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OUT1

OUT2

100mV

20mV

RTI(Referred-To-Input)=

OUT1

- 100mV

2.0

1.8

1.6

1.4

1.2

1.0

0.8

0.6

0.4

0.2

(mV)

SENSE

Actual

Ideal

INA200

INA201

INA202

www.ti.com

SBOS374C – NOVEMBER 2006 – REVISED OCTOBER 2010

Normal Case 1: VSENSE ≥ 20mV, VCM ≥ VS

larger-than-normal offset can appear at the current

shunt monitor output with a typical maximum value of

This

region

operation

provides

the

highest

VOUT = 300mV for VSENSE = 0mV. As VSENSE

accuracy.

Here,

the

input

offset

voltage

approaches 20mV, VOUT returns to the expected

characterized

and

measured

using

two-step

output value with accuracy as specified in the

method. First, the gain is determined by Equation 1.

Electrical Characteristics. Figure 27 illustrates this

effect using the INA202 (Gain = 100).

(1)

where:

VOUT1 = Output Voltage with VSENSE = 100mV

VOUT2 = Output Voltage with VSENSE = 20mV

Then the offset voltage is measured at VSENSE =

100mV and referred to the input (RTI) of the current

shunt monitor, as shown in Equation 2.

(2)

In the Typical Characteristics, the Output Error vs

Common-Mode Voltage curve (Figure 7) shows the

highest accuracy for the this region of operation. In

this plot, VS = 12V; for VCM ≥ 12V, the output error is

Figure 27. Example for Low VSENSE Cases 1 and 3

at its minimum. This case is also used to create the

(INA202, Gain = 100)

VSENSE ≥ 20mV output specifications in the Electrical

Characteristics table.

Low VSENSE Case 2: VSENSE < 20mV, 0V ≤ VCM ≤ VS

Normal Case 2: VSENSE ≥ 20mV, VCM < VS

This region of operation is the least accurate for the

This region of operation has slightly less accuracy

INA200

family.

achieve

the

wide

input

than Normal Case 1 as a result of the common-mode

common-mode voltage range, these devices use two

operating area in which the part functions, as seen in

op amp front ends in parallel. One op amp front end

the Output Error vs Common-Mode Voltage curve

operates in the positive input common-mode voltage

(Figure 7). As noted, for this graph VS = 12V; for VCM

range, and the other in the negative input region. For

< 12V, the Output Error increases as VCM becomes

this case, neither of these two internal amplifiers

less than 12V, with a typical maximum error of

dominates and overall loop gain is very low. Within

0.005% at the most negative VCM = –16V.

this region, VOUT approaches voltages close to linear

operation levels for Normal Case 2. This deviation

Low VSENSE Case 1:

from linear operation becomes greatest the closer

VSENSE < 20mV, –16V ≤ VCM < 0; and

VSENSE approaches 0V. Within this region, as VSENSE

Low VSENSE Case 3:

approaches 20mV, device operation is closer to that

VSENSE < 20mV, VS < VCM ≤ 80V

described by Normal Case 2. Figure 28 illustrates this

Although the INA200 family of devices are not

behavior for the INA202. The VOUT maximum peak for

designed for accurate operation in either of these

this case is tested by maintaining a constant VS,

regions, some applications are exposed to these

setting VSENSE = 0mV and sweeping VCM from 0V to

conditions. For example, when monitoring power

VS. The exact VCM at which VOUT peaks during this

supplies that are switched on and off while VS is still

test varies from part to part, but the VOUT maximum

applied to the INA200, INA201, or INA202, it is

peak is tested to be less than the specified VOUT

important to know what the behavior of the devices

tested limit.

will be in these regions.

As VSENSE approaches 0mV, in these VCM regions,

the

device

output

accuracy

degrades.

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