DRV425 Datasheet, PDF (5/37 Pages) Texas Instruments – DRV425 Fluxgate Magnetic-Field Sensor

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DRV425
SBOS729 – OCTOBER 2015
6.5 Electrical Characteristics
All minimum and maximum specifications are at T_A = 25°C, VDD = 3.0 V to 5.5 V, and I_DRV1 = I_DRV2 = 0 mA, unless otherwise
noted. Typical values are at VDD = 5.0 V.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNIT
FLUXGATE SENSOR FRONT-END
Offset
No magnetic field
–8
±2
8 µT
Offset drift
No magnetic field
±5
nT/°C
G
Gain
Current at DRV1 and DRV2 outputs
12.2
mA/mT
Gain error
±0.04%
Gain drift
Best-fit line method
±7
ppm/°C
Linearity error
0.1%
Hysteresis
Magnetic field sweep from –10 mT to 10 mT
1.4
µT
Noise
f = 0.1 Hz to 10 Hz
17
nTrms
Noise density
f = 1 kHz
1.5
nT/√Hz
Compensation range
–2
2 mT
Saturation trip level for the
ERROR pin⁽¹⁾
Open-loop, uncompensated field
1.6
mT
ERROR delay
Open-loop at B > 1.6 mT
4 to 6
µs
BW
Bandwidth
I_OS
Short-circuit current
BSEL = 0, R_SHUNT = 22 Ω
BSEL = 1, R_SHUNT = 22 Ω
VDD = 5 V
VDD = 3.3 V
32
kHz
47
250
mA
150
Common-mode output voltage at the
DRV1 and DRV2 pins
V_REFOUT
V
Compensation coil resistance
100
Ω
SHUNT-SENSE AMPLIFIER
V_OO
CMRR
PSRR_AMP
V_ICR
z_id
z_ic
G_nom
E_G
Output offset voltage
Output offset voltage drift
V_AINP = V_AINN = V_REFIN, VDD = 3.0 V
Common-mode rejection ratio, RTO⁽²⁾
Power-supply rejection ratio, RTO⁽²⁾
Common-mode input voltage range
V_CM = –1 V to VDD + 1 V, V_REFIN = VDD / 2
VDD = 3.0 V to 5.5 V, V_CM = V_REFIN
Differential input impedance
Common-mode input impedance
Nominal gain
Gain error
V_VOUT / (V_AINP – V_AINN)
Gain error drift
–0.075
–2
–250
–50
–1
16.5
40
–0.3%
–5
±0.01
±0.4
±50
±4
20
50
4
±0.02%
±1
0.075
2
250
50
VDD + 1
23.5
60
0.3%
5
mV
µV/°C
µV/V
µV/V
V
kΩ
kΩ
V/V
ppm/°C
Linearity error
12
ppm
Voltage output swing from negative
rail (OR pin trip level)⁽¹⁾
Voltage output swing from positive rail
(OR pin trip level)⁽¹⁾
Signal overrange indication delay
(OR pin)⁽¹⁾
VDD = 5.5 V, I_VOUT = 2.5 mA
VDD = 3.0 V, I_VOUT = 2.5 mA
VDD = 5.5 V, I_VOUT = –2.5 mA
VDD = 3.0 V, I_VOUT = –2.5 mA
V_IN = 1-V step
VDD – 85
VDD – 100
48
56
VDD – 48
VDD – 56
2.5 to 3.5
85
mV
100
mV
µs
I_OS
Short-circuit current
VOUT connected to GND
VOUT connected to VDD
–18
mA
20
BW_–3dB
SR
Bandwidth
Slew rate
2
MHz
6.5
V/µs
Large signal ΔV = ± 2 V to 1%, no external filter
t_sa
Settling time
Small signal ΔV = ± 0.4 V to 0.01%
0.9
µs
8
e_n
V_REFIN
Output voltage noise density
Input voltage range at pin REFIN
f = 1 kHz, compensation loop disabled
Input voltage range at REFIN pin
GND
170
nV/√Hz
VDD
V
(1) See the Magnetic Field Range, Overrange Indicator, and Error Flag section for details on the behavior of the ERROR and OR outputs.
(2) Parameter value is referred-to-output (RTO).
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