitoring where >12-bit ENOB is mandatory; not drop-in due to interface and thermal constraints. | Select when system demands >12-bit ENOB at >300Msps and JESD204B infrastructure is already in place. |
| LTC2268IUJ-12#PBF | Single-channel, 12-bit, 105Msps, parallel CMOS outputs, 350mW - lower speed, simpler interface, no DDR or SPI config. | Ideal for cost-sensitive, lower-bandwidth applications like industrial data loggers or basic oscilloscope front-ends where dual-channel sync is unnecessary. | Choose for simplified layout, reduced FPGA pin count, and lower power where 105Msps sampling meets system requirements. |
Compared with AD9680BCPZ-500 and LTC2268IUJ-12#PBF, the LTC2157IUP-12#PBF uniquely balances 250Msps dual-channel performance, DDR LVDS simplicity, sub-630mW power, and SPI configurability - making it optimal for compact, thermally constrained SDR and instrumentation designs requiring precise inter-channel matching without JESD204B overhead.
Availability
LTC2157IUP-12#PBF is available at Aetrix Electronics and suitable for cellular basestation receiver modules, software-defined radio development platforms, and high-definition medical imaging systems requiring stable component supply across extended temperature ranges (–40°C to +85°C).
Supply support for LTC2157IUP-12#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 digital signal processing technologies, serving aerospace, industrial, automotive, and communications markets.
The LTC2157-12 family was designed specifically for high-dynamic-range, high-frequency digitization in communications infrastructure and test equipment - emphasizing SNR/SFDR performance, low power, and flexible digital interfacing.
FAQ
What is the operating temperature range for the LTC2157IUP-12#PBF?
The LTC2157IUP-12#PBF is rated for industrial operation from –40°C to +85°C, as indicated by the "I" grade in the part number and confirmed in the Absolute Maximum Ratings table. This makes it suitable for outdoor basestation equipment and ruggedized test instruments where ambient temperatures exceed commercial-grade limits.
Does the LTC2157IUP-12#PBF support both internal and external voltage references?
Yes, the LTC2157IUP-12#PBF supports dual reference modes: connecting the SENSE pin (Pin 7) to VDD selects the internal 1.25V reference and ±0.75V input range; applying 1.20–1.30V to SENSE selects an external reference and scales the input range to ±0.6 × VSENSE - enabling precision gain calibration in metrology applications.
How is the DDR LVDS output timing synchronized in the LTC2157IUP-12#PBF?
The LTC2157IUP-12#PBF uses the dedicated CLKOUT+/CLKOUT– outputs (Pins 40/41) to align DDR data transitions. Even bits (e.g., DA0, DA2) appear when CLKOUT+ is low; odd bits (e.g., DA1, DA3) appear when CLKOUT+ is high. The phase offset between CLKOUT+ and data edges is programmable via SPI register to optimize setup/hold margins at the FPGA receiver.
Can the LTC2157IUP-12#PBF be used in pin-compatible designs with the 14-bit LTC2157-14 series?
Yes, the LTC2157IUP-12#PBF shares identical 64-lead QFN packaging, pinout, and footprint with the LTC2157-14 family (e.g., LTC2157IUP-14#PBF), as explicitly stated in the Features section. This enables hardware reuse across performance tiers - only firmware and layout validation are required when upgrading resolution.
What power-saving modes does the LTC2157IUP-12#PBF offer, and how are they activated?
The LTC2157IUP-12#PBF offers two low-power states: Nap mode (181mW at 250Msps, activated via SPI register) and Sleep mode (<5mW, activated by disabling the encode clock). Both preserve register settings and allow fast wake-up - critical for battery-powered spectrum analyzers or energy-harvesting sensor nodes requiring intermittent high-speed capture.
LTC2157IUP-12#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 64-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 250M
- Number of Inputs:
- 2
- Input Type:
- Differential
- Data Interface:
- LVDS - Parallel
- 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:
- 64-QFN (9x9)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2157IUP-12#PBF FAQ
1.How can I place an order for LTC2157IUP-12#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2157IUP-12#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 LTC2157IUP-12#PBF reliable?
The price and inventory of LTC2157IUP-12#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2157IUP-12#PBF is usually 5 days.
3.What payment methods are accepted for LTC2157IUP-12#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2157IUP-12#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2157IUP-12#PBF?
LTC2157IUP-12#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2157IUP-12#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 LTC2157IUP-12#PBF?
For technical support, including LTC2157IUP-12#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2157IUP-12#PBF requirements.
6.How does Aetrix verify that LTC2157IUP-12#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2157IUP-12#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 LTC2157IUP-12#PBF meets industry standards.
7.What is the process for return or replacement of LTC2157IUP-12#PBF?
All LTC2157IUP-12#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2157IUP-12#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 LTC2157IUP-12#PBF part is unused and in its original packaging.
Return procedure for LTC2157IUP-12#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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