AD629 datasheet(11/12 Pages) AD

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REV. A

AD629

–11–

Table IV. AD629 vs. INA117 AC Error Budget Example 2 (VCM =

100 V @ 500 Hz)

Error, ppm of FS

Error Source

AD629

INA117

AD629

INA117

ACCURACY, TA = 25

°C

Initial Gain Error

(0.0005

× 10) ÷ 10 V × 106

(0.0005

× 10) ÷ 10 V × 106

500

Offset Voltage

(0.001 V

÷ 10 V) × 106

(0.002 V

÷ 10 V) × 106

100

200

Total Accuracy Error:

600

700

TEMPERATURE DRIFT (85

°C)

Gain

10 ppm/

°C × 60°C

10 ppm/

°C × 60°C

600

Offset Voltage

(20

µV/°C × 60°C) × 106/10 V

(40

µV/°C × 60°C) × 106/10 V

120

240

Total Drift Error:

720

840

RESOLUTION

Noise, Typ, 0.01–10 Hz,

µV p-p

µV ÷ 10 V × 106

CMR @ 60 Hz

(141

× 10–6 × 1 V) ÷ 10 V × 106

(500

× 10–6 × 1 V) ÷ 10 V × 106

Nonlinearity

(10

–5

× 10 V) ÷ 10 V × 106

(10

–5

× 10 V) ÷ 10 V × 106

AC CMR @ 500 Hz

(141

× 10–6 × 200 V) ÷ 10 V × 106 (500 × 10–6 × 200 V) ÷ 10 V × 106

2,820

10,000

Total Resolution Error:

2,846

10,063

Total Error:

4,166

11,603

VOUT

REF(–)

–IN

+IN

–VS

+VS

REF(+)

AD629

21.1k

380k

20k

NC = NO CONNECT

SHUNT

10 AMPS

200VCM DC

TO GROUND

OUTPUT

CURRENT

60Hz

POWER LINE

0.1 F

Figure 37. Error Budget Analysis Example 1. VIN = 10 V

Full-Scale, VCM = 200 V DC. RSHUNT = 1

Ω, 1 V p-p 60 Hz

Power-Line Interference

Error Budget Analysis Example 2

This application is similar to the previous example except that

the sensed load current is from an ampliﬁer with an ac common-

mode component of

±100 V (frequency = 500 Hz) present on

the shunt (Figure 38). All other conditions are the same as

before. Note that the same kind of power line interference can

happen as detailed in Example 1. However, the ac common-

mode component of 200 V p-p coming from the shunt is much

larger than the interference of 1 V p-p, so that this interference

component can be neglected.

VOUT

REF(–)

–IN

+IN

–VS

+VS

REF(+)

AD629

21.1k

380k

20k

NC = NO CONNECT

SHUNT

10 AMPS

100V AC CM

TO GROUND

OUTPUT

CURRENT

60Hz

POWER LINE

0.1 F

Figure 38. Error Budget Analysis Example 2. VIN = 10 V

Full-Scale, VCM =

±100 V at 500 Hz, RSHUNT = 1 Ω

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