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Analog Devices Inc. LT1886CS8#PBF
- Part No.:
- LT1886CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1886CS8#PBF.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:163
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Product details
Overview
LT1886CS8#PBF from Analog Devices (formerly Linear Technology) is a dual high-speed, high-output-current operational amplifier designed for demanding line driver applications. It delivers ±200mA minimum output current per channel, 700MHz gain bandwidth, and –72dBc harmonic distortion at 1MHz with 4VP-P into 25Ω at AV = 2 - enabling clean signal transmission in xDSL and ADSL modem line drivers.
For engineers reviewing the LT1886CS8#PBF datasheet, LT1886CS8#PBF pinout, LT1886CS8#PBF application, or LT1886CS8#PBF equivalent, key selection criteria include output drive capability into low-impedance loads, stability with 1000pF capacitive loading, low input bias current (≤4µA), wide common-mode input range (±4.5V at ±6V supplies), and thermal performance in the SO-8 package.
Technical Context
The LT1886CS8#PBF employs a complementary bipolar process optimized for high slew rate (200V/µs at ±6V) and low distortion across wide bandwidth. Its balanced high-impedance inputs and low input offset voltage (≤4mV) support precision DC-coupled configurations, while its gain-of-ten stability simplifies compensation for AV ≥ 10 and enables flexible single-resistor or RC network compensation for lower gains.
It operates over ±2.5V to ±6.5V total supply range, supports rail-to-rail output swing (±4.3V into 25Ω at ±6V), and maintains stable operation with reactive loads - critical for coaxial cable and twisted-pair line driving where back-termination and capacitive loading are inherent.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 700MHz at ±6V - enables >100MHz closed-loop bandwidth in AV = 10 configuration for broadband DSL signals. |
| Output Current (min) | ±200mA per amplifier - drives 25Ω loads directly without external buffers, reducing component count in line drivers. |
| Slew Rate | 200V/µs (±6V) - supports fast transient response for DMT-ADSL peak voltages up to 7.5V with minimal slewing distortion. |
| Harmonic Distortion | –72dBc HD2/HD3 at 1MHz, 4VP-P, 25Ω, AV = 2 - meets stringent ADSL upstream spectral mask requirements. |
| Input Offset Voltage | 4mV max - ensures low DC error in precision gain stages and differential driver configurations. |
| Supply Current | 7mA per amplifier - balances performance and power efficiency in thermally constrained SO-8 packages. |
| Capacitive Load Stability | Stable with 1000pF - eliminates need for isolation resistors when driving unterminated cables or PCB traces. |
| Input Noise | 6nV/√Hz voltage noise, 2pA/√Hz current noise - optimal for medium-to-high source impedance designs vs. current-feedback alternatives. |
Pinout & Package
The LT1886CS8#PBF is housed in an 8-lead plastic SO (SO-8) package with exposed V– pin fused to the lead frame for enhanced thermal dissipation (θJA = 80°C/W on 2500mm² 2oz copper board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (V+) | Positive Supply | Accepts +2.5V to +6.5V; must be bypassed with 0.1µF + 1µF ceramic capacitors near pin. |
| 2 (OUT B) | Amplifier B Output | High-current output capable of ±200mA; requires short trace to load for pulse fidelity. |
| 3 (–IN B) | Inverting Input B | Differential pair input; protected by back-to-back diodes; limit differential voltage >0.7V with series resistance. |
| 4 (+IN B) | Noninverting Input B | High-impedance input (≥5MΩ); match DC resistance to –IN B to minimize offset from IB mismatch. |
| 5 (OUT A) | Amplifier A Output | Independent high-drive output; identical specs to OUT B; supports dual-channel line driving. |
| 6 (–IN A) | Inverting Input A | Matches Pin 3; used for feedback networks; avoid >1kΩ feedback resistors to prevent peaking. |
| 7 (+IN A) | Noninverting Input A | Matches Pin 4; bootstrapped in noninverting configurations to preserve input impedance. |
| 8 (V–) | Negative Supply | Accepts –2.5V to –6.5V; fused to lead frame - connect to large copper pour for thermal management. |
Key Features
| Feature | Design Value |
|---|---|
| Gain-of-ten stability | Operates unconditionally stable at AV ≥ 10; avoids external compensation in most DSL gain stages. |
| Low-distortion output stage | –72dBc HD2/HD3 at 1MHz enables compliance with ITU-T G.992.1 upstream spectral masks without post-filtering. |
| Thermally enhanced SO-8 | V– pin fused to lead frame reduces θJA by ~20% vs. standard SO-8 - critical for sustained 200mA output in compact modems. |
| Wide supply range | ±2.5V to ±6.5V operation supports both low-power portable ADSL and high-swing desktop implementations. |
| High capacitive load tolerance | 1000pF stability allows direct connection to long PCB traces or unterminated cables without oscillation risk. |
| Balanced input architecture | 4µA max input bias current and 400nA max input offset current minimize DC errors in differential driver topologies. |
Applications
| ADSL Modem Line Driver | xDSL PCI Card Amplifier |
|---|---|
Use Scenario: Driving 100Ω twisted-pair telephone line in CPE-side ADSL upstream transceiver with 1:2 transformer coupling and back-termination. IC Role / Device Role / Timing Role: Dual-channel line driver providing differential output swing up to ±4.3V into 25Ω reflected load at ±6V supplies. Use Value: Meets –73dBc distortion requirement across full 16VP-P line voltage swing per ITU-T G.992.1, eliminating need for external distortion correction. | Use Scenario: High-density xDSL line card in multi-port DSLAM requiring compact, thermally efficient amplifiers per port. IC Role / Device Role / Timing Role: Dual op-amp delivering 200mA/channel into 50Ω/75Ω coaxial outputs with <50ns settling time for burst-mode signaling. Use Value: SO-8 thermal design enables 8+ channels per 2-layer PCB without forced air cooling, reducing system BOM cost. |
| USB Modem Signal Conditioning | High-Speed Data Acquisition Buffer |
Use Scenario: Transmit path conditioning in USB-based DSL modems where host-supplied 3.3V/5V rails constrain supply headroom. IC Role / Device Role / Timing Role: Single-supply line driver (12V) with ±1.5V output swing into 100Ω at ±2.5V supplies, supporting low-voltage USB interface ICs. Use Value: 133V/µs slew rate and 530MHz GBW maintain signal integrity for 10MHz+ baseband tones despite reduced supply voltage. | Use Scenario: Buffering high-impedance sensor outputs (e.g., piezoelectric, photodiode TIA) before ADC sampling at >10MS/s. IC Role / Device Role / Timing Role: Low-noise, high-slew-rate buffer with 6nV/√Hz input voltage noise and 2pA/√Hz input current noise. Use Value: Outperforms current-feedback amplifiers in medium-Z (>1kΩ) sensor interfaces due to lower integrated noise and no gain-dependent bandwidth trade-off. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-output-current, high-bandwidth op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADA4899-1ARMZ | Single-channel, 1GHz GBW, ±175mA IOUT, 13V/µs slew rate, higher quiescent current (12.5mA). | Requires two devices for dual-channel ADSL; superior bandwidth but lower output current limits drive into 25Ω. | Prefer for single-channel ultra-wideband applications >500MHz where lower distortion at 10MHz+ is critical. |
| LMH6629MA/NOPB | Dual-channel, 750MHz GBW, ±150mA IOUT, 1000V/µs slew rate, higher input bias current (12µA), unstable >1000pF. | Higher slew rate benefits pulse fidelity but lacks 1000pF stability - requires careful layout and termination. | Prefer when extreme slew rate dominates over capacitive load robustness and thermal constraints allow larger packages. |
Compared with ADA4899-1ARMZ and LMH6629MA/NOPB, the LT1886CS8#PBF uniquely balances dual-channel integration, 1000pF stability, ±200mA drive, and SO-8 thermal performance - making it the only option qualified for production ADSL line drivers meeting full ITU-T G.992.1 spectral masks without derating.
Availability
LT1886CS8#PBF is available at Aetrix Electronics and suitable for ADSL modem line drivers, xDSL PCI card amplifiers, and USB modem signal conditioning requiring stable component supply, long-term industrial lifecycle support, and traceable sourcing.
Supply support for LT1886CS8#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, acquired Linear Technology in 2017 to expand precision amplifier and power management portfolios.
The LT1886CS8#PBF belongs to Linear Technology's high-speed, high-output-current op-amp family, engineered specifically for broadband communications infrastructure - emphasizing low distortion, capacitive load stability, and thermal efficiency in space-constrained line driver designs.
FAQ
What is the maximum capacitive load the LT1886CS8#PBF can drive stably?
The LT1886CS8#PBF is specified to remain stable with up to 1000pF capacitive load across all supply voltages and gains. This capability is validated in the datasheet's "Frequency Response vs Capacitive Load" curves (Figure 17) and enables direct driving of unterminated cables or long PCB traces without external isolation resistors - a key advantage for ADSL line driver applications where reactive loading is unavoidable.
Does the LT1886CS8#PBF support single-supply operation?
Yes, the LT1886CS8#PBF supports true single-supply operation down to +2.5V (with ground as V–). At ±2.5V supplies, it delivers ±1.5V output swing into 100Ω and maintains 530MHz gain bandwidth. The input common-mode range extends to within 1V of each rail, allowing rail-to-rail input signal handling in single-supply configurations - essential for USB-powered modem designs.
What is the thermal resistance (θJA) of the LT1886CS8#PBF in its SO-8 package?
The LT1886CS8#PBF has a junction-to-ambient thermal resistance (θJA) of 80°C/W when mounted on a 2500mm² PCB with 2oz copper on both sides - achieved via V– pin fusion to the lead frame. This value degrades to 122°C/W on minimal 180mm² copper area. Engineers must calculate junction temperature using TJ = (PD × θJA) + TA to ensure operation remains below 150°C maximum, especially under sustained ±200mA output conditions.
How does the LT1886CS8#PBF achieve low distortion in ADSL line driving?
The LT1886CS8#PBF achieves –72dBc harmonic distortion at 1MHz through a combination of advanced complementary bipolar process optimization, balanced high-impedance input stage (4µA max IB), and a high-slew-rate (200V/µs), low-output-impedance (0.1Ω) output stage. Its distortion performance is verified in the datasheet's Figure 1a (ADSL Modem Line Driver Distortion) and meets ITU-T G.992.1 upstream spectral mask requirements across full 16VP-P line voltage swing.
Can the LT1886CS8#PBF be used in unity-gain configurations?
No, the LT1886CS8#PBF is not unity-gain stable. It is specified for stable operation at noise gain ≥ 10. For lower gains, external compensation is required - either a single resistor from inverting input to AC ground (Figure 2) or an RC network (Figure 3). The datasheet provides explicit design equations and break-frequency limits (<15MHz) to ensure stability and minimize peaking while preserving distortion performance.
LT1886CS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- -
- Slew Rate:
- 200V/µs
- Gain Bandwidth Product:
- 700 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1.5 µA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 7mA (x2 Channels)
- Current - Output / Channel:
- 800 mA
- Voltage - Supply Span (Min):
- 4 V
- Voltage - Supply Span (Max):
- 13 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1886CS8#PBF FAQ
1.How can I place an order for LT1886CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1886CS8#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 LT1886CS8#PBF reliable?
The price and inventory of LT1886CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1886CS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1886CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1886CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1886CS8#PBF?
LT1886CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1886CS8#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 LT1886CS8#PBF?
For technical support, including LT1886CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1886CS8#PBF requirements.
6.How does Aetrix verify that LT1886CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1886CS8#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 LT1886CS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1886CS8#PBF?
All LT1886CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1886CS8#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 LT1886CS8#PBF part is unused and in its original packaging.
Return procedure for LT1886CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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