AS8501 - Data Sheet

austriamicrosystems

Revision 1.1, 04-April-06

www.austriamicrosystems.com

Page 7 of 40

Electrical characteristics (continued)

VDDA=5V +/-0.1 V, fclk=8.192 MHz, chopping ratio MM=4 (see 7.5.3), oversampling frequency=2.048 MHz, oversampling ratio=128

temperature range : -40 to 125°C if not otherwise noted

symbol

parameter

conditions

min

typ

max

units

data conversion

RES

resolution

all channels

16

bits

1) 2)

Vref

reference voltage

room temperature

1.13

1.21

1.30

V

3)

Vref_TC

temperature coefficient of Vref

-50

50

ppm/K

4)

Vref_Ri

internal resistance of Vref

Rload > 50 kOhm

200

Ohm

fovs

clock frequency

4.096

MHz

R1

oversamplig ratio

64

128

MM

conversions during chopper cycle

4

8

BW

bandwidth

7.8

1000

16000

Hz

av

internal averaging

1

4

1024

cycles

fclk

external clock frequency

0.05

8.192

10

MHz

5)

CLK_extdiv

clock division factor

2

4

DR_clk

duty ratio of external clock

50

%

int_fclk

internal clock frequency

180

250

330

kHz

analog inputs

RSHH, VBAT, ETS, ETS

Rin

input resistance

Ue < 150 mV

50

100

MOhm

Cin

input capacitance at gain 24

8

15

30

pF

internal temperature sensor

T_out20

output at 23°C

G 6, typical

22500

23 000

23500

digits

6)

T_sl

slope

-20 to 100°C

73

75

77

digits/degC

7)

Terr85

error of temperature measurement 0 to 85°C

0.5

2

degC

7)

Terr125

-40 to 125°C

1

3

degC

7)

current source

output to RSHH, RSHL

Icurr_rshh

1.5

2

3

µA

Notes:

1)

with external averaging the resolution can be increased up to 21 bits with an effective sampling rate below 10 Hz

2

) the system works in overflow condition without degradation of accuracy up to 1.4 * range width.

This means that the overflow bit can work as bit no.17 in this range.

3)

the absolute value will be trimmed digitally to (1.28*/-0.01) V at 23°C, if not otherwise specified

4)

the TC-value will be trimmed digitally to end up with a typical TC-value of the output ( total measurement path) at G24 better than 20 ppm/K the

TC- value of the

reference voltage after trimming may be typically as high as 50 ppm/K due to manufacturing spread. Min,max limits are not tested but derived

from device

characterization

5)

in the temperature range 0 - 85°C the clock frequency can be increased to 12 MHz

6)

value trimmed to +/- 30 digits during final test and stored into ZZR

7)

The slope of the sensor is measured on sample basis per lot and not tested per device. The specified limits are derived from device

characterization.