Analog Devices Inc. LT6600IS8-5#PBF

Overview

LT6600IS8-5#PBF from Analog Devices (acquired Linear Technology) is a fully differential amplifier with integrated 4th-order 5MHz Chebyshev lowpass filter, programmable gain via two external resistors, 82dB SNR at 3V/2VP-P, and adjustable output common mode voltage. It serves as an anti-aliasing driver for high-speed ADCs in base station receivers and test equipment.

For engineers reviewing the LT6600IS8-5#PBF datasheet, LT6600IS8-5#PBF pinout, LT6600IS8-5#PBF application, or LT6600IS8-5#PBF equivalent, key selection criteria include its 5MHz cutoff with 0.5dB passband ripple, differential input/output architecture, 3V/5V/±5V supply compatibility, and SO-8 package thermal performance under 800Ω load.

Technical Context

The LT6600IS8-5#PBF integrates a proprietary differential amplifier stage and a 4th-order lowpass filter using internal precision resistor networks to fix 5MHz cutoff and 0.5dB Chebyshev ripple-no external capacitors required. Its dual-stage architecture independently controls first-stage common mode via VMID (Pin 7) and second-stage common mode via VOCM (Pin 2).

It supports single-ended or differential inputs via external RIN resistors (gain = 806Ω/RIN), delivers 2VP-P differential output swing at 3V supply, and maintains 93dBc/96dBc 2nd/3rd harmonic distortion at 1MHz with 800Ω load-enabling direct interface to 12-bit+ ADCs without additional buffering.

Key Specifications

Pinout & Package

LT6600IS8-5#PBF uses an 8-lead plastic SOIC (SO-8, narrow 0.150") package with exposed V– (Pin 6) fused to lead frame for enhanced thermal conduction. θJA = 100°C/W on standard FR-4; reduced to 85°C/W with 330mm² copper on top/bottom layers.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar differential amplifier and lowpass filter applications.

Compared with LT6600CS8-5#PBF, the LT6600IS8-5#PBF guarantees full performance over –40°C to +85°C, making it suitable for outdoor infrastructure; versus ADA4940-1ARZ, it trades bandwidth flexibility for guaranteed 5MHz anti-aliasing with zero external passive components.

Availability

LT6600IS8-5#PBF is available at Aetrix Electronics and suitable for cellular infrastructure, medical imaging, and industrial data acquisition requiring stable component supply with guaranteed extended temperature performance.

Supply support for LT6600IS8-5#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 LT6600 family was designed by Linear Technology specifically for high-fidelity signal conditioning in communications and instrumentation-integrating precision filtering and differential drive to simplify anti-aliasing front-ends.

FAQ

What is the maximum differential input voltage supported by the LT6600IS8-5#PBF?

The LT6600IS8-5#PBF begins limiting differential output voltage above 2VP-P and exhibits noticeable compression above 3.5VP-P, independent of supply voltage. This internal protection prevents excessive power dissipation and provides short-circuit robustness. For linear operation, keep differential input signals ≤2VP-P when configured for unity gain; higher gains proportionally reduce allowable input swing per the gain-setting resistors used with the LT6600IS8-5#PBF.

Can the LT6600IS8-5#PBF operate from a single 3.3V supply?

Yes, the LT6600IS8-5#PBF is fully specified for 3V operation-including 82dB SNR, 2VP-P output swing, and 93dBc distortion at 1MHz-and functions identically at 3.3V. Pin 7 (VMID) must be bypassed to V– with a 0.01μF capacitor, and VOCM (Pin 2) can be tied to VMID to set output common mode to mid-supply (1.65V), matching typical 3.3V ADC references. All electrical characteristics in the LT6600IS8-5#PBF datasheet apply down to 3V.

How is gain programmed on the LT6600IS8-5#PBF?

Gain is set differentially using two identical external resistors (RIN) connected from IN+ (Pin 1) and IN– (Pin 8) to signal sources. The differential gain equals 806Ω divided by RIN (e.g., RIN = 403Ω yields 2× gain). This ratio-based method eliminates dependence on absolute resistor tolerance, and the LT6600IS8-5#PBF's internal 780ppm/°C resistor tempco ensures stable gain across temperature-critical for calibrated systems using the LT6600IS8-5#PBF.

What is the purpose of the VMID (Pin 7) and VOCM (Pin 2) pins on the LT6600IS8-5#PBF?

VMID (Pin 7) sets the common mode voltage of the first amplifier stage and must be bypassed to V– with 0.01μF in single-supply use. VOCM (Pin 2) sets the final differential output common mode voltage and can be tied to VMID for simplicity or driven externally to match ADC reference levels (e.g., 1.25V for SAR ADCs). Both pins enable precise level-shifting-essential when interfacing the LT6600IS8-5#PBF to ADCs with non-mid-supply input ranges.

Does the LT6600IS8-5#PBF require external filter components to achieve its 5MHz cutoff?

No, the LT6600IS8-5#PBF integrates a 4th-order Chebyshev lowpass filter with a fixed 5MHz cutoff and 0.5dB passband ripple using internal precision components-no external capacitors or inductors are needed. This eliminates component count, board space, and tuning effort compared to discrete filter solutions, while guaranteeing phase and amplitude response consistency across production units and temperature for the LT6600IS8-5#PBF.