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Analog Devices Inc. LTC6431AIUF-15#PBF
- Part No.:
- LTC6431AIUF-15#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC6431AIUF-15#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:299
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Product details
Overview
LTC6431AIUF-15#PBF from Analog Devices (formerly Linear Technology) is a high-linearity, fixed-gain 15.5dB single-ended IF amplifier optimized for 20MHz–1700MHz signal chains. It delivers 47dBm OIP3 at 240MHz, 3.33dB noise figure, and >2VP-P linear output swing while drawing only 90mA from a single 5V supply. Its internally 50Ω-matched input/output and SiGe BiCMOS process make it ideal for ADC driver and CATV infrastructure stages.
For engineers reviewing the LTC6431AIUF-15#PBF datasheet, LTC6431AIUF-15#PBF pinout, LTC6431AIUF-15#PBF application, or LTC6431AIUF-15#PBF equivalent, key selection criteria include guaranteed A-grade OIP3 testing at 240MHz, unconditionally stable operation up to 2GHz, thermal diode monitoring capability, and QFN-24 package with exposed pad for RF grounding and thermal management.
Technical Context
The LTC6431AIUF-15#PBF implements a Darlington-pair input stage with shunt-series feedback to simultaneously match 50Ω source/load while minimizing Miller effect. On-chip bias and temperature compensation maintain OIP3 and gain stability across –40°C to 85°C case temperature.
Its open-collector output topology enables high-power delivery without resistive collector biasing losses. The internal 2V DC input bias requires external DC blocking capacitors, and the T_DIODE pin provides calibrated junction temperature monitoring via forward voltage measurement.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Power Gain | 15.5dB typical (50MHz–300MHz), de-embedded to package pins - ensures predictable small-signal amplification without external matching networks |
| OIP3 (A-Grade) | 47dBm at 240MHz, POUT = 2dBm/tone, Δf = 1MHz - guarantees third-order linearity for multi-carrier systems like DOCSIS 3.1 upstream |
| Noise Figure | 3.33dB at 240MHz - enables high dynamic range in receiver front-ends where SNR preservation is critical |
| P1dB | 20.6dBm - defines usable output power ceiling before 1dB compression, supporting >2VP-P linear swing into 50Ω |
| Input/Output Match | S11 < –15dB and S22 < –15dB up to 1.2GHz - eliminates need for external impedance matching components in 50Ω systems |
| Supply Current | 90mA total at VCC = 5V - enables low-power IF amplification with 450mW DC dissipation in compact QFN package |
| Bandwidth | 20MHz to 1700MHz - supports wideband IF sampling architectures including LTE, WiMAX, and cable modem applications |
Pinout & Package
Package: 24-lead (4mm × 4mm) plastic QFN with exposed pad (Pin 25), RoHS-compliant, rated for –40°C to 85°C case temperature. Exposed pad must be soldered to PCB ground plane for thermal and RF performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 24) | Signal Input | Internally biased at 2V DC; requires external DC blocking capacitor; matched to 50Ω from 20MHz–1700MHz |
| OUT (Pin 18) | Amplifier Output | Open-collector configuration requiring RF choke for DC bias feed and RF isolation; matched to 50Ω |
| VCC (Pins 9, 22) | Positive Supply | Accepts 4.75V–5.25V; each pin carries partial supply current; bypass with 1000pF + 0.1µF capacitors |
| GND (Pins 8, 17, 23, 25) | Ground | Multiple dedicated ground pins plus exposed pad (Pin 25); all must connect to low-inductance PCB ground plane |
| T_DIODE (Pin 16) | Temperature Monitoring | Forward-biased diode with 1mA current; voltage drop correlates linearly to die temperature for thermal management |
| DNC (Pins 1–7, 10–15, 19–21) | No Connect | Must remain floating; connection may degrade RF performance or cause instability |
Key Features
| Feature | Design Value |
|---|---|
| A-Grade 100% OIP3 Tested | All LTC6431AIUF-15#PBF units are individually tested at 240MHz for ≥46dBm OIP3 - eliminates post-production linearity screening |
| Internally 50Ω Matched | Eliminates discrete matching networks across 20MHz–1700MHz - reduces BOM count and layout sensitivity |
| Unconditionally Stable | K-factor > 1.07 from 23.5MHz to 2.3GHz - no external stabilization networks required for broadband operation |
| SiGe BiCMOS Process | Enables superior repeatability vs GaAs alternatives - consistent gain, OIP3, and NF across production lots |
| Thermal Diode Integration | T_DIODE pin provides real-time junction temperature feedback - enables closed-loop thermal derating in high-density designs |
Applications
| Direct-Conversion Receiver IF Stage | High-Speed ADC Driver |
|---|---|
Use Scenario: Amplifying downconverted I/Q signals in LTE base station receivers operating at 180–380MHz IF. IC Role / Device Role / Timing Role: Fixed-gain IF amplifier placed between mixer and ADC input, providing gain and driving 50Ω ADC input impedance. Use Value: 15.5dB gain and 47dBm OIP3 preserve EVM in multi-carrier LTE signals; 3.33dB NF maintains system sensitivity. |
Use Scenario: Driving the analog input of 12-bit+ 105MSPS ADCs in software-defined radio front-ends. IC Role / Device Role / Timing Role: Single-ended buffer/amplifier delivering >2VP-P linear swing into ADC's switched-capacitor input. Use Value: >2VP-P linear output swing avoids clipping; 20.6dBm P1dB ensures headroom for transient peaks without distortion. |
| CATV Upstream Amplifier | DOCSIS 3.1 Spectrum Analyzer Front-End |
Use Scenario: Boosting upstream return-path signals (5–85MHz) in HFC node amplifiers prior to fiber transmission. IC Role / Device Role / Timing Role: Low-noise, high-linearity gain block in cascade with other amplifiers to meet SCTE-40 composite second-order (CSO) specs. Use Value: 47dBm OIP3 at 240MHz extrapolates to >40dBm at 85MHz - meets stringent upstream linearity requirements. |
Use Scenario: Wideband signal conditioning in portable spectrum analyzers covering 20MHz–1.7GHz. IC Role / Device Role / Timing Role: First active stage after RF switch/multiplexer, providing flat gain and low added noise across full band. Use Value: 20MHz–1700MHz bandwidth with <0.5dB gain variation enables single-stage calibration; S11 < –15dB minimizes measurement uncertainty. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar IF amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| QPL9547TR13 | 16dB gain, 42dBm OIP3 @ 240MHz, 3.5dB NF, 5V/75mA - lower linearity and higher noise than LTC6431AIUF-15#PBF | Targeted at cost-sensitive consumer broadband; not A-grade tested; narrower 50MHz–1200MHz bandwidth | Select when budget constraints outweigh linearity requirements and OIP3 validation is not mandatory |
| HMC902LP3E | 15dB gain, 43dBm OIP3 @ 240MHz, 3.8dB NF, 5V/100mA - GaAs process, higher current, no integrated thermal diode | Designed for military/aerospace; requires external matching; lacks on-chip temperature monitoring | Select when extended temperature range (–55°C to 105°C) or MIL-STD-883 qualification is required |
Compared with QPL9547TR13 and HMC902LP3E, the LTC6431AIUF-15#PBF offers superior OIP3 margin and guaranteed A-grade testing at 240MHz, integrated thermal monitoring, and broader bandwidth - making it optimal for high-performance cable infrastructure and test equipment where linearity validation and thermal awareness are critical.
Availability
LTC6431AIUF-15#PBF is available at Aetrix Electronics and suitable for CATV infrastructure, wireless base station IF chains, and high-speed data acquisition systems requiring stable component supply, guaranteed linearity performance, and long-term obsolescence management.
Supply support for LTC6431AIUF-15#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 acquired Linear Technology in 2017 and continues its legacy of high-performance analog ICs for signal conditioning, RF, and precision applications.
The LTC6431 family was designed specifically for wideband IF amplification in communications infrastructure - emphasizing linearity, noise, and ease-of-use through internal 50Ω matching and bias compensation.
FAQ
What is the guaranteed OIP3 performance for LTC6431AIUF-15#PBF?
The LTC6431AIUF-15#PBF is A-grade and 100% tested for OIP3 ≥46.0dBm at 240MHz (POUT = 2dBm/tone, Δf = 1MHz). Typical performance is 47dBm under those conditions. This guarantee applies across the full –40°C to 85°C case temperature range and eliminates need for system-level linearity screening.
Does LTC6431AIUF-15#PBF require external matching networks?
No. The LTC6431AIUF-15#PBF features internal 50Ω input and output matching from 20MHz to 1700MHz, verified by S11 < –15dB and S22 < –15dB up to 1.2GHz. External matching is unnecessary in standard 50Ω systems, reducing component count and layout complexity.
How is thermal monitoring implemented on LTC6431AIUF-15#PBF?
The LTC6431AIUF-15#PBF integrates a calibrated T_DIODE on Pin 16. When forward-biased with 1mA, its voltage drop varies linearly with junction temperature (≈ –2mV/°C). This enables real-time die temperature monitoring without external sensors, supporting thermal-aware power management in dense RF modules.
What is the recommended RF choke for LTC6431AIUF-15#PBF output?
For optimal performance across 100–500MHz, a 560nH choke (e.g., Coilcraft 0603LS-561XJL) is recommended - matching the demo board (DC1774A). Choke selection must prioritize low RLOSS and high self-resonant frequency (>2GHz); wirewound types are preferred over multilayer ceramics to maintain broadband isolation.
Is LTC6431AIUF-15#PBF stable without external compensation?
Yes. The LTC6431AIUF-15#PBF is unconditionally stable (K > 1.07) from 23.5MHz to 2.3GHz per measured S-parameters. Its internal feedback architecture eliminates need for external stability networks - though a 60pF/350Ω input network is recommended for low-frequency (<150MHz) stability assurance.
LTC6431AIUF-15#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- -
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 2 GHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- -
- Current - Supply:
- 85.1mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 4.75 V
- Voltage - Supply Span (Max):
- 5.25 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x4)
LTC6431AIUF-15#PBF FAQ
1.How can I place an order for LTC6431AIUF-15#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC6431AIUF-15#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 LTC6431AIUF-15#PBF reliable?
The price and inventory of LTC6431AIUF-15#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC6431AIUF-15#PBF is usually 5 days.
3.What payment methods are accepted for LTC6431AIUF-15#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC6431AIUF-15#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC6431AIUF-15#PBF?
LTC6431AIUF-15#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC6431AIUF-15#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 LTC6431AIUF-15#PBF?
For technical support, including LTC6431AIUF-15#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC6431AIUF-15#PBF requirements.
6.How does Aetrix verify that LTC6431AIUF-15#PBF is sourced from the original manufacturer or authorized distributors?
All LTC6431AIUF-15#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 LTC6431AIUF-15#PBF meets industry standards.
7.What is the process for return or replacement of LTC6431AIUF-15#PBF?
All LTC6431AIUF-15#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC6431AIUF-15#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 LTC6431AIUF-15#PBF part is unused and in its original packaging.
Return procedure for LTC6431AIUF-15#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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