AD629ARZ-R7 datasheet(13/16 Pages) AD

13 / 16 page

AD629

Rev. B | Page 13 of 16

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 (see Figure 39). 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;

therefore, this interference component can be neglected.

REF (–)

OUTPUT

CURRENT

60Hz

POWER LINE

1Ω

SHUNT

REF (+)

–VS

+VS

VOUT

–IN

+IN

0.1µF

NC = NO CONNECT

21.1kΩ

380kΩ

20kΩ

380kΩ

AD629

10 AMPS

±100V AC CM

TO GROUND

Figure 39. Error Budget Analysis Example 2: VIN = 10 V Full-Scale,

VCM = ±100 V at 500 Hz, RSHUNT =1 Ω

Table 6. 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

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

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, Typical, 0.01 Hz to 10 Hz, μV p-p

15 μV/10 V × 106

25 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

AC CMR @ 500 Hz

(141 × 10-6 × 200 V)/10 V × 106

(500 × 10-6 × 200 V)/10 V × 106

2820

10,000

Total Resolution Error

2846

10,063

Total Error

4166

11,603

AD629ARZ-R7 Datasheet(PDF) 13 Page - Analog Devices

AD629ARZ-R7 Datasheet(HTML) 13 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

Datasheet Descarga

Enlace URL