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AMC1301

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SBAS667D – APRIL 2016 – REVISED JANUARY 2017

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Typical Applications (continued)

9.2.1.1 Design Requirements

Table 1 lists the parameters for the typical application in Figure 49.

Table 1. Design Requirements

PARAMETER

VALUE

High-side supply voltage

3.3 V or 5 V

Low-side supply voltage

3.3 V or 5 V

Voltage drop across the shunt for a linear response

± 250 mV (maximum)

9.2.1.2 Detailed Design Procedure

The high-side power supply (VDD1) for the AMC1301 device is derived from the power supply of the upper gate

driver. Further details are provided in the Power Supply Recommendations section.

The floating ground reference (GND1) is derived from one of the ends of the shunt resistor that is connected to

the negative input of the AMC1301 device (VINN). If a four-pin shunt is used, the inputs of the AMC1301 device

are connected to the inner leads and GND1 is connected to one of the outer shunt leads.

•

The voltage drop caused by the nominal current range must not exceed the recommended differential input

•

The voltage drop caused by the maximum allowed overcurrent must not exceed the input voltage that causes

differential output signal. Tailor the bandwidth of this RC filter to the bandwidth requirement of the system. TI

For more information on the general procedure to design the filtering and driving stages of SAR ADCs, consult

the TI Precision Designs 18-Bit, 1MSPS Data Acquisition Block (DAQ) Optimized for Lowest Distortion and Noise

(SLAU515) and 18-Bit Data Acquisition Block (DAQ) Optimized for Lowest Power (SLAU513), available for

download at www.ti.com.