INA200 datasheet(12/19 Pages) BURR-BROWN

Part #	INA200

Description	High-Side Measurement Current-Shunt Monitor with Comparator and Reference

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Manufacturer	BURR-BROWN [Burr-Brown (TI)]

Direct Link	http://www.burr-brown.com

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12 / 19 page

INA200

INA201

INA202

SBOS374 − NOVEMBER 2006

www.ti.com

12

MOVs or VDRs is not recommended except when they are

used in addition to a semiconductor transient absorber.

Select the transient absorber such that it will never allow

the INA200, INA201, and INA202 to be exposed to

transients greater than +80V (that is, allow for transient

absorber tolerance, as well as additional voltage due to

transient absorber dynamic impedance). Despite the use

of internal zener-type ESD protection, the INA200,

INA201, and INA202 do not lend themselves to using

external resistors in series with the inputs since the internal

gain resistors can vary up to

±30%. (If gain accuracy is not

important, then resistors can be added in series with the

INA200, INA201, and INA202 inputs with two equal

resistors on each input.)

OUTPUT VOLTAGE RANGE

The output of the INA200, INA201, and INA202 is accurate

within the output voltage swing range set by the power

supply pin, V+. This performance is best illustrated when

using the INA202 (a gain of 100 version), where a 100mV

full-scale input from the shunt resistor requires an output

voltage swing of +10V, and a power-supply voltage

sufficient to achieve +10V on the output.

INPUT FILTERING

An obvious and straightforward location for filtering is at

the output of the INA200, INA201, and INA202 series;

however, this location negates the advantage of the low

output impedance of the internal buffer. The only other

option for filtering is at the input pins of the INA200,

INA201, and INA202, which is complicated by the internal

5k

Ω + 30% input impedance; this is shown in Figure 5.

Using the lowest possible resistor values minimizes both

the initial shift in gain and effects of tolerance. The effect

on initial gain is given by Equation 3:

Gain Error %

+ 100 * 100

5k

W

5k

W ) R

FILT

Total effect on gain error can be calculated by replacing the

5k

Ω term with 5kΩ − 30%, (or 3.5kΩ) or 5kΩ + 30% (or

6.5k

Ω). The tolerance extremes of RFILT can also be

inserted into the equation. If a pair of 100. 1% resistors are

used on the inputs, the initial gain error will be 1.96%.

Worst-case tolerance conditions will always occur at the

lower excursion of the internal 5k

Ω resistor (3.5kΩ), and

the higher excursion of RFILT − 3% in this case.

Note that the specified accuracy of the INA200, INA201,

and INA202 must then be combined in addition to these

tolerances. While this discussion treated accuracy

worst-case conditions by combining the extremes of the

resistor values, it is appropriate to use geometric mean or

root sum square calculations to total the effects of

accuracy variations.

COMPARATOR

The INA200, INA201, and INA202 devices incorporate an

open-drain comparator. This comparator typically has

2mV of offset and a 1.3

µs (typical) response time. The

output of the comparator latches and is reset through the

RESET pin, see Figure 6.

R

SHUNT << RFILTER

3m

Ω

V

SUPPLY

Load

R

FILTER <100Ω

R

FILTER <100Ω

C

FILTER

1

2

3

4

8

7

6

5

CMP

OUT

RESET

V

IN+

V

IN

−

V+

OUT

CMP

IN

GND

INA200

− INA202

SO−14, TSSOP−14

f−3dB =

1

2

π(2R

FILTER)CFILTER

f−3dB

G

0.6V

Reference

Comparator

Figure 5. Input Filter (Gain Error — 1.5% to −2.2%)

(3)

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