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Analog Devices Inc. LT1795CFE#PBF
- Part No.:
- LT1795CFE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT1795CFE#PBF.pdf
- Description:
- IC OPAMP CFA 2 CIRCUIT 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,146
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Product details
Overview
LT1795CFE#PBF 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 from ±5V to ±15V supplies - enabling robust central office ADSL/HDSL2 line driver implementations.
For engineers reviewing the LT1795CFE#PBF datasheet, LT1795CFE#PBF pinout, LT1795CFE#PBF application, or LT1795CFE#PBF equivalent, key selection criteria include capacitive-load stability (up to 10,000pF), shutdown-controlled quiescent current adjustment (15–34mA per amplifier), differential distortion performance (–75dBc at 1MHz), and TSSOP-20 thermal enhancement for high-density line card layouts.
Technical Context
The LT1795CFE#PBF employs a current feedback architecture with separate high-impedance noninverting inputs (10MΩ) and low-impedance inverting inputs, enabling wide bandwidth independent of closed-loop gain. Its transresistance gain stage (75–200kΩ) supports fast settling into reactive loads typical of twisted-pair transmission lines.
Integrated shutdown control (SHDN/SHDNREF pins) allows dynamic bias current scaling via external resistor or logic-level switching, reducing supply current from 34mA to <200µA. Thermal shutdown and short-circuit protection ensure rugged operation in telecom line driver applications requiring continuous high-current output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth | 50MHz at AV = 2, RL = 25Ω - supports full-rate downstream ADSL signal integrity up to 2MHz with margin. |
| Slew Rate | 900V/µs - enables clean 20VP-P output swing at 1MHz without slewing distortion. |
| Output Drive | ±500mA - drives 25Ω line loads and 10,000pF capacitive terminations without oscillation. |
| Distortion | –75dBc HD2/HD3 at 1MHz, 20VP-P - meets ADSL spectral mask requirements for low crosstalk. |
| Supply Range | ±5V to ±15V - compatible with legacy telecom power rails and supports ±12V nominal operation. |
| Input Impedance | 10MΩ noninverting input - minimizes loading on preceding filter or DAC stages in line driver chains. |
| Shutdown Current | <200µA per amplifier - reduces system standby power in multi-channel DSLAM line cards. |
Pinout & Package
LT1795CFE#PBF is housed in a thermally enhanced 20-lead plastic TSSOP (FE package) with exposed pad internally connected to V–. The package measures 4.4mm × 6.5mm and supports high-power dissipation via PCB copper plane attachment to the exposed thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 14, 15, 16, 17 | V– (Power Ground) | Common negative supply rail; internally tied to exposed thermal pad for heat conduction. |
| 5, 6 | –IN (Inverting Input) | Low-impedance current-summing node; requires resistive feedback for stable operation. |
| 7, 8 | +IN (Noninverting Input) | High-impedance (10MΩ) voltage-sensing input; differential ESD clamp limits swing to ±5V. |
| 9, 13 | OUT (Output) | Class-AB output stage capable of ±500mA sourcing/sinking into 25Ω loads. |
| 10 | SHDN | Active-low shutdown control; sets quiescent current when biased with external resistor to V+. |
| 11 | SHDNREF | Reference pin for shutdown biasing; used with SHDN to scale supply current or enable logic-level ON/OFF. |
| 12, 18 | V+ | Positive supply rail; bypassing with 1µF + 100nF ceramics near pin is mandatory for low distortion. |
| 19, 20 | COMP | Optional compensation node; connect 0.01µF to OUT to stabilize 0–1000pF capacitive loads. |
Key Features
| Feature | Design Value |
|---|---|
| Dual current feedback topology | Enables constant 50MHz bandwidth across gains ≥2, critical for flat ADSL frequency response. |
| Capacitive-load stability | Stable with CL = 10,000pF; optional COMP network flattens response for 0–1000pF loads. |
| Adjustable quiescent current | 15–34mA per amplifier via single external resistor (RSHDN), enabling power/performance trade-off. |
| Thermal shutdown protection | Activates at TJ = 150°C; cycles slowly (10ms–seconds) to prevent permanent damage during overload. |
| High-output-linearity architecture | –75dBc distortion at 1MHz ensures compliance with ITU-T G.992.1 ADSL spectral masks. |
Applications
| ADSL Central Office Line Driver | Test Equipment Wideband Amplifier |
|---|---|
Use Scenario: Driving twisted-pair telephone lines from DSLAM line cards with full-rate downstream ADSL signals (up to 1.1MHz). IC Role / Device Role / Timing Role: Dual-channel current feedback line driver providing differential output with 500mA drive into 100Ω hybrid transformers. Use Value: Maintains –75dBc harmonic distortion at 1MHz while delivering ±12.5V swing into 25Ω, meeting G.992.1 spectral emission limits. |
Use Scenario: Amplifying fast transient waveforms in automated test equipment requiring wide bandwidth and low distortion. IC Role / Device Role / Timing Role: High-slew-rate buffer amplifier for arbitrary waveform generators and precision signal sources. Use Value: 900V/µs slew rate and 50MHz bandwidth preserve edge fidelity of 10ns rise-time pulses without overshoot. |
| HDSL2 Repeater Amplifier | Video Distribution Amplifier |
Use Scenario: Boosting HDSL2 signals over extended loop lengths in repeater cabinets with limited thermal headroom. IC Role / Device Role / Timing Role: Dual-channel line driver operating at ±12V with shutdown control to manage power in multi-port repeaters. Use Value: Thermal shutdown and short-circuit protection allow continuous operation under fault conditions without field failure. |
Use Scenario: Distributing composite video signals to multiple monitors or recording devices with minimal crosstalk. IC Role / Device Role / Timing Role: High-output-current buffer isolating source from multiple 75Ω coaxial loads. Use Value: Stable with 1000pF+ cable capacitance and delivers 2VPP into 75Ω with <0.1% THD at 5MHz. |
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 |
|---|---|---|---|
| LT1207CFE#PBF | 250mA output drive, 60MHz bandwidth, same TSSOP-20 package and shutdown interface. | Lower drive capability suits lower-power HDSL or ISDN line interfaces, not full-rate ADSL. | Select when 250mA output suffices and higher bandwidth is prioritized over drive strength. |
| LT1497CFE#PBF | 125mA output, 50MHz bandwidth, no shutdown pin; smaller 16-lead SO package. | Limited to low-current buffer or receiver applications; unsuitable for line driver duty cycles. | Choose for space-constrained designs where thermal load and drive demand are minimal. |
Compared with LT1795CFE#PBF, LT1207CFE#PBF trades 500mA drive for higher 60MHz bandwidth but retains identical shutdown programmability, while LT1497CFE#PBF omits shutdown and delivers only 125mA - making it viable only for non-driver roles where thermal density is critical.
Availability
LT1795CFE#PBF is available at Aetrix Electronics and suitable for ADSL line card design, HDSL2 repeater development, and wideband test equipment requiring stable component supply with guaranteed long-term availability.
Supply support for LT1795CFE#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 full technical and manufacturing continuity for all Linear amplifier products.
The LT1795CFE#PBF belongs to Linear's high-speed current feedback amplifier product line, engineered specifically for telecom line driver applications demanding high output current, capacitive-load stability, and thermal robustness in dense PCB layouts.
FAQ
What is the maximum capacitive load the LT1795CFE#PBF can drive stably?
The LT1795CFE#PBF is specified stable with up to 10,000pF capacitive load without compensation. For loads between 0pF and 1000pF, connecting a 0.01µF capacitor between the COMP and OUT pins flattens frequency response and eliminates peaking - extending usable bandwidth to 45MHz with ±1dB flatness. This makes the LT1795CFE#PBF uniquely suited for driving long cables and transformer-coupled line interfaces.
How does the shutdown feature of the LT1795CFE#PBF reduce power consumption?
The LT1795CFE#PBF shutdown feature reduces total supply current per amplifier from 34mA (active) to less than 200µA by disabling internal bias currents. This is achieved by pulling the SHDN pin low relative to SHDNREF (typically 0V), which disables the output stage and input transconductance cells. The transition occurs in ~1.5µs, enabling rapid power gating in multi-channel DSLAM systems to meet energy-efficiency targets.
Can the LT1795CFE#PBF be used with ±12V supplies instead of ±15V?
Yes, the LT1795CFE#PBF operates over ±5V to ±15V, and ±12V is a common and fully supported supply condition. At ±12V, it delivers ±11.5V output swing into 25Ω, maintains 50MHz bandwidth, and achieves –75dBc distortion at 1MHz - matching ADSL line driver requirements while reducing thermal stress versus ±15V operation. Electrical characteristics tables explicitly include ±12V test data.
What is the purpose of the COMP pin on the LT1795CFE#PBF?
The COMP pin on the LT1795CFE#PBF provides optional internal compensation for capacitive loads. When a 0.01µF capacitor is connected between COMP and OUT, it suppresses peaking caused by load capacitance - e.g., eliminating a 6dB peak at 85MHz with 200pF. For purely resistive loads (e.g., 25Ω), leaving COMP open preserves maximum bandwidth (48MHz vs. 32MHz with compensation enabled).
Is the LT1795CFE#PBF pin-compatible with other Linear dual amplifiers like the LT1207?
No, the LT1795CFE#PBF is not pin-compatible with LT1207CFE#PBF despite sharing the TSSOP-20 package. Pin functions differ: LT1795CFE#PBF uses Pins 10/11 for SHDN/SHDNREF and Pins 19/20 for COMP, whereas LT1207CFE#PBF assigns different roles to these pins. PCB layout must be verified against each device's specific pinout diagram - direct substitution requires board revision.
LT1795CFE#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:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LT1795CFE#PBF FAQ
1.How can I place an order for LT1795CFE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1795CFE#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 LT1795CFE#PBF reliable?
The price and inventory of LT1795CFE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1795CFE#PBF is usually 5 days.
3.What payment methods are accepted for LT1795CFE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1795CFE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1795CFE#PBF?
LT1795CFE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1795CFE#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 LT1795CFE#PBF?
For technical support, including LT1795CFE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1795CFE#PBF requirements.
6.How does Aetrix verify that LT1795CFE#PBF is sourced from the original manufacturer or authorized distributors?
All LT1795CFE#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 LT1795CFE#PBF meets industry standards.
7.What is the process for return or replacement of LT1795CFE#PBF?
All LT1795CFE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1795CFE#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 LT1795CFE#PBF part is unused and in its original packaging.
Return procedure for LT1795CFE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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