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Analog Devices Inc. LTC1743IFW#PBF
- Part No.:
- LTC1743IFW#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-TFSOP (0.240", 6.10mm Width)
- Datasheet:
-
LTC1743IFW#PBF.pdf
- Description:
- IC ADC 12BIT PIPELINED 48TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,224
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Product details
Overview
LTC1743IFW#PBF from Analog Devices (formerly Linear Technology) is a 12-bit, 50 Msps pipelined analog-to-digital converter optimized for high-frequency, wide-dynamic-range signal digitization in communications infrastructure. It delivers 72.5 dB SNR and 85 dB SFDR at ±1.6 V differential input range, operates from a single 5 V supply, dissipates 1000 mW, and features 150 MHz full-power bandwidth sample-and-hold. It is deployed in cellular base station receivers and spectrum analyzers requiring undersampling of IF signals.
For engineers reviewing the LTC1743IFW#PBF datasheet, LTC1743IFW#PBF pinout, LTC1743IFW#PBF application, or LTC1743IFW#PBF equivalent, key selection criteria include its 50 Msps sampling rate with ±1 V / ±1.6 V selectable input ranges, ultralow 0.3 psRMS aperture jitter, ±1 LSB INL over temperature, flow-through 48-pin TSSOP layout, and compatibility with 0.5–5 V digital output supplies for direct interfacing to low-voltage DSPs.
Technical Context
The LTC1743IFW#PBF employs a 4-stage CMOS pipelined architecture with internal residue amplification and digital correction logic, delivering digitized output five clock cycles after encode initiation. Its differential analog input (AIN+, AIN−) and differential encode interface (ENC, ENC) provide high common-mode noise immunity and suppress even-order harmonics.
It integrates a 2.5 V bandgap reference with programmable gain difference amplifier, enabling pin-selectable ±1 V (SENSE = GND) or ±1.6 V (SENSE = VDD) input ranges. The VCM pin provides a buffered 2.5 V common-mode bias with ±30 ppm/°C tempco, and the S/H acquisition time is guaranteed at 7.5–9.5 ns with 150 MHz bandwidth into 50 Ω source.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes - guarantees monotonicity and deterministic code mapping across full operating range. |
| Sampling Rate | 50 Msps maximum - supports Nyquist-limited IF sampling up to 25 MHz or undersampling of higher RF bands. |
| SNR (2V Range) | 71 dBFS at 5 MHz - enables high-fidelity digitization of narrowband communication signals with >11 effective bits. |
| SFDR (2V Range) | 90 dBc at 5 MHz - ensures clean spectral representation with minimal spurious content in dense signal environments. |
| Aperture Jitter | 0.3 psRMS - limits sampling-time uncertainty, critical for maintaining SNR when undersampling >100 MHz IF signals. |
| INL / DNL | ±1 LSB / ±0.8 LSB max - preserves amplitude accuracy and integral linearity for measurement and calibration-critical applications. |
| Input Bandwidth | 150 MHz full-power - allows direct digitization of wideband signals without external anti-alias filtering below 150 MHz. |
Pinout & Package
Package: 48-lead plastic TSSOP (FW), 7.0 mm × 12.5 mm, 0.5 mm pitch, flow-through pinout optimized for controlled-impedance analog and digital routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN+, AIN− | Differential analog input pair | Accepts ±1 V or ±1.6 V differential signal; requires matched 100 Ω source impedance for optimal SFDR. |
| SENSE (Pin 1) | Input range configuration | GND selects ±1 V range; VDD selects ±1.6 V range; intermediate voltage sets proportional range (e.g., ±VSENSE). |
| VCM (Pin 2) | Common-mode bias output | Provides stable 2.5 V ±30 ppm/°C reference for external driver circuits; must be bypassed with ≥4.7 µF ceramic capacitor. |
| ENC, ENC (Pins 23–24) | Differential encode clock inputs | Conversion triggered on ENC rising edge; accepts PECL, GTL, TTL, CMOS, or sinusoidal drive without performance degradation. |
| CLKOUT (Pin 26) | Data valid strobe | Rising edge indicates valid D11–D0 and OF outputs; synchronized to internal pipeline latency (t5 = 0.5–2.3 ns). |
| OE (Pin 25) | Output enable control | Active-low enables 12-bit parallel LVCMOS/LVTTL outputs; high-Z state isolates bus during data hold or multiplexing. |
| OVDD (Pins 32, 43) | Digital output supply | Independent 0.5–5 V supply allows direct interfacing to 1.8 V, 2.5 V, or 3.3 V logic without level shifters. |
| OF (Pin 48) | Over/underflow flag | Asserted high when input exceeds ±FS range; used for real-time clipping detection and AGC feedback loops. |
Key Features
| Feature | Design Value |
|---|---|
| Pipelined 4-stage ADC architecture | Enables 50 Msps throughput with deterministic 5-cycle latency and built-in digital error correction. |
| Differential ENC/ENC interface | Rejects common-mode noise on clock path, eliminating need for external clock conditioning in noisy RF environments. |
| Resistor-programmable input range | Supports ±1 V to ±1.6 V via SENSE pin voltage, allowing optimization for signal swing without redesigning front-end gain stages. |
| Separate OVDD supply (0.5–5 V) | Eliminates level-shifter ICs when interfacing to low-voltage FPGAs or DSPs, reducing BOM count and board area. |
| Flow-through 48-pin TSSOP layout | Groups analog inputs (Pins 4–5), references (Pins 10–11, 14–15), and digital outputs (Pins 30–46) on opposite sides to minimize crosstalk and simplify PCB stackup. |
Applications
| Cellular Base Station Receivers | Spectrum Analyzers |
|---|---|
Use Scenario: Digitizing 70–200 MHz IF signals from RF downconverters in multi-carrier WCDMA/LTE base stations. IC Role / Device Role / Timing Role: High-speed ADC capturing wide instantaneous bandwidth for digital channelization and MIMO processing. Use Value: 72.5 dB SNR and 85 dB SFDR preserve EVM and ACLR performance; 0.3 psRMS jitter enables accurate undersampling of 140 MHz IF with <0.1 dB SNR loss. | Use Scenario: Real-time frequency-domain analysis of broadband RF emissions in EMC testing and signal intelligence systems. IC Role / Device Role / Timing Role: Front-end digitizer providing ≥50 Msps capture for 8192-point FFTs with <100 kHz resolution bandwidth. Use Value: 150 MHz input bandwidth captures full span without external pre-filtering; ±1 LSB INL ensures amplitude fidelity for calibrated power measurements. |
| Imaging Systems | Communications Test Equipment |
Use Scenario: Digitizing ultrasound echo return signals or radar baseband I/Q channels in portable medical and defense platforms. IC Role / Device Role / Timing Role: Low-latency ADC converting time-domain analog waveforms into high-fidelity digital samples for beamforming or pulse compression. Use Value: No missing codes and ±0.8 LSB DNL prevent image artifacts; 1000 mW dissipation is thermally manageable in compact sealed enclosures. | Use Scenario: Signal generation and analysis in vector signal analyzers (VSAs) and arbitrary waveform generators (AWGs) requiring precise stimulus/response correlation. IC Role / Device Role / Timing Role: Reference-grade digitizer validating DAC linearity and measuring phase noise in closed-loop test setups. Use Value: 71 dB SNR at 2 V range and 90 dB SFDR at 5 MHz support ENOB >11.5 bits for metrology-grade measurements traceable to NIST standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1744IFW#PBF | 14-bit, 50 Msps, same 48-pin TSSOP package and pinout; 74.5 dB SNR (2V), 87 dB SFDR (2V); higher power (1300 mW). | Better dynamic range for demanding IF sampling where 2 extra bits improve ENOB in low-SNR environments. | Select when system SNR budget requires >12-bit effective resolution and board thermal design accommodates +300 mW. |
| AD9226ASTZ-50 | 12-bit, 65 Msps, 48-lead LQFP; 70 dB SNR (2V), 85 dB SFDR (2V); single-supply 3.3 V operation; no SENSE/VCM pins. | Higher sample rate but lower SNR; simplified biasing (no VCM/Sense), less flexible input range control. | Select when 65 Msps is mandatory and ±1.6 V range adaptability is not required; verify layout compatibility with LQFP vs TSSOP. |
Compared with LTC1744IFW#PBF, the LTC1743IFW#PBF trades 2 bits of resolution for lower power and identical pin compatibility, while AD9226ASTZ-50 offers higher speed in a different package with reduced analog flexibility-making LTC1743IFW#PBF optimal for cost- and thermal-constrained 50 Msps IF receiver designs requiring field-programmable input scaling.
Availability
LTC1743IFW#PBF is available at Aetrix Electronics and suitable for cellular infrastructure, spectrum monitoring, medical imaging, and test equipment requiring stable component supply with guaranteed long-term availability and consistent parametric performance across production lots.
Supply support for LTC1743IFW#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 precision instrumentation, communications, and industrial markets.
The LTC1743IFW#PBF belongs to ADI's legacy Linear Technology high-speed ADC product line, engineered specifically for wireless infrastructure and instrumentation applications demanding ultra-low jitter, wide input bandwidth, and flexible analog interface options.
FAQ
What is the operating temperature range for the LTC1743IFW#PBF?
The LTC1743IFW#PBF is specified for industrial operation from –40°C to +85°C (I-grade). This range is validated per Absolute Maximum Ratings and Dynamic Performance specifications in the official datasheet, with all key AC parameters-including SNR, SFDR, and aperture jitter-guaranteed across the full interval without derating.
Does the LTC1743IFW#PBF require an external reference voltage?
No, the LTC1743IFW#PBF integrates a precision 2.5 V bandgap reference and difference amplifier. External components are only required for bypassing: 4.7 µF on VCM, 4.7 µF between REFHA–REFLA, and 0.1 µF between REFHA–REFLB and REFLA–REFHB. No external reference IC is needed for standard ±1 V or ±1.6 V operation.
Can the LTC1743IFW#PBF interface directly with a 1.8 V FPGA?
Yes, the LTC1743IFW#PBF supports OVDD from 0.5 V to 5 V. Setting OVDD = 1.8 V configures its D11–D0, CLKOUT, OE, and OF outputs to 1.8 V LVCMOS levels, enabling direct connection to Xilinx Artix-7 or Intel Cyclone V FPGA I/O banks without level shifters or resistive dividers.
How does the SENSE pin configure the input range on the LTC1743IFW#PBF?
The SENSE pin (Pin 1) selects full-scale range: grounded → ±1 V differential; tied to VDD (5 V) → ±1.6 V differential; voltages between 1 V and 1.6 V set proportional ranges (e.g., 1.2 V → ±1.2 V). This resistor-programmable feature allows analog front-end gain to be tuned post-layout without hardware changes.
What is the purpose of the VCM pin on the LTC1743IFW#PBF?
The VCM pin (Pin 2) provides a low-noise, buffered 2.5 V common-mode bias with ±30 ppm/°C tempco. It drives the center tap of RF transformers or VOCM inputs of differential op-amp drivers (e.g., LT6600), ensuring optimal DC bias for AIN+/AIN− and maintaining specified SNR/SFDR performance across temperature.
LTC1743IFW#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:
- 12
- Sampling Rate (Per Second):
- 50M
- 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:
- -
LTC1743IFW#PBF FAQ
1.How can I place an order for LTC1743IFW#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1743IFW#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 LTC1743IFW#PBF reliable?
The price and inventory of LTC1743IFW#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1743IFW#PBF is usually 5 days.
3.What payment methods are accepted for LTC1743IFW#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1743IFW#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1743IFW#PBF?
LTC1743IFW#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1743IFW#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 LTC1743IFW#PBF?
For technical support, including LTC1743IFW#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1743IFW#PBF requirements.
6.How does Aetrix verify that LTC1743IFW#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1743IFW#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 LTC1743IFW#PBF meets industry standards.
7.What is the process for return or replacement of LTC1743IFW#PBF?
All LTC1743IFW#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1743IFW#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 LTC1743IFW#PBF part is unused and in its original packaging.
Return procedure for LTC1743IFW#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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