ADM1025AARQ datasheet(12/21 Pages) ONSEMI

Part #	ADM1025AARQ

Description	Low Cost PC Hardware Monitor ASIC

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Manufacturer	ONSEMI [ON Semiconductor]

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ADM1025/ADM1025A

Preliminary Technical Data

Rev. P5 | Page 12 of 21| www.onsemi.com

INPUT CIRCUITS

The internal structure for the analog inputs is shown in

Figure 14. Each input circuit consists of an input protection

diode, an attenuator, plus a capacitor to form a first order low-

pass filter that gives the input immunity to high frequency

noise.

Figure 14. Structure of Analog Inputs

Table 5. A/D Output Code vs. VIN

Input Voltage

A/D Output

12 VIN

5 VIN

VCC/3.3 VIN

2.5 VIN

VCCPIN

Decimal

Binary

<0.062

<0.026

<0.0172

<0.013

<0.012

0

0000 0000

0.062−0.125

0.026–0.052

0.017–0.034

0.013–0.026

0.012–0.023

1

0000 0001

0.125–0.188

0.052−0.078

0.034−0.052

0.026−0.039

0.023−0.035

2

0000 0010

0.188−0.250

0.078−0.104

0.052−0.069

0.039−0.052

0.035−0.047

3

0000 0011

0.250−0.313

0.104−0.130

0.069−0.086

0.052−0.065

0.047−0.058

4

0000 0100

0.313−0.375

0.130−0.156

0.086−0.103

0.065−0.078

0.058−0.070

5

0000 0101

0.375−0.438

0.156−0.182

0.103−0.120

0.078−0.091

0.070−0.082

6

0000 0110

0.438−0.500

0.182−0.208

0.120−0.138

0.091−0.104

0.082−0.093

7

0000 0111

0.500−0.563

0.208−0.234

0.138−0.155

0.104−0.117

0.093−0.105

8

0000 1000

•

4.000−4.063

1.666−1.692

1.100−1.117

0.833−0.846

0.749−0.761

64 (1/4 Scale)

0100 0000

•

8.000−8.063

3.330−3.560

2.200−2.217

1.667−1.680

1.499−1.511

128 (1/2 Scale)

1000 0000

•

12.000−12.063

5.000−5.026

3.300−3.317

2.500−2.513

2.249−2.261

192 (3/4 Scale)

1100 0000

•

15.312−15.375

6.380−6.406

4.210−4.230

3.190−3.203

2.869−2.881

245

1111 0101

15.375−15.437

6.406−6.432

4.230−4.245

3.203−3.216

2.881−2.893

246

1111 0110

15.437−15.500

6.432−6.458

4.245−4.263

3.216−3.229

2.893−2.905

247

1111 0111

15.500−15.563

6.458−6.484

4.263−4.280

3.229−3.242

2.905−2.916

248

1111 1000

15.625−15.625

6.484−6.510

4.280−4.300

3.242−3.255

2.916−2.928

249

1111 1001

15.625−15.688

6.510−6.536

4.300−4.314

3.255−3.268

2.928−2.940

250

1111 1010

15.688−15.750

6.536−6.562

4.314−4.330

3.268−3.281

2.940−2.951

251

1111 1011

15.750−15.812

6.562−6.588

4.331−4.348

3.281−3.294

2.951−2.964

252

1111 1100

15.812−15.875

6.588−6.615

4.348−4.366

3.294−3.307

2.964−2.975

253

1111 1101

15.875−15.938

6.615−6.640

4.366−4.383

3.307−3.320

2.975−2.987

254

1111 1110

>15.938

>6.640

>4.383

>3.320

>2.988

255

1111 1111

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