AMC1302 ±50mV-Input High-Precision Reinforced Isolated Amplifier for Current Sensing | TI.com

AMC1302 (ACTIVE) ±50mV-Input High-Precision Reinforced Isolated Amplifier for Current Sensing

 

Automotive AEC-Q100 Grade 1 qualified version available, see AMC1302-Q1.

Description

The AMC1302 is a precision isolated amplifier with a capacitive isolation barrier that has high immunity to magnetic interference. This barrier provides reinforced isolation of 5 kVRMS (maximum) with a very long lifetime and low power dissipation. When used with isolated power supplies, this device isolates components that operate on different common-mode voltage levels. Furthermore, the AMC1302 also protects lower-voltage devices from damage.

The input of the AMC1302 is optimized for direct connection to shunt resistors or other low voltage-level signal sources. The ±50-mV input voltage range allows significant reduction of the power dissipation through the shunt. Additionally, the low high-side supply current and voltage of the AMC1302 allow use of low-cost isolated power-supply solutions. The performance of the device supports accurate current control resulting in system-level power savings and in low torque ripple that is particularly important in motor control applications. The integrated input common-mode overvoltage and missing high-side supply voltage detection features of the AMC1302 simplify system-level diagnostics.

Features

  • ±50-mV Input Voltage Range for Low Dissipation, Shunt-Resistor-Based Current Measurement
  • Fixed Gain With Low Drift: 41 ± 0.3%, ±50 ppm/°C
  • Low Input Offset and Drift: ±100 µV, ±0.8 µV/°C
  • Low Nonlinearity and Drift: ±0.03%, ±1 ppm/°C
  • Very Low Isolated High-Side Power Dissipation When Operated From a 3.3-V Supply
  • System-Level Diagnostic Features
  • Safety-Related Certifications:
    • 7071-VPK Reinforced Isolation per DIN V VDE V 0884-11 (VDE V 0884-11): 2017-01
    • 5000-VRMS Isolation for 1 Minute per UL1577
  • Extended Industrial Temperature Range:
    –55°C to +125°C
  • High CMTI: 80 kV/µs (typ), 55 kV/µs (min)

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Parametrics

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Part number Order Input range (Vp-p) Isolation working voltage VIOWM (rms) (V) Isolation transient overvoltage VIOTM (peak) (V) CMTI (Min) (kV/µs) Input offset (+/-) (Max) (mV) Input offset drift (+/-) (Typ) (uV/C) Gain error (+/-) (Max) (%) Gain error drift (+/-) (Typ) (ppm/°C) Gain non-linearity (+/-) (Max) (%) Small signal bandwidth (Typ) (kHz) Rating Operating temperature range (C)
AMC1302 Order now ±0.05     1500     7000     55     0.2     1     0.3     15     0.03     280     Catalog     -55 to 125    
AMC1300 Order now ±0.25     1500     7000     15
75    
2
0.2    
1.3
1    
1
0.3    
50
15    
0.03     230
310    
Catalog     -40 to 125
-55 to 125    
AMC1301 Order now ±0.25     1000     7000     15     0.2     1     0.3     15     0.03     210     Catalog     -40 to 125
-55 to 125    
AMC1301-Q1 Order now ±0.25     1000     7000     15     0.2     1     0.3     15     0.03     210     Automotive     -40 to 125    
AMC1311 Order now 2     1500     7000     15
75    
9.9
1.5    
20
3    
1
0.3    
30
5    
0.04     220
275    
Catalog     -40 to 125
-55 to 125