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Analog Devices Inc. LT1115CSW#PBF
- Part No.:
- LT1115CSW#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LT1115CSW#PBF.pdf
- Description:
- IC AUDIO 1 CIRCUIT 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:202
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Product details
Overview
LT1115CSW#PBF from Analog Devices (acquired Linear Technology) is an ultralow-noise, low-distortion audio operational amplifier in a 16-lead SOIC-Wide package. It delivers 0.9nV/√Hz input voltage noise at 1kHz, 40MHz gain-bandwidth product, 10V/µs slew rate, and <0.002% THD at 10kHz with 7VRMS output into 600Ω - enabling high-fidelity RIAA phonograph preamplifiers and microphone preamps.
For engineers reviewing the LT1115CSW#PBF datasheet, LT1115CSW#PBF pinout, LT1115CSW#PBF application, or LT1115CSW#PBF equivalent, key selection criteria include verified 1.2nV/√Hz max voltage noise, tested current noise (1.2–2.2pA/√Hz), guaranteed 100dB+ CMRR/PSRR over temperature, and compatibility with low-impedance source configurations (<400Ω) for optimal total input-referred noise performance.
Technical Context
The LT1115CSW#PBF uses a precision bipolar input stage optimized for ultralow voltage noise, operating input transistors at ~1mA collector current - resulting in 0.9nV/√Hz typical noise but higher current noise (1.2pA/√Hz typ) than general-purpose op amps. Its architecture requires careful attention to source resistance matching and low-ESR supply bypassing to avoid degrading noise performance.
It is not unity-gain stable without external overcompensation (e.g., 30pF capacitor between pins 5 and 6), and exhibits strong gain-dependent bandwidth behavior: GBW is 40MHz min at AV ≥ 10, but unsuitable for AV = 1 configurations. Output drive capability is rated for ±14.5V swing into 2kΩ and ±11V into 600Ω with ±18V supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Noise Density | 0.9nV/√Hz typ at 1kHz - enables sub-2nV/√Hz total input noise with matched source resistances ≤400Ω |
| THD + Noise | <0.002% at 10kHz, AV = –10, 7VRMS out into 600Ω - meets high-end audio line-level distortion requirements |
| Gain-Bandwidth Product | 40MHz min - supports stable closed-loop operation up to ~4MHz at AV = 10, requiring layout control for stability |
| Slew Rate | 10V/µs min - supports full-swing 20VP-P output at ≥100kHz without slewing-induced distortion |
| Input Offset Voltage | 75µV max over temperature - ensures DC-coupled RIAA networks maintain <0.1dB gain accuracy across frequency |
| CMRR / PSRR | 100dB min over 0°C–70°C - rejects supply ripple and common-mode interference in single-ended audio signal paths |
| Supply Current | 9.3mA typ at ±18V - requires thermal-aware PCB layout due to ~150mW quiescent dissipation in SOIC-Wide package |
Pinout & Package
The LT1115CSW#PBF is housed in a 16-lead plastic SOIC-Wide (SW) package with 0.300-inch body width, JEDEC MS-013AC compliant, θJA = 130°C/W. Pin 1 is marked by notch or cavity; leads are gull-wing, surface-mount compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 8, 9, 10, 11, 12, 13 | No Connect (NC) | Internally unconnected - must remain floating; no routing or grounding permitted |
| 3, 14 | Offset Null (TRIM) | Adjusts input offset via external potentiometer (10kΩ typical); unused pins may be left open |
| 4 | Inverting Input (–IN) | Differential input node; requires symmetric trace routing and guard ring for low-noise applications |
| 5 | Non-Inverting Input (+IN) | Differential input node; matched impedance to –IN critical for CMRR and noise cancellation |
| 6 | Negative Supply (V–) | Return path for negative rail; must be decoupled with ≤1µF low-ESR ceramic + bulk electrolytic |
| 7 | Output (OUT) | Class-A output stage; drives ≤27mA; sensitive to capacitive loading (>100pF requires isolation resistor) |
| 15 | Positive Supply (V+) | Return path for positive rail; separate bypassing required from V– to minimize ground loop noise |
| 16 | Overcompensation (OVERCOMP) | Connects to pin 5 via external capacitor (e.g., 30pF) to stabilize unity-gain or low-gain configurations |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow voltage noise floor | 0.9nV/√Hz typ at 1kHz - lowest among monolithic op amps at time of release, enabling hydrophone and IR detector amplification |
| 100% noise testing | Voltage and current noise individually tested per unit - guarantees spec compliance without derating for production audio systems |
| RIAA response fidelity | Measured deviation <±0.2dB from ideal curve (20Hz–20kHz) in reference phonograph preamp - eliminates need for post-correction EQ |
| High slew rate with low distortion | 10V/µs min slew + <0.002% THD at 10kHz - preserves transient integrity in mastering and broadcast audio chains |
| Low 1/f noise corner | 250Hz current noise corner - maintains wideband noise advantage down to 10Hz for seismic and bio-potential sensing |
Applications
| High-Fidelity Phonograph Preamp | Low-Noise Microphone Preamplifier |
|---|---|
Use Scenario: Amplifying moving-coil cartridge signals (200µV–5mV) with RIAA equalization before ADC or analog distribution. IC Role / Device Role / Timing Role: Primary gain stage and active RIAA network integrator; sets system noise floor and frequency response accuracy. Use Value: Achieves <±0.2dB RIAA deviation and <0.002% THD, eliminating need for digital correction and preserving analog signal integrity. | Use Scenario: Boosting low-level condenser microphone outputs (1–10mV) to line level (1–2V) in studio recording interfaces. IC Role / Device Role / Timing Role: First-stage low-noise amplifier with balanced input; defines SNR and headroom of entire signal chain. Use Value: Delivers 120nV RMS wideband noise (DC–20kHz), enabling >110dB A-weighted SNR with 150Ω source impedance. |
| Instrumentation Amplifier Front-End | Low-Distortion Oscillator Core |
Use Scenario: Conditioning ultra-low-level sensor outputs (e.g., hydrophones, strain gauges) where source impedances are <400Ω. IC Role / Device Role / Timing Role: Differential input buffer and gain-setting stage in 3-op-amp IA topology; determines input-referred noise and CM rejection. Use Value: Enables sub-2nV/√Hz total input noise when paired with matched 100Ω source resistors - critical for underwater acoustic detection. | Use Scenario: Generating ultra-pure sine waves (1kHz–20kHz) for calibration sources and audio test equipment. IC Role / Device Role / Timing Role: Gain element in Wien-bridge or twin-T oscillator; sets harmonic purity and amplitude stability. Use Value: Measures <5ppm THD+N at 1kHz, 20VP-P, outperforming discrete transistor oscillators in lab-grade signal generators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar audio op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC6228IS8#PBF | Lower supply current (3.3mA), wider supply range (±1.25V to ±5.5V), higher GBW (1.4GHz), but 2.7nV/√Hz noise - 3× higher voltage noise than LT1115CSW#PBF | Targeted at portable, battery-powered, wideband instrumentation - not optimized for <1nV/√Hz audio front-ends | Select only if power efficiency or bandwidth outweighs noise priority; requires redesign for noise-sensitive audio paths |
| OPA1612AIDR | 1.1nV/√Hz noise (slightly higher), 40MHz GBW, rail-to-rail output, but lower slew rate (27V/µs) and untested current noise - lacks 100% noise screening | Designed for consumer audio DAC output stages and headphone drivers - less suited for mic preamp input stages | Acceptable for line-level buffering; not recommended for <5mV source signals where LT1115CSW#PBF's tested noise margin is decisive |
Compared with LTC6228IS8#PBF and OPA1612AIDR, the LT1115CSW#PBF remains uniquely specified for ultralow-noise, high-slew audio gain with 100% per-unit noise validation - making it irreplaceable in professional phonograph and studio microphone preamplifier designs where sub-1nV/√Hz performance is non-negotiable.
Availability
LT1115CSW#PBF is available at Aetrix Electronics and suitable for high-fidelity audio preamplifiers, professional microphone interface modules, and precision instrumentation amplifier front-ends requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for LT1115CSW#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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies.
The LT1115CSW#PBF belongs to Linear Technology's legacy precision audio op amp family, engineered specifically for applications demanding the lowest possible voltage noise and distortion in professional audio signal conditioning - including RIAA playback, studio mic preamps, and low-noise sensor interfaces.
FAQ
What is the maximum source resistance for optimal noise performance with the LT1115CSW#PBF?
The LT1115CSW#PBF achieves minimum total input-referred noise with matched source resistances ≤400Ω. At 1kHz, its 0.9nV/√Hz voltage noise dominates below this threshold; above 400Ω, resistor and current noise increase total noise. The datasheet confirms LT1115CSW#PBF is optimal for low-Z sources such as moving-coil cartridges (typically 5–40Ω) and transformer-coupled microphones (150–200Ω).
Can the LT1115CSW#PBF be used in unity-gain configurations?
No - the LT1115CSW#PBF is not unity-gain stable. It requires external overcompensation, typically a 30pF capacitor between pins 5 (+IN) and 16 (OVERCOMP), to achieve stability at AV = 1. Without this capacitor, the LT1115CSW#PBF exhibits peaking and oscillation. The datasheet explicitly warns against using LT1115CSW#PBF in unity-gain followers or inverters without compensation.
What is the operating temperature range for the LT1115CSW#PBF?
LT1115CSW#PBF is specified for an operating temperature range of 0°C to 70°C. This commercial-grade rating matches its SOIC-Wide (SW) package thermal characteristics (TJMAX = 115°C, θJA = 130°C/W). Storage temperature extends from –65°C to +150°C, and lead soldering tolerance is rated for 300°C for 10 seconds.
How does the LT1115CSW#PBF compare to the LT1028 in noise performance?
The LT1115CSW#PBF matches the LT1028's 0.9nV/√Hz typical voltage noise at 1kHz and shares identical 100% per-unit voltage/current noise testing. However, LT1115CSW#PBF offers higher slew rate (10V/µs vs. 5V/µs), greater GBW (40MHz vs. 50MHz), and improved distortion (<0.002% THD vs. <0.003%). Both are optimized for low-Z sources, but LT1115CSW#PBF provides superior dynamic performance in audio gain stages.
Is the LT1115CSW#PBF pin-compatible with other SOIC-16 op amps?
No - the LT1115CSW#PBF has a unique pinout: pins 1, 2, 8–13 are NC; pins 3 and 14 are TRIM; pin 16 is OVERCOMP. This differs fundamentally from standard SOIC-16 op amps (e.g., dual/quad layouts or single op amps with power/inputs/outputs on conventional pins). Direct replacement would require PCB redesign; LT1115CSW#PBF must be laid out per its specific pin map.
LT1115CSW#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Audio
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 15V/µs
- Gain Bandwidth Product:
- 70 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 50 nA
- Voltage - Input Offset:
- 50 µV
- Current - Supply:
- 8.5mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 8 V
- Voltage - Supply Span (Max):
- 40 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
LT1115CSW#PBF FAQ
1.How can I place an order for LT1115CSW#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1115CSW#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 LT1115CSW#PBF reliable?
The price and inventory of LT1115CSW#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1115CSW#PBF is usually 5 days.
3.What payment methods are accepted for LT1115CSW#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1115CSW#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1115CSW#PBF?
LT1115CSW#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1115CSW#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 LT1115CSW#PBF?
For technical support, including LT1115CSW#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1115CSW#PBF requirements.
6.How does Aetrix verify that LT1115CSW#PBF is sourced from the original manufacturer or authorized distributors?
All LT1115CSW#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 LT1115CSW#PBF meets industry standards.
7.What is the process for return or replacement of LT1115CSW#PBF?
All LT1115CSW#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1115CSW#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 LT1115CSW#PBF part is unused and in its original packaging.
Return procedure for LT1115CSW#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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