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Analog Devices Inc. LTC6432AIUF-15#PBF
- Part No.:
- LTC6432AIUF-15#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Amplifiers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC6432AIUF-15#PBF.pdf
- Description:
- IC ADC DRIVER 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,895
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Product details
Overview
LTC6432AIUF-15#PBF from Analog Devices is an ultra-high dynamic range differential RF gain block amplifier optimized for driving high-resolution, high-speed ADCs in IF and wideband receiver signal chains. It delivers 15.2 dB fixed power gain, 54.5 dBm OIP3 at 1 MHz (Grade A), and 1 GHz differential bandwidth with internally matched 100Ω differential I/O - enabling direct interface to 16-bit ADCs in spectrum-efficient communications systems.
For engineers reviewing the LTC6432AIUF-15#PBF datasheet, LTC6432AIUF-15#PBF pinout, LTC6432AIUF-15#PBF application, or LTC6432AIUF-15#PBF equivalent, key selection criteria include guaranteed OIP3 performance at 150 MHz (A-grade), low 1/f noise corner down to 100 kHz, insensitivity to VCC variation, and thermal stability across –40°C to 85°C case temperature.
Technical Context
The LTC6432AIUF-15#PBF implements a SiGe-based differential amplifier core with internal Darlington input stage, shunt-series feedback topology, and integrated bias/temperature compensation. Its architecture simultaneously achieves flat gain (±0.3 dB over 100 kHz–1 GHz), low noise (0.8 nV/√Hz input), and exceptional linearity without external matching networks.
All signal paths are fully differential, supporting balanced operation into 100Ω loads. Input and output DC bias is internally generated (2 V), requiring only external DC blocking capacitors. Stability is ensured across frequency and temperature via on-chip feedback networks and de-Qing resistors in the recommended output network.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Fixed Gain | 15.2 dB - enables predictable signal chain gain budgeting without external feedback tuning. |
| OIP3 (1 MHz, Grade A) | 54.5 dBm into 100Ω diff - supports high blocker rejection in dense spectral environments like LTE/5G base stations. |
| –3dB Bandwidth | 2 GHz (de-embedded) - covers full 100 kHz–1.4 GHz operational band with margin for harmonics and spurs. |
| Noise Figure | 3.0 dB at 240 MHz - preserves SNR when driving high-resolution ADCs in sensitive IF stages. |
| Supply | Single 5 V (4.75–5.25 V) - simplifies power design; total current 175 mA typical, insensitive to supply ripple. |
| Output Swing | >2.75 VP-P linear - sufficient headroom for 16-bit ADC full-scale input without clipping. |
| Input/Output Impedance | Internally matched to 100Ω differential - eliminates discrete matching components and layout sensitivity. |
Pinout & Package
Package: 24-lead (4 mm × 4 mm) plastic QFN with exposed pad (Pin 25 = GND). Exposed pad must be soldered to PCB ground plane for thermal management and low-inductance grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN (24) | Positive differential input | Internally biased to 2 V DC; requires external DC blocking capacitor for AC coupling. |
| –IN (7) | Negative differential input | Complementary to +IN; forms fully differential input pair matched for common-mode rejection. |
| +OUT (18) | Positive differential output | Requires RF choke or center-tapped transformer to VCC for DC bias feed and RF isolation. |
| –OUT (13) | Negative differential output | Complementary to +OUT; enables true differential drive to ADC inputs or balun interfaces. |
| VCC (9, 22) | Positive supply | Two pins internally connected; each requires local 1000 pF + 0.1 µF bypassing for broadband decoupling. |
| GND (8, 17, 23, 25) | Ground reference | Multiple dedicated GND pins plus exposed pad ensure low-inductance RF return path and thermal dissipation. |
| +FDBK (19), –FDBK (12) | Feedback terminals | Each requires 1 µF capacitor to respective output pin to extend low-frequency response below 100 kHz. |
| NFILT1 (6), NFILT2 (5) | Bias supply filtering | Each requires 1 µF capacitor to GND to suppress low-frequency noise in internal bias circuitry. |
| T_DIODE (15) | Temperature monitoring | Optional diode output; forward voltage drop correlates with die temperature for system thermal management. |
| DNC (1, 2, 3, 4, 10, 11, 14, 16, 20, 21) | No-connect | Must remain unconnected and floating; connection may degrade linearity and stability. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed OIP3 at 150 MHz (A-grade) | 47.0–50.3 dBm - 100% tested per unit, ensuring consistent third-order distortion performance in production receivers. |
| Low 1/f noise corner | Operates down to 100 kHz with minimal flicker noise - critical for narrowband IF amplification and radar pulse detection. |
| Internally matched 100Ω differential I/O | Eliminates external matching components and layout-dependent tuning - reduces BOM count and design iteration time. |
| Unconditionally stable | No external stabilization required across –40°C to 85°C - verified by K-factor >1 over full frequency and temperature range. |
| Single 5 V supply operation | Supports industrial and telecom power rails without LDOs or charge pumps - lowers system power complexity and cost. |
Applications
| Communications Base Station IF Amplifier | High-Speed ADC Driver for Radar Receivers |
|---|---|
Use Scenario: Amplifying 70–350 MHz IF signals in macrocell LTE/5G base station transceivers prior to digitization. IC Role / Device Role / Timing Role: Differential gain block providing fixed 15.2 dB gain and 54.5 dBm OIP3 to preserve EVM under strong adjacent-channel interferers. Use Value: Enables 16-bit ADC utilization without front-end compression, maintaining >75 dB SFDR across multi-octave IF bands. |
Use Scenario: Driving 125 MSPS+ ADCs in pulsed Doppler radar receivers requiring sub-ns timing fidelity and low phase noise. IC Role / Device Role / Timing Role: Low-noise, low-distortion differential driver delivering >2.75 VP-P linear swing into ADC's 100Ω diff input. Use Value: Maintains <3.0 dB NF at 240 MHz and suppresses second-harmonic distortion to –99.5 dBc, preserving pulse integrity. |
| Wideband Test Instrument Front-End | 50Ω/75Ω Balanced IF Amplifier for CATV DOCSIS |
Use Scenario: Signal conditioning stage in vector signal analyzers covering 100 kHz–1 GHz with calibrated amplitude flatness. IC Role / Device Role / Timing Role: Precision gain block with ±0.3 dB gain flatness and de-embedded S-parameters traceable to calibration standards. Use Value: Reduces system-level correction complexity; enables <±0.25 dB amplitude accuracy without per-unit characterization. |
Use Scenario: Upstream/downstream IF amplification in DOCSIS 4.0 cable modems interfacing to 75Ω coaxial infrastructure via baluns. IC Role / Device Role / Timing Role: 100Ω differential amplifier paired with 1:2 or 2:1 baluns to transform between 50Ω test equipment and 75Ω CATV plant. Use Value: Delivers 48.0 dBm OIP3 at 150 MHz and –96.6 dBc IM3 - meets DOCSIS spectral mask requirements for upstream noise immunity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar differential RF amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| HMC902LP3E | 50Ω single-ended I/O; 24 dB gain; 24 GHz max freq; GaAs process; requires external matching. | Targeted at microwave/mmWave, not IF/baseband; higher gain but narrower low-frequency coverage (no 100 kHz operation). | Select for >6 GHz applications where SiGe bandwidth limits are exceeded; avoid for sub-100 MHz stability-critical designs. |
| LTC6409 | 100Ω diff I/O; 20 dB gain; 1.7 GHz BW; 3.3 V supply; lower OIP3 (42 dBm @ 100 MHz). | Lower power (300 mW vs 850 mW); suited for portable instrumentation; insufficient OIP3 for high-dynamic-range base stations. | Select when 3.3 V supply constraint exists and 42 dBm OIP3 suffices; verify P1dB (19.5 dBm) meets output power needs. |
Compared with HMC902LP3E and LTC6409, the LTC6432AIUF-15#PBF uniquely combines 100 kHz–2 GHz bandwidth, 54.5 dBm OIP3, and 100Ω differential matching in a single 5 V SiGe solution - making it optimal for wideband IF amplification where low-frequency stability and high linearity are jointly required.
Availability
LTC6432AIUF-15#PBF is available at Aetrix Electronics and suitable for communications infrastructure, radar signal conditioning, and wideband test equipment requiring stable component supply with guaranteed A-grade OIP3 performance and industrial temperature support.
Supply support for LTC6432AIUF-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) is a global leader in high-performance analog, mixed-signal, and RF ICs, serving precision instrumentation, communications, and industrial markets.
The LTC6432-15 belongs to Linear Technology's ultra-linear RF amplifier product line, designed specifically for demanding IF and ADC driver applications where simultaneous high gain, wide bandwidth, and exceptional linearity are non-negotiable.
FAQ
What distinguishes the LTC6432AIUF-15#PBF from standard RF amplifiers?
The LTC6432AIUF-15#PBF is distinguished by its SiGe-based differential architecture with internally matched 100Ω I/O, guaranteed OIP3 at 150 MHz (A-grade), and operation down to 100 kHz with low 1/f noise - features uncommon in GaAs or CMOS RF gain blocks. Unlike most wideband amplifiers, it requires no external impedance matching, reducing layout sensitivity and component count while maintaining flat gain and stability across 13 octaves.
Does the LTC6432AIUF-15#PBF require external matching components?
No, the LTC6432AIUF-15#PBF does not require external matching components for its 100Ω differential input and output ports across 100 kHz–1 GHz. Internal matching networks eliminate discrete inductors/capacitors typically needed for 50Ω or 75Ω interfaces. Only mandatory external components are DC blocking capacitors, 1 µF feedback caps (+FDBK/–FDBK), 1 µF bias filter caps (NFILT1/NFILT2), RF chokes, and VCC bypassing - all specified in the datasheet's Test Circuit A.
How is the A-grade specification verified for each LTC6432AIUF-15#PBF unit?
Every LTC6432AIUF-15#PBF unit undergoes 100% production testing for OIP3 at 150 MHz under defined conditions (POUT = 2 dBm/tone, ∆f = 8 MHz, ZO = 100Ω differential). This A-grade guarantee ensures minimum OIP3 of 47.0 dBm, with typical performance reaching 50.3 dBm - a requirement explicitly stated in the "ORDER INFORMATION" section and validated per unit during final test.
Can the LTC6432AIUF-15#PBF operate from a 3.3 V supply?
No, the LTC6432AIUF-15#PBF is specified only for 4.75 V to 5.25 V operation. Its internal bias circuitry, gain stage headroom, and output power capability (P1dB = 22.5 dBm) are optimized for 5 V. Operation at 3.3 V is outside Absolute Maximum Ratings and will result in degraded gain, reduced OIP3, instability, or functional failure. For 3.3 V systems, consider the pin-compatible LTC6409 instead.
What is the role of the T_DIODE pin on the LTC6432AIUF-15#PBF?
The T_DIODE pin (Pin 15) provides a monolithic diode whose forward voltage drop correlates linearly with junction temperature. When biased with ≤1 mA current to ground, it enables real-time die temperature monitoring without external sensors. This feature supports thermal derating, fan control, or system-level fault detection - particularly valuable in sealed RF modules or high-power density base station designs where the LTC6432AIUF-15#PBF operates near its 150°C TJMAX.
LTC6432AIUF-15#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- ADC Driver
- Applications:
- -
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 24-QFN (4x4)
LTC6432AIUF-15#PBF FAQ
1.How can I place an order for LTC6432AIUF-15#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC6432AIUF-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 LTC6432AIUF-15#PBF reliable?
The price and inventory of LTC6432AIUF-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 LTC6432AIUF-15#PBF is usually 5 days.
3.What payment methods are accepted for LTC6432AIUF-15#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC6432AIUF-15#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC6432AIUF-15#PBF?
LTC6432AIUF-15#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC6432AIUF-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 LTC6432AIUF-15#PBF?
For technical support, including LTC6432AIUF-15#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC6432AIUF-15#PBF requirements.
6.How does Aetrix verify that LTC6432AIUF-15#PBF is sourced from the original manufacturer or authorized distributors?
All LTC6432AIUF-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 LTC6432AIUF-15#PBF meets industry standards.
7.What is the process for return or replacement of LTC6432AIUF-15#PBF?
All LTC6432AIUF-15#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC6432AIUF-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 LTC6432AIUF-15#PBF part is unused and in its original packaging.
Return procedure for LTC6432AIUF-15#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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