SBOS401C July 2007 – April 2016 INA270A-Q1 , INA271A-Q1
PRODUCTION DATA.
- 1 Features
- 2 Applications
- 3 Description
- 4 Revision History
- 5 Device Comparison Table
- 6 Pin Configuration and Functions
- 7 Specifications
- 8 Detailed Description
- 9 Application and Implementation
- 10Power Supply Recommendations
- 11Layout
- 12Device and Documentation Support
- 13Mechanical, Packaging, and Orderable Information
8 Detailed Description
8.1 Overview
The INA27xA-Q1 is a family of voltage output current-sense amplifiers. INA27xA-Q1 operates over a wide common-mode voltage range (–16 V to +80 V). The package brings out the output of the pre amplifier stage (PRE OUT) and the input to the output buffer stage (BUF IN). This pinout readily enables filtering, see First- or Second-Order Filtering.
8.2 Functional Block Diagram
8.3 Feature Description
8.3.1 Output Voltage Range
The output of the INA27xA-Q1 is accurate within the output voltage swing range set by the power-supply pin, VS.
8.4 Device Functional Modes
8.4.1 First- or Second-Order Filtering
The INA27xA-Q1 devices readily enable the inclusion of filtering between the preamp output and buffer input. Single-pole filtering can be accomplished with a single capacitor because of the 96-kΩ output impedance at PRE OUT on pin 3 (see Figure 15a).
The INA27xA-Q1 devices readily lend themselves to second-order Sallen-Key configurations (see Figure 15b). When designing these configurations consider that the PRE OUT 96-kΩ output impedance exhibits an initial variation of ±30% with the addition of a –2200-ppm/°C temperature coefficient.
