AK8998 Datasheet, PDF (17/59 Pages) Asahi Kasei Microsystems – Preliminary

[AK8998/W/D]
9-1-2) Reference Section (packaged version only) Characteristics
VDD=5V±5%, Ta= 25ºC, unless otherwise noted
Item
Symbol
Conditions
Min.
Typ.
Max. units Comments
VREF voltage Vr0P
0.99
1.0
1.01
V After adj.
VS voltage
VS4P Load resistance 1kΩ 3.88
VS2P Load resistance 0.82kΩ 2.134
4.00
2.20
4.12
2.266
V After adj.
V After adj.
IREF current Ir0P
0.9
1.0
1.1
µA After adj.
OSC freq.
Fr0P
0.9
1.0
1.1 MHz After adj.
VTMP voltage Vｔ0P ETMP[0]=1h
0.988 1.0 1.012 V After adj.
Note) AK8998 is shipped with adjustment at VDD=5V&VS=4V (EVD[1:0]=0h) and internal
temperature sensor use (ETMP[0]=1h). If VDD=5V&VS=2.2V (EVD[1:0]=1h),
VDD=3.3V&VS=2.2V(EVD[1:0]=2h), VDD=3V&VS=2.2V(EVD[1:0]=3h) and external
temperature sensor use (ETMP[0]=0h) are the actual operating condition, readjustment is
required. Even if VDD=5V&VS=4V (EVD[1:0]=0h) and internal temperature sensor use
(ETMP[0]=1h) are the operating condition, readjustment is recommended.
9-2) Gain Amplifier etc.
Unless otherwise specified, the following requirements apply.
• Reference Section is complete with adjustment.
• For supply voltage of 5V (3V), sensor drive voltage of 4V (2.2V), the level diagram
includes G1 gain of 10x, G2 gain of 1.5x, G3 gain of 1.8x, Total gain of 60x, Level shift
0.02*VDD and the output voltage 4800mV (2400mV) is set as 100% based on a
differential input of 80mV (40mV).
9-2-1) Overall Characteristics
VDD=3, 3.3, 5V±5%, Ta=-20 to 85ºC, register default, unless otherwise noted
Item
Symbol
Conditions
Min.
Typ.
Max. units Comments
Std. gain
Gtyp VP/VN→VOUT
60
times
Input common Vicom
0.45VS 0.5*VS 0.55VS V
voltage
Output common Vcom0 VP/VN→VOUT
0.5*VDD
V
voltage
VP=VN=0.5*VS
Vmax+ VP/VN→VOUT
0.98
V
Max. output
VP-VN=VSS or VDD *VDD
range
Vmax-
0.02
V
*VDD
VP/VN→VOUT
260 µVrms @1Hz -
Nout1
VP=VN=Open
External feedback
100kHz
Note)
Noise
capacitance 2.2nF
VP/VN→VOUT
300 µVrms @1Hz -
Nout2 VP=VN=Open
100kHz
ESCF[1:0]=1h
Note)
Note) Value for total gain of 180x (G1 gain: 30x, G2 gain: 1.5x, G3 gain: 1.8x, S/H gain: 2x, Buffer
gain: 1.111x). Design reference value; no production test performed.
MSxxxxx-E-00
- 17 -
2012/11