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Analog Devices Inc. LT6411CUD#PBF
- Part No.:
- LT6411CUD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Amplifiers
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LT6411CUD#PBF.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:121
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Product details
Overview
LT6411CUD#PBF from Analog Devices (formerly Linear Technology) is a dual high-speed differential amplifier optimized as an ADC driver with individually selectable gains of +1, +2, and –1. It delivers 650MHz small-signal bandwidth, 3300V/µs slew rate, and –87dBc IM3 at 30MHz while driving 2VP-P differential outputs - enabling high-fidelity signal conditioning for 14-bit, 80Msps ADCs like the LTC2249 in communications and instrumentation systems.
For engineers reviewing the LT6411CUD#PBF datasheet, LT6411CUD#PBF pinout, LT6411CUD#PBF application, or LT6411CUD#PBF equivalent, key selection criteria include its 3mm × 3mm 16-pin QFN package, ±2.25V to ±6.3V supply flexibility, 6ns 0.1% settling time, differential gain/phase accuracy (0.02%/0.01°), and channel isolation (50dB @ 100MHz) - all critical for high-resolution data acquisition and video line driving.
Technical Context
The LT6411CUD#PBF integrates two fully independent amplifiers on a proprietary low-voltage complementary bipolar process. Each channel uses internal 370Ω gain-setting resistors and supports three discrete gain configurations via external input pin connections - no external resistors required. Gain selection is purely hardware-configurable: IN+ and IN– pin terminations define +1 (noninverting), +2 (noninverting), or –1 (inverting) per channel.
It features TTL-compatible enable control (EN pin referenced to DGND), delivering <350µA quiescent current per amplifier when disabled and 8mA when active. The exposed pad (Pin 17) is internally tied to VEE, requiring soldering to PCB ground plane only in single-supply configurations - split-supply layouts must isolate it from system ground to avoid shorting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-Signal Bandwidth | 650MHz –3dB: supports wideband IF sampling up to UHF frequencies without gain peaking or phase distortion. |
| Slew Rate | 3300V/µs: enables clean 2V step response with 6ns 0.1% settling - essential for fast transient fidelity in pulsed radar or burst-mode comms. |
| OIP3 @ 30MHz | 46.5dBm: provides high linearity when driving ADCs with composite 30MHz tones - minimizes intermodulation corruption in multi-carrier systems. |
| Differential Gain/Phase | 0.02% / 0.01°: meets broadcast video timing standards (e.g., NTSC/PAL) for analog video line driving without color shift or geometry error. |
| Supply Range | ±2.25V to ±6.3V (4.5V–12.6V total): allows operation from low-noise ±3V rails or high-headroom ±5V supplies - compatible with both portable and industrial power domains. |
| Channel Separation | 50dB @ 100MHz: ensures minimal crosstalk between channels during simultaneous high-frequency signal processing - critical for dual-channel I/Q demodulators. |
| Enable Current | ≤50µA EN pin leakage: permits direct microcontroller GPIO control without level-shifting or pull-up burden - simplifies power-gating in battery-powered systems. |
Pinout & Package
LT6411CUD#PBF is housed in a 3mm × 3mm, 16-pin plastic QFN package (UD grade) with exposed thermal pad (Pin 17) connected internally to VEE. All supply pins are isolated internally and require individual bypassing. Pin 4 (NC) must remain unconnected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN1+, IN2+ | High-impedance positive inputs (400kΩ) | No internal termination; require external DC bias or AC coupling networks - critical for common-mode voltage control in ADC interfaces. |
| IN1–, IN2– | Internal 370Ω resistor nodes to inverting inputs | Define gain configuration (+1/+2/–1) via connection to signal or ground - floating prohibited due to parasitic AC gain instability. |
| OUT1, OUT2 | Differential output terminals | Capable of ±3.25V swing into 150Ω loads; high-Z when disabled - supports seamless integration with transformer-coupled or resistor-terminated ADC front-ends. |
| VCC (Pins 6, 9, 10) | Positive supply inputs (isolated) | Must be individually bypassed; internal isolation preserves channel separation - prevents supply-induced crosstalk in dual-channel operation. |
| VEE (Pins 1, 2, 3, 7) | Negative supply inputs (isolated) | All four pins require external connection; exposed pad (Pin 17) ties to VEE - mandates proper thermal grounding in single-supply designs. |
| EN | TTL-compatible enable control | Pulled high internally (46kΩ); logic-low (≤0.4V) enables amplifiers - enables dynamic power scaling in time-interleaved or burst-mode systems. |
| DGND | Digital ground reference for EN pin | Must be referenced within –0.5V to +5.5V of EN; not tied to analog ground - avoids enable circuit latch-up in mixed-signal layouts. |
Key Features
| Feature | Design Value |
|---|---|
| No external gain resistors required | Reduces BOM count and layout area; eliminates resistor matching errors and thermal drift - improves gain stability over temperature and signal amplitude. |
| User-selectable ±1, +2 gain per channel | Enables flexible signal routing: e.g., one channel as inverting gain –1 for polarity inversion, the other as noninverting +2 for single-ended-to-differential conversion with system gain of 2. |
| 6ns 0.1% settling time (2V step) | Supports high-throughput ADC sampling without aperture uncertainty - critical for time-of-flight measurement and digital oscilloscope front-ends. |
| 4.2°C/W junction-to-case thermal resistance | Enables sustained full-power operation at ambient temperatures up to 85°C with minimal heatsinking - suitable for compact, sealed industrial enclosures. |
| –77dB SFDR @ 30MHz (2VP-P) | Ensures >12.8 effective bits of dynamic range when driving 14-bit ADCs - preserves resolution in demanding spectral analysis and software-defined radio applications. |
Applications
| Communications IF Sampling | High-Speed Data Acquisition |
|---|---|
|
Use Scenario: Driving the differential inputs of an LTC2249 14-bit, 80Msps ADC in a 30MHz IF receiver chain for LTE base station monitoring. IC Role / Device Role / Timing Role: Dual-channel ADC driver providing matched gain, phase, and delay to preserve I/Q signal integrity across the entire 20MHz channel bandwidth. Use Value: Achieves –87dBc IM3 and 46.5dBm OIP3 at 30MHz, enabling accurate multi-tone analysis without post-processing correction. |
Use Scenario: Conditioning sensor outputs from precision strain gauges and thermocouples prior to digitization in automated test equipment. IC Role / Device Role / Timing Role: High-linearity, low-noise amplifier with 0.02% differential gain accuracy and 0.01° phase matching - preserving analog fidelity across dual-channel measurements. Use Value: Delivers 650MHz bandwidth and 6ns settling to support rapid channel switching and oversampling without settling error. |
| Broadcast Video Line Driver | Medical Ultrasound Beamforming |
|
Use Scenario: Transmitting RGB or YUV component video signals over coaxial cable in professional studio equipment. IC Role / Device Role / Timing Role: Differential video driver with 200MHz ±0.1dB flatness and 0.02%/0.01° gain/phase accuracy - maintaining color fidelity and spatial resolution. Use Value: Meets SMPTE 259M timing jitter and amplitude flatness requirements without external equalization or calibration. |
Use Scenario: Amplifying and phase-aligning echo return signals from 128-element transducer arrays in real-time ultrasound imaging systems. IC Role / Device Role / Timing Role: Low-crosstalk (50dB @ 100MHz), high-bandwidth amplifier enabling precise time-delay beam steering across parallel receive paths. Use Value: Supports >15MHz analog bandwidth per channel with sub-nanosecond inter-channel skew - critical for high-frame-rate B-mode imaging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar differential ADC driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS4561IRGET | Lower bandwidth (400MHz), higher noise (10.5nV/√Hz), fixed +1/+2 gain; requires external resistors for –1 gain. | Less suited for >50MHz IF sampling or video; better for cost-sensitive, lower-frequency DAQ where layout simplicity outweighs performance. | Choose THS4561IRGET if supply voltage is limited to 3.3V and ±0.1dB flatness beyond 100MHz is unnecessary. |
| ADA4940-2ACPZ-R7 | Higher power (12.5mA/ch), lower slew rate (850V/µs), wider supply range (±2.5V to ±5.5V); no integrated enable pin. | Preferred for ultra-low-noise (<4nV/√Hz) applications below 100MHz; unsuitable for burst-mode power gating or sub-10ns settling. | Choose ADA4940-2ACPZ-R7 when optimizing for SNR over speed, and when continuous operation without shutdown is acceptable. |
Compared with THS4561IRGET and ADA4940-2ACPZ-R7, LT6411CUD#PBF uniquely combines 650MHz bandwidth, 3300V/µs slew rate, integrated enable, and resistorless gain selection - making it optimal for high-speed, power-aware, and layout-constrained ADC interface designs.
Availability
LT6411CUD#PBF is available at Aetrix Electronics and suitable for high-speed data acquisition, communications infrastructure, broadcast video, and medical imaging systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LT6411CUD#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 technologies, serving industrial, automotive, communications, and healthcare markets.
The LT6411CUD#PBF belongs to ADI's legacy Linear Technology high-speed amplifier portfolio, engineered specifically for precision differential signal conditioning in ADC front-ends, video transmission, and instrumentation - emphasizing bandwidth, linearity, and layout robustness.
FAQ
What is the maximum supply voltage for LT6411CUD#PBF?
The LT6411CUD#PBF supports a total supply voltage range of ±2.25V to ±6.3V (4.5V to 12.6V). Absolute maximum ratings specify 12.6V between VCC and VEE; exceeding this risks permanent damage. Operation at ±6V is fully characterized and recommended for maximum output swing and linearity.
Can LT6411CUD#PBF drive a 50Ω load directly?
No - the LT6411CUD#PBF is designed to drive high-impedance ADC inputs (e.g., LTC2249) or transformer-coupled loads, not 50Ω coaxial lines. Its specified output swing (±3.25V into 150Ω) and OIP3 values assume high-Z loading; direct 50Ω termination degrades linearity and may exceed output current limits (±70mA).
How is gain configured on LT6411CUD#PBF?
Gain is set per channel by connecting IN+ and IN– pins to signal or ground per Table 1 in the datasheet: IN+ to signal and IN– to ground yields +1; IN+ to signal and IN– to signal yields +2; IN+ to ground and IN– to signal yields –1. No external resistors are needed - the internal 370Ω network defines all three gains.
What is the function of the exposed pad (Pin 17) on LT6411CUD#PBF?
The exposed pad (Pin 17) is internally connected to VEE and must be soldered to the PCB. In single-supply operation (e.g., VCC = 5V, VEE = 0V), it serves as thermal and electrical ground. In split-supply designs (e.g., ±5V), it must connect only to the VEE net - never to system ground - to prevent shorting the negative rail.
Does LT6411CUD#PBF support single-supply operation?
Yes - LT6411CUD#PBF operates from a single 4.5V to 12.6V supply. When using single-supply, DGND must be tied to the same potential as VEE (typically 0V), and input common-mode voltage must stay within VEE + 1V to VCC – 1V (e.g., 1V to 4V for 5V supply) to avoid clipping.
LT6411CUD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Differential
- Applications:
- Driver
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 16-QFN (3x3)
LT6411CUD#PBF FAQ
1.How can I place an order for LT6411CUD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT6411CUD#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 LT6411CUD#PBF reliable?
The price and inventory of LT6411CUD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT6411CUD#PBF is usually 5 days.
3.What payment methods are accepted for LT6411CUD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT6411CUD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT6411CUD#PBF?
LT6411CUD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT6411CUD#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 LT6411CUD#PBF?
For technical support, including LT6411CUD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT6411CUD#PBF requirements.
6.How does Aetrix verify that LT6411CUD#PBF is sourced from the original manufacturer or authorized distributors?
All LT6411CUD#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 LT6411CUD#PBF meets industry standards.
7.What is the process for return or replacement of LT6411CUD#PBF?
All LT6411CUD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT6411CUD#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 LT6411CUD#PBF part is unused and in its original packaging.
Return procedure for LT6411CUD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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