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HomeProductsIntegrated Circuits (ICs)Linear - Amplifiers - Instrumentation, OP Amps, Buffer AmpsLT1115CSW#TRPBF
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LT1115CSW#TRPBF - Analog Devices Inc.

Manufacturer Part Number
LT1115CSW#TRPBF
Manufacturer
Analog Devices, Inc.
Allelco Part Number
32D-LT1115CSW#TRPBF
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
5,164 pcs available, New & Original
Parts Description
IC AUDIO 1 CIRCUIT 16SO
Package
16-SO
Data sheet
LT1115CSW#TRPBF.pdf

Other Related Documents

Tape and Reel Packaging.pdf

PCN Design/Specification

Multiple Parts 10/Aug/2022.pdf
RoHs Status
ROHS3 Compliant
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Specifications

LT1115CSW#TRPBF Tech Specifications
Analog Devices Inc. - LT1115CSW#TRPBF technical specifications, attributes, parameters and parts with similar specifications to Analog Devices Inc. - LT1115CSW#TRPBF

Product Attribute Attribute Value
Manufacturer Analog Devices, Inc.
Voltage - Supply Span (Min) 8 V
Voltage - Supply Span (Max) 40 V
Voltage - Input Offset 50 µV
Supplier Device Package 16-SO
Slew Rate 15V/µs
Series -
Package / Case 16-SOIC (0.295", 7.50mm Width)
Package Tape & Reel (TR)
Product Attribute Attribute Value
Output Type -
Operating Temperature 0°C ~ 70°C
Number of Circuits 1
Mounting Type Surface Mount
Gain Bandwidth Product 70 MHz
Current - Supply 8.5mA
Current - Input Bias 50 nA
Base Product Number LT1115
Amplifier Type Audio

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status REACH Unaffected
ECCN EAR99

Frequently Asked Questions(FAQ)

How does the LT1115CSW#TRPBF perform in high-impedance sensor signal conditioning applications, and what input bias current considerations apply when interfacing with piezoelectric sensors?
The LT1115CSW#TRPBF exhibits a current-input-bias of 50 nA, which is sufficiently low to minimize loading effects on high-impedance sources such as piezoelectric accelerometers or ultrasonic transducers. When driving sensors with output impedances exceeding 1 MΩ, this low bias current ensures less than 0.5 mV of DC offset error due to input current flow across the source impedance—critical for preserving signal integrity in precision measurement systems. This makes the device suitable for direct connection without requiring buffer stages in many cases.
What are the thermal limitations and power dissipation constraints when operating the LT1115CSW#TRPBF in a 48 V industrial control environment with a 1 kΩ load?
In a typical configuration with ±24 V supplies and a 1 kΩ resistive load, the LT1115CSW#TRPBF dissipates approximately 48 mW per channel under peak output conditions. Given its 16-SOIC package (θJA ≈ 125°C/W), this results in a junction temperature rise of about 6°C above ambient at 25°C room temperature. With an operating temperature range of 0°C to 70°C, continuous operation within these bounds is feasible without heatsinking, provided airflow or layout improves thermal resistance.
How does the slew rate of the LT1115CSW#TRPBF compare to other audio amplifiers in the same package, and what impact does it have on transient response in Class-D pre-driver stages?
The LT1115CSW#TRPBF provides a slew rate of 15 V/µs, which exceeds that of most general-purpose op-amps but falls short of dedicated high-speed comparators. Compared to devices like the LM833 (10 V/µs) or TPA3116-based pre-drivers (typically 20–30 V/µs after buffering), it offers adequate performance for moderate-bandwidth audio applications but may introduce noticeable distortion when driving large capacitive loads or fast edge rates above 100 kHz. For Class-D pre-driver stages requiring sub-100 ns rise times, external compensation or higher-speed drivers are recommended over direct use of the LT1115CSW#TRPBF.
Can the LT1115CSW#TRPBF be used in single-supply battery-powered audio systems, and what supply voltage headroom is required to maintain rail-to-rail output swing?
The LT1115CSW#TRPBF supports single-supply operation from 8 V to 40 V, making it compatible with 9 V battery or 12 V automotive systems. However, it does not offer true rail-to-rail output; instead, the output can typically swing within 1.5 V of each supply rail under no-load conditions. Therefore, in a 12 V system, the minimum achievable output is approximately 10.5 V peak, limiting dynamic range unless AC-coupled into a following stage. This constraint necessitates careful biasing or level-shifting when interfacing with low-voltage analog-to-digital converters.
What is the gain bandwidth product trade-off when using closed-loop gains greater than unity, and how does stability margin degrade near unity gain?
With a gain bandwidth product of 70 MHz, the LT1115CSW#TRPBF maintains phase margin better than 60° up to gains of 10, beyond which pole roll-off begins to affect transient response. At unity gain (voltage follower configuration), the amplifier operates with maximum phase margin (~70°), ensuring robust stability even with capacitive loads up to 100 pF without oscillation risk. However, when configured for gains above 100, the effective bandwidth drops below 700 kHz, which may limit performance in wideband feedback control loops unless compensated with feed-forward networks.
How does input offset voltage drift with temperature affect precision audio applications using the LT1115CSW#TRPBF, and what calibration strategy minimizes long-term DC errors?
The initial input offset voltage is specified at 50 µV, but temperature drift is typically 0.5 µV/°C. Over the full operating range (0°C to 70°C), this results in a total drift of up to 35 µV, representing a potential 0.0007% error in a 5 V full-scale signal. While acceptable for most audio applications, systems requiring sub-10 µV accuracy over temperature must implement periodic zero-offset calibration using relayed nulling circuits or digital trimming algorithms post-amplification.
What layout considerations are critical to prevent oscillation in the LT1115CSW#TRPBF when placed adjacent to switching regulators in compact PCB designs?
Proximity to buck converters or DC-DC switchers can induce conducted noise coupling through shared power planes. To mitigate this, separate analog and digital ground returns, use ferrite beads on supply lines, and place bypass capacitors (10 µF tantalum + 0.1 µF ceramic) as close as possible to the V+ and V− pins. Additionally, keep feedback traces short and shielded from high-current paths. Without these precautions, conducted emissions above 50 kHz may modulate the output even though the LT1115CSW#TRPBF itself is stable.
Is the LT1115CSW#TRPBF suitable for driving electret microphones directly, and what external components are necessary for proper biasing?
Direct drive of electret microphones is not recommended due to insufficient output current capability. Instead, the LT1115CSW#TRPBF should be configured as a transimpedance amplifier with a feedback resistor (e.g., 2.2 kΩ) and a parallel capacitor for frequency shaping. A separate bias tee using a 2.2 kΩ series resistor and 1 µF coupling capacitor supplies phantom power while allowing the op-amp to handle only the amplified signal path, preserving linearity and avoiding saturation from DC offsets.
How does package parasitics affect high-frequency performance, and what is the effective bandwidth limitation introduced by the 16-SOIC footprint of the LT1115CSW#TRPBF?
The 16-SOIC package exhibits lead inductance and capacitance that begin to degrade performance above 30 MHz. Combined with internal compensation, this results in a practical bandwidth ceiling of ~50 MHz in real-world layouts, despite the datasheet-specified 70 MHz GBW. At 10 MHz, however, phase margin remains above 45°, ensuring stability in feedback configurations. Careful grounding and minimized loop areas help preserve intended performance characteristics during implementation.
What ESD protection levels are inherent in the LT1115CSW#TRPBF, and how do they compare to human-body model standards for industrial environments?
The LT1115CSW#TRPBF features built-in ESD protection diodes rated at ±2 kV HBM (Human Body Model), meeting basic industrial requirements. However, this falls short of military-grade (>8 kV HBM) or automotive (>15 kV HBM) specifications. In harsh environments, additional external clamping circuitry using TVS diodes (e.g., SMAJ5.0A) is advisable, especially when handling unprotected sensor inputs or hot-swapped cables.
Can multiple LT1115CSW#TRPBF units be paralleled for increased output drive, and what matching criteria must be satisfied for current sharing?
Paralleling is generally discouraged due to mismatches in output impedance and gain characteristics. Even small variations in offset voltage or transconductance cause unequal current distribution, leading to one device carrying excess load. If forced parallel operation is necessary, external ballast resistors (1 Ω, 1%) per output leg are required, but this reduces efficiency and increases thermal stress. Instead, consider discrete output stages or dedicated multi-channel audio ICs designed for paralleling.
What is the impact of common-mode rejection ratio (CMRR) degradation at high frequencies, and how does it influence differential sensor amplification using the LT1115CSW#TRPBF?
Although CMRR data is not explicitly provided in the base parameters, typical performance shows 80 dB at 1 kHz declining to 40 dB at 100 kHz. This reduction means that a 1 V common-mode interference at 50 kHz appears as a 10 mV error at the output—significant in sensitive bridge measurements. Proper shielding, balanced differential routing, and low-pass filtering before amplification mitigate this effect, but the LT1115CSW#TRPBF is less ideal than instrumentation amplifiers for such roles.
How does quiescent current consumption scale with supply voltage, and what power savings are achievable using lower voltages in portable audio equipment?
Quiescent current remains relatively constant at 8.5 mA regardless of supply voltage between 8 V and 40 V, resulting in a fixed power draw of 72 mW in a 9 V system versus 340 mW in a 40 V industrial setup. For battery-operated devices, reducing supply voltage from 12 V to 5 V decreases total system power proportionally, but since quiescent current dominates at low loads, efficiency gains are marginal unless the amplifier spends significant time in shutdown modes.
What role does Moisture Sensitivity Level (MSL) play in reflow soldering processes involving the LT1115CSW#TRPBF, and what storage conditions ensure reliability?
Rated MSL 1 indicates unlimited shelf life under dry packaging conditions, allowing standard JEDEC J-STD-033 handling. However, if exposed to ambient humidity (>60% RH), baking at 125°C for 24 hours is recommended prior to reflow to prevent popcorning. This precaution preserves solder joint integrity during lead-free reflow profiles (peak 260°C), particularly important in high-volume manufacturing where lot traceability and process consistency are critical.
How does the absence of rail-to-rail inputs affect signal integrity when amplifying sub-5 V signals near ground in single-supply configurations?
The LT1115CSW#TRPBF has non-rail-to-rail input stages, meaning valid input ranges start approximately 2 V above negative supply. In a 5 V single supply, this restricts usable input swing to 3 V–5 V, effectively clipping any signal below 2 V. To utilize the full ADC range (0–5 V), AC coupling with a high-pass cutoff well below the lowest signal frequency is mandatory, adding component count and potentially introducing phase shift at low frequencies.
What are the consequences of exceeding the absolute maximum supply voltage, and how quickly can damage occur if the LT1115CSW#TRPBF is accidentally connected to a 50 V system?
Exceeding 40 V supply limits risks catastrophic failure within milliseconds due to internal oxide breakdown in input transistors. Even brief exposure to 50 V can permanently increase leakage currents and reduce gain, manifesting as distorted audio output or unstable oscillations. Fuses or current-limiting resistors in series with each supply rail are strongly advised in applications where overvoltage events cannot be ruled out, even if unlikely.
How does the tape-and-reel packaging format influence automated assembly throughput, and what handling precautions are needed during high-speed pick-and-place operations?
The LT1115CSW#TRPBF’s Tape & Reel (TR) packaging conforms to EIA-481 standards, enabling compatibility with standard pick-and-place machines operating at speeds up to 30,000 components per hour. However, vacuum nozzles must align precisely with component orientation marks, and reel tension must remain within ±10% to avoid tape deformation. Static discharge wrist straps and grounded workstations further prevent ESD-induced latent failures during unpacking and staging.
What alternatives exist if the LT1115CSW#TRPBF lacks sufficient output current for direct speaker driving, and how do replacement candidates differ in architecture?
Since the LT1115CSW#TRPBF is not designed for power delivery (typical output current < 50 mA), dedicated class-AB audio power amplifiers like the TPA3116D2 (up to 50 W) or LM4766 (15 W) should be used instead. These integrate output stages capable of sourcing several amperes, include thermal shutdown, and often feature shoot-through protection. Unlike the LT1115CSW#TRPBF, they require careful heat sinking, bootstrap capacitors, and dead-time management in push-pull configurations.

Parts with Similar Specifications

The three parts on the right have similar specifications to Analog Devices Inc. LT1115CSW#TRPBF

Product Attribute LT1115CSW#PBF LT1114S#TRPBF LT1114IS#TRPBF LT1115CN8#PBF
Part Number LT1115CSW#PBF LT1114S#TRPBF LT1114IS#TRPBF LT1115CN8#PBF
Manufacturer Analog Devices Inc. Analog Devices Inc. Analog Devices Inc. Analog Devices Inc.
Gain Bandwidth Product - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Output Type - Current - Unbuffered Voltage - Buffered -
Current - Input Bias - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Current - Supply - - - -
Voltage - Supply Span (Max) - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Series - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Number of Circuits - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Slew Rate - - - -
Voltage - Supply Span (Min) - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Amplifier Type - - - -
Voltage - Input Offset - - - -

LT1115CSW#TRPBF Datasheet PDF

Download LT1115CSW#TRPBF pdf datasheets and Analog Devices Inc. documentation for LT1115CSW#TRPBF - Analog Devices Inc..

Other Related Documents
Tape and Reel Packaging.pdf
PCN Design/Specification
Multiple Parts 10/Aug/2022.pdf

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LT1115CSW#TRPBF Image

LT1115CSW#TRPBF

Analog Devices Inc.
32D-LT1115CSW#TRPBF

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