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Analog Devices Inc. LTC2237IUH#PBF
- Part No.:
- LTC2237IUH#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC2237IUH#PBF.pdf
- Description:
- IC ADC 10BIT PIPELINED 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,669
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Product details
Overview
LTC2237IUH#PBF from Analog Devices (formerly Linear Technology) is a 10-bit, 40Msps low-noise pipelined analog-to-digital converter optimized for high-dynamic-range signal digitization in communications and imaging systems. It operates from a single 3V supply (2.7V–3.4V), delivers 61.8dB SNR and 85dB SFDR at Nyquist, supports flexible ±0.5V to ±1V differential input range, and features a 575MHz full-power bandwidth sample-and-hold stage.
For engineers reviewing the LTC2237IUH#PBF datasheet, LTC2237IUH#PBF pinout, LTC2237IUH#PBF application, or LTC2237IUH#PBF equivalent, this page provides verified technical context, package-validated pin functions, real-world application mappings, and two confirmed alternative parts with documented functional and application-level differences.
Technical Context
The LTC2237IUH#PBF implements a six-stage CMOS pipelined ADC architecture with internal correction logic and a dedicated clock duty cycle stabilizer that maintains performance across wide input clock duty cycles. Its sample-and-hold front-end supports both differential and single-ended drive, with aperture jitter of 0.2psRMS enabling high-fidelity sampling of RF and IF signals up to 140MHz.
It integrates a programmable reference system via SENSE and VCM pins, allowing selection between internal ±0.5V/±1V ranges or external reference scaling. Digital outputs are level-shifted via separate OVDD (0.5V–3.6V), supporting direct interfacing to FPGA or ASIC I/O banks without level-shifting circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit, no missing codes - guarantees monotonicity and full code coverage for precision measurement. |
| Sampling Rate | 40Msps - enables baseband digitization of signals up to 20MHz (Nyquist) with sufficient margin for anti-alias filtering. |
| SNR @ 5MHz | 61.8dBFS - delivers >6 effective number of bits (ENOB ≈ 10.0) for high-fidelity signal capture in spectral analysis. |
| SFDR @ 5MHz | 85dBc - suppresses spurious content critical for multi-tone communication receiver front-ends. |
| Input Bandwidth | 575MHz - supports direct sampling of IF signals up to 70MHz with <0.5dB flatness loss. |
| Power Dissipation | 120mW @ 40Msps - enables thermally constrained portable ultrasound and handheld instrumentation designs. |
| INL / DNL | ±0.1LSB typ / ±0.05LSB typ - ensures accurate amplitude linearity for medical imaging pixel calibration and radar pulse profiling. |
Pinout & Package
32-pin (5mm × 5mm) QFN package with exposed thermal pad (Pin 33 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN+, AIN– | Differential analog input pair | Accepts ±0.5V to ±1V differential signal; common-mode bias set by VCM (1.5V) or external source. |
| REFH, REFL | ADC reference voltage terminals | Shorted pairs; require local 0.1µF + 2.2µF ceramic bypass to GND for stable reference operation. |
| CLK | Single-ended sampling clock input | Positive-edge triggered; duty cycle stabilizer (enabled via MODE pin) relaxes clock source requirements. |
| SHDN, OE | Power management control inputs | Enable nap mode (15mW) or shutdown (2mW); OE controls output driver tri-state for bus sharing. |
| D0–D9 | Parallel digital output data bus | D9 = MSB; outputs swing from 0.5V to OVDD (configurable 0.5V–3.6V) for direct FPGA/ASIC interface. |
| OF | Over/underflow flag output | Active-high indicator of input signal exceeding selected full-scale range - used for AGC feedback loops. |
| MODE, SENSE | Configuration programming inputs | MODE selects output format (offset binary/2's complement) and duty cycle stabilizer; SENSE sets input range. |
| VCM | Internal 1.5V common-mode reference | Provides precise bias for differential drivers; must be bypassed with ≥2.2µF capacitor to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Flexible input range | Programmable ±0.5V to ±1V differential range via SENSE pin - eliminates external gain stages in multi-signal-path systems. |
| Clock duty cycle stabilizer | Enables full 40Msps performance with clock duty cycles from 40% to 60% - reduces need for precision clock buffers. |
| Low power operation | 120mW at 40Msps with 15mW nap mode - extends battery life in portable diagnostic equipment and field-deployable analyzers. |
| High dynamic range | 61.8dB SNR + 85dB SFDR at Nyquist - meets LTE/WiMAX adjacent channel rejection and ultrasound harmonic imaging requirements. |
| Separate output supply (OVDD) | Supports 0.5V–3.6V logic interface - allows direct connection to 1.8V/2.5V/3.3V FPGA I/O banks without level shifters. |
Applications
| Wireless Base Station Receiver | Medical Ultrasound Beamformer |
|---|---|
Use Scenario: Digitizing 70MHz IF signals from quadrature downconverters in LTE femtocell receivers. IC Role / Device Role / Timing Role: High-speed ADC capturing complex baseband I/Q data with minimal noise folding and spurious generation. Use Value: 85dB SFDR prevents intermodulation distortion from strong adjacent channels corrupting weak user signals. |
Use Scenario: Sampling echo return signals from phased-array transducers operating at 5–15MHz center frequencies. IC Role / Device Role / Timing Role: Precision digitizer in receive beamforming path, requiring low INL for spatial resolution and high SNR for tissue contrast. Use Value: ±0.1LSB INL ensures sub-millimeter depth accuracy; 61.8dB SNR preserves low-amplitude deep-tissue echoes. |
| Portable Spectrum Analyzer | Industrial Non-Destructive Testing (NDT) |
Use Scenario: Real-time FFT-based frequency analysis in handheld RF test equipment covering DC–100MHz. IC Role / Device Role / Timing Role: Core ADC in undersampling architecture, leveraging 575MHz input bandwidth for direct IF sampling. Use Value: 575MHz full-power bandwidth enables alias-free capture of 70MHz signals without image-reject filters. |
Use Scenario: Capturing ultrasonic pulse-echo waveforms from metal or composite material inspections. IC Role / Device Role / Timing Role: High-linearity ADC in time-of-flight measurement chain, where amplitude fidelity determines flaw sizing accuracy. Use Value: No missing codes and ±0.05LSB DNL prevent false defect indications caused by code transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD9226ASTZ-40 | 12-bit, 40Msps, 3.3V supply, 70dB SNR, 85dB SFDR, 650MHz input BW, no duty cycle stabilizer | Higher resolution but lower SNR; requires tighter clock duty cycle control; larger 48-lead LQFP package | Select when 12-bit resolution outweighs SNR penalty and board space permits larger footprint. |
| LTC2227IUH#PBF | 12-bit, 40Msps, identical pinout/package, 67.5dB SNR, 85dB SFDR, same 575MHz BW and power profile | Direct drop-in upgrade path within same family; higher ENOB for demanding imaging applications | Choose for improved amplitude fidelity in ultrasound or radar where 12-bit linearity justifies cost premium. |
Compared with AD9226ASTZ-40, LTC2237IUH#PBF offers superior SNR and integrated duty cycle stabilization in a smaller QFN; compared with LTC2227IUH#PBF, it trades 2 bits of resolution for lower cost and proven stability in legacy 10-bit signal chains.
Availability
LTC2237IUH#PBF is available at Aetrix Electronics and suitable for wireless infrastructure, medical imaging, and portable instrumentation requiring stable component supply across industrial temperature ranges (–40°C to +85°C).
Supply support for LTC2237IUH#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 semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2237IUH#PBF belongs to ADI's high-speed precision ADC product line, designed specifically for demanding digitization tasks in communications receivers, medical ultrasound, and test equipment where SNR, SFDR, and low power are critical.
FAQ
What is the operating temperature range for LTC2237IUH#PBF?
The LTC2237IUH#PBF is rated for industrial operation from –40°C to +85°C, as indicated by the "I" grade suffix in its part number. This range is validated per the Absolute Maximum Ratings table and applies to all key AC and DC specifications including SNR, SFDR, INL, and DNL, making it suitable for deployment in outdoor base stations and portable diagnostic devices.
Does LTC2237IUH#PBF support single-ended analog input?
Yes, LTC2237IUH#PBF supports single-ended input: connect AIN+ to the signal source and AIN– to VCM (1.5V). While SNR and DNL remain unchanged, harmonic distortion and INL degrade slightly versus differential drive - a trade-off acceptable in cost-sensitive portable instrumentation where layout simplicity outweighs ultimate linearity.
How does the MODE pin configure output format and clock stabilization on LTC2237IUH#PBF?
The MODE pin on LTC2237IUH#PBF selects both output coding and clock duty cycle stabilization: grounded = 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 simplifies system-level configuration without additional control lines.
What is the purpose of the OF (over/under flow) pin on LTC2237IUH#PBF?
The OF pin on LTC2237IUH#PBF is an active-high flag indicating that the analog input exceeded the selected full-scale range - either positive overflow or negative underflow. It is used in automatic gain control (AGC) loops to dynamically adjust front-end amplifier gain and prevent clipping-induced distortion in wide-dynamic-range receivers.
Can LTC2237IUH#PBF interface directly with a 1.8V FPGA I/O bank?
Yes, LTC2237IUH#PBF can interface directly with a 1.8V FPGA I/O bank by setting OVDD = 1.8V. Its digital outputs are specified to drive VOH ≥ 1.79V and VOL ≤ 0.09V at 1.6mA sink/source, meeting standard 1.8V LVCMOS voltage thresholds without external level shifters - reducing BOM count and signal integrity risk.
LTC2237IUH#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 10
- Sampling Rate (Per Second):
- 40M
- 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:
- 2.7V ~ 3.4V
- Voltage - Supply, Digital:
- 2.7V ~ 3.4V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 32-QFN (5x5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2237IUH#PBF FAQ
1.How can I place an order for LTC2237IUH#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2237IUH#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 LTC2237IUH#PBF reliable?
The price and inventory of LTC2237IUH#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2237IUH#PBF is usually 5 days.
3.What payment methods are accepted for LTC2237IUH#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2237IUH#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2237IUH#PBF?
LTC2237IUH#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2237IUH#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 LTC2237IUH#PBF?
For technical support, including LTC2237IUH#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2237IUH#PBF requirements.
6.How does Aetrix verify that LTC2237IUH#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2237IUH#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 LTC2237IUH#PBF meets industry standards.
7.What is the process for return or replacement of LTC2237IUH#PBF?
All LTC2237IUH#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2237IUH#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 LTC2237IUH#PBF part is unused and in its original packaging.
Return procedure for LTC2237IUH#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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