Analog Devices Inc. LT1996ACDD#PBF

Overview

LT1996ACDD#PBF from Analog Devices (formerly Linear Technology) is a precision, gain-selectable difference amplifier IC integrating eight matched SiChrome resistors and a low-offset op amp in a single 10-lead DFN package. It delivers gain accuracy of ±0.05% at G = 81, CMRR >100 dB, rail-to-rail output swing within 40 mV of rails, and operates from 2.7 V single or ±18 V split supplies - ideal for high-accuracy differential sensing in medical instrumentation and strain gauge interfaces.

For engineers reviewing the LT1996ACDD#PBF datasheet, LT1996ACDD#PBF pinout, LT1996ACDD#PBF application, or LT1996ACDD#PBF equivalent, key selection criteria include verified resistor matching (±0.02% typ), guaranteed CMRR ≥80 dB across temperature, input voltage range up to ±60 V on P9/M9 pins, and confirmed operation in difference, inverting, and noninverting configurations without external components.

Technical Context

The LT1996ACDD#PBF implements a fully integrated difference amplifier architecture with internal 450 kΩ/9, 450 kΩ/27, 450 kΩ/81, and 450 kΩ precision-matched resistors connected to dedicated P/M input terminals. Its op amp core features 15 µV typical offset voltage, 3 nA input bias current, and 560 kHz gain-bandwidth product - enabling stable operation into 500 pF capacitive loads at noise gains ≥2.

Gain configuration is achieved by selectively grounding, floating, or connecting P/M pins (e.g., P9/M9 for G = 9, P27/M27 for G = 27, P81/M81 for G = 81), with REF pin setting output common-mode level. Resistor matching drift is <3 ppm/°C, and absolute resistor tolerance is ±30%, but matching guarantees ≤0.05% gain error over –40°C to 85°C.

Key Specifications

Pinout & Package

LT1996ACDD#PBF is housed in a 10-lead (3 mm × 3 mm) plastic DFN package with underside metal pad connected to VEE (optional PCB connection). Thermal resistance θ_JA = 160°C/W; max junction temperature = 125°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LT1996ACDD#PBF, LT1991IMS#PBF offers fewer gain options and lower CMRR but shares the same pin-configuration philosophy, while AD8271ARMZ trades configurability for lower cost and fixed performance - making LT1996ACDD#PBF uniquely suited for multi-gain, high-precision, low-power differential sensing.

Availability

LT1996ACDD#PBF is available at Aetrix Electronics and suitable for medical instrumentation, strain gauge amplifiers, and handheld instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across –40°C to 85°C.

Supply support for LT1996ACDD#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.

The LT1996ACDD#PBF belongs to Linear's precision amplifier family, designed specifically for applications demanding ultra-stable gain, exceptional resistor matching, and flexible topology configuration without external components.

FAQ

What is the maximum input voltage the LT1996ACDD#PBF can tolerate on its P9 and M9 pins?

The LT1996ACDD#PBF supports ±60 V input voltage on P9 and M9 pins when P81/M81 are grounded and supply is ±15 V - a feature enabled by substrate-isolated 50 kΩ resistors. This exceeds standard op amp input ratings and allows direct interface with high-common-mode industrial sensors without external attenuation or protection circuitry. Always verify that input current remains below 10 mA per pin to avoid damage.

Does the LT1996ACDD#PBF require external resistors to achieve gain settings?

No, the LT1996ACDD#PBF does not require external resistors for any of its supported gain configurations. All gain settings - including difference amplifier gains of 9, 27, and 81, and noninverting gains from 0.008 to 118 - are achieved solely by grounding, floating, or interconnecting its dedicated P and M input pins (P9/M9, P27/M27, P81/M81) and REF pin. This eliminates external component variation and improves long-term stability.

What is the guaranteed common-mode rejection ratio (CMRR) for LT1996ACDD#PBF over temperature?

The LT1996ACDD#PBF guarantees CMRR ≥80 dB over the full –40°C to 85°C operating temperature range at G = 9 and VS = ±15 V. At G = 27, CMRR is ≥90 dB min; at G = 81, it is ≥100 dB min. These values are measured referred to inputs (RTI) and reflect the benefit of internal resistor matching drift <3 ppm/°C - critical for maintaining accuracy in thermally varying environments.

Can the LT1996ACDD#PBF operate from a single 3.3 V supply?

Yes, the LT1996ACDD#PBF operates from a single 3.3 V supply (VCC = 3.3 V, VEE = 0 V), with specified performance including rail-to-rail output swing (within 65 mV of rails at no load), input common-mode range of 0.98 V to 1.86 V on P9/M9 when VREF = 1.25 V, and 100 µA supply current. Full functionality is maintained, though gain error and CMRR are characterized at 5 V and ±15 V - actual performance at 3.3 V meets or exceeds datasheet minima.

How does the LT1996ACDD#PBF achieve 0.05% gain accuracy without laser trimming?

The LT1996ACDD#PBF achieves ≤0.05% gain error through monolithic integration of eight precision-matched SiChrome resistors (matching ±0.02% typ) and a low-drift op amp on a single die. Resistor matching - not absolute tolerance - determines gain accuracy, and the matching is guaranteed by process control and validated via gain error testing rather than post-package trimming. This eliminates trim pads, reduces die size, and improves long-term stability versus trimmed discrete solutions.