MCP6S21-I/MS

Instrumentation, Op Amps, Buffer Amps Overview

The MCP6S21-I/MS is a single-channel analog Programmable Gain Amplifier (PGA) from Microchip Technology, housed in an 8-lead MSOP package. It supports gains from +1 V/V to +32 V/V via SPI control. Key electrical parameters include a maximum input offset voltage of ±275 µV, a typical quiescent current of 1.0 mA, and a bandwidth ranging from 2 MHz to 12 MHz depending on gain. The device operates on a single supply between 2.5 V and 5.5 V with rail-to-rail input and output capabilities.

Instrumentation, Op Amps, Buffer Amps Feature Summary

• Configurable gain settings selectable from +1 V/V to +32 V/V through a Serial Peripheral Interface (SPI).
• Rail-to-rail input and output operation enabling full dynamic range utilization within the supply voltage limits.
• Integrated shutdown mode accessible via the serial interface to minimize power consumption during idle periods.

Instrumentation, Op Amps, Buffer Amps Applications

• A/D Converter Driver
• Multiplexed Analog Applications
• Data Acquisition Systems
• Industrial Instrumentation
• Medical Instrumentation

Instrumentation, Op Amps, Buffer Amps Procurement Notes

Verify the specific suffix 'I/MS' corresponds to the industrial temperature range (-40°C to +85°C) and the 8-lead MSOP package configuration. Confirm that the ordering code matches the exact pinout and thermal characteristics required for your PCB layout. Ensure compatibility with the system's SPI logic levels and voltage domain before finalizing procurement.

Instrumentation, Op Amps, Buffer Amps Selection Notes

Select this component when a single-ended signal path with programmable amplification is required. The low input bias current and low offset voltage make it suitable for precision applications. Consider the MSOP package size constraints and verify that the 1.0 mA typical supply current fits the system's power budget compared to lower-power alternatives.

Instrumentation, Op Amps, Buffer Amps Part Context

This part belongs to the MCP6S21/2/6/8 family of analog PGAs. While other variants offer multiple channels or different packages, the MCP6S21 specifically provides a single channel. It shares core architectural features such as the internal resistor ladder and SPI logic with the broader family but is distinct in its I/O count and physical footprint.

Instrumentation, Op Amps, Buffer Amps Replacement Considerations

Direct substitutes within the same family include MCP6S21T-I/MS for tape-and-reel packaging or MCP6S21-I/SN for SOIC-8 packaging. Cross-family replacements require careful evaluation of pin compatibility and electrical parameter alignment.

Instrumentation, Op Amps, Buffer Amps FAQ

How does the MCP6S21 handle unused inputs?

Unused analog inputs should be floated to maintain the lowest input bias current. Alternatively, they can be tied to VSS or VDD, though this may increase input current.

What is the function of the VREF pin?

The VREF pin allows shifting the output voltage level. It must be connected to a low-impedance source between VSS and VDD to adjust the output baseline.