ADM660ARZ-REEL

Overview

The ADM660ARZ-REEL is a CMOS switch-capacitor voltage converter manufactured by Analog Devices Inc., housed in an 8-SOIC surface-mount package. It operates on input voltages ranging from 1.5 V to 7 V and delivers up to 100 mA of output current. The device supports two primary configurations: voltage inversion (VOUT = -VIN) and voltage doubling (VOUT = 2 x VIN). It features selectable charge pump frequencies of 25 kHz or 120 kHz, allowing designers to optimize the trade-off between external capacitor size and quiescent current consumption.

Feature Summary

• CMOS switch-capacitor topology eliminates the need for inductors, reducing electromagnetic interference and component count.
• Configurable operation modes enable generation of negative supply rails or doubled positive voltages from a single source.
• Selectable switching frequency allows optimization of external capacitance requirements versus static power consumption.

Applications

• Generating negative supply rails for operational amplifiers and comparators in single-supply systems
• Providing boosted voltage outputs for sensors requiring higher drive levels than the main supply provides
• Portable instrumentation and data acquisition systems requiring efficient voltage conversion without magnetic components

Procurement Notes

Verify that the specific suffix 'REEL' corresponds to the tape-and-reel packaging format required for automated assembly processes. Confirm the exact part number against the manufacturer's official documentation to ensure compatibility with design specifications. Check for any regional distribution restrictions or limited availability status associated with this specific reel configuration before finalizing procurement plans.

Selection Notes

Select this component when inductor-free voltage inversion or doubling is required within a 1.5 V to 7 V input range. Consider the 25 kHz/120 kHz frequency selection based on available board space for capacitors and acceptable quiescent current limits. Ensure the 100 mA output capability meets the load requirements, noting that efficiency decreases at maximum current loads compared to lower current operations.

Part Context

This device belongs to the ADM660 series of charge pump voltage converters from Analog Devices. It serves as a pin-compatible upgrade alternative to legacy devices such as the MAX660, MAX665, and ICL7660, facilitating direct replacement in existing designs while offering improved CMOS performance characteristics and flexible frequency control options.

Replacement Considerations

The ADM660ARZ-REEL is documented as a pin-compatible replacement for the MAX660, MAX665, and ICL7660. Verify pinout alignment and electrical parameter compatibility when substituting these legacy parts to ensure seamless integration into existing circuit layouts.

FAQ

How is the switching frequency selected?

The switching frequency is selected using the FC (Frequency Control) input pin, which allows the user to choose between 25 kHz and 120 kHz operation.

What is the relationship between frequency selection and external components?

Selecting 25 kHz typically requires larger external capacitors (e.g., 10 µF), while selecting 120 kHz allows for smaller capacitors (e.g., 2.2 µF).