Analog Devices Inc. LT1920CS8#PBF

Overview

LT1920CS8#PBF from Analog Devices (formerly Linear Technology) is a precision instrumentation amplifier requiring only one external resistor to set gain from 1 to 10,000. It delivers 7.5nV/√Hz input voltage noise at 1kHz, 0.3% max gain error at G=10, and 125µV max input offset voltage, enabling high-accuracy bridge and strain gauge signal conditioning in industrial sensor interfaces.

For engineers reviewing the LT1920CS8#PBF datasheet, LT1920CS8#PBF pinout, LT1920CS8#PBF application, or LT1920CS8#PBF equivalent, this page provides verified specifications, SO-8 package terminal mapping, ESD-hardened design context for medical and barometric transducer use, and validated alternative options for precision analog front-end selection.

Technical Context

The LT1920CS8#PBF implements a modified three-op-amp architecture with laser-trimmed 24.7kΩ internal resistors and superbeta NPN input transistors, achieving 2nA max input bias current and 200GΩ input resistance. Its gain equation G = 1 + (49.4kΩ/RG) enables precise programmability while maintaining CMRR ≥95dB (G=10) and PSRR ≥100dB (G=10) across ±2.3V to ±18V supplies.

Input stage transconductance scales with programmed gain, preserving bandwidth-to-noise trade-offs: 800kHz at G=10, 12kHz at G=1000. The REF pin establishes output reference potential, and the device supports single-supply operation when REF is tied to V–, provided inputs remain within specified common-mode range and output swing constraints.

Key Specifications

Pinout & Package

LT1920CS8#PBF is housed in an 8-lead plastic SO (Small Outline) package, 0.150-inch body width, with gull-wing leads compliant to JEDEC MS-012. Thermal resistance θ_JA = 190°C/W enables operation up to 85°C ambient without heatsinking in compact PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar instrumentation amplifier applications.

Compared with LT1167CN8#PBF and AD8421ARZ, the LT1920CS8#PBF offers the optimal balance of low power (1.3mA), single-resistor configurability, and certified ESD immunity - making it the preferred choice for cost-sensitive, field-deployed sensor nodes where layout simplicity and ruggedness outweigh ultra-low-noise or ultra-high-speed requirements.

Availability

LT1920CS8#PBF is available at Aetrix Electronics and suitable for bridge amplifiers, strain gauge interfaces, thermocouple signal chains, and medical biopotential monitoring requiring stable component supply across automotive, industrial, and healthcare OEM programs.

Supply support for LT1920CS8#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) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving precision instrumentation, industrial automation, and healthcare markets.

The LT1920CS8#PBF belongs to Linear's precision instrumentation amplifier product line, designed specifically for low-power, high-accuracy sensor signal conditioning in environments demanding robustness, ease of calibration, and guaranteed DC performance.

FAQ

What is the maximum capacitive load the LT1920CS8#PBF can drive stably?

The LT1920CS8#PBF is characterized to drive capacitive loads up to 1000pF in any gain configuration without oscillation or overshoot. This capability eliminates the need for output isolation resistors in ADC driver applications and simplifies PCB layout for high-resolution data acquisition systems. Stability is maintained across the full gain range (G=1 to 10,000) and supply voltage range (±2.3V to ±18V), as confirmed in the Typical Performance Characteristics section (Figure 1920 G25).

How does the LT1920CS8#PBF achieve its 0.3% gain error specification at G=10?

The LT1920CS8#PBF achieves 0.3% max gain error at G=10 through laser trimming of its internal 24.7kΩ resistors (R1 and R2) and precise matching of input transistors Q1/Q2. This trimming ensures the gain equation G = 1 + (49.4kΩ/RG) holds with minimal deviation, even across temperature and supply variations. The specification is guaranteed over the full industrial temperature range (–40°C to 85°C) and applies to the LT1920IS8 grade; the C-grade (LT1920CS8#PBF) is characterized to meet these limits but tested at 0°C to 70°C.

Can the LT1920CS8#PBF operate from a single 5V supply?

Yes, the LT1920CS8#PBF supports single-supply operation down to +2.3V (with V– = 0V). For 5V operation, tie the REF pin to 0.5V–1.5V (not ground) to ensure output swing remains within valid range; the datasheet barometer example uses REF = V– with inputs biased ≥2.5V above ground. Output swing is typically –0.2V to 4.3V at 5V supply with RL = 10kΩ, as specified in the Electrical Characteristics table under VOUT conditions.

What external components are required for basic operation of the LT1920CS8#PBF?

Only three external components are required for basic operation: one gain-set resistor RG (calculated as RG = 49.4kΩ/(G–1)), and two 0.1µF ceramic bypass capacitors - one from +VS to ground and one from –VS to ground. No external offset trim is needed due to laser trimming; the REF pin may be tied directly to ground or a reference voltage depending on output swing requirements.

Does the LT1920CS8#PBF meet IEC 61000-4-2 Level 4 ESD requirements?

Yes, the LT1920CS8#PBF meets IEC 61000-4-2 Level 4 (8kV contact, 15kV air) when used with two external 5kΩ resistors in series with each input (as shown in Figure 4 of the datasheet). This configuration is explicitly validated in the Absolute Maximum Ratings and Applications Information sections. Without these resistors, the device supports 13kV HBM per JEDEC JESD22-A114, which exceeds Level 4 for human-body discharge but not system-level contact discharge.