Analog Devices Inc. LT1469CN8#PBF

Overview

LT1469CN8#PBF 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, and 900 ns settling to 150 µV for 10 V steps - enabling high-fidelity DAC current-to-voltage conversion and ADC buffering in ±5 V or ±15 V supplies.

For engineers reviewing the LT1469CN8#PBF datasheet, LT1469CN8#PBF pinout, LT1469CN8#PBF application, or LT1469CN8#PBF equivalent, this device is selected when simultaneous DC accuracy (≤125 µV V_OS, ≤3 µV/°C drift), low distortion (–96.5 dB THD at 100 kHz), and fast settling in inverting configurations are required.

Technical Context

The LT1469CN8#PBF employs a single-stage architecture with bias current cancellation tailored for inverting applications - minimizing errors in DAC I-to-V converters where the inverting input bias current is trimmed to ≤10 nA at zero common-mode voltage. Its input stage includes 100 Ω series resistors and back-to-back diodes for ESD protection and overvoltage robustness.

It achieves unity-gain stability while maintaining 90 MHz GBW and 300 V/mV minimum DC open-loop gain into 2 kΩ loads. The 5 nV/√Hz input voltage noise and 0.6 pA/√Hz current noise are jointly optimized for source impedances between 1 kΩ and 20 kΩ, making it suitable for precision transimpedance and reference inverter topologies.

Key Specifications

Pinout & Package

LT1469CN8#PBF uses an 8-lead PDIP (Plastic Dual In-line Package) with 0.300-inch width, rated for 0°C to 70°C operation. Pin 1 is identified by a notch or beveled corner; exposed pad is absent (unlike DFN variants).

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA211AIDR and ADA4898-2ARMZ, the LT1469CN8#PBF uniquely balances 16-bit settling (900 ns), inverting-input bias trim (≤10 nA), and 90 MHz GBW - making it irreplaceable in DAC I-to-V and ADC buffer roles where simultaneous DC precision and AC fidelity are non-negotiable.

Availability

LT1469CN8#PBF is available at Aetrix Electronics and suitable for high-accuracy data acquisition systems, 16-bit DAC interface circuits, and low-distortion active filter designs requiring stable component supply across industrial temperature ranges.

Supply support for LT1469CN8#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.

The LT1469CN8#PBF belongs to Linear Technology's precision op amp product line, engineered specifically for applications demanding simultaneous high DC accuracy, fast settling, and low distortion - such as 16-bit DAC interfaces and metrology-grade data acquisition.

FAQ

What is the maximum input offset voltage specification for LT1469CN8#PBF at ±15 V supply?

The maximum input offset voltage for LT1469CN8#PBF is 125 µV at ±15 V supply and 25°C, as specified in the Electrical Characteristics table for N8/S8 packages. This value applies over the 0°C to 70°C operating temperature range, with typical drift of ≤3 µV/°C ensuring long-term stability in precision instrumentation.

Can LT1469CN8#PBF drive a 100 pF capacitive load in unity-gain configuration?

Yes, LT1469CN8#PBF is characterized to drive up to 100 pF in unity-gain configuration without oscillation or excessive peaking. For loads exceeding 100 pF, a small series resistor (e.g., 10–50 Ω) should be added between output and load, and a feedback capacitor may be required per Figure 3 in the datasheet to maintain stability.

How does the inverting input bias current trimming benefit LT1469CN8#PBF in DAC I-to-V applications?

The inverting input bias current of LT1469CN8#PBF is trimmed to ≤10 nA at zero common-mode voltage, directly reducing offset error in DAC current-to-voltage conversion. This eliminates the need for external bias current compensation networks and preserves 16-bit accuracy without calibration - a key differentiator versus untrimmed op amps like OPA211AIDR.

What is the guaranteed settling time specification for LT1469CN8#PBF under 16-bit conditions?

LT1469CN8#PBF guarantees 900 ns settling time to 150 µV (equivalent to 0.0023% of a 10 V step) under AV = –1, ±15 V supply, and 25°C. This meets the 16-bit settling requirement (150 µV = 1 LSB of ±10 V full-scale range) and was validated using AN74 measurement methodology for DAC I-to-V converter evaluation.

Does LT1469CN8#PBF require external compensation for unity-gain stability?

No, LT1469CN8#PBF is internally compensated for unity-gain stability. No external compensation components are needed for gains ≥1, simplifying PCB layout for ADC buffer and reference inverter applications. However, for gains <1 (e.g., attenuators), stability analysis per the datasheet's gain vs frequency plots is recommended.