INA225 36V Pin Selectable-Gain, Bi-Directional, High-Speed, Voltage Output Current-Sense Amp | TI.com

INA225 (ACTIVE)

36V Pin Selectable-Gain, Bi-Directional, High-Speed, Voltage Output Current-Sense Amp

 

Description

The INA225 is a voltage-output, current-sense amplifier that senses drops across current-sensing resistors at common-mode voltages that can vary from 0 V to 36 V, independent of the supply voltage. The device is a bidirectional, current-shunt monitor that allows an external reference to be used to measure current flowing in both directions across a current-sensing resistor.

Four discrete gain levels are selectable using the two gain-select terminals (GS0 and GS1) to program gains of 25 V/V, 50 V/V, 100 V/V, and 200 V/V. The low-offset, zero-drift architecture and precision gain values enable current-sensing with maximum drops across the shunt as low as 10 mV of full-scale while maintaining very high accuracy measurements over the entire operating temperature range.

The device operates from a single +2.7-V to +36-V power supply, drawing a maximum of 350 µA of supply current. The device is specified over the extended operating temperature range (–40°C to +125°C), and is offered in an MSOP-8 package.

Features

  • Wide Common-Mode Range: 0 V to 36 V
  • Offset Voltage: ±150 µV (Max, All Gains)
  • Offset Voltage Drift: 0.5 µV/°C (Max)
  • Gain Accuracy, Over Temperature (Max):
    • 25 V/V, 50 V/V: ±0.15%
    • 100 V/V: ±0.2%
    • 200 V/V: ±0.3%
    • 10-ppm/°C Gain Drift
  • 250-kHz Bandwidth (Gain = 25 V/V)
  • Programmable Gains:
    • G1 = 25 V/V
    • G2 = 50 V/V
    • G3 = 100 V/V
    • G4 = 200 V/V
  • Quiescent Current: 350 µA (Max)
  • Package: MSOP-8

INA225 Error Analysis

0.001m ≤ 
 mOhm ≤ 100m
0.0001 ≤ 
A
A ≤ 100 
2.7 ≤ 
V ≤ 36
0 ≤ 
V ≤ 36
-40 ≤ 
C ≤ 125

Parametrics

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Part number Order Common mode voltage (Max) (V) Common mode voltage (Min) (V) Input offset (+/-) (Max) (uV) Input offset drift (+/-) (Typ) (uV/C) Gain (V/V) Gain error (%) Gain error drift (+/-) (Max) (ppm/°C) CMRR (Min) (dB) Bandwidth (kHz) Supply voltage (Max) (V) Supply voltage (Min) (V) Iq (Max) (mA) Number of channels (#) Comparators (#) Features Rating Operating temperature range (C) Package Group Package size: mm2:W x L (PKG)
INA225 Order now 36     0     150     0.1     100
200
25
50    
0.15
0.2
0.3    
10     95     250
200
125
70    
36     2.7     0.35     1     0     Bi-directional
Low-side Capable
Programmable Gain    
Catalog     -40 to 125     VSSOP | 8     8VSSOP: 15 mm2: 4.9 x 3 (VSSOP | 8)