Vicom Systems FC-FC3 Manual do Utilizador descarregar pdf (Página 19)

CONFIDENTIAL [AK8999A/AW/AD]

MS1600-E-00 2014/05

- 19 -

7.2.2) Noise Characteristics

VDD = 3, 3.3, 5V ± 10%, Ta = -40 to 105ºC, register default, unless otherwise note

Parameter Symbol Conditions Min.

Typ.

note1)

Max.

note2)

Units

Description

Noise

Nout1

VP/VN→VOUT

External feedback

capacitance 2.2nF

ESCR[0]=1h

230 530 μVrms @1Hz -

100kHz

Nout2

VP/VN→VOUT

ESCF[1:0]=1h

ESCR[0]=1h

250 550 μVrms @1Hz -

100kHz

note1) VDD = 5V, Temp. = 25C, Total gain: 60x (G1 gain: 10x, G2 gain: 1.5x, G3 gain: 1.8x, S/H gain: 2x,

Buffer gain: 1.111x), Output reference voltage = 0.02*VDD, Sampling frequency = 8.33kHz, Sensor

drive voltage=4V, Internal temperature sensor use, Offset Voltage = 0mV, Offset temp. drift 1st order

coefficient = 0mV/C, Span Voltage = 80mV, Sensitivity temp. drift 1st order coefficient =

0ppm/C. Design reference value; no production test performed.

note2) Total gain: 60x@25C (G1 gain: 10x, G2 gain: 1.5x, G3 gain: 1.8x, S/H gain: 2x, Buffer gain:

1.111x), Output reference voltage = 0.02*VDD, Sampling frequency = 8.33kHz, Internal

temperature sensor use, Sensor drive voltage=4V(VDD=5V±10%)/2.2V(VDD=3V, 3.3V±10%),

Offset Voltage@25C = ±35mV(VS = 4V)/±19.25mV(VS = 2.2V), Offset temp. drift 1st order

coefficient = ±0.08mV/C (VS = 4V)/±0.044mV/C (VS = 2.2V), Span Voltage @25C = 0 to

80mV(VS = 4V) / 0 to 40mV(VS = 2.2V), Sensitivity temp. drift 1st order coefficient = -4000 to

+2500ppm/C. Design reference value; no production test performed.

7.2.3) G1/2 Gain Adjustment Circuit

VDD = 3, 3.3, 5V ± 10%, Ta = -40 to 105ºC, register default, unless otherwise note

Parameter Symbol Conditions Min. Typ. Max.

Units

Description

Measurement in test mode

Unadjusted G1/2

output voltage

Vg1 VP-VN = 80mV

VDD = 5V ± 10%

1150 1200 1250 mV

Vg2 VP-VN = 40mV

VDD = 3, 3.3 ± 10%

550 600 650 mV

G1 adjustment

range

G1sc+ EIG[3:0] = Ch 5 times

G1sc- EIG[3:0] = 0h 70 times

Adj. Step G1stp 2,3,5,10 times

G2 G2sc1+ EIG[4] = 0h 3 times

G2sc1- EIG[4] = 1h 1.5 times

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 67 68

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