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Analog Devices Inc. LT1795IFE#PBF
- Part No.:
- LT1795IFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT1795IFE#PBF.pdf
- Description:
- IC OPAMP CFA 2 CIRCUIT 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:726
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Product details
Overview
LT1795IFE#PBF from Analog Devices (formerly Linear Technology) is a dual current feedback amplifier optimized for high-current line driving in xDSL systems. It delivers ±500mA output drive, 50MHz bandwidth at AV = 2 with 25Ω load, 900V/µs slew rate, and operates from ±5V to ±15V supplies. It serves as a central office ADSL/G.lite line driver with low distortion (–75dBc at 1MHz) and stable operation into 10,000pF capacitive loads.
For engineers reviewing the LT1795IFE#PBF datasheet, LT1795IFE#PBF pinout, LT1795IFE#PBF application, or LT1795IFE#PBF equivalent, key selection criteria include dual-channel high-output-current capability, shutdown-controlled quiescent current adjustment, thermal shutdown protection, TSSOP-20 package thermal performance, and compatibility with twisted-pair transmission line termination.
Technical Context
The LT1795IFE#PBF employs current feedback architecture enabling wide bandwidth and fast slew rate independent of closed-loop gain. Its transresistance-based signal path supports high-speed differential line driving with minimal phase shift across frequency.
Each channel features independent shutdown control via SHDN/SHDNREF pins, allowing full shutdown (<200µA per amplifier) or adjustable supply current (15–34mA per amplifier) using external resistors. The device integrates thermal shutdown and short-circuit protection, with junction temperature limit of 150°C and θJA ≈ 40°C/W on 2×2 inch 2 oz copper.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth | 50MHz at AV = 2, RL = 25Ω - enables flat response up to 20MHz for ADSL downstream signals. |
| Slew Rate | 900V/µs - supports fast transient delivery into low-impedance lines without slewing distortion. |
| Output Drive | ±500mA - sufficient to drive 100Ω twisted-pair lines with full-rate ADSL compliance. |
| Distortion | –75dBc at 1MHz, 20VP-P - meets spectral mask requirements for upstream/downstream xDSL transmission. |
| Supply Range | ±5V to ±15V - accommodates legacy central office power rails and supports headroom for large-signal swing. |
| Input Impedance | 10MΩ - minimizes loading on preceding stages in buffer or gain block configurations. |
| Capacitive Load Stability | Stable with CL = 10,000pF - eliminates need for external isolation resistors when driving long PCB traces or cable interfaces. |
Pinout & Package
The LT1795IFE#PBF is housed in a thermally enhanced 20-lead plastic TSSOP (FE package) with exposed pad internally connected to V–. This package enables high power density and efficient heat dissipation in line driver applications requiring compact board area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 14, 15, 16, 17 | V– (Power Ground) | Eight dedicated V– pins provide low-inductance return paths and thermal conduction to PCB ground plane. |
| 5, 13 | OUT (Amplifier Outputs) | Dual outputs configured for differential line driving; each capable of ±500mA continuous current. |
| 6, 12 | –IN (Inverting Inputs) | Current feedback inputs; require resistive feedback networks for stability and gain setting. |
| 7, 11 | +IN (Noninverting Inputs) | High-impedance (10MΩ) inputs accepting differential or single-ended signals with ±13.5V common-mode range. |
| 8, 10 | V+ (Positive Supply) | Accepts +5V to +15V; powers both amplifiers and internal bias circuitry. |
| 9, 19 | COMP (Compensation) | Optional compensation node; connecting 0.01µF to OUT flattens response into capacitive loads up to 1000pF. |
| 18 | SHDN (Shutdown Control) | CMOS-compatible input controlling amplifier bias; <1.4V shuts down, >2.5V enables full operation. |
| 20 | SHDNREF (Shutdown Reference) | Reference node for shutdown threshold; grounded to enable logic-level control of SHDN pin. |
Key Features
| Feature | Design Value |
|---|---|
| Dual high-output-current channels | Each channel delivers ±500mA into 25Ω, enabling simultaneous driving of two xDSL line pairs or redundant paths. |
| Adjustable supply current per amplifier | Configurable from 15mA to 34mA using external resistor on SHDN pin - reduces power by >50% in partial-load conditions. |
| Thermal shutdown protection | Activates at TJ = 150°C and cycles operation to prevent permanent damage during sustained overload or poor heatsinking. |
| Stable with large capacitive loads | Maintains phase margin and avoids peaking up to 10,000pF - eliminates need for series isolation resistors in PCB layout. |
| Low-distortion ADSL line driving | –75dBc HD2/HD3 at 1MHz ensures compliance with ITU-T G.992.1 (G.dmt) spectral masks for full-rate downstream transmission. |
Applications
| ADSL Central Office Line Driver | Test Equipment Wideband Amplifier |
|---|---|
Use Scenario: Driving twisted-pair telephone lines from DSLAM equipment in telecom central offices. IC Role / Device Role / Timing Role: Dual-channel current feedback line driver delivering full-rate downstream ADSL signals (up to 8.448Mbps) with precise amplitude and phase fidelity. Use Value: Enables reliable 15km loop reach with low bit error rate due to high output current, low distortion, and robust short-circuit protection. |
Use Scenario: Amplifying wideband test waveforms (sine, square, pulse) in automated test equipment and signal generators. IC Role / Device Role / Timing Role: High-slew-rate, high-output-current buffer stage ensuring faithful reproduction of fast-edged signals without droop or overshoot. Use Value: Preserves signal integrity up to 20MHz with <0.1% THD+N, supporting calibration-grade instrumentation accuracy. |
| Video Distribution Amplifier | Cable TV Upstream Driver |
Use Scenario: Distributing composite video or RGB signals across multiple monitors or recording devices in broadcast studios. IC Role / Device Role / Timing Role: Dual-channel video line driver maintaining DC-coupled 75Ω impedance matching and flat group delay. Use Value: Delivers 1VPP video signals over 100m coaxial cable with <0.5dB gain flatness to 50MHz and no visible color bleeding. |
Use Scenario: Driving upstream RF signals (5–42MHz) from cable modems into hybrid fiber-coax (HFC) networks. IC Role / Device Role / Timing Role: High-linearity upstream transmitter driver meeting DOCSIS 3.1 spectral purity requirements. Use Value: Achieves –65dBc adjacent channel leakage ratio (ACLR) at 42MHz with ±300mA peak current into 75Ω. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual high-output-current amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1207CSW#PBF | Lower output current (±250mA), higher small-signal BW (60MHz), includes shutdown but no current-adjust feature. | Better suited for medium-drive applications like intermediate-stage buffers where power efficiency is secondary to bandwidth. | Select when 250mA drive suffices and 60MHz flat bandwidth is prioritized over ADSL-compliant output current. |
| LT1497CSW#PBF | Same 50MHz BW and 900V/µs slew, but only ±125mA output drive and no shutdown/current-set functionality. | Targeted at low-power, space-constrained designs such as portable test gear or sensor interface front-ends. | Choose when thermal budget is tight and full 500mA drive is unnecessary; verify capacitive load stability separately. |
Compared with LT1207CSW#PBF and LT1497CSW#PBF, the LT1795IFE#PBF uniquely combines ±500mA drive, adjustable quiescent current, and 10,000pF capacitive load stability - making it the only option qualified for full-rate central office ADSL line driving without external current-boosting circuitry.
Availability
LT1795IFE#PBF is available at Aetrix Electronics and suitable for ADSL infrastructure, test instrumentation, video distribution, and broadband upstream driver applications requiring stable component supply, extended temperature operation, and long-term industrial availability.
Supply support for LT1795IFE#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 maintains its precision analog product portfolio with rigorous qualification and long-term support.
The LT1795IFE#PBF belongs to Linear's high-performance current feedback amplifier family, designed specifically for demanding line driver applications in telecommunications infrastructure where output current, distortion, and thermal robustness are critical.
FAQ
What is the maximum capacitive load the LT1795IFE#PBF can drive while maintaining stability?
The LT1795IFE#PBF is specified stable with up to 10,000pF capacitive load without external compensation. For loads between 0pF and 1000pF, optional compensation via the COMP pin (0.01µF to OUT) further suppresses peaking and extends usable bandwidth. This eliminates the need for series isolation resistors in most PCB and cable interface layouts, preserving signal integrity in ADSL and video applications.
How does the shutdown and current-set function work on the LT1795IFE#PBF?
The LT1795IFE#PBF uses SHDN and SHDNREF pins to control amplifier bias: when SHDN = SHDNREF, both amplifiers shut down (quiescent current <200µA per amplifier). With SHDNREF grounded, applying a voltage to SHDN sets operating current - e.g., a 51kΩ resistor from V+ to SHDN yields ~15mA per amplifier. The relationship is linear: IS ≈ 115 × ISHDN, enabling precise power optimization in multi-channel systems.
What package type and thermal characteristics does the LT1795IFE#PBF have?
The LT1795IFE#PBF uses a 20-lead plastic TSSOP (FE package) with exposed thermal pad internally tied to V–. On a 2×2 inch double-sided 2 oz copper PCB, its junction-to-ambient thermal resistance is approximately 40°C/W. Maximum junction temperature is 150°C, with thermal shutdown engaging above this threshold to protect against sustained overload or inadequate heatsinking in high-power line driver deployments.
Can the LT1795IFE#PBF be used in single-supply configurations?
No - the LT1795IFE#PBF requires dual symmetric supplies (±5V to ±15V) and is not characterized for single-supply operation. Its input common-mode range extends to ±13.5V with ±15V supplies, and output swing reaches ±12.5V into 25Ω, both dependent on balanced rail operation. Attempting single-supply use violates absolute maximum ratings and compromises distortion, bandwidth, and output swing performance.
What is the recommended feedback network for a unity-gain stable configuration with the LT1795IFE#PBF?
The LT1795IFE#PBF is a current feedback amplifier and does not support true unity-gain voltage follower configurations. For minimum gain, use AV = –1 (inverting) with RF = RG = 910Ω and RL = 100Ω, achieving 30MHz bandwidth. Stable operation requires resistive feedback from OUT to –IN; stray capacitance at –IN must be minimized to avoid peaking. For 25Ω loads, typical values are RF = RG = 820Ω yielding 50MHz bandwidth with ≤1.5dB peaking.
LT1795IFE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Current Feedback
- Number of Circuits:
- 2
- Output Type:
- -
- Slew Rate:
- 900V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 65 MHz
- Current - Input Bias:
- 10 µA
- Voltage - Input Offset:
- 3 mV
- Current - Supply:
- 29mA (x2 Channels)
- Current - Output / Channel:
- 1 A
- Voltage - Supply Span (Min):
- 10 V
- Voltage - Supply Span (Max):
- 30 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LT1795IFE#PBF FAQ
1.How can I place an order for LT1795IFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1795IFE#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 LT1795IFE#PBF reliable?
The price and inventory of LT1795IFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1795IFE#PBF is usually 5 days.
3.What payment methods are accepted for LT1795IFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1795IFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1795IFE#PBF?
LT1795IFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1795IFE#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 LT1795IFE#PBF?
For technical support, including LT1795IFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1795IFE#PBF requirements.
6.How does Aetrix verify that LT1795IFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT1795IFE#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 LT1795IFE#PBF meets industry standards.
7.What is the process for return or replacement of LT1795IFE#PBF?
All LT1795IFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1795IFE#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 LT1795IFE#PBF part is unused and in its original packaging.
Return procedure for LT1795IFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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