Analog Devices Inc. DC1796A-F

Overview

LTC6360 from Analog Devices (acquired Linear Technology) is a very low noise, high-speed, single-ended SAR ADC driver amplifier with true zero-output capability on a single 5V supply. It delivers 2.3nV/√Hz input voltage noise density, 110dB SNR over 3MHz bandwidth, and 150ns settling time to 16-bit accuracy for 4V steps - enabling precision signal conditioning in high-resolution data acquisition systems.

For engineers reviewing the LTC6360 datasheet, LTC6360 pinout, LTC6360 application, or LTC6360 equivalent, key selection considerations include its integrated charge pump enabling true 0V output swing, harmonic distortion performance (HD2 = –103dBc / HD3 = –109dBc at 40kHz), low offset voltage (250µV max), and dual-package availability (8-pin DFN and MSOP) across –40°C to 125°C operation.

Technical Context

The LTC6360 employs a single high-precision amplifier core with an on-chip low-noise charge pump generating –0.6V at CPO to bias the output stage, enabling rail-to-true-zero swing without external negative supplies. Its NPN/PNP parallel input stage maintains constant transconductance and <3.5µA total input bias current variation across 0V–4.25V common-mode range.

It features decompensated unity-gain-stable design optimized for RC-filtered ADC interface (e.g., 10Ω + 330pF), delivering 250MHz closed-loop –3dB bandwidth and 2.7MHz full-power bandwidth limited by charge pump sink capability - not slew rate alone. Gain-bandwidth product is 1GHz, supporting high-fidelity signal integrity up to 18-bit SAR conversion.

Key Specifications

Pinout & Package

Available in two thermally enhanced packages: 3mm × 3mm 8-pin DFN (DD-8) and 8-pin MSOP with exposed pad (MS8E), both rated for –40°C to 125°C operation. Exposed pad (Pin 9) must be connected to GND for thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ADC driver applications.

Compared with ADA4897-1 and THS4561, the LTC6360 uniquely integrates a low-noise charge pump to achieve true zero output on a single 5V supply - reducing system complexity, EMI, and PCB footprint while maintaining 110dB SNR and –109dBc HD3 at 40kHz for high-fidelity data acquisition.

Availability

LTC6360 is available at Aetrix Electronics and suitable for industrial process monitoring, medical instrumentation, test & measurement equipment, and automotive battery management systems requiring stable component supply with guaranteed long-term manufacturability.

Supply support for LTC6360 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 precision instrumentation, industrial automation, and communications markets.

The LTC6360 belongs to ADI's precision amplifier portfolio designed specifically for high-resolution SAR ADC driving - emphasizing ultra-low noise, fast settling, true zero output, and robust single-supply operation in demanding measurement applications.

FAQ

What is the primary function of the LTC6360 in a signal chain?

The LTC6360 functions as a very low noise, high-speed single-ended SAR ADC driver amplifier. Its core purpose is to condition analog sensor or signal source outputs - providing gain, buffering, and precise voltage translation - before digitization. The LTC6360 achieves true 0V output swing on a single 5V supply using an integrated charge pump, making it ideal for interfacing with unipolar-input ADCs in precision data acquisition systems.

How does the LTC6360 achieve true zero-volt output on a single 5V supply?

The LTC6360 achieves true zero-volt output through an on-chip low-noise charge pump that generates a stable –0.6V bias voltage at the CPO pin. This voltage is routed to the CPI pin to bias the output stage, allowing the OUT pin to swing down to –0.48V (typical) - effectively reaching true 0V with high linearity. This eliminates the need for external negative supplies or level-shifting circuitry, simplifying design and reducing EMI compared to discrete charge pump solutions.

What are the recommended external components for stable operation of the LTC6360?

For stable operation, the LTC6360 requires: (1) 0.1µF + 10µF decoupling capacitors on VCC/VDD close to Pins 3/4; (2) 0.1µF capacitor from CPI (Pin 6) to GND to reduce charge pump ripple; (3) 10Ω series resistor + 330pF capacitor from OUT (Pin 2) to ADC input for filtering and stability. Layout best practices include short traces, removal of ground plane under –IN, and connection of the exposed pad (Pin 9) directly to GND.

Can the LTC6360 drive ADCs with input ranges beyond 0–4V?

Yes - the LTC6360 supports an input common-mode voltage range of 0V to 4.25V and output swing of –0.48V to 4.91V on a 5V supply. When configured in noninverting gain (e.g., AV = 2), it can deliver up to ~8V peak-to-peak output. However, for optimal linearity and distortion performance, operation within the specified 0–4V output range is recommended. The device's 110dB SNR and –109dBc HD3 are characterized at 4VP-P, and exceeding this may degrade harmonic performance.

What is the significance of the SHDN pin on the LTC6360?

The SHDN (shutdown) pin (Pin 7) provides power management capability: pulling it low (<0.8V) places the LTC6360 into shutdown mode, reducing total supply current to ≤350µA. In active mode (SHDN ≥2.0V), the device draws ~17.5mA typical. This feature enables dynamic power scaling in battery-powered or thermally constrained systems. Turn-on and turn-off times are 1µs and 0.3µs respectively, supporting rapid wake/sleep cycles without compromising ADC timing budgets.