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Analog Devices Inc. LT1795ISW#TRPBF
- Part No.:
- LT1795ISW#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LT1795ISW#TRPBF.pdf
- Description:
- IC OPAMP CFA 2 CIRCUIT 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,595
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Product details
Overview
LT1795ISW#TRPBF from Analog Devices (formerly Linear Technology) is a dual current feedback amplifier designed for high-power line driving in xDSL systems. It delivers ±500mA output drive, 50MHz bandwidth at AV = 2 with 25Ω load, 900V/µs slew rate, and operates across ±5V to ±15V supplies - enabling robust ADSL/HDSL2 central office line driver implementations.
For engineers reviewing the LT1795ISW#TRPBF datasheet, LT1795ISW#TRPBF pinout, LT1795ISW#TRPBF application, or LT1795ISW#TRPBF equivalent, key selection criteria include capacitive-load stability up to 10,000pF, adjustable supply current via external resistor, shutdown mode reducing quiescent current to <200µA, and thermal shutdown protection for continuous operation under heavy load.
Technical Context
The LT1795ISW#TRPBF uses current feedback architecture with separate inverting and noninverting inputs, enabling wide bandwidth independent of closed-loop gain. Its transresistance gain stage drives low-impedance loads directly, supporting differential configurations with matched channel separation >80dB.
It integrates dual independent amplifiers sharing common power rails and thermal shutdown circuitry. The SHDN/SHDNREF pins provide precise control over bias current per amplifier - either full shutdown or programmable quiescent current from 15mA to 42mA per channel using a single external resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth | 50MHz at AV = 2, RL = 25Ω - supports full-rate downstream ADSL signal integrity |
| Slew Rate | 900V/µs - enables clean 20VP-P output at 1MHz without slewing distortion |
| Output Drive | ±500mA - sufficient to drive twisted-pair lines with 100Ω characteristic impedance |
| Input Impedance | 10MΩ - minimizes loading on preceding stages in buffer or gain applications |
| Supply Range | ±5V to ±15V - accommodates legacy telecom power rails and industrial ±12V systems |
| Distortion | –75dBc at 1MHz - meets stringent linearity requirements for DSL spectral mask compliance |
| Capacitive Load Stability | Stable with CL = 10,000pF - eliminates need for external isolation resistors in video/cable driver layouts |
Pinout & Package
The LT1795ISW#TRPBF is housed in a thermally enhanced 20-lead TSSOP package (4.4mm width) with exposed pad internally connected to V– for improved heat dissipation. PCB layout requires direct copper connection to the exposed pad for optimal thermal performance (θJA ≈ 40°C/W with 2×2 inch 2 oz copper).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 14, 15, 16, 17 | V– (Ground/Return) | Common negative supply rail and thermal reference; multiple pins reduce IR drop and improve heat conduction |
| 5, 13 | –IN (Inverting Input) | Differential input node for current feedback path; requires low-stray-capacitance routing |
| 6, 12 | +IN (Noninverting Input) | High-impedance input (10MΩ) for signal reference; ESD-clamped to ±5V differential swing |
| 7, 11 | OUT (Output) | Class-AB output stage capable of ±500mA sourcing/sinking into 25Ω loads |
| 8, 10 | V+ (Positive Supply) | Independent positive rail connection per amplifier; bypassing critical for low-distortion operation |
| 9 | COMP | Optional compensation pin - connect to output via 0.01µF capacitor to stabilize 0–1000pF capacitive loads |
| 18 | SHDN | Shutdown control input - logic-level compatible (1.4V threshold); sinks current to set bias level |
| 19 | SHDNREF | Reference node for shutdown biasing - tied to ground for CMOS-compatible control |
| 20 | NC | No internal connection - must be left unconnected or grounded per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent current feedback amplifiers | Enables fully differential line driver topologies without inter-channel crosstalk degradation |
| Programmable supply current per amplifier | Adjustable from 15mA to 42mA using single external resistor - optimizes power vs. bandwidth trade-off |
| Low-distortion output stage | –75dBc HD2/HD3 at 1MHz ensures compliance with ADSL spectral emission limits |
| Thermal shutdown protection | Activates at TJ = 150°C and cycles safely - prevents permanent damage during sustained overload |
| Stable with large capacitive loads | Operates without oscillation up to 10,000pF - simplifies termination design in video and cable applications |
Applications
| ADSL Central Office Line Driver | Test Equipment Output Amplifier |
|---|---|
Use Scenario: Driving twisted-pair telephone lines from DSLAM equipment with full-rate downstream signals up to 12MHz. IC Role / Device Role / Timing Role: Dual-channel current feedback amplifier providing differential output drive and common-mode rejection. Use Value: Delivers ±500mA into 100Ω line impedance while maintaining –75dBc distortion at 1MHz - meeting ITU-T G.992.1 spectral mask requirements. |
Use Scenario: Generating high-fidelity, high-current test waveforms in automated test equipment for semiconductor validation. IC Role / Device Role / Timing Role: Wideband output buffer amplifying arbitrary waveform generator outputs to drive low-Z DUT interfaces. Use Value: 900V/µs slew rate and 50MHz bandwidth preserve fast edge fidelity; ±15V operation supports ±10V output swing into 50Ω loads. |
| Video Distribution Amplifier | Cable TV Signal Booster |
Use Scenario: Buffering and distributing composite video signals across multiple monitors or recording devices in broadcast infrastructure. IC Role / Device Role / Timing Role: High-output-current line driver maintaining signal integrity over long coaxial runs. Use Value: Stable with 10,000pF capacitive load eliminates need for series isolation resistors - reduces component count and preserves DC coupling. |
Use Scenario: Amplifying RF-modulated video/audio signals in CATV headend equipment before distribution over coaxial trunk lines. IC Role / Device Role / Timing Role: Broadband current feedback amplifier operating from DC to 50MHz with flat group delay. Use Value: 50MHz small-signal bandwidth and low harmonic distortion ensure minimal in-band interference and adjacent channel leakage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual current feedback amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1207CSO#PBF | Lower output current (±250mA), higher bandwidth (60MHz), same shutdown/current-set function | Better suited for medium-drive, higher-frequency applications like instrumentation front-ends where power is constrained | Select when 250mA drive suffices and >50MHz bandwidth is prioritized over raw output power |
| LT1497CSO#PBF | Same 500mA drive but lower bandwidth (50MHz only at AV ≥ 5), no COMP pin for capacitive-load compensation | Limited flexibility for driving highly capacitive loads; lacks optional compensation network | Choose only if capacitive-load stability is not required and board space favors SO-20 over TSSOP-20 |
Compared with LT1207CSO#PBF and LT1497CSO#PBF, the LT1795ISW#TRPBF uniquely combines ±500mA drive, 50MHz bandwidth at AV = 2, and integrated capacitive-load compensation - making it the only option qualified for high-power, high-stability xDSL line driver designs requiring both output current and load adaptability.
Availability
LT1795ISW#TRPBF is available at Aetrix Electronics and suitable for ADSL line drivers, test equipment output stages, video distribution systems, and broadband cable signal boosters requiring stable component supply across extended temperature ranges.
Supply support for LT1795ISW#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 acquired Linear Technology in 2017 and maintains full technical and manufacturing continuity for all Linear amplifier products.
The LT1795ISW#TRPBF belongs to Linear's high-speed current feedback amplifier product line, engineered specifically for telecom line driving, video buffering, and precision test equipment where high output current and capacitive-load resilience are critical.
FAQ
What is the operating temperature range for the LT1795ISW#TRPBF?
The LT1795ISW#TRPBF is specified for operation from –40°C to +85°C and is guaranteed across this full industrial temperature range. Its thermal shutdown activates at 150°C junction temperature, providing robust protection during transient overloads or poor heatsinking conditions. This makes the LT1795ISW#TRPBF suitable for deployment in uncontrolled environments such as central office DSLAM cabinets.
How does the SHDN pin function in the LT1795ISW#TRPBF?
The SHDN pin on the LT1795ISW#TRPBF controls amplifier bias current by sinking current proportional to the voltage difference between SHDN and SHDNREF. When SHDN = SHDNREF (typically 0V), the device enters shutdown mode with quiescent current below 200µA per amplifier. With an external resistor between V+ and SHDN, the LT1795ISW#TRPBF achieves programmable supply current from 15mA to 42mA per channel - enabling dynamic power optimization.
Can the LT1795ISW#TRPBF drive 100Ω twisted-pair lines used in xDSL applications?
Yes - the LT1795ISW#TRPBF is explicitly designed for xDSL line driving and delivers ±500mA into 25Ω loads, which corresponds to >±2.5V output swing into 100Ω differential lines. Its low distortion (–75dBc at 1MHz) and stable operation with capacitive loads ensure compliance with ITU-T G.992.x standards. Reference design DC261A demonstrates full-rate ADSL differential driver implementation using the LT1795ISW#TRPBF.
What is the purpose of the COMP pin on the LT1795ISW#TRPBF?
The COMP pin on the LT1795ISW#TRPBF enables optional internal compensation for driving capacitive loads. Connecting a 0.01µF capacitor between COMP and OUT flattens frequency response for loads from 0pF to 1000pF - eliminating peaking and overshoot. For purely resistive loads (e.g., 25Ω), leaving COMP open preserves maximum bandwidth (48MHz vs. 32MHz with compensation enabled), making the feature adaptable to diverse system requirements.
Is the LT1795ISW#TRPBF pin-compatible with other packages in the LT1795 family?
No - the LT1795ISW#TRPBF uses a 20-lead TSSOP package with exposed thermal pad, while LT1795CFE and LT1795IFE use 20-lead SO-20 wide packages. Pin numbering and thermal characteristics differ significantly: TSSOP exposes V– through the underside pad, whereas SO-20 relies on V– pins 4–7 and 14–17 for heat conduction. PCB layout and thermal management must be redesigned when substituting package variants.
LT1795ISW#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-SO
LT1795ISW#TRPBF FAQ
1.How can I place an order for LT1795ISW#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1795ISW#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 LT1795ISW#TRPBF reliable?
The price and inventory of LT1795ISW#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1795ISW#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1795ISW#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1795ISW#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1795ISW#TRPBF?
LT1795ISW#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1795ISW#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 LT1795ISW#TRPBF?
For technical support, including LT1795ISW#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1795ISW#TRPBF requirements.
6.How does Aetrix verify that LT1795ISW#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1795ISW#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 LT1795ISW#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1795ISW#TRPBF?
All LT1795ISW#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1795ISW#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 LT1795ISW#TRPBF part is unused and in its original packaging.
Return procedure for LT1795ISW#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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