INA198AIDBVT datasheet(9/24 Pages) TI1

Part #	INA198AIDBVT

Description	CURRENT SHUNT MONITOR ??6V to 80V Common-Mode Range

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Manufacturer	TI1 [Texas Instruments]

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Actual

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INA193, INA194

INA195, INA196

INA197, INA198

www.ti.com

SBOS307F – MAY 2004 – REVISED FEBRUARY 2010

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

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

This region of operation has slightly less accuracy

This region of operation is the least accurate for the

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

INA193

−INA198 family. To achieve the wide input

operating area in which the part functions, as seen in

common-mode voltage range, these devices use two

the Output Error vs Common-Mode Voltage curve

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

(Figure 6). As noted, for this graph VS = 12V; for VCM

operates in the positive input common-mode voltage

< 12V, the Output Error increases as VCM becomes

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

less than 12V, with a typical maximum error of

this case, neither of these two internal amplifiers

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

dominates and overall loop gain is very low. Within

this region, VOUT approaches voltages close to linear

Low VSENSE Case 1:

operation levels for Normal Case 2. This deviation

VSENSE < 20mV, −16V ≤ VCM < 0;

from linear operation becomes greatest the closer

and Low VSENSE Case 3:

VSENSE approaches 0V. Within this region, as VSENSE

VSENSE < 20mV, VS < VCM ≤ 80V

approaches 20mV, device operation is closer to that

described by Normal Case 2. Figure 20 illustrates this

Although the INA193

−INA198 family of devices are

behavior for the INA195. The VOUT maximum peak for

not 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 INA193

−INA198. It is important to know

peak is tested to be less than the specified VOUT

what the behavior of the devices will be in these

Tested Limit.

regions.

As VSENSE approaches 0mV, in these VCM regions,

the

device

output

accuracy

degrades.

A

larger-than-normal offset can appear at the current

shunt monitor output with a typical maximum value of

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

approaches 20mV, VOUT returns to the expected

output value with accuracy as specified in the

Electrical Characteristics. Figure 19 illustrates this

effect using the INA195 and INA198 (Gain = 100).

(1) INA193, INA196 VOUT Tested Limit = 0.4V. INA194, INA197

VOUT Tested Limit = 1V.

Figure 20. Example for Low VSENSE Case 2

(INA195, INA198: Gain = 100)

Figure 19. Example for Low VSENSE Cases 1 and 3

(INA195, INA198: Gain = 100)

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Product Folder Link(s): INA193 INA194 INA195 INA196 INA197 INA198

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