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Analog Devices Inc. LTC1745IFW#TRPBF
- Part No.:
- LTC1745IFW#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
LTC1745IFW#TRPBF.pdf
- Description:
- IC ADC 12BIT PIPELINED 48TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,886
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Product details
Overview
LTC1745IFW#TRPBF from Analog Devices (formerly Linear Technology) is a 25 Msps, 12-bit pipelined analog-to-digital converter optimized for high-frequency, wide dynamic range signal digitization in communications and instrumentation systems. It delivers 72.5 dB SNR and 91 dB SFDR at 3.2 V input range, operates on a single 5 V supply, features ±1 V or ±1.6 V pin-selectable differential input ranges, and supports ultralow 0.3 psRMS aperture jitter.
For engineers reviewing the LTC1745IFW#TRPBF datasheet, LTC1745IFW#TRPBF pinout, LTC1745IFW#TRPBF application, or LTC1745IFW#TRPBF equivalent, key selection considerations include its 48-lead TSSOP package with flow-through layout, resistor-programmable input range, dual-supply digital interface (OVDD = 0.5–5 V), and guaranteed no missing codes across temperature.
Technical Context
The LTC1745IFW#TRPBF implements a four-stage CMOS pipelined ADC architecture with integrated sample-and-hold, delivering 5-cycle data latency and full 240 MHz analog input bandwidth. Its differential ENC/ENC encode interface accepts PECL, GTL, TTL, or sinusoidal drive, enabling flexible clocking in undersampling applications.
Internal reference generation includes a 2.35 V bandgap source, programmable ±1 V / ±1.6 V input range via SENSE pin, and dedicated REFHA/REFHB and REFLA/REFLB pins with dual-pin outputs to minimize package inductance. DC accuracy is specified at ±0.4 LSB INL and ±0.2 LSB DNL over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Sampling Rate | 25 Msps - fixed-rate operation with 5-cycle pipeline latency; enables real-time baseband and IF sampling up to 70 MHz input. |
| Resolution & Linearity | 12-bit, no missing codes; ±0.4 LSB INL max - ensures monotonicity and accurate amplitude reconstruction in spectrum analysis. |
| Dynamic Performance | 72.5 dB SNR (3.2 V range, 5 MHz input); 91 dB SFDR (3.2 V range, 5 MHz input) - meets demanding spurious-free requirements in receivers and base stations. |
| Aperture Jitter | 0.3 psRMS - enables clean undersampling of RF signals up to 200 MHz without significant SNR degradation. |
| Analog Input Range | Selectable ±1 V or ±1.6 V differential - configured by grounding or tying SENSE pin to VDD; supports optimization for SNR (±1.6 V) or SFDR (±1 V). |
| Digital Interface | OVDD = 0.5–5 V; OE-controlled tri-state outputs; CLKOUT-synchronized latching - allows direct interfacing to low-voltage DSPs, FPGAs, or FIFOs without level-shifting. |
| Power Dissipation | 380 mW at 2 V range - enables thermal management in dense mixed-signal PCB layouts with minimal heatsinking. |
| Operating Temperature | –40°C to +85°C (I-grade) - qualified for industrial and outdoor telecom infrastructure environments. |
Pinout & Package
Package: 48-lead plastic TSSOP (FW), 7.6 mm × 12.5 mm, 0.5 mm pitch, flow-through pinout optimized for analog/digital signal separation and impedance-controlled routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN+, AIN– | Differential analog input pair | Accepts ±1 V or ±1.6 V differential signal; requires 2.35 V common-mode bias (VCM) and matched 50 Ω source impedance for optimal SFDR. |
| SENSE (Pin 1) | Input range configuration | GND = ±1 V range; VDD = ±1.6 V range; intermediate voltage sets proportional range - enables application-specific dynamic range tuning. |
| VCM (Pin 2) | Common-mode reference output | 2.35 V buffered output; must be bypassed with ≥4.7 µF ceramic capacitor - provides precise DC bias for transformer-coupled or op-amp-driven inputs. |
| ENC, ENC (Pins 23, 24) | Differential encode clock inputs | Edge-triggered sampling control; accepts PECL/GTL/sinusoidal drive - eliminates need for external clock conditioning in RF sampling systems. |
| OE (Pin 25) | Output enable | Active-low control of D0–D11 and OF outputs - enables time-multiplexed bus sharing and power-gated data capture. |
| CLKOUT (Pin 26) | Data valid strobe | Rising-edge synchronized with latched output data - simplifies timing closure with FPGA or ASIC capture logic without additional delay compensation. |
| D0–D11 (Pins 30–31, 33–35, 39–42, 44–46) | 12-bit parallel digital outputs | LSB = D0, MSB = D11; MSBINV (Pin 22) selects offset binary or 2's complement format - supports direct connection to TI C6000 or Xilinx Zynq PS/PL interfaces. |
| OVDD (Pins 32, 43) | Digital output supply | Independent 0.5–5 V rail - permits native interfacing to 1.8 V, 2.5 V, or 3.3 V logic without level translators or bus contention risks. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow aperture jitter (0.3 psRMS) | Enables high-fidelity undersampling of IF signals up to 200 MHz while maintaining >70 dB SNR - critical for zero-IF and direct-conversion receivers. |
| Pin-selectable ±1 V / ±1.6 V differential input | Allows trade-off between SFDR (optimized at ±1 V) and SNR (optimized at ±1.6 V) without changing BOM or layout - reduces design iterations in multi-band radios. |
| Flow-through 48-lead TSSOP pinout | Separates analog inputs (left side), power/ground (center), and digital outputs (right side) - minimizes crosstalk and simplifies controlled-impedance routing on 4-layer PCBs. |
| Resistor-programmable input range | Supports custom input spans (e.g., ±1.1 V, ±2.2 V) using external dividers on SENSE - extends usability beyond factory-set ranges for legacy sensor or DAC interface matching. |
| Single 5 V analog supply with 0.5–5 V digital supply | Eliminates need for auxiliary digital LDOs in mixed-voltage systems - reduces bill-of-materials count and improves power delivery efficiency in compact modules. |
| Guaranteed no missing codes over temperature | Ensures deterministic behavior in closed-loop control and real-time processing - avoids catastrophic errors in medical imaging or test equipment waveform reconstruction. |
Applications
| Telecom Base Station Receiver | Medical Ultrasound Imaging |
|---|---|
Use Scenario: Digitizing 70 MHz IF signals from quadrature downconverters in LTE/FDD base station transceivers. IC Role / Device Role / Timing Role: High-speed ADC front-end capturing I/Q data with <91 dB SFDR to suppress adjacent channel interference. Use Value: 240 MHz full-power bandwidth and 0.3 psRMS jitter preserve EVM performance below 2.5% at 20 MHz channel bandwidth. | Use Scenario: Sampling echo return signals from phased-array transducers operating at 5–15 MHz center frequencies. IC Role / Device Role / Timing Role: Time-domain digitizer acquiring 12-bit ultrasound waveforms with >72 dB SNR for beamforming and Doppler processing. Use Value: ±1.6 V input range maximizes dynamic range for weak echo detection while maintaining linearity across –40°C to +85°C ambient. |
| Spectrum Analyzer Front-End | High-Speed Data Acquisition System |
Use Scenario: Capturing wide instantaneous bandwidth (up to 125 MHz) in portable RF spectrum analyzers using harmonic mixing. IC Role / Device Role / Timing Role: Undersampling ADC converting 1–3 GHz RF bands directly to baseband with calibrated alias rejection. Use Value: Guaranteed no missing codes and ±0.4 LSB INL ensure accurate amplitude measurement across full frequency sweep without calibration drift. | Use Scenario: Recording transient electrical events (e.g., power grid faults, motor startup surges) at 25 Msps in industrial condition monitoring units. IC Role / Device Role / Timing Role: Precision digitizer capturing 12-bit voltage/current waveforms with timestamped trigger alignment via CLKOUT. Use Value: OE-controlled outputs and 5-cycle deterministic latency enable synchronized multi-channel acquisition across distributed sensor nodes. |
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-65 | 65 Msps, 12-bit, 3.3 V supply, LVDS outputs, no SENSE pin for range selection | Higher speed but requires external reference and level-shifting for 5 V systems; lacks ±1.6 V range option | Choose when system demands >25 Msps and can accommodate 3.3 V digital interface and external reference design. |
| LTC2245IUP#PBF | 65 Msps, 12-bit, 3 V supply, 0.5 psRMS jitter, QFN package | Superior jitter and speed but incompatible 3 V supply and non-pin-compatible footprint; no TSSOP variant available | Choose for next-generation designs prioritizing jitter-limited SNR above 100 MHz IF, accepting redesign effort for QFN layout and 3 V compliance. |
Compared with AD9226ASTZ-65 and LTC2245IUP#PBF, the LTC1745IFW#TRPBF offers unique value in 5 V single-supply operation, ±1.6 V input range flexibility, and TSSOP packaging - making it optimal for cost-sensitive, thermally constrained, or legacy 5 V-based instrumentation where moderate speed suffices.
Availability
LTC1745IFW#TRPBF is available at Aetrix Electronics and suitable for telecom infrastructure, medical imaging equipment, spectrum analysis instruments, and industrial data acquisition systems requiring stable component supply and long-term manufacturability.
Supply support for LTC1745IFW#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 precision instrumentation, communications, and industrial markets since 1965.
The LTC1745IFW#TRPBF belongs to ADI's legacy Linear Technology high-speed ADC product line, designed specifically for wideband, low-jitter digitization in demanding RF and real-time signal processing applications where SNR, SFDR, and deterministic latency are critical.
FAQ
What is the maximum analog input frequency supported by the LTC1745IFW#TRPBF?
The LTC1745IFW#TRPBF has a 240 MHz full-power analog input bandwidth, meaning it maintains specified SNR and SFDR performance for input signals up to 240 MHz. However, due to Nyquist constraints at 25 Msps sampling, usable input frequencies extend up to ~12.5 MHz for baseband sampling or higher via undersampling - validated up to 70 MHz with 71.5 dB SNR in typical performance curves.
Does the LTC1745IFW#TRPBF require an external reference, or is it internally generated?
The LTC1745IFW#TRPBF integrates a 2.35 V bandgap reference and internal difference amplifier, eliminating the need for an external reference in standard configurations. The SENSE pin selects between ±1 V and ±1.6 V input ranges using internal resistive division; external references may be applied to SENSE only for custom ranges, not as primary reference sources.
Can the LTC1745IFW#TRPBF operate with a 3.3 V digital supply (OVDD)?
Yes, the LTC1745IFW#TRPBF supports OVDD from 0.5 V to 5 V, including 3.3 V. Digital outputs (D0–D11, OF, CLKOUT) are fully compatible with 3.3 V logic families when OVDD = 3.3 V, and VOH/VOL specifications guarantee interoperability with standard 3.3 V CMOS inputs without level shifters.
How does the MSBINV pin affect data formatting on the LTC1745IFW#TRPBF?
The MSBINV pin on the LTC1745IFW#TRPBF controls output coding format: logic low selects 2's complement (for bipolar signal processing), while logic high selects offset binary (standard for unsigned data paths). This allows seamless integration with both DSPs expecting signed arithmetic and FPGAs using unsigned capture logic.
Is the LTC1745IFW#TRPBF pin-compatible with other members of the LTC174x family?
Yes, the LTC1745IFW#TRPBF shares identical 48-lead TSSOP (FW) packaging and pinout with the LTC1746 (14-bit, 25 Msps), LTC1744 (14-bit, 50 Msps), and LTC1743 (12-bit, 50 Msps), enabling drop-in resolution or speed upgrades on existing PCBs - provided OVDD, reference, and timing constraints are verified per device datasheet.
LTC1745IFW#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:
- 12
- Sampling Rate (Per Second):
- 25M
- 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:
- -
LTC1745IFW#TRPBF FAQ
1.How can I place an order for LTC1745IFW#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1745IFW#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 LTC1745IFW#TRPBF reliable?
The price and inventory of LTC1745IFW#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1745IFW#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1745IFW#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1745IFW#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1745IFW#TRPBF?
LTC1745IFW#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1745IFW#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 LTC1745IFW#TRPBF?
For technical support, including LTC1745IFW#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1745IFW#TRPBF requirements.
6.How does Aetrix verify that LTC1745IFW#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1745IFW#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 LTC1745IFW#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1745IFW#TRPBF?
All LTC1745IFW#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1745IFW#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 LTC1745IFW#TRPBF part is unused and in its original packaging.
Return procedure for LTC1745IFW#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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