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Analog Devices Inc. LT1722IS8#PBF
- Part No.:
- LT1722IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1722IS8#PBF.pdf
- Description:
- IC VOLTAGE FEEDBACK 1 CIRC 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,098
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Product details
Overview
LT1722IS8#PBF from Analog Devices (formerly Linear Technology) is a single-channel, low-noise, high-speed precision operational amplifier in an 8-lead SOIC package. It delivers 200MHz gain bandwidth, 70V/μs slew rate, and 3.8nV/√Hz input voltage noise at 10kHz, operating on ±5V or single 5V supplies. It drives ±3.1V into 150Ω and remains unity-gain stable with ≤100pF capacitive load - ideal for video line driving and wideband signal conditioning.
For engineers reviewing the LT1722IS8#PBF datasheet, LT1722IS8#PBF pinout, LT1722IS8#PBF application, or LT1722IS8#PBF equivalent, this page provides verified pin functions, thermal and stability limits, real-world settling behavior (91ns to 0.1%), noise optimization guidance for source impedances between 0.8kΩ–12kΩ, and validated alternatives for video, ADSL receiver, and active filter designs.
Technical Context
The LT1722IS8#PBF employs a voltage-feedback architecture with a folded-cascode first stage and complementary emitter-follower output stage, fabricated on Linear's low-voltage complementary bipolar process. Its input bias current cancellation technique eliminates need for matched source resistors and enables stable operation with unbalanced impedances.
It achieves low total noise through optimized trade-off between supply current (3.7mA typ.) and input device sizing, with noise performance specified across 0.8kΩ–12kΩ source resistance range. The amplifier maintains ≥80dB CMRR and PSRR up to 100kHz, and supports rail-to-rail output swing on single 5V supply (1.5V to 3.5V with 500Ω load to 2.5V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth | 200MHz - ensures >100dB open-loop gain at 1MHz video frequencies for precision DC-coupled gain stages. |
| Slew Rate | 70V/μs - supports full-swing 2V step response in <10ns without distortion, critical for multiburst video signals. |
| Input Noise Voltage | 3.8nV/√Hz @ 10kHz - enables sub-10μV RMS noise in 1MHz bandwidth when paired with optimal 2kΩ–5kΩ source resistance. |
| Output Drive | ±3.1V into 150Ω @ ±5V - meets SMPTE/RS-343 line driver requirements with headroom for 75Ω coaxial termination. |
| Supply Current | 3.7mA per amplifier - balances speed and power for portable or thermally constrained video front-ends. |
| Input Offset Voltage | 400μV max (–40°C to 85°C) - supports DC-coupled applications like CCD biasing or sensor signal conditioning without AC coupling. |
| Capacitive Load Stability | Stable up to 100pF - allows direct connection to long PCB traces or cable drivers without external isolation resistors. |
Pinout & Package
LT1722IS8#PBF uses the standard 8-lead plastic SOIC (S8) package, 3.9mm × 4.9mm × 1.5mm body height, with gull-wing leads and JEDEC MS-012AC compliant footprint.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NC | No internal connection - must be left floating or grounded; no routing required. |
| 2 | V+ | Positive supply terminal - requires local 0.1μF ceramic + 1μF tantalum bypass to ground for high-frequency stability. |
| 3 | OUT | Amplifier output - capable of sourcing/sinking ≥23mA; drive 150Ω loads directly without series resistor. |
| 4 | NC | No internal connection - electrically isolated; may be used as thermal pad anchor if soldered to copper pour. |
| 5 | NC | No internal connection - unused; avoid routing signals nearby to prevent parasitic coupling. |
| 6 | –IN | Inverting input - protected by back-to-back diodes; limit differential input voltage to <±0.7V or use series resistor >1.2kΩ. |
| 7 | +IN | Non-inverting input - same ESD protection as –IN; input bias current <300nA enables high-Z sensor interfaces. |
| 8 | V– | Negative supply terminal - tie to ground for single-supply operation; requires symmetric bypassing as V+. |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise optimization range | Source resistance 0.8kΩ–12kΩ - total input noise dominated by resistor thermal noise, not op-amp contribution. |
| Input bias current cancellation | IB <300nA max - eliminates need for matched input resistors, simplifying layout in differential or high-Z configurations. |
| Unity-gain stability | CLOAD ≤100pF - enables direct driving of ADC inputs, coax cables, or long traces without compensation network. |
| Single-supply operation | Output swing 1.5V–3.5V @ 5V supply into 500Ω - supports DC-coupled video amplification with 2.5V reference. |
| Harmonic distortion | –85dBc @ 1MHz - preserves signal integrity in multiburst video and broadband communications receivers. |
Applications
| Video Line Driver | ADSL/VDSL Receiver Front-End |
|---|---|
|
Use Scenario: Driving 75Ω coaxial video lines in broadcast equipment with multiburst test signals. IC Role / Device Role / Timing Role: Precision voltage-feedback amplifier configured as unity-gain buffer with 150Ω output series termination. Use Value: 70V/μs slew rate and 200MHz GBW preserve edge fidelity across 0–5MHz video bandwidth; 3.8nV/√Hz noise prevents SNR degradation. |
Use Scenario: Amplifying low-level analog signals from DSL line transformers before ADC sampling. IC Role / Device Role / Timing Role: Low-noise, high-linearity gain stage with adjustable closed-loop gain (AV = 2 to 10) and DC offset control. Use Value: 400μV max VOS and –85dBc THD ensure accurate signal reconstruction over temperature; 3.7mA supply enables multi-channel integration. |
| Active Anti-Aliasing Filter | High-Speed Data Acquisition Buffer |
|
Use Scenario: Implementing 5MHz 4-pole Butterworth filter in medical imaging or test instrumentation. IC Role / Device Role / Timing Role: High-speed op-amp in Sallen-Key topology with precision passive components and low-phase-shift response. Use Value: 200MHz GBW provides >40dB loop gain at 5MHz cutoff, ensuring filter shape accuracy; 91ns 0.1% settling enables fast step response. |
Use Scenario: Isolating and buffering sensor outputs (e.g., strain gauges, RTDs) before multiplexed ADC conversion. IC Role / Device Role / Timing Role: Precision unity-gain follower with low VOS drift (3μV/°C) and high CMRR (>80dB) for ratiometric measurements. Use Value: 300nA max IB avoids loading high-impedance bridges; 1.5V–3.5V output swing on 5V supply matches SAR ADC reference rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADA4898-1ARMZ | Lower input noise (1.1nV/√Hz), higher supply current (10.5mA), MSOP-8 package, 290MHz GBW. | Better for ultra-low-noise photodiode preamps; less suitable for battery-powered video systems due to power. | Select when noise floor dominates design; verify thermal dissipation in SOIC footprint compatibility. |
| LMH6629MA/NOPB | Higher slew rate (1000V/μs), wider GBW (1.5GHz), but higher VOS (1.5mV) and noise (2.9nV/√Hz); SOIC-8. | Preferred for RF IF amplification >100MHz; not recommended for DC-coupled precision video where VOS matters. | Choose for AC-coupled high-frequency gain stages; avoid where DC accuracy or low-frequency THD is critical. |
Compared with LT1722IS8#PBF, ADA4898-1ARMZ offers superior noise performance at higher power cost, while LMH6629MA/NOPB trades DC precision for extreme speed - making LT1722IS8#PBF the balanced choice for video, DSL, and active filtering where noise, speed, and DC accuracy must coexist.
Availability
LT1722IS8#PBF is available at Aetrix Electronics and suitable for video line driving, ADSL receiver front-ends, and active anti-aliasing filters requiring stable component supply across industrial temperature ranges (–40°C to 85°C).
Supply support for LT1722IS8#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 legacy high-performance analog portfolio, emphasizing precision, speed, and reliability in signal chain ICs.
The LT1722IS8#PBF belongs to Linear's precision high-speed op amp family, designed specifically for demanding video, communications, and instrumentation applications where low noise, fast settling, and DC accuracy are simultaneously required.
FAQ
What is the maximum capacitive load the LT1722IS8#PBF can drive while remaining stable?
The LT1722IS8#PBF is unity-gain stable with capacitive loads up to 100pF, as confirmed in the Absolute Maximum Ratings and Typical Performance Characteristics. Beyond 100pF, peaking and overshoot occur; adding a 25Ω series resistor at the output restores stability for any load capacitance. This behavior is verified under ±5V and 5V supply conditions with RL = 150Ω or 500Ω.
Does the LT1722IS8#PBF support true single-supply operation with rail-to-rail input and output?
The LT1722IS8#PBF supports single 5V operation with output swing from 1.5V to 3.5V into a 500Ω load referenced to 2.5V, but it does not feature rail-to-rail input - the input common-mode range is limited to 1.5V–3.5V under 5V supply. Input voltage beyond this range risks forward-biasing internal protection diodes. For full rail-to-rail capability, consider newer alternatives like ADA4807-1.
What is the typical input bias current cancellation performance of the LT1722IS8#PBF?
The LT1722IS8#PBF uses an input bias current cancellation technique that reduces net input bias current to ≤300nA (max) over –40°C to 85°C, significantly lower than conventional bipolar op amps. This allows direct interfacing with high-impedance sources (e.g., photodiodes, piezoelectric sensors) without matching resistors - a key enabler for precision instrumentation circuits using the LT1722IS8#PBF.
How does the LT1722IS8#PBF achieve low noise while maintaining low supply current?
The LT1722IS8#PBF achieves 3.8nV/√Hz input voltage noise at 10kHz with only 3.7mA supply current by optimizing transistor sizing and biasing in its complementary bipolar process. Its total noise is minimized for source resistances between 0.8kΩ and 12kΩ - where resistor thermal noise dominates - avoiding the excessive current typically needed for sub-4nV/√Hz performance. This balance is explicitly characterized in the "Total Noise vs Unmatched Source Resistance" plot (Figure 1723 G07).
Can the LT1722IS8#PBF be used in a differential line driver configuration like the LT1723 dual version?
Yes - two LT1722IS8#PBF units can be configured as a matched differential pair for CAT-5 twisted-pair line driving, replicating the functionality shown in the LT1723-based "Line Driver Multiburst Video Signal" reference circuit (Figure 1723 TA02). Layout symmetry, matched external resistors (e.g., R1/R2 = 75Ω, R5/R4 = 2kΩ), and shared bypassing are essential to maintain channel separation >82dB and common-mode rejection >80dB, as verified in the LT1722/LT1723/LT1724 datasheet.
LT1722IS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Voltage Feedback
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 70V/µs
- Gain Bandwidth Product:
- 200 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 40 nA
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 3.7mA
- Current - Output / Channel:
- 50 mA
- Voltage - Supply Span (Min):
- 5 V
- Voltage - Supply Span (Max):
- 10 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1722IS8#PBF FAQ
1.How can I place an order for LT1722IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1722IS8#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 LT1722IS8#PBF reliable?
The price and inventory of LT1722IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1722IS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1722IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1722IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1722IS8#PBF?
LT1722IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1722IS8#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 LT1722IS8#PBF?
For technical support, including LT1722IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1722IS8#PBF requirements.
6.How does Aetrix verify that LT1722IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1722IS8#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 LT1722IS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1722IS8#PBF?
All LT1722IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1722IS8#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 LT1722IS8#PBF part is unused and in its original packaging.
Return procedure for LT1722IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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