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Analog Devices Inc. LTC1748IFW#PBF
- Part No.:
- LTC1748IFW#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
LTC1748IFW#PBF.pdf
- Description:
- IC ADC 14BIT PIPELINED 48TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,597
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Product details
Overview
LTC1748IFW#PBF from Analog Devices (formerly Linear Technology) is a 14-bit, 80Msps pipelined analog-to-digital converter optimized for high-frequency, wide-dynamic-range signal digitization in communications infrastructure. It delivers 76.3dB SNR and 90dB SFDR at 3.2V input range, features 240MHz full-power bandwidth sample-and-hold, ±3LSB INL, and operates from a single 5V supply with 1.4W power dissipation. It serves as the front-end digitizer in cellular base station receivers and spectrum analyzers.
For engineers reviewing the LTC1748IFW#PBF datasheet, LTC1748IFW#PBF pinout, LTC1748IFW#PBF application, or LTC1748IFW#PBF equivalent, key selection criteria include differential input range selectability (±1V/±1.6V), ultralow 0.15psRMS aperture jitter, flow-through TSSOP-48 pinout for layout simplification, and compatibility with 5V/3V/2V/LVDS digital interfaces.
Technical Context
The LTC1748IFW#PBF implements a four-stage CMOS pipelined ADC architecture with integrated correction logic and digital output latches. Its sample-and-hold uses direct capacitor sampling with 4pF input capacitance in hold mode and supports differential ENC/ENC clocking with 12.5ns minimum period.
It features resistor-programmable input range via SENSE pin, 2.35V VCM common-mode bias output with ±30ppm/°C tempco, and separate OVDD supply (0.5V–5V) enabling direct interfacing to low-voltage DSPs or FIFOs without level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit with guaranteed no missing codes - ensures monotonicity and deterministic code mapping across full temperature range. |
| Sample Rate | 80Msps - supports Nyquist-limited bandwidth up to 40MHz; enables undersampling of IF signals up to 250MHz with usable SNR. |
| SNR / SFDR | 76.3dB / 90dB at 5MHz, 3.2V range - defines dynamic range for high-fidelity digitization of weak signals amid strong interferers. |
| Aperture Jitter | 0.15psRMS - limits sampling-time uncertainty, critical for maintaining SNR when undersampling RF/IF carriers above 100MHz. |
| INL / DNL | ±3LSB / ±1.5LSB max - constrains integral nonlinearity error to <0.05% of full scale, preserving spectral purity in FFT-based analysis. |
| Input Bandwidth | 240MHz full-power - allows digitization of wideband modulated signals (e.g., WCDMA, LTE) without amplitude roll-off. |
| Power Dissipation | 1.4W at 80Msps - requires thermal design with θJA = 35°C/W; junction temperature must stay ≤150°C in –40°C to +85°C operating range. |
Pinout & Package
The LTC1748IFW#PBF is housed in a 48-lead plastic TSSOP (FW package) with flow-through pinout optimized for controlled-impedance PCB routing and minimal crosstalk between analog and digital sections.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN+, AIN– | Differential analog input pair | Accepts ±1V or ±1.6V differential signal; requires 2.35V common-mode bias (VCM) for optimal linearity and noise performance. |
| SENSE | Input range selection | Ground = ±1V range; VDD = ±1.6V range; intermediate voltage sets proportional range - enables optimization for signal swing and SNR. |
| VCM | Common-mode reference output | 2.35V buffered output with ±30ppm/°C tempco; must be bypassed with ≥4.7µF ceramic capacitor to support stable differential input drive. |
| ENC, ENC | Differential encode clock inputs | Edge-triggered sampling control; accepts PECL, GTL, TTL, CMOS, or sinusoidal drive - eliminates need for external clock conditioning circuitry. |
| D0–D13, OF | Parallel digital outputs | 14-bit data + overflow flag; output voltage swing referenced to OVDD (0.5V–5V), enabling direct connection to 1.8V/2.5V/3.3V/5V logic families. |
| CLKOUT | Data valid strobe | Rising edge indicates stable data on D0–D13; provides synchronous latch timing for external FIFOs or DSPs without additional clock distribution. |
Key Features
| Feature | Design Value |
|---|---|
| Pipelined 14-bit architecture with digital correction | Delivers 5-cycle latency and guarantees no missing codes across –40°C to +85°C, eliminating post-processing calibration in production systems. |
| Selectably programmable input range (±1V/±1.6V) | Allows matching of ADC full-scale to signal chain gain without external attenuators or amplifiers - reduces component count and noise figure degradation. |
| Ultralow 0.15psRMS aperture jitter | Enables high-fidelity undersampling of 140MHz+ IF signals while maintaining >71dB SNR - critical for zero-IF and direct-conversion receiver architectures. |
| Separate OVDD supply (0.5V–5V) | Permits direct interface to low-voltage processors (e.g., 1.8V DSPs) without level translators, reducing BOM cost and signal integrity risk. |
| Flow-through TSSOP-48 pinout | Groups analog inputs (Pins 4–5), references (Pins 10–11, 14–15), and digital outputs (Pins 28–46) into distinct physical zones - simplifies partitioning and minimizes coupling in mixed-signal layouts. |
Applications
| Cellular Base Station Receiver | Spectrum Analyzer Front-End |
|---|---|
Use Scenario: Digitizing 70MHz–250MHz IF signals from multi-carrier RF downconverters in macrocell BTS equipment. IC Role / Device Role / Timing Role: Primary ADC in wideband receiver chain; samples at 80Msps to capture 40MHz instantaneous bandwidth with 76.3dB SNR. Use Value: 240MHz S/H bandwidth and 90dB SFDR suppress adjacent-channel interference, enabling simultaneous demodulation of multiple LTE carriers within a single ADC. | Use Scenario: Capturing transient RF emissions across 10kHz–1GHz span using swept-tuned or real-time FFT-based architectures. IC Role / Device Role / Timing Role: High-speed digitizer feeding real-time FFT engine; leverages 0.15psRMS jitter to maintain frequency resolution during undersampling. Use Value: ±3LSB INL and no missing codes ensure accurate amplitude measurement across full dynamic range - essential for compliance testing and EMI diagnostics. |
| Imaging System Data Acquisition | Communications Test Equipment |
Use Scenario: Converting analog video or radar return signals in medical ultrasound or synthetic aperture radar (SAR) systems. IC Role / Device Role / Timing Role: High-fidelity digitizer for time-domain waveform capture; uses differential input and VCM bias to reject common-mode noise from high-gain analog front-ends. Use Value: 72.6dB SNR at 2V range preserves low-amplitude echo detail; 14-bit resolution enables >80dB dynamic range for tissue differentiation or target discrimination. | Use Scenario: Signal generation and analysis in vector signal analyzers (VSAs) and arbitrary waveform generators (AWGs) requiring calibrated ADC performance. IC Role / Device Role / Timing Role: Metrology-grade ADC in calibration reference path; operated with external precision reference and matched source impedance. Use Value: Gain error ±1%FS and offset error ±8mV enable traceable DC accuracy; 94dB SFDR (other spurs) ensures clean spectral measurements below –90dBc. |
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; 74.5dB SNR, 88dB SFDR; LVDS outputs only; requires dual supply (1.8V core + 3.3V I/O). | Better suited for space-constrained LVDS-based FPGA interfaces; lower power (750mW) but reduced SFDR margin at high input frequencies. | Select when system uses LVDS SerDes and thermal budget is tight; verify SFDR meets spurious mask requirements at target IF frequency. |
| LTC2264IUP-14 | 14-bit, 80Msps; 73.5dB SNR, 89dB SFDR; SPI-configurable; internal dither; 64-pin QFN package. | Offers programmable features (gain, offset, test modes) via SPI; better layout flexibility with exposed pad thermal path; no flow-through pinout. | Choose when firmware configurability or enhanced thermal performance is prioritized over fixed-function simplicity and TSSOP layout familiarity. |
Compared with AD9246BCPZ-80 and LTC2264IUP-14, the LTC1748IFW#PBF provides superior SFDR consistency across 2nd/3rd harmonics and broader digital interface voltage support (0.5V–5V), making it preferred for legacy 5V logic integration and demanding spectral purity requirements in base station and test equipment.
Availability
LTC1748IFW#PBF is available at Aetrix Electronics and suitable for cellular infrastructure, spectrum analysis, imaging systems, and communications test equipment requiring stable component supply across extended industrial temperature ranges.
Supply support for LTC1748IFW#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 semiconductors.
The LTC1748IFW#PBF belongs to Linear's high-speed precision ADC product line, engineered specifically for communications infrastructure where dynamic range, jitter immunity, and interface flexibility determine system-level RF performance.
FAQ
What is the operating temperature range for the LTC1748IFW#PBF?
The LTC1748IFW#PBF is rated for operation from –40°C to +85°C (Industrial grade). This is confirmed by the "I" suffix in the part number and specified in the Absolute Maximum Ratings table. Junction temperature must not exceed 150°C, and thermal design must account for θJA = 35°C/W under worst-case power dissipation of 1.55W.
Does the LTC1748IFW#PBF support both offset binary and two's complement output formats?
Yes, the LTC1748IFW#PBF supports both output formats via the MSBINV pin (Pin 22). When MSBINV is high, the device outputs offset binary data; when low, it outputs two's complement format. This selection is static and does not require reconfiguration during conversion cycles.
Can the LTC1748IFW#PBF be used with a single-ended input signal?
No, the LTC1748IFW#PBF requires differential analog input drive for specified AC performance. Its functional block diagram, input structure, and all dynamic specifications (SNR, SFDR, THD) assume differential signaling with 2.35V common-mode bias. Single-ended drive degrades even-order harmonic rejection and invalidates datasheet performance claims.
What is the purpose of the SENSE pin on the LTC1748IFW#PBF?
On the LTC1748IFW#PBF, the SENSE pin (Pin 1) selects the full-scale differential input range: grounded for ±1V, tied to VDD for ±1.6V, or biased to an intermediate voltage for proportional scaling (e.g., ±1.2V). This resistor-programmable feature allows optimization of input signal swing without external gain stages.
Is the LTC1748IFW#PBF pin-compatible with other members of the LTC174x family?
Yes, the LTC1748IFW#PBF is pin-compatible with the entire LTC174x family including LTC1747, LTC1746, LTC1744, LTC1742, and LTC1741 - all use the same 48-pin TSSOP (FW) package and share identical pin functions and layout footprint, enabling drop-in rate upgrades in existing designs.
LTC1748IFW#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 48-TFSOP (0.240", 6.10mm Width)
- Packaging:
- Tube
- 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:
- -40°C ~ 85°C
- Supplier Device Package:
- 48-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1748IFW#PBF FAQ
1.How can I place an order for LTC1748IFW#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1748IFW#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 LTC1748IFW#PBF reliable?
The price and inventory of LTC1748IFW#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1748IFW#PBF is usually 5 days.
3.What payment methods are accepted for LTC1748IFW#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1748IFW#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1748IFW#PBF?
LTC1748IFW#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1748IFW#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 LTC1748IFW#PBF?
For technical support, including LTC1748IFW#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1748IFW#PBF requirements.
6.How does Aetrix verify that LTC1748IFW#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1748IFW#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 LTC1748IFW#PBF meets industry standards.
7.What is the process for return or replacement of LTC1748IFW#PBF?
All LTC1748IFW#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1748IFW#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 LTC1748IFW#PBF part is unused and in its original packaging.
Return procedure for LTC1748IFW#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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