Analog Devices Inc. LT6600IS8-2.5#PBF

Overview

LT6600IS8-2.5#PBF from Analog Devices (formerly Linear Technology) is a fully differential amplifier with integrated 4th-order Chebyshev 2.5MHz lowpass antialiasing filter, programmable gain via two external resistors, adjustable output common-mode voltage, and specified operation from –40°C to 85°C in SO-8 package. It delivers 86dB SNR at 3V supply with 1VRMS output and supports 5.1VP-P differential swing on 3V.

For engineers reviewing the LT6600IS8-2.5#PBF datasheet, LT6600IS8-2.5#PBF pinout, LT6600IS8-2.5#PBF application, or LT6600IS8-2.5#PBF equivalent, key selection criteria include passband ripple (±0.6dB max), input-referred noise (51μVRMS, 10kHz–2.5MHz), distortion (95dBc 2nd harmonic @1MHz), differential I/O compatibility, and VOCM/VMID biasing flexibility for ADC driver and DAC smoothing use cases.

Technical Context

The LT6600IS8-2.5#PBF integrates a proprietary low-noise differential amplifier stage followed by a matched 4th-order lowpass filter with internally set 2.5MHz cutoff and ±0.6dB passband ripple. Its architecture eliminates need for external precision components to define bandwidth or filter response.

It features dual independent common-mode control: VMID sets 1st-stage output common mode (internally biased at mid-supply, 5.5kΩ impedance), while VOCM programs final differential output common mode (high-impedance input, ≤1V below VMID). Gain is set by external RIN resistors (e.g., 1580Ω for unity gain), with differential gain = 1580Ω/RIN.

Key Specifications

Pinout & Package

LT6600IS8-2.5#PBF is housed in an 8-lead plastic SO (SO-8) package with exposed lead frame for thermal enhancement. Pin 6 is fused to the lead frame and must be connected to ground plane for optimal θJA (100°C/W typical).

Key Features

Applications

Equivalent & Alternatives

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

Compared with LT6600CS8-2.5#PBF, the LT6600IS8-2.5#PBF guarantees full spec compliance over –40°C to 85°C, making it suitable for industrial and outdoor deployments; compared with LT6600IDF-2.5#PBF, it offers proven SO-8 manufacturability and thermal design simplicity at the cost of slightly higher θJA.

Availability

LT6600IS8-2.5#PBF is available at Aetrix Electronics and suitable for high-speed ADC driver, DAC output smoothing, medical imaging front-end, and test & measurement signal conditioning applications requiring stable component supply across industrial temperature ranges.

Supply support for LT6600IS8-2.5#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 technologies, serving industrial, communications, automotive, and healthcare markets.

The LT6600 family was designed by ADI's former Linear Technology division specifically for high-fidelity signal chain applications requiring integrated antialiasing filtering and differential amplification - targeting precision data acquisition, communications infrastructure, and medical instrumentation.

FAQ

What is the maximum differential input voltage the LT6600IS8-2.5#PBF can handle without damage?

The LT6600IS8-2.5#PBF has absolute maximum differential input voltage of ±1.4V due to internal back-to-back diode protection. Exceeding this risks >10mA input current, which may cause permanent damage. For robust operation, keep differential input ≤2VP-P within linear range and ensure external current limiting if transient overvoltage is possible. The LT6600IS8-2.5#PBF is rated for 9VP-P differential output swing but input clamping occurs well before that limit.

Can the LT6600IS8-2.5#PBF operate from a single 3.3V supply?

Yes, the LT6600IS8-2.5#PBF is fully specified for single 3V and 3.3V operation. At 3.3V, it delivers 5.1VP-P differential output swing, 86dB SNR at 1VRMS output, and maintains ±0.6dB passband ripple up to 2.5MHz. VMID internally biases to ~1.65V, and VOCM should be set ≤1.65V for low-distortion operation. The LT6600IS8-2.5#PBF draws 26–33mA depending on signal level and load.

How do I set the differential gain of the LT6600IS8-2.5#PBF to 4V/V?

To achieve 4V/V differential gain with the LT6600IS8-2.5#PBF, connect two identical 402Ω resistors (RIN) from IN+ and IN– to the signal source. The gain formula is 1580Ω / RIN, so 1580 / 402 ≈ 3.93 → rounded to 4V/V. Use 1% metal-film resistors for best matching. This configuration yields 11.3–11.8dB gain (typ), 18μVRMS input-referred noise (10kHz–2.5MHz), and maintains full 2.5MHz filter response per the LT6600IS8-2.5#PBF datasheet.

Does the LT6600IS8-2.5#PBF require external compensation components?

No, the LT6600IS8-2.5#PBF requires no external compensation components. Its 4th-order 2.5MHz lowpass filter and differential amplifier are fully internal and factory-trimmed. Only two external RIN resistors set gain, and bypass capacitors (0.1μF on V+/V–, 0.01μF on VOCM/VMID) are mandatory for stability and noise suppression. No feedback capacitors, snubbers, or RC networks are needed - the LT6600IS8-2.5#PBF is a complete, self-contained filter-amplifier solution.

What is the purpose of the VMID pin on the LT6600IS8-2.5#PBF?

The VMID pin (Pin 7 in SO-8) on the LT6600IS8-2.5#PBF provides the internal mid-supply bias voltage (~VS/2) for the first differential amplifier stage. It sets the common-mode voltage of that stage's output and must be bypassed to V– with a 0.01μF ceramic capacitor. While VMID can be overridden with an external low-impedance source, doing so affects distortion and noise; the LT6600IS8-2.5#PBF is optimized for VMID = VS/2, and deviation requires careful validation per the datasheet's Table 1.