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Analog Devices Inc. LTC1750CFW#TRPBF
- Part No.:
- LTC1750CFW#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
LTC1750CFW#TRPBF.pdf
- Description:
- IC ADC 14BIT PIPELINED 48TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,931
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Product details
Overview
LTC1750CFW#TRPBF from Analog Devices (formerly Linear Technology) is a 14-bit, 80Msps pipelined analog-to-digital converter optimized for direct IF sampling up to 500MHz. It integrates a programmable-gain amplifier (PGA), 500MHz full-power bandwidth sample-and-hold, 75.5dB SNR (PGA=0), 90dB SFDR, and operates from a single 5V supply with 1.45W power dissipation. It is used in cellular base station receivers and spectrum analyzers requiring high dynamic range digitization of wideband RF signals.
For engineers reviewing the LTC1750CFW#TRPBF datasheet, LTC1750CFW#TRPBF pinout, LTC1750CFW#TRPBF application, or LTC1750CFW#TRPBF equivalent, key selection criteria include its 80Msps sampling rate, ±1.125V differential input range, 0.12psRMS aperture jitter, flow-through 48-pin TSSOP package, and dual reference configuration supporting both internal and external VREF selection.
Technical Context
The LTC1750CFW#TRPBF employs a four-stage CMOS pipelined ADC architecture with integrated PGA front-end and low-jitter sample-and-hold. Its differential analog inputs require 2.0V common-mode bias (provided by VCM pin), and it supports both two's complement and offset binary output formats via MSBINV control.
Encode timing uses differential ENC/ENC inputs compatible with PECL, GTL, TTL, or sinusoidal drive; digital outputs are powered by a separate OVDD rail (0.5V–5V), enabling direct interfacing with low-voltage DSPs or FIFOs without level-shifting. Data latency is fixed at five clock cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit with guaranteed no missing codes - ensures monotonicity and deterministic code transitions across full operating range. |
| Sample Rate | 80Msps - supports Nyquist-limited signal capture up to 40MHz or undersampling of IF signals up to 500MHz. |
| SNR / SFDR | 75.5dB SNR and 90dB SFDR at 5MHz input (PGA = 0) - enables high-fidelity digitization of narrowband signals with minimal noise floor elevation. |
| Input Bandwidth | 500MHz full-power bandwidth - allows direct sampling of L-band and S-band IF signals without external anti-alias filtering. |
| Aperture Jitter | 0.12psRMS - limits SNR degradation to ≤0.5dB at 250MHz input, critical for undersampling accuracy. |
| Power Supply | Single 5V analog supply (VDD), independent 0.5V–5V digital output supply (OVDD) - decouples analog integrity from digital switching noise. |
| Operating Temp | 0°C to +70°C (Commercial grade) - validated for use in base station remote radio units and lab-grade test equipment. |
Pinout & Package
Package: 48-pin plastic TSSOP (FW package), flow-through pinout optimized for controlled-impedance PCB layout and minimal crosstalk between analog and digital sections.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN+, AIN– | Differential analog input pair | Accepts ±1.125V (PGA=0) or ±0.675V (PGA=1) differential signal; requires 2.0V common-mode bias via VCM pin. |
| ENC, ENC | Differential encode clock inputs | Edge-triggered sampling; accepts PECL, GTL, TTL, or sine wave; determines acquisition timing and aperture delay stability. |
| CLKOUT | Data valid strobe output | Rising edge indicates stable parallel digital output (D0–D13); synchronized to internal pipeline latency (5 cycles). |
| OF | Over/underflow flag | Active-high pulse indicates input exceeded ±VREF/PGA gain range - enables real-time clipping detection in receiver AGC loops. |
| MSBINV | Output format control | Low = two's complement; High = offset binary - selects data representation for downstream DSP/FPGA interface compatibility. |
| PGA | Front-end gain select | Low = gain 1 (±1.125V input range); High = gain 1.67 (±0.675V range) - optimizes dynamic range for varying signal amplitudes. |
| SENSE | Reference sense input | GND = 0.7V reference; VDD = 1.125V reference; intermediate voltage sets proportional VREF - configures full-scale input range. |
| VCM | Common-mode bias output | 2.0V ±30ppm/°C output - provides precise DC bias for transformer-coupled or op-amp-driven differential input stages. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Gain Amplifier (PGA) | Two selectable front-end gains (1× or 1.67×) enable optimal SNR vs. input amplitude trade-off without external amplification. |
| Dual Reference Configuration | Pin-selectable internal reference (0.7V or 1.125V) or external reference support - simplifies system-level scaling and calibration flexibility. |
| Independent Digital Output Supply (OVDD) | 0.5V–5V OVDD rail allows direct connection to 1.8V, 2.5V, or 3.3V logic families - eliminates need for external level shifters or translators. |
| Out-of-Range Indicator (OF) | Dedicated OF pin provides immediate overrange detection - enables fast AGC response or data validity flagging in real-time signal processing. |
| Flow-Through Pinout | Signal routing separates analog inputs (left side), encode clocks (center), and digital outputs (right side) - reduces layout-induced coupling and EMI. |
Applications
| Cellular Base Station Receiver | Spectrum Analyzer Front-End |
|---|---|
Use Scenario: Digitizing 70–250MHz IF signals from heterodyne downconverters in LTE/5G macrocell radios. IC Role / Device Role / Timing Role: Primary ADC capturing wide instantaneous bandwidth with minimal distortion for digital predistortion and channel estimation. Use Value: 500MHz S/H bandwidth and 90dB SFDR preserve adjacent-channel interference rejection and ACLR compliance. |
Use Scenario: High-resolution frequency-domain analysis of RF emissions from 10MHz to 500MHz in benchtop and portable analyzers. IC Role / Device Role / Timing Role: Core digitizer enabling real-time FFT processing with >75dB effective number of bits (ENOB) at 30MHz. Use Value: 0.12psRMS jitter and 75.5dB SNR ensure accurate spectral purity measurement and spurious-free resolution. |
| MRI Signal Acquisition | Tomography Imaging System |
Use Scenario: Capturing low-noise, high-fidelity RF echo signals from MRI gradient coils during spin-echo sequences. IC Role / Device Role / Timing Role: High-linearity ADC converting resonant RF returns into time-domain k-space data for image reconstruction. Use Value: ±0.75LSB INL and no missing codes guarantee quantitative accuracy in medical image intensity mapping. |
Use Scenario: Digitizing ultrasonic or X-ray detector outputs in CT/PET systems requiring wide dynamic range and low harmonic distortion. IC Role / Device Role / Timing Role: Precision ADC handling multi-decade signal amplitudes from weak scatter to strong primary beam pulses. Use Value: PGA front-end and dual reference support adapt full-scale range to varying detector gain profiles without hardware change. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD9246BCPZ-80 | 14-bit, 80Msps, but uses 3.3V supply and LVDS outputs; lacks integrated PGA and VCM buffer. | Requires external driver and reference circuitry; better suited for systems with existing LVDS infrastructure and lower power budgets. | Select AD9246BCPZ-80 when board space permits external signal conditioning and LVDS serialization is preferred over parallel CMOS outputs. |
| ADS5500IPAP | 14-bit, 65Msps, 3.3V supply, integrated PLL clock multiplier; no PGA or VCM output. | Lower sample rate limits IF bandwidth; PLL simplifies clock generation but adds phase noise not present in LTC1750CFW#TRPBF's clean ENC-driven timing. | Select ADS5500IPAP only if system clocking constraints favor on-chip multiplication and 65Msps suffices for target IF bandwidth. |
Compared with AD9246BCPZ-80 and ADS5500IPAP, the LTC1750CFW#TRPBF uniquely combines PGA front-end, VCM bias generation, and 500MHz analog bandwidth in a single 5V CMOS interface - reducing BOM count and layout complexity for wideband receiver designs.
Availability
LTC1750CFW#TRPBF is available at Aetrix Electronics and suitable for cellular infrastructure, test instrumentation, and medical imaging systems requiring stable component supply, long-term obsolescence management, and traceable sourcing.
Supply support for LTC1750CFW#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC1750CFW#TRPBF belongs to Linear's high-speed precision ADC product line, designed specifically for demanding communications and instrumentation applications where wide bandwidth, low distortion, and flexible interface options are essential.
FAQ
What is the maximum input frequency supported by the LTC1750CFW#TRPBF for direct sampling?
The LTC1750CFW#TRPBF supports direct IF sampling up to 500MHz, as specified by its 500MHz full-power bandwidth sample-and-hold circuit. This enables undersampling of L-band and S-band signals without external bandpass filtering, provided the input signal remains within the ±1.125V differential range and common-mode voltage is maintained at 2.0V via the VCM pin.
Does the LTC1750CFW#TRPBF require external reference components?
The LTC1750CFW#TRPBF includes an internal 2.0V bandgap reference accessible at the VCM pin and supports pin-selectable internal references (0.7V or 1.125V) via the SENSE pin. External reference bypassing is required - REFHA/REFHB and REFLA/REFLB pins must be decoupled with 4.7µF and 0.1µF ceramic capacitors per datasheet layout guidelines - but no external reference IC is mandatory.
How does the PGA setting affect the input range and dynamic performance of the LTC1750CFW#TRPBF?
When PGA = Low, the LTC1750CFW#TRPBF provides ±1.125V differential input range and achieves 75.5dB SNR at 5MHz. When PGA = High, input range reduces to ±0.675V and SNR drops to 73.0dB - trading headroom for improved small-signal resolution. SFDR remains 90dB in both modes, preserving spurious-free performance across gain settings.
Can the LTC1750CFW#TRPBF interface directly with a 1.8V FPGA I/O bank?
Yes. The LTC1750CFW#TRPBF's OVDD supply accepts 0.5V–5V, allowing direct connection of D0–D13, CLKOUT, and OF outputs to 1.8V FPGA I/O banks when OVDD = 1.8V. Digital input thresholds (MSBINV, PGA, ENC/ENC) remain compatible with 1.8V logic levels due to their specified VIH/VIL ranges at VDD = 5V.
What is the purpose of the OF (Over/Under Flow) pin on the LTC1750CFW#TRPBF?
The OF pin on the LTC1750CFW#TRPBF asserts high whenever the analog input exceeds the configured full-scale range (±VREF/PGA gain), indicating clipping or saturation. This real-time flag enables immediate AGC adjustment, data discard, or alarm triggering in receiver and test equipment applications - improving system robustness without post-processing analysis.
LTC1750CFW#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 48-TFSOP (0.240", 6.10mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 14
- Sampling Rate (Per Second):
- 80M
- Number of Inputs:
- 1
- Input Type:
- Differential
- 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:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 48-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1750CFW#TRPBF FAQ
1.How can I place an order for LTC1750CFW#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1750CFW#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 LTC1750CFW#TRPBF reliable?
The price and inventory of LTC1750CFW#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1750CFW#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1750CFW#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1750CFW#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1750CFW#TRPBF?
LTC1750CFW#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1750CFW#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 LTC1750CFW#TRPBF?
For technical support, including LTC1750CFW#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1750CFW#TRPBF requirements.
6.How does Aetrix verify that LTC1750CFW#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1750CFW#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 LTC1750CFW#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1750CFW#TRPBF?
All LTC1750CFW#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1750CFW#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 LTC1750CFW#TRPBF part is unused and in its original packaging.
Return procedure for LTC1750CFW#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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