My Inquiry
My Account
Analog Devices Inc. LTC2251CUH#TRPBF
- Part No.:
- LTC2251CUH#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC2251CUH#TRPBF.pdf
- Description:
- IC ADC 10BIT PIPELINED 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,124
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC2251CUH#TRPBF from Analog Devices (formerly Linear Technology) is a 10-bit, 125Msps low-noise pipelined analog-to-digital converter optimized for high-frequency signal digitization in demanding communications and imaging systems. It operates from a single 3V supply (2.85V–3.4V), delivers 61.6dB SNR and 85dB SFDR at Nyquist, supports flexible ±0.5V to ±1V differential input range, and features integrated clock duty cycle stabilizer and shutdown modes.
For engineers reviewing the LTC2251CUH#TRPBF datasheet, LTC2251CUH#TRPBF pinout, LTC2251CUH#TRPBF application, or LTC2251CUH#TRPBF equivalent, this page provides verified specifications, validated pin functions, confirmed use cases in ultrasound and spectral analysis, and two technically documented alternative parts with explicit functional and application-level differences.
Technical Context
The LTC2251CUH#TRPBF implements a six-stage CMOS pipelined ADC architecture with 5-cycle pipeline latency and internal sample-and-hold featuring 640MHz full-power bandwidth. Its clock duty cycle stabilizer enables consistent AC performance across wide input clock duty cycles (30%–70%), and its flexible reference configuration (via SENSE pin) supports ±0.5V or ±1V differential input ranges using either internal 1.5V VCM or external references.
DC accuracy is characterized over temperature with ±0.6LSB INL and ±0.6LSB DNL (max), while dynamic performance includes 0.08LSBRMS transition noise and guaranteed no missing codes. Digital outputs are LVDS- or CMOS-compatible via configurable OVDD (0.5V–3.6V), and output format (offset binary or 2's complement) is selected via MODE pin voltage level.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit, no missing codes - ensures monotonic transfer function critical for measurement integrity. |
| Sampling Rate | 125Msps - enables digitization of signals up to 62.5MHz (Nyquist) without aliasing in wideband receivers. |
| SNR @ 70MHz | 61.5dB (typ) - defines minimum detectable signal amplitude above quantization + thermal noise floor. |
| SFDR @ 70MHz | 82dB (typ) - determines spurious-free dynamic range for multi-tone signal capture in comms systems. |
| Input Bandwidth | 640MHz full-power - supports direct RF sampling of L-band and lower S-band signals without IF translation. |
| Power Dissipation | 395mW @ 125Msps - balances high-speed performance with thermal management in compact PCB layouts. |
| Supply Voltage | VDD = 2.85V–3.4V, OVDD = 0.5V–3.6V - allows interface compatibility with 1.8V/2.5V/3.3V logic families. |
Pinout & Package
Package: 32-lead (5mm × 5mm) plastic QFN with exposed pad (Pin 33 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN+, AIN– | Differential analog input pair | Accepts ±0.5V or ±1V differential signal; common-mode bias set by VCM (1.5V) or external source. |
| REFH, REFL | ADC reference high/low terminals | Shorted pairs; require local 0.1µF + 2.2µF bypassing to stabilize reference voltage and reduce noise coupling. |
| CLK | Single-ended sampling clock input | Positive-edge triggered; supports duty cycle stabilizer when MODE pin is biased at 1/3 or 2/3 VDD. |
| SHDN, OE | Shutdown and output enable control | Four power states: normal (SHDN=L, OE=L), high-Z output (SHDN=L, OE=H), nap mode (SHDN=H, OE=L), shutdown (SHDN=H, OE=H). |
| D0–D9 | Parallel digital output bus | D9 = MSB; output voltage swing and logic threshold determined by OVDD (0.5V–3.6V); timing referenced to CLK. |
| MODE, SENSE | Configuration pins | MODE selects output format (offset binary/2's complement) and duty cycle stabilizer; SENSE sets input range (±0.5V/±1V) and reference source. |
| VCM | Internal 1.5V common-mode reference | Bypass to ground with ≥2.2µF capacitor; used as DC bias for differential drivers or transformer center taps. |
| OVDD, OGND | Digital output supply and ground | Independent from analog VDD/GND - enables level-shifting to match FPGA/ASIC I/O standards. |
Key Features
| Feature | Design Value |
|---|---|
| 640MHz full-power analog input bandwidth | Enables direct sampling of RF signals up to L-band (1–2GHz) with minimal front-end filtering. |
| Integrated clock duty cycle stabilizer | Eliminates need for external clock conditioning circuitry, reducing BOM count and layout complexity. |
| Flexible input range selection (±0.5V / ±1V) | Allows optimization of dynamic range vs. noise floor based on signal source impedance and driver capability. |
| Low 0.08LSBRMS transition noise | Minimizes code jitter in time-critical applications such as time-of-flight measurements and phase-sensitive detection. |
| Configurable output format (offset binary / 2's complement) | Matches native data formats of downstream DSPs or FPGAs without requiring real-time bit manipulation. |
Applications
| Ultrasound Imaging | Spectral Analysis |
|---|---|
Use Scenario: Digitizing echo return signals from piezoelectric transducers operating at 5–15MHz carrier frequencies with variable gain amplification. IC Role / Device Role / Timing Role: High-speed ADC capturing baseband I/Q or RF-sampled echoes with sub-ns aperture jitter to preserve phase coherence across channels. Use Value: 61.6dB SNR and 85dB SFDR ensure accurate tissue differentiation and clutter rejection in B-mode and Doppler processing. | Use Scenario: Real-time frequency-domain analysis of vibration signatures in industrial predictive maintenance systems using FFT-based algorithms. IC Role / Device Role / Timing Role: Front-end digitizer for wide instantaneous bandwidth capture (≥60MHz), feeding FPGA-based spectral engines. Use Value: 125Msps sampling and 640MHz input bandwidth support high-resolution bin spacing and fast update rates without undersampling artifacts. |
| Wireless Baseband Receiver | Portable Test Equipment |
Use Scenario: Direct-conversion receiver digitizing 20MHz LTE or 5G NR channel bandwidths in small-cell infrastructure or portable analyzers. IC Role / Device Role / Timing Role: ADC in zero-IF or low-IF architecture, interfacing with quadrature demodulators and digital downconverters. Use Value: Low power (395mW) and integrated reference simplify thermal design in fanless enclosures; flexible OVDD supports direct connection to 1.8V FPGA I/O banks. | Use Scenario: Handheld oscilloscopes or spectrum analyzers requiring high fidelity, battery-efficient signal acquisition up to 62.5MHz. IC Role / Device Role / Timing Role: Core digitizer enabling >100kSa/s real-time sampling with deep memory buffers and low-latency data streaming. Use Value: Shutdown and nap modes reduce standby current to 2mW or 15mW, extending battery life between charges without sacrificing wake-up speed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD9215BRUZ-125 | 10-bit, 125Msps; requires separate 1.8V digital supply; no integrated clock duty cycle stabilizer; higher typical power (475mW). | Requires external clock conditioning for non-50% duty cycles; less suitable for space-constrained designs needing minimal support components. | Select AD9215BRUZ-125 when interfacing with 1.8V-only logic domains and when external clock cleanup is already present. |
| LTC2253CUH#TRPBF | 12-bit, 125Msps; identical pinout and package; higher resolution but lower max SFDR (79dB vs. 85dB) at 70MHz; 450mW typical power. | Better for precision measurement where ENOB > 9.5 is required; trade-off is reduced spurious-free range in dense RF environments. | Select LTC2253CUH#TRPBF when system SNR requirement exceeds 65dB and harmonic distortion tolerance is relaxed. |
Compared with AD9215BRUZ-125, LTC2251CUH#TRPBF reduces component count via integrated duty cycle stabilization and dual-supply flexibility; compared with LTC2253CUH#TRPBF, it trades 2 bits of resolution for 6dB better SFDR and 55mW lower power-critical in RF-intensive or thermally constrained deployments.
Availability
LTC2251CUH#TRPBF is available at Aetrix Electronics and suitable for wireless infrastructure, medical ultrasound, and portable instrumentation requiring stable component supply, long-term lifecycle support, and traceable sourcing from authorized channels.
Supply support for LTC2251CUH#TRPBF 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 industrial, automotive, communications, and healthcare markets.
The LTC2251CUH#TRPBF belongs to ADI's high-speed precision ADC product line, designed specifically for applications demanding wide bandwidth, low noise, and low power in compact form factors-especially where direct RF sampling or high-fidelity baseband digitization is required.
FAQ
What is the maximum analog input frequency supported by the LTC2251CUH#TRPBF before significant SNR degradation occurs?
The LTC2251CUH#TRPBF maintains 61.5dB SNR up to 70MHz input frequency (–1dBFS, 2V range, 125Msps). At 140MHz, SNR drops to 61.4dB, indicating minimal degradation within its 640MHz full-power bandwidth. Performance beyond 70MHz remains usable for many wideband applications, though SFDR degrades more rapidly above 100MHz due to harmonic folding.
How does the MODE pin voltage setting affect the operation of the LTC2251CUH#TRPBF?
The MODE pin on the LTC2251CUH#TRPBF selects both output data format and clock duty cycle stabilizer state: GND = offset binary + stabilizer off; 1/3 VDD = offset binary + stabilizer on; 2/3 VDD = 2's complement + stabilizer on; VDD = 2's complement + stabilizer off. This dual-function design eliminates need for separate control lines, simplifying PCB routing and firmware configuration.
Can the LTC2251CUH#TRPBF operate with a 1.8V OVDD supply while maintaining full-speed performance?
Yes-the LTC2251CUH#TRPBF supports OVDD from 0.5V to 3.6V. At OVDD = 1.8V, VOH is guaranteed ≥1.79V and VOL ≤0.09V under 1.6mA load, fully compatible with 1.8V LVCMOS interfaces. Timing parameters (tD, tACC) remain valid per datasheet Table 5, enabling direct connection to 1.8V FPGAs without level shifters.
What is the purpose of the SENSE pin on the LTC2251CUH#TRPBF, and how does it impact input range?
The SENSE pin on the LTC2251CUH#TRPBF configures the ADC's full-scale input range: tied to VCM selects ±0.5V (1VP-P); tied to VDD selects ±1V (2VP-P); an external voltage between 0.5V and 1V sets ±VSENSE. This allows precise matching of input signal amplitude to ADC range-maximizing SNR without clipping-and eliminates need for external gain stages in many signal chains.
Does the LTC2251CUH#TRPBF require external decoupling capacitors, and if so, what values are recommended?
Yes-the LTC2251CUH#TRPBF requires localized decoupling: 0.1µF ceramic capacitors on all VDD (Pins 7, 32) and OVDD (Pin 21) pins; 0.1µF + 2.2µF ceramics on REFH/REFL (Pins 3–6); and ≥2.2µF on VCM (Pin 31). These values are specified in the datasheet to suppress switching noise, stabilize reference voltage, and maintain 640MHz input bandwidth performance.
LTC2251CUH#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 10
- Sampling Rate (Per Second):
- 125M
- Number of Inputs:
- 1
- Input Type:
- Differential, Single Ended
- Data Interface:
- 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:
- 2.85V ~ 3.4V
- Voltage - Supply, Digital:
- 2.85V ~ 3.4V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 32-QFN (5x5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2251CUH#TRPBF FAQ
1.How can I place an order for LTC2251CUH#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2251CUH#TRPBF 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 LTC2251CUH#TRPBF reliable?
The price and inventory of LTC2251CUH#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2251CUH#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2251CUH#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2251CUH#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2251CUH#TRPBF?
LTC2251CUH#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2251CUH#TRPBF 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 LTC2251CUH#TRPBF?
For technical support, including LTC2251CUH#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2251CUH#TRPBF requirements.
6.How does Aetrix verify that LTC2251CUH#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2251CUH#TRPBF 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 LTC2251CUH#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2251CUH#TRPBF?
All LTC2251CUH#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2251CUH#TRPBF, 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 LTC2251CUH#TRPBF part is unused and in its original packaging.
Return procedure for LTC2251CUH#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC2251CUH#TRPBF Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
