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Analog Devices Inc. LT1102CN8
- Part No.:
- LT1102CN8
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1102CN8.pdf
- Description:
- IC INST AMP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,438
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Product details
Overview
LT1102CN8 from Analog Devices (formerly Linear Technology) is a high-speed, precision JFET-input instrumentation amplifier in an 8-lead PDIP package, offering fixed gains of 10 or 100, 30 V/μs slew rate, 35 MHz gain-bandwidth product, and 0.05% max gain error - designed for fast-settling analog signal conditioning in data acquisition and sensor interface applications.
For engineers reviewing the LT1102CN8 datasheet, LT1102CN8 pinout, LT1102CN8 application, or LT1102CN8 equivalent, key selection criteria include guaranteed 0.01% gain accuracy at G=100, sub-10 pA input bias current stability over temperature, ±15V supply operation, and validated performance in multiplexed bridge amplifier systems with <1 Hz lowpass filtering.
Technical Context
The LT1102CN8 uses a two-op-amp architecture with decompensated second-stage amplification optimized for G=10 stability, enabling high slew rate and bandwidth while maintaining common-mode rejection up to 30 kHz. Its FET input stage delivers ultra-low input bias current (≤40 pA at 70°C) without doubling per 10°C rise - a critical differentiator versus bipolar-input competitors.
Gain is internally set to 10 or 100 via laser-trimmed on-chip resistors; no external gain-setting resistor is required. For G=100, a 18 pF capacitor between pins 1 and 2 improves CMRR vs. frequency by 20 dB from 200 Hz to 30 kHz, addressing AC common-mode rejection limitations inherent in fixed-gain topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Slew Rate | 30 V/μs at G=10 - enables full-scale step response within 3 μs for ±10 V output swings. |
| Gain-Bandwidth Product | 35 MHz - supports wideband signal integrity up to ~3.5 MHz at G=10 and ~220 kHz at G=100. |
| Settling Time (0.01%) | 3 μs at G=10 - ensures accurate digitization in 16-bit+ data acquisition systems with multiplexed inputs. |
| Input Bias Current | 40 pA max at 70°C - preserves signal fidelity from high-impedance sources like photodetectors and capacitive sensors. |
| Gain Error | 0.05% max - eliminates need for system-level gain calibration in precision bridge measurement circuits. |
| Input Offset Voltage | 600 μV max (input + output) - contributes ≤0.006% error in ±10 V full-scale measurements. |
| Common-Mode Rejection | 98 dB typical at DC - rejects noise from unshielded industrial sensor wiring without external trimming. |
Pinout & Package
LT1102CN8 is housed in an 8-lead plastic dual in-line package (PDIP), 0.300-inch width, with standard through-hole mounting and industry-compatible footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (–IN) | Differential input node; accepts negative-side signal from bridge or transducer. |
| 2 | Non-Inverting Input (+IN) | Differential input node; accepts positive-side signal; high-impedance FET input (≥10¹² Ω). |
| 3 | Reference (REF) | Output offset reference point; tied to ground or system common to set output DC level. |
| 4 | Negative Supply (V–) | Connects to –15 V rail; supports rail-to-rail input common-mode range up to ±11.5 V. |
| 5 | Output (OUT) | Single-ended amplified output; drives ≥2 kΩ loads with ±13 V swing and 150 mA short-circuit capability. |
| 6 | Positive Supply (V+) | Connects to +15 V rail; supplies internal bias and output stage; supports ±20 V absolute max. |
| 7 | Gain Select (G = 10) | Internally connected for G=10 mode; shorting pins 7–8 configures G=100 (per datasheet AI02). |
| 8 | Gain Select (G = 100) | Internally connected for G=100 mode; shorting pins 1–2 and 7–8 enables G=100 configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed G=10/G=100 architecture | Eliminates external gain resistor tolerance errors and layout sensitivity in production systems. |
| FET input stage with stable bias current | Maintains ≤40 pA input bias at 70°C - avoids thermal drift-induced gain error in uncooled enclosures. |
| No output offset contribution to total error | Removes a major error source present in competing instrumentation amps, simplifying system calibration. |
| 18 pF CMRR compensation network support | Enables >80 dB CMRR to 30 kHz in G=100 mode - critical for AC-coupled industrial sensor interfaces. |
| Indefinite output short-circuit duration | Allows safe operation during transient faults or probe contact events without latch-up or damage. |
Applications
| Bridge Amplifier with <1Hz Filtering | Multiplexed Data Acquisition |
|---|---|
Use Scenario: Amplifying mV-level outputs from strain gauge bridges in weigh scales or pressure sensors with aggressive lowpass filtering to suppress 50/60 Hz line noise. IC Role / Device Role / Timing Role: Precision differential amplifier providing fixed G=100 gain, rejecting common-mode interference before ADC sampling. Use Value: 0.01% gain accuracy and 98 dB CMRR ensure ≤0.01% measurement error despite 10 V common-mode noise on sensor leads. | Use Scenario: Sequentially sampling multiple RTD or thermocouple channels using an analog multiplexer, requiring fast settling between channel switches. IC Role / Device Role / Timing Role: Channel-specific signal conditioner that settles to 0.01% in 3 μs, enabling ≥300 kSPS effective throughput with 16-bit resolution. Use Value: 30 V/μs slew rate and 3 μs settling guarantee full-scale recovery before next sample window, eliminating inter-channel crosstalk. |
| High-Impedance Photodetector Interface | Capacitive Sensor Signal Chain |
Use Scenario: Conditioning nanoamp-level photocurrents from PIN diodes or photomultipliers in analytical instrumentation. IC Role / Device Role / Timing Role: Low-noise, ultra-high-input-impedance amplifier with 2.8 μVP-P 0.1–10 Hz noise and ≤40 pA bias current. Use Value: Sub-picoamp input bias prevents signal loss across >1 GΩ feedback networks, preserving dynamic range in transimpedance configurations. | Use Scenario: Reading variable capacitance from MEMS accelerometers or humidity sensors using charge-transfer or oscillator-based front ends. IC Role / Device Role / Timing Role: Stable gain block following capacitance-to-voltage conversion, rejecting EMI from switching power supplies. Use Value: PSRR of 102 dB and 10¹² Ω input resistance prevent supply ripple and stray coupling from corrupting fF-level capacitance changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar instrumentation amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8428ARZ | G=2000 fixed gain; 35 V/μs slew; 40 nV/√Hz voltage noise; requires ±5 V supplies only. | Better for ultra-low-level signals (nV range); unsuitable for ±15 V legacy systems or G=10 needs. | Select AD8428ARZ when gain >1000 and noise <50 nV/√Hz are mandatory; avoid if G=10 or ±15 V rails are required. |
| INA128UA | G=5–10,000 via external resistor; 0.4 V/μs slew; 25 μV max VOS; operates on ±2.25 to ±18 V. | Flexible gain but slower settling (>10 μs to 0.01%); higher offset limits resolution in high-gain DC bridges. | Select INA128UA for programmable gain and wider supply range; avoid when sub-5 μs settling or <0.1% gain error is required. |
Compared with AD8428ARZ and INA128UA, the LT1102CN8 uniquely balances G=10/G=100 speed (3 μs settling), precision (0.05% gain error), and ±15 V compatibility - making it optimal for legacy industrial DAQ upgrades where board space and supply constraints preclude redesign.
Availability
LT1102CN8 is available at Aetrix Electronics and suitable for precision bridge amplification, multiplexed sensor data acquisition, and high-impedance transducer interfacing requiring stable component supply across extended temperature ranges (0°C to 70°C).
Supply support for LT1102CN8 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 semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT1102CN8 belongs to Linear Technology's legacy precision amplifier portfolio, engineered specifically for high-speed, low-drift instrumentation tasks where FET input performance and fixed-gain reliability outweigh programmability trade-offs.
FAQ
What is the maximum operating temperature range for the LT1102CN8?
The LT1102CN8 is rated for 0°C to 70°C ambient operation, as specified in its ordering option suffix "C". This commercial-grade temperature range is validated per the Absolute Maximum Ratings table and supported by electrical characteristics tested across 0°C ≤ TA ≤ 70°C. The LT1102CN8 does not support extended industrial (–40°C to 85°C) or military (–55°C to 125°C) grades - those require LT1102IN8 or obsolete LT1102AMH variants.
Can the LT1102CN8 be used with single-supply operation?
No, the LT1102CN8 is not characterized or guaranteed for single-supply operation. Its design requires dual ±15 V supplies (±20 V absolute maximum), and its input common-mode range extends only to ±11.5 V - insufficient for rail-to-rail input with a single 30 V supply. Attempting single-supply use risks violating absolute maximum ratings on pins 1, 2, 4, and 6, and will degrade CMRR, PSRR, and output swing. For single-supply instrumentation amplifiers, consider AD8221ARMZ or INA333AIDGKR instead of LT1102CN8.
How is gain selected between 10 and 100 on the LT1102CN8?
Gain is factory-configured and fixed: LT1102CN8 is exclusively a G=10 device. The "CN8" suffix denotes the commercial-grade, 8-lead PDIP package with internal G=10 configuration. To obtain G=100, the part number must be LT1102ACN8 (same package, different internal trim). Pin strapping (e.g., shorting pins 1–2 and 7–8) is not applicable to LT1102CN8 - that method applies only to the LT1102AC variant per Application Information section AI02. Using LT1102CN8 expecting G=100 will result in incorrect gain and potential saturation.
Does the LT1102CN8 require external compensation components?
The LT1102CN8 requires no external compensation for stable G=10 operation. However, when used in G=100 mode (i.e., with LT1102ACN8), a 18 pF capacitor must be placed between pins 1 and 2 to maintain >80 dB CMRR above 200 Hz - as documented in Figure AI01. This capacitor is not needed for LT1102CN8 itself, since it operates only at G=10. Omitting it on a G=100 variant causes >20 dB CMRR degradation at 10 kHz, directly impacting noise rejection in AC-coupled sensor systems.
What is the output short-circuit current capability of the LT1102CN8?
The LT1102CN8 provides ±150 mA continuous short-circuit output current, with indefinite short-circuit duration permitted per Absolute Maximum Ratings. This robust drive strength allows direct interfacing with 75 Ω video lines (±10 V into 75 Ω to 330 kHz) or 200 Ω loads without external buffers. Unlike many instrumentation amplifiers limited to ±20 mA, the LT1102CN8's output stage sustains full current without thermal shutdown or parameter shift - critical for driving capacitive loads (e.g., 2.2 nF) in active filter stages.
LT1102CN8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- Instrumentation
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 30V/µs
- Gain Bandwidth Product:
- 3.5 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 4 pA
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 3.4mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 18 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1102CN8 FAQ
1.How can I place an order for LT1102CN8 through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1102CN8 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 LT1102CN8 reliable?
The price and inventory of LT1102CN8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1102CN8 is usually 5 days.
3.What payment methods are accepted for LT1102CN8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1102CN8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1102CN8?
LT1102CN8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1102CN8 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 LT1102CN8?
For technical support, including LT1102CN8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1102CN8 requirements.
6.How does Aetrix verify that LT1102CN8 is sourced from the original manufacturer or authorized distributors?
All LT1102CN8 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 LT1102CN8 meets industry standards.
7.What is the process for return or replacement of LT1102CN8?
All LT1102CN8 units undergo pre-shipment inspection (PSI). If there is an issue with LT1102CN8, 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 LT1102CN8 part is unused and in its original packaging.
Return procedure for LT1102CN8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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