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Analog Devices Inc. LTC6420IUDC-20#TRPBF
- Part No.:
- LTC6420IUDC-20#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Amplifiers
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
LTC6420IUDC-20#TRPBF.pdf
- Description:
- IC ADC DRIVER 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,957
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Product details
Overview
LTC6420IUDC-20#TRPBF from Analog Devices (formerly Linear Technology) is a dual, matched, high-speed differential amplifier optimized as an ADC driver for 12–16-bit converters. It delivers fixed 20dB (10V/V) gain, 1.8GHz –3dB bandwidth, ±0.1dB gain matching and ±0.1° phase matching at 100MHz, with rail-to-rail differential output swing and adjustable 1.1V–1.6V output common mode voltage - enabling direct DC-coupled interface to precision ADCs in communications and instrumentation systems.
For engineers reviewing the LTC6420IUDC-20#TRPBF datasheet, LTC6420IUDC-20#TRPBF pinout, LTC6420IUDC-20#TRPBF application, or LTC6420IUDC-20#TRPBF equivalent, key selection criteria include channel-to-channel matching performance, VOCM-controlled common mode compatibility with ADC reference inputs, wideband IMD3 (–84dBc at 100MHz), and QFN-20 package thermal and layout constraints for high-frequency signal integrity.
Technical Context
The LTC6420IUDC-20#TRPBF integrates two fully differential amplifiers with internal 100Ω/1000Ω feedback networks setting fixed 10V/V gain and 200Ω differential input impedance. Each channel features independent VOCM pins and ENABLE control, supporting per-channel shutdown and precise output common mode biasing without external components.
Its architecture enables unconditional stability across loads, with 12.5Ω series output resistors improving robustness, and a 300MHz internal common-mode feedback loop rejecting disturbances while maintaining 15MHz VOCM control bandwidth. The device operates from 2.85V–3.5V supply, drawing 80mA per amplifier in active mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 20dB (10V/V) - fixed, eliminating external gain-setting components and ensuring consistent signal scaling into ADC front-ends. |
| –3dB Bandwidth | 1.8GHz - supports wideband IF sampling up to 300MHz baseband with flat frequency response and minimal group delay variation. |
| Gain Matching | ±0.1dB (typ) - ensures amplitude coherence between I/Q or dual-channel paths critical for diversity receivers and MIMO systems. |
| Phase Matching | ±0.1° at 100MHz - preserves signal orthogonality in quadrature applications, minimizing image rejection degradation. |
| OIP3 | 46dBm at 100MHz - enables high dynamic range operation with low intermodulation distortion when driving sensitive ADCs. |
| Noise Figure | 6.2dB - balances low-noise amplification with high linearity, suitable for weak-signal acquisition in satellite comms and test equipment. |
| Supply Current | 80mA per amplifier - provides high-speed performance within constrained power budgets typical of portable or dense PCB designs. |
| Output Swing | Rail-to-rail differential (up to 5.2VP-P) - maximizes ADC utilization without clipping, even under heavy load conditions. |
Pinout & Package
Package: 20-lead 3mm × 4mm × 0.75mm plastic QFN (UDC) with exposed V– pad (Pin 21) requiring solder connection to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +INA, –INA | Differential Input A | High-impedance, matched pair accepting DC- or AC-coupled signals; input common mode range 1.0V–1.6V. |
| +INB, –INB | Differential Input B | Independent, matched input pair identical in specification to Channel A for dual-path signal processing. |
| +OUTA, –OUTA | Differential Output A | Low-impedance outputs (25Ω typ differential) capable of rail-to-rail swing; VOCMA sets common mode level. |
| +OUTB, –OUTB | Differential Output B | Independent output pair with VOCMB control; enables simultaneous dual ADC channel driving without crosstalk. |
| VOCMA, VOCMB | Output Common Mode Voltage Control | High-impedance inputs setting 1.1V–1.6V output common mode; bypass with 0.1μF capacitor for noise suppression. |
| ENABLEA, ENABLEB | Channel Enable/Shutdown | Active-low logic inputs disabling respective amplifier and placing outputs in high-impedance state; reduces supply current to 1–3mA per channel. |
| V+ A, V+ B | Positive Supply (per channel) | Separate supply pins for each amplifier; require local 1000pF + 0.1μF decoupling to minimize PSRR degradation. |
| V– (Pins 3,4,13,14,21) | Negative Supply / Exposed Pad | All five connections must be tied to same ground potential; exposed pad (Pin 21) is electrically V– and thermally critical. |
Key Features
| Feature | Design Value |
|---|---|
| Dual matched amplifiers | ±0.1dB gain match and ±0.1° phase match at 100MHz ensure coherent I/Q signal paths for zero-IF receivers. |
| Adjustable output common mode | VOCM pins allow direct interfacing to ADC VCM inputs (e.g., LTC2285) without transformers or coupling capacitors. |
| DC- or AC-coupled operation | Supports both baseband and IF architectures; input biasing adapts automatically for AC-coupled sources. |
| Per-channel enable control | Independent ENABLEA/ENABLEB pins permit dynamic power management in multi-channel systems with no PCB layout changes. |
| Unconditionally stable design | No external compensation required; maintains stability across 50Ω–∞ loads due to integrated 12.5Ω output series resistors. |
| Low 1.8GHz bandwidth distortion | IMD3 = –84dBc and HD3 = –88dBc at 100MHz support high-SFDR data acquisition in demanding RF applications. |
Applications
| Direct ADC Interface | I/Q Signal Conditioning |
|---|---|
|
Use Scenario: Driving dual 14-bit, 125Msps ADC (e.g., LTC2285) in a software-defined radio front-end. IC Role / Device Role / Timing Role: Differential ADC driver providing matched gain, phase, and common mode alignment between analog input and ADC reference voltage. Use Value: Eliminates need for baluns or AC-coupling caps, reducing BOM count and board area while preserving SNR and SFDR above 70dB. |
Use Scenario: Processing in-phase and quadrature baseband signals in a satellite modem transceiver. IC Role / Device Role / Timing Role: Dual-channel amplifier maintaining precise amplitude/phase relationship between I and Q paths for accurate constellation mapping. Use Value: ±0.1dB/±0.1° matching minimizes EVM degradation, enabling 256-QAM operation with <2% error vector magnitude. |
| Diversity Receiver Front-End | Broadband Test Instrumentation |
|
Use Scenario: Dual-antenna cellular base station receiver requiring independent but identically characterized signal chains. IC Role / Device Role / Timing Role: Matched dual amplifier enabling channel calibration and coherent combining of received signals. Use Value: 80dB channel separation at 100MHz prevents cross-talk-induced desensitization in adjacent-channel interference scenarios. |
Use Scenario: High-fidelity oscilloscope or spectrum analyzer input stage handling wideband signals up to 300MHz. IC Role / Device Role / Timing Role: Low-noise, low-distortion gain block conditioning signals before digitization with minimal added jitter or harmonic content. Use Value: 1nV/√Hz input-referred noise and 6.2dB noise figure preserve small-signal resolution in automated test equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar differential ADC driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC6400-20#TRPBF | Single-channel, identical 20dB gain and 1.8GHz bandwidth, but lacks second amplifier and VOCM flexibility. | Suitable only for single-path systems; requires two units for dual-channel use, increasing layout area and supply current. | Select when only one high-performance ADC channel is needed and space/power allow discrete duplication. |
| LT6402-20#TRPBF | Lower 300MHz bandwidth, higher 12dB noise figure (vs. 6.2dB), and no VOCM pin - requires external common mode biasing. | Targeted at lower-frequency IF stages (<100MHz); not suitable for direct-coupled, wideband ADC interfaces. | Choose for cost-sensitive, sub-100MHz applications where matching and VOCM control are non-critical. |
Compared with LTC6400-20#TRPBF and LT6402-20#TRPBF, the LTC6420IUDC-20#TRPBF uniquely combines dual matched channels, VOCM-controlled common mode, and 1.8GHz bandwidth in a single compact QFN - making it the only option for space-constrained, wideband, dual-path ADC driver applications requiring guaranteed matching and DC coupling.
Availability
LTC6420IUDC-20#TRPBF is available at Aetrix Electronics and suitable for high-speed data acquisition, satellite communications, and test instrumentation requiring stable component supply, tight gain/phase matching, and reliable QFN thermal performance over –40°C to 85°C.
Supply support for LTC6420IUDC-20#TRPBF 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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing ICs for precision and high-speed applications.
The LTC6420 family was designed specifically for wideband differential signal conditioning in high-resolution ADC interfaces - emphasizing channel matching, VOCM control, and transformerless operation in communications and instrumentation systems.
FAQ
What is the operating temperature range for the LTC6420IUDC-20#TRPBF?
The LTC6420IUDC-20#TRPBF is specified for continuous operation from –40°C to +85°C, with full DC and AC electrical performance guaranteed across this industrial temperature range. This makes the LTC6420IUDC-20#TRPBF suitable for outdoor infrastructure, automotive test gear, and industrial data acquisition systems where ambient conditions vary widely.
Can the LTC6420IUDC-20#TRPBF drive ADCs without external transformers or coupling capacitors?
Yes - the LTC6420IUDC-20#TRPBF supports direct DC-coupled connection to ADCs via its VOCM pins, which set the output common mode voltage from 1.1V to 1.6V. This eliminates transformers and AC-coupling capacitors, reducing component count and phase skew. The LTC6420IUDC-20#TRPBF has been validated driving LTC22xx-series ADCs with matched VCM references.
How does the ENABLE pin function on the LTC6420IUDC-20#TRPBF?
ENABLEA and ENABLEB are independent active-low control inputs: pulling either pin high (≥2.4V) disables its respective amplifier and places outputs in high-impedance state, reducing supply current to 1–3mA per channel. Pulling low (≤0.8V) enables normal operation. These pins must not be left floating and require defined logic levels for predictable behavior.
What is the differential input impedance of the LTC6420IUDC-20#TRPBF?
The LTC6420IUDC-20#TRPBF has a nominal differential input impedance of 200Ω, confirmed by internal 100Ω/1000Ω feedback resistor ratios. When interfacing with 50Ω sources, external shunt termination (e.g., 66.5Ω) or broadband baluns may be used - as documented in the LTC6420IUDC-20#TRPBF datasheet Figures 1–3 - to maintain signal integrity without degrading matching.
Is the LTC6420IUDC-20#TRPBF pin-compatible with other members of the LTC642x family?
No - the LTC6420IUDC-20#TRPBF is not pin-compatible with LTC6421-20 or other variants. While all share the UDC-20 QFN package, pin functions differ: LTC6421-20 uses different VOCM and ENABLE routing, and its internal architecture supports lower power rather than matched dual-channel operation. Substitution requires PCB redesign and validation.
LTC6420IUDC-20#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Last Time Buy
- Type:
- ADC Driver
- Applications:
- Data Acquisition
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 20-QFN (3x4)
LTC6420IUDC-20#TRPBF FAQ
1.How can I place an order for LTC6420IUDC-20#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC6420IUDC-20#TRPBF 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 LTC6420IUDC-20#TRPBF reliable?
The price and inventory of LTC6420IUDC-20#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC6420IUDC-20#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC6420IUDC-20#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC6420IUDC-20#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC6420IUDC-20#TRPBF?
LTC6420IUDC-20#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC6420IUDC-20#TRPBF 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 LTC6420IUDC-20#TRPBF?
For technical support, including LTC6420IUDC-20#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC6420IUDC-20#TRPBF requirements.
6.How does Aetrix verify that LTC6420IUDC-20#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC6420IUDC-20#TRPBF 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 LTC6420IUDC-20#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC6420IUDC-20#TRPBF?
All LTC6420IUDC-20#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC6420IUDC-20#TRPBF, 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 LTC6420IUDC-20#TRPBF part is unused and in its original packaging.
Return procedure for LTC6420IUDC-20#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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