Analog Devices Inc. LT1469ACDF#TRPBF

Overview

LT1469ACDF#TRPBF from Analog Devices (acquired Linear Technology) is a dual precision high-speed operational amplifier optimized for 16-bit data acquisition systems. It delivers 90 MHz gain bandwidth, 22 V/µs slew rate, 900 ns settling to 150 µV (10 V step, AV = –1), ±12.8 V output swing into 2 kΩ, and 5 nV/√Hz input voltage noise - enabling high-fidelity DAC current-to-voltage conversion and ADC buffering in ±5 V or ±15 V systems.

For engineers reviewing the LT1469ACDF#TRPBF datasheet, LT1469ACDF#TRPBF pinout, LT1469ACDF#TRPBF application, or LT1469ACDF#TRPBF equivalent, key selection criteria include guaranteed 125 µV max input offset voltage (±15 V), 3 µV/°C max drift, 16-bit settling performance, DFN-12 package thermal characteristics (θJA = 43°C/W), and validated operation in inverting configurations with bipolar output swing.

Technical Context

The LT1469ACDF#TRPBF employs a single-stage architecture with bias current cancellation tailored for inverting applications, where inverting input bias current is trimmed to ≤10 nA at 25°C and drift-controlled for DAC I-to-V accuracy. Its open-loop gain exceeds 300 V/mV into 2 kΩ, supporting low distortion (<–96.5 dB THD at 100 kHz) even at full-scale 10 V_P-P output.

Designed for stability with unity-gain configuration, it achieves 90 MHz GBW and 350 kHz full-power bandwidth (10 V peak), while maintaining 96 dB CMRR and 112 dB PSRR at ±15 V supplies - critical for rejecting supply- and common-mode-induced errors in precision signal chains.

Key Specifications

Pinout & Package

LT1469ACDF#TRPBF is housed in a 12-lead (4 mm × 4 mm) plastic DFN package with exposed thermal pad (Pin 13) requiring connection to V– for thermal and electrical integrity. The leadless design offers low inductance and improved high-frequency performance versus SO-8 or PDIP variants.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision high-speed op amp applications.

Compared with ADA4898-1ARMZ and OPA2189IDR, the LT1469ACDF#TRPBF uniquely balances 16-bit settling time, trimmed inverting bias current, and 90 MHz GBW - making it the only option among the three qualified for simultaneous high-accuracy and high-bandwidth signal conditioning in production data acquisition modules.

Availability

LT1469ACDF#TRPBF is available at Aetrix Electronics and suitable for high-accuracy data acquisition systems, precision DAC interface modules, and medical instrumentation requiring stable component supply with guaranteed 0°C to 70°C operation and RoHS-compliant packaging.

Supply support for LT1469ACDF#TRPBF 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) acquired Linear Technology in 2017 and maintains its precision analog portfolio with rigorous characterization and long-term product consistency.

The LT1469ACDF#TRPBF belongs to Linear Technology's precision high-speed op amp family, engineered specifically for 16-bit data converter interfaces where simultaneous DC accuracy, AC linearity, and fast settling are non-negotiable.

FAQ

What is the maximum input offset voltage specification for LT1469ACDF#TRPBF at ±15 V supply?

The LT1469ACDF#TRPBF has a maximum input offset voltage of 125 µV at ±15 V supply and 25°C, as specified in the Electrical Characteristics table for the A-grade DF package. This value is guaranteed over the 0°C to 70°C operating temperature range and ensures compatibility with 16-bit systems requiring ≤±1 LSB error at ±10 V full scale.

Does LT1469ACDF#TRPBF require external compensation for unity-gain stability?

No, the LT1469ACDF#TRPBF is internally compensated and unity-gain stable. It does not require external compensation capacitors in gain-of-1 configurations such as ADC buffers. However, for inverting configurations with feedback resistors >2 kΩ, a feedback capacitor (CF > RG • CIN/RF) is recommended to cancel input pole peaking and maintain phase margin.

How is the exposed thermal pad (Pin 13) of LT1469ACDF#TRPBF intended to be connected?

The exposed pad (Pin 13) of the LT1469ACDF#TRPBF must be soldered directly to the V– power plane on the PCB. This connection is mandatory for both thermal dissipation (reducing θJA from 190°C/W to 43°C/W) and electrical stability. Floating or grounding the pad to a separate net violates the Absolute Maximum Ratings and degrades AC performance.

Can LT1469ACDF#TRPBF drive capacitive loads, and what is the limit?

Yes, the LT1469ACDF#TRPBF can drive up to 100 pF in unity-gain and 300 pF in inverting gain-of–1 configurations. For larger loads, a series resistor (RO ≥ (1 + RF/RG)/(2 • CL • 5 MHz)) must be added between output and load, along with a feedback capacitor (CF = (2RO/RF)CL) from output to inverting input, per Figure 3 in the datasheet.

What is the guaranteed settling time specification for LT1469ACDF#TRPBF in a gain-of–1 configuration?

The LT1469ACDF#TRPBF is guaranteed to settle to 150 µV (0.0015% of 10 V step) in 900 ns under AV = –1, ±15 V supply, and RL = 2 kΩ conditions. This 16-bit settling time is validated across the 0°C to 70°C temperature range and forms the basis for its use in high-speed DAC I-to-V converter designs.