Analog Devices Inc. LT1722CS8#PBF

Overview

LT1722CS8#PBF from Analog Devices (formerly Linear Technology) is a single-channel, low-noise, high-speed precision operational amplifier in an 8-lead SOIC package. It delivers 200MHz gain bandwidth, 70V/μs slew rate, 3.8nV/√Hz input voltage noise, ±3.4V output swing into 150Ω with ±5V supplies, and unity-gain stability up to 100pF capacitive load - enabling high-fidelity video line driving and wideband signal conditioning.

For engineers reviewing the LT1722CS8#PBF datasheet, LT1722CS8#PBF pinout, LT1722CS8#PBF application, or LT1722CS8#PBF equivalent, key selection criteria include its specified 0°C to 70°C operating range, SO-8 thermal resistance (θ_JA = 150°C/W), low 3.7mA supply current per amplifier, and compatibility with single 5V or dual ±5V supplies in high-speed analog front-ends.

Technical Context

The LT1722CS8#PBF employs a voltage-feedback architecture built on Linear's advanced low-voltage complementary bipolar process. Its folded-cascode first stage with degeneration resistor and bootstrapped current mirror enables simultaneous high DC gain (>10 V/mV), low input offset voltage (≤400 μV), and low input bias current (≤300 nA).

It features internal input protection diodes limiting differential input voltage to ±0.7V and ESD clamps to both rails. The output stage uses complementary emitter followers capable of sourcing/sinking ≥23mA while maintaining 0.15Ω output impedance at 1MHz - critical for driving 75Ω video lines or 150Ω twisted-pair CAT-5 loads.

Key Specifications

Pinout & Package

LT1722CS8#PBF is housed in an 8-lead plastic SOIC (Small Outline Integrated Circuit) package, 3.9mm wide, with standard 1.27mm lead pitch and JEDEC MS-012AC footprint. Thermal resistance θ_JA = 150°C/W enables operation at full spec under natural convection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA2350UA and AD8055ARZ, the LT1722CS8#PBF uniquely balances 200MHz bandwidth, 3.7mA supply current, and ±5V dual-supply operation - making it optimal for cost-sensitive, high-performance video and communications infrastructure where thermal headroom and layout simplicity are critical.

Availability

LT1722CS8#PBF is available at Aetrix Electronics and suitable for video line drivers, active filters, data acquisition front-ends, RF signal conditioning, and precision instrumentation requiring stable component supply across industrial and broadcast design cycles.

Supply support for LT1722CS8#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 and maintains its high-performance analog IC portfolio. Linear Technology was renowned for precision, speed, and power efficiency in signal conditioning components.

The LT1722CS8#PBF belongs to Linear's LT172x family of high-speed precision op amps, designed specifically for demanding video, communications, and test equipment applications where low noise, high bandwidth, and DC accuracy must coexist.

FAQ

What is the maximum capacitive load the LT1722CS8#PBF can drive while remaining unity-gain stable?

The LT1722CS8#PBF is unity-gain stable with capacitive loads up to 100pF. Beyond this value, peaking and overshoot occur in transient response. For larger loads, a 25Ω series resistor in the output path restores stability regardless of capacitance magnitude - a technique validated in the LT1722CS8#PBF datasheet Figure 17.

Does the LT1722CS8#PBF support single 5V supply operation, and what is its output swing under that condition?

Yes, the LT1722CS8#PBF is fully specified for single 5V operation. With a 500Ω load referenced to 2.5V, the output swings from 1.5V to 3.5V - delivering 2V_PP linear range ideal for interfacing with SAR ADCs and digital logic families requiring mid-supply reference points.

What is the input voltage range specification for the LT1722CS8#PBF when operated on ±5V supplies?

When powered from ±5V supplies, the LT1722CS8#PBF has an input voltage range of –4V to +4V for both inputs. This rail-to-rail input capability allows direct connection to signals spanning nearly the full supply range without attenuation or level-shifting circuitry.

How does the LT1722CS8#PBF achieve low input bias current despite using bipolar input transistors?

The LT1722CS8#PBF uses an input bias current cancellation technique where opposing transistor pairs generate compensating currents. This reduces net input bias current to ≤300nA while retaining the speed and noise advantages of bipolar technology - eliminating the need for matched source resistances typically required with JFET or CMOS op amps.

Is the LT1722CS8#PBF pin-compatible with other op amps in the LT172x family, such as the LT1723 or LT1724?

No, the LT1722CS8#PBF is not pin-compatible with the LT1723 (dual) or LT1724 (quad). While all share the SO-8 package option, the LT1722CS8#PBF has dedicated NC pins (1,4,5) and a unique pinout: V+, OUT, NC, NC, NC, –IN, +IN, V–. The LT1723SO-8 places both amplifiers' inputs and outputs on shared pins, making direct substitution impossible without PCB redesign.