AMC1200 ±250mV-Input, Basic Isolated Amplifier for Current Sensing | TI.com

AMC1200 (ACTIVE)

±250mV-Input, Basic Isolated Amplifier for Current Sensing

 

Learn about our new ±250-mV Input, high CMTI reinforced isolated amplifier for current sensing AMC1300.

See how the AMC1200 and other TI products combine to create a unique Brushless DC Motor Drive solution

Description

The AMC1200 and AMC1200B are precision isolation amplifiers with an output separated from the input circuitry by a silicon dioxide (SiO2) barrier that is highly resistant to magnetic interference. This barrier has been certified to provide galvanic isolation of up to 4250 VPEAK (AMC1200B) or 4000 VPEAK (AMC1200) according to UL1577 and VDE V 0884-10. Used in conjunction with isolated power supplies, these devices prevent noise currents on a high common mode voltage line from entering the local ground and interfering with or damaging sensitive circuitry.

The input of the AMC1200 or AMC1200B is optimized for direct connection to shunt resistors or other low voltage level signal sources. The excellent performance of the device supports accurate current control resulting in system-level power saving and, especially in motor-control applications, lower torque ripple. The common mode voltage of the output signal is automatically adjusted to either the 3-V or 5-V low-side supply.

The AMC1200 and AMC1200B are fully specified over the extended industrial temperature range of –40°C to 105°C and are available in a wide-body SOIC-8 package (DWV) and a gullwing-8 package (DUB).

Features

  • ±250-mV Input Voltage Range Optimized for
    Shunt Resistors
  • Very Low Nonlinearity: 0.075% Maximum at 5 V
  • Low Offset Error: 1.5 mV Maximum
  • Low Noise: 3.1 mVRMS Typical
  • Low High-Side Supply Current:
    8 mA Maximum at 5 V
  • Input Bandwidth: 60 kHz Minimum
  • Fixed Gain: 8 (0.5% accuracy)
  • High Common Mode Rejection Ratio: 108 dB
  • 3.3-V Operation on Low-Side
  • Certified Galvanic Isolation:
    • UL1577 and VDE V 0884-10 Approved
    • Isolation Voltage: 4250 VPEAK (AMC1200B)
    • Working Voltage: 1200 VPEAK
    • Transient Immunity: 10 kV/µs Minimum
  • Typical 10-Year Lifespan at Rated Working
    Voltage (see Application Report SLLA197)
  • Fully Specified Over the Extended Industrial
    Temperature Range

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Parametrics Compare all products in Isolated amplifiers

 
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)
AMC1200 AMC1100 AMC1200-Q1
±0.25     ±0.25     ±0.25    
800     800     800    
4250     4250     4250    
10     2.5     10    
1.5     1.5     1.5    
1.5     1.5     1.5    
1     1     1    
56     56     56    
0.075     0.075     0.075    
100     100     100    
Catalog     Catalog     Automotive    
-40 to 105     -40 to 105     -40 to 105