AS8500 - Data Sheet

austriamicrosystems

Revision 1.2, 08-Junel-06

www.austriamicrosystems.com

Page 6 of 41

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

cal_err

calibration error

for 30 000 digits output at

full range

G1, 720 mV

G6, 120 mV

G24, 30 mV

G50, 15 mV

G100, 7.5 mV

Device is not

factory

calibrated

%

1)

lin_err

nonlinearity

gain 6 @ room temp

0.1

gain 24 @ room temp

0.03

gain 50 @ room temp

0.05

gain 100 @ room temp

0.05

lin_errTC

TC of linearity error

all gains

1

5

ppm/K

3)

Vos

offset voltage:

RSHH_RSHL

-40 to 125°C

-0.5

0.2

0.5

µV

4)

offset voltage: ETS, ETR,

VBAT

-40 to 85°C

-2

0.5

1

µV

4)

85 to 125°C

-4

1

2

µV

4)

dVos/dT

Offset voltage drift: RSHH-

RSHL

-40 to 85 °C

0.002

µV/K

Ib

input bias/leakage current,

all channels

room temperature

-1000

0.2

1000

nA

5)

Vndin

voltage noise density

(G=24)

f=0 to 1 kHz

35

50

nV//Hz

6)

Indin

current noise density

(G=24)

f=10 Hz

20

fA//Hz

6)

en p_p

voltage noise, peak (G=24)

0 to 100 Hz

3

µV

6)

0 to 10 Hz

1

µV

6)

en_RMS

voltage noise, RMS (G=24) 1000 Hz

1.5

µV

6)

SNR

signal to noise (G=24, G=6) room temperature

100

dBmin

SDR

signal to distortion (G=24,

G=6)

room temperature

100

dBmin

CCI

chanel to chanel insulation

room temperature

-90

dBmax

PSRR

power supply rejection ratio 4.9 to 5.1 V

-60

dBmax

Notes:

1)

The output response might be calibrated by the user by writing appropriate calibration constants to the CAR register (see 7.5. ). The default values

are 1548 dec

2)

whatever is lower

3)

max limit is derived fromdevice characterization and not tested

4)

Min/Maximum limits over temperature range are derived from device characterization and not etsted. In normal operation a termperature independent

digital offset of -0.7 digits is present due to internal raunding.

5)

Typical leakage current is valid for all gain settings except G=1 for positive input voltages below 200 mV. In the temperature range 85-125°C it may

be as high as 5 nA. In normal operation a temperature independent digital offset of -0.7 digits is present due to internal rounding.

6)

This parameter is not measured directly. It is measured indirectly via gain measurement of the whole path at room temperature