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Analog Devices Inc. LTC6401CUD-8#PBF
- Part No.:
- LTC6401CUD-8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Amplifiers
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC6401CUD-8#PBF.pdf
- Description:
- IC ADC DRIVER 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:121
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Product details
Overview
LTC6401CUD-8#PBF from Analog Devices (acquired Linear Technology) is a high-speed, fixed-gain differential ADC driver IC optimized for DC–140MHz signal conditioning in 12–16-bit data acquisition systems. It delivers 2.5V/V (8dB) gain, 2.2GHz –3dB bandwidth, –92dBc IMD3 at 70MHz, 12.1dB noise figure, and 400Ω differential input impedance. It directly drives ADCs such as the LTC2208 without transformers or AC-coupling capacitors.
For engineers reviewing the LTC6401CUD-8#PBF datasheet, LTC6401CUD-8#PBF pinout, LTC6401CUD-8#PBF application, or LTC6401CUD-8#PBF equivalent, key selection criteria include output common-mode voltage adjustability via VOCM, filtered/unfiltered differential outputs (+OUTF/–OUTF vs +OUT/–OUT), shutdown control via ENABLE, and QFN-16 package compatibility with high-density RF layout requirements.
Technical Context
The LTC6401CUD-8#PBF implements a fully differential op amp architecture with on-chip 200Ω/500Ω feedback resistors setting fixed 2.5V/V gain and 400Ω differential input impedance. Its internal common-mode feedback loop operates at ~400MHz, enabling fast rejection of output common-mode disturbances while the VOCM pin provides 1V–1.6V programmable output common-mode voltage with 14MHz small-signal bandwidth.
It features dual output paths: unfiltered outputs (+OUT/–OUT) with 12.5Ω series resistance and filtered outputs (+OUTF/–OUTF) with integrated 50Ω series resistors and 2.7pF shunt capacitance, yielding a 590MHz internal low-pass filter response. The device is unconditionally stable (Kf > 1, B1 > 0) and supports DC- or AC-coupled operation at both inputs and outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | Fixed 2.5V/V (8dB); eliminates external gain-setting components and ensures consistent signal scaling into ADCs. |
| –3dB Bandwidth | 2.2GHz; supports wideband IF sampling up to 140MHz with flat gain and minimal phase distortion. |
| OIP3 @ 70MHz | 50dBm; enables high dynamic range in receiver front-ends where third-order intermodulation must be suppressed. |
| Noise Figure | 12.1dB at 10MHz; balances low-noise performance with high linearity for 16-bit ADC interfacing. |
| Supply Voltage | 2.85V to 3.5V; compatible with standard 3.3V digital supply rails and simplifies power domain partitioning. |
| Supply Current | 45mA typical; delivers high-speed performance at moderate power (135mW), reducing thermal load in dense layouts. |
| Differential Input Impedance | 400Ω; allows direct termination to 50Ω sources using shunt resistors or baluns without impedance mismatch penalties. |
| Output Common Mode Range | 1V to 1.6V, adjustable via VOCM pin; matches common-mode voltage requirements of modern 3V ADCs (e.g., LTC2208 VCM = 1.25V). |
Pinout & Package
Package: 16-lead 3mm × 3mm × 0.75mm plastic QFN (UD package) with exposed pad (Pin 17) connected to V–. Requires soldering exposed pad to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ (Pins 1, 3, 10) | Positive supply input | Three independent connections to 2.85–3.5V rail; each requires local 1000pF + 0.1μF bypassing for high-frequency stability. |
| VOCM (Pin 2) | Output common-mode voltage control | High-impedance input setting 1V–1.6V output common mode; 0.1μF bypass required to suppress noise coupling. |
| V– (Pins 4, 9, 12, 17) | Negative supply / ground reference | Four connections to ground or negative rail; Pin 17 is exposed thermal pad-must be soldered to PCB ground plane. |
| +OUT / –OUT (Pins 5, 8) | Unfiltered differential outputs | 12.5Ω series resistance enables external filtering or matching; used when full bandwidth and minimal phase delay are critical. |
| +OUTF / –OUTF (Pins 6, 7) | Filtered differential outputs | Integrated 50Ω series resistor + 2.7pF capacitor yields 590MHz low-pass response; simplifies 50Ω single-ended interface. |
| ENABLE (Pin 11) | Shutdown control | Active-low logic input (0.8V low / 2.4V high); reduces supply current to ≤3mA in shutdown, enabling power gating in multi-channel systems. |
| +IN (Pins 13, 14) | Positive differential input | Internally shorted pins accept differential or single-ended signals; input common-mode range limited to 1V–1.6V for proper biasing. |
| –IN (Pins 15, 16) | Negative differential input | Internally shorted pins; paired with +IN to form 400Ω differential input impedance node. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-output path architecture | Separate unfiltered (+OUT/–OUT) and filtered (+OUTF/–OUTF) outputs enable trade-off between bandwidth fidelity and EMI suppression without external components. |
| VOCM-controlled common-mode voltage | 1V–1.6V programmable output common mode eliminates need for transformer coupling or level-shifting circuitry when driving 3V ADCs. |
| DC- or AC-coupled I/O flexibility | Supports both coupling methods at inputs and outputs; AC-coupled inputs self-bias ~250mV above VOCM, removing external bias networks. |
| Low-distortion differential gain block | –92dBc IMD3 at 70MHz and –80.5dBc at 140MHz ensure SFDR preservation in high-resolution sampling applications. |
| Compact 3mm × 3mm QFN package | 16-pin footprint minimizes PCB area in space-constrained RF modules and multilayer high-speed designs. |
| Unconditional stability | Kf > 1 and B1 > 0 guarantee stable operation across all source/load impedances without external compensation. |
Applications
| Direct ADC Interface | IF Sampling Receiver |
|---|---|
Use Scenario: Driving the LTC2208 16-bit, 130Msps ADC in a baseband digitization chain with single-ended IF input. IC Role / Device Role / Timing Role: Differential ADC driver providing gain, common-mode level translation, and broadband signal conditioning between analog front-end and ADC input. Use Value: Eliminates external balun and AC-coupling capacitors by supporting DC-coupled operation and VOCM-adjustable output common mode (1.25V matched to LTC2208 VCM). | Use Scenario: Signal conditioning stage in a 70MHz IF receiver for communications infrastructure, requiring high OIP3 and low noise figure. IC Role / Device Role / Timing Role: Low-distortion gain block amplifying and buffering IF signals prior to digitization, maintaining SNR and SFDR over temperature. Use Value: 50dBm OIP3 at 70MHz and 12.1dB noise figure enable >90dB spurious-free dynamic range in LTE/WiMAX receivers. |
| SAW Filter Interfacing | Single-Ended to Differential Conversion |
Use Scenario: Buffering output of a 140MHz SAW bandpass filter before feeding into an ADC, requiring impedance matching and distortion suppression. IC Role / Device Role / Timing Role: High-input-impedance buffer isolating SAW filter from ADC load while preserving amplitude and phase response. Use Value: 400Ω differential input impedance allows precise shunt termination to match SAW filter output impedance, minimizing passband ripple and group delay variation. | Use Scenario: Converting single-ended 50Ω RF source (e.g., mixer output) to differential signal for high-performance ADC input. IC Role / Device Role / Timing Role: Active balun replacement delivering symmetrical differential swing without transformer losses or bandwidth limitations. Use Value: Achieves <–87dBc HD3 at 70MHz with single-ended input using only two external resistors (27.4Ω, 59.0Ω), avoiding balun insertion loss and size penalty. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar differential ADC driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC6401IUD-8#PBF | Identical electrical specs; rated for –40°C to 85°C operating range vs. LTC6401CUD-8#PBF's 0°C to 70°C spec. | Suitable for industrial/outdoor deployments where extended temperature operation is required. | Select LTC6401IUD-8#PBF when full industrial temperature qualification is mandatory; otherwise LTC6401CUD-8#PBF suffices for commercial-grade systems. |
| LTC6400-20 | Higher gain (20dB), higher supply current (90mA), improved linearity (>140MHz), but not pin-compatible. | Better suited for wideband IF stages above 140MHz where OIP3 > 50dBm is critical. | Choose LTC6400-20 only when gain > 8dB and linearity beyond 140MHz are required; board redesign needed due to different pinout and higher power. |
Compared with LTC6401IUD-8#PBF, the LTC6401CUD-8#PBF offers identical performance at lower cost for commercial-temperature applications, while LTC6400-20 provides superior high-frequency linearity at the expense of higher power and non-interchangeable packaging-making it a functional alternative only in redesigned systems.
Availability
LTC6401CUD-8#PBF is available at Aetrix Electronics and suitable for high-speed data acquisition, IF receiver design, SAW filter interfacing, and single-ended-to-differential conversion requiring stable component supply across production volumes.
Supply support for LTC6401CUD-8#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 aerospace, industrial, automotive, and communications markets.
The LTC6401 family-including LTC6401CUD-8#PBF-is designed specifically as low-noise, low-distortion differential ADC drivers for high-resolution sampling systems operating from DC to 140MHz, targeting 12–16-bit data converters in communications and instrumentation.
FAQ
What is the operating temperature range specified for the LTC6401CUD-8#PBF?
The LTC6401CUD-8#PBF is specified for operation from 0°C to 70°C. While characterized and expected to function over –40°C to 85°C, only the 0°C to 70°C range is guaranteed and tested per datasheet specifications. For full industrial temperature compliance, LTC6401IUD-8#PBF is the qualified alternative.
Can the LTC6401CUD-8#PBF drive an ADC without external AC-coupling capacitors?
Yes, the LTC6401CUD-8#PBF can drive an ADC without external AC-coupling capacitors because its output common-mode voltage is independently adjustable via the VOCM pin (1V–1.6V range). This allows direct DC-coupled connection to ADCs like the LTC2208 that require a specific VCM (e.g., 1.25V), eliminating transformer or capacitor-based level-shifting networks.
What is the difference between the +OUT/–OUT and +OUTF/–OUTF pins on the LTC6401CUD-8#PBF?
The +OUT/–OUT pins are unfiltered differential outputs with 12.5Ω series resistance, optimized for maximum bandwidth and minimal phase delay. The +OUTF/–OUTF pins integrate 50Ω series resistors and 2.7pF shunt capacitance, forming an internal 590MHz low-pass filter-ideal for EMI reduction and simplified 50Ω single-ended interfacing without external components.
Does the LTC6401CUD-8#PBF require external gain-setting resistors?
No, the LTC6401CUD-8#PBF does not require external gain-setting resistors. Its gain is internally fixed at 2.5V/V (8dB) by precision on-chip 200Ω/500Ω feedback resistors. This eliminates gain drift, layout sensitivity, and component count-ensuring repeatable performance across units and temperature.
How is the ENABLE pin used to reduce power consumption in the LTC6401CUD-8#PBF?
The ENABLE pin on the LTC6401CUD-8#PBF is an active-low logic input. When pulled high (>2.4V), the device enters shutdown mode, reducing supply current to ≤3mA while placing the outputs in high-impedance state. This enables dynamic power gating in multi-channel systems, extending battery life or lowering thermal load during idle periods.
LTC6401CUD-8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Last Time Buy
- Type:
- ADC Driver
- Applications:
- Data Acquisition
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 16-QFN (3x3)
LTC6401CUD-8#PBF FAQ
1.How can I place an order for LTC6401CUD-8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC6401CUD-8#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 LTC6401CUD-8#PBF reliable?
The price and inventory of LTC6401CUD-8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC6401CUD-8#PBF is usually 5 days.
3.What payment methods are accepted for LTC6401CUD-8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC6401CUD-8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC6401CUD-8#PBF?
LTC6401CUD-8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC6401CUD-8#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 LTC6401CUD-8#PBF?
For technical support, including LTC6401CUD-8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC6401CUD-8#PBF requirements.
6.How does Aetrix verify that LTC6401CUD-8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC6401CUD-8#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 LTC6401CUD-8#PBF meets industry standards.
7.What is the process for return or replacement of LTC6401CUD-8#PBF?
All LTC6401CUD-8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC6401CUD-8#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 LTC6401CUD-8#PBF part is unused and in its original packaging.
Return procedure for LTC6401CUD-8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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