DRV421_15 Datasheet, PDF (5/44 Pages) Texas Instruments – DRV421 Integrated Magnetic Fluxgate Sensor for Closed-Loop Current Sensing

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DRV421
SBOS704A – MAY 2015 – REVISED JULY 2015
6.5 Electrical Characteristics
All minimum and maximum specifications at T_A = +25°C, V_DD = 3.0 V to 5.5 V, and I_COMP1 = I_COMP2 = 0 mA (unless otherwise
noted). Typical values are at V_DD = 5.0 V.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNIT
FLUXGATE SENSOR FRONT-END
Offset ⁽¹⁾
No magnetic field
–8
±2
8
µT
Offset drift
No magnetic field
±5
nT/°C
Noise
f = 0.1 Hz to 10 Hz
17
nTrms
Noise density
f = 1 kHz
1.5
nT/√Hz
Saturation trip level for pin ER
1.7
mT
A_OL
DC open-loop gain
GSEL[1:0] = 00, at 3.8 kHz,
integration-to-flatband corner frequency
16
V/µT
8.5
V/mT
AC open-loop gain
GSEL[1:0] = 01, at 3.8 kHz,
integration-to-flatband corner frequency
GSEL[1:0] = 10, at 1.9 kHz,
integration-to-flatband corner frequency
38
V/mT
25
V/mT
GSEL[1:0] = 11, at 1.9 kHz,
integration-to-flatband corner frequency
70
V/mT
I_ICOMP
Peak current at pins ICOMP1 and
ICOMP2
V_ICOMP1 – V_ICOMP2 = 4.2 V_PP,V_DD = 5 V,
T_A = –40°C to +125°C
V_ICOMP1 – V_ICOMP2 = 2.5 V_PP, V_DD = 3.3 V,
T_A = –40°C to +125°C
210
250
125
150
mA
mA
V_ICOMP
Voltage swing at pins ICOMP1 and
ICOMP2
20-Ω load, V_DD = 5 V, T_A = –40°C to +125°C
20-Ω load, V_DD = 3.3 V, T_A = –40°C to +125°C
4.2
2.5
V_PP
V_PP
Common-mode output voltage at pins
ICOMP1 and ICOMP2
V_REFOUT
V
SHUNT SENSE AMPLIFIER
V_OO
CMRR
PSRR_AMP
V_IC
Z_IND
Z_IC
G
E_G
Output offset voltage
Output offset voltage drift
Common-mode rejection ratio, RTO ⁽²⁾
Power-supply rejection ratio, RTO
Common-mode input voltage range
Differential input impedance
Common-mode input impedance
Gain, V_OUT / (V_AINP – V_AINN)
Gain error
Gain error drift
V_AINP = V_AINN = V_REFIN, V_DD = 3.0 V
V_CM = −1 V to V_DD + 1 V, V_REFIN = V_DD / 2
V_DD = 3.0 V to 5.5 V, V_CM = V_REFIN
–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
V_DD + 1
23.5
60
0.3%
5
mV
µV/°C
µV/V
µV/V
V
kΩ
kΩ
V/V
ppm/°C
I_SC
BW_–3dB
SR
Linearity error
R_L = 1 kΩ
Voltage output swing from negative rail
(OR pin trip level)
V_DD = 5.5 V, I_VOUT = 2.5 mA
V_DD = 3.0 V, I_VOUT = 2.5 mA
Voltage output swing from positive rail
(OR pin trip level)
V_DD = 5.5 V, I_VOUT = –2.5 mA
V_DD = 3.0 V, I_VOUT = –2.5 mA
Short-circuit current
V_OUT connected to GND
V_OUT connected to VDD
Signal overrange indication delay (OR pin) V_IN = 1-V step
Bandwidth
Slew rate
V_DD – 85
V_DD – 100
12
48
56
V_DD – 48
V_DD – 56
–18
20
2.5 to 3.5
2
6.5
ppm
85
mV
100
mV
mV
mV
mA
mA
µs
MHz
V/µs
Settling time, large-signal
ΔV = ± 2 V to 1% accuracy, no external filter
0.9
µs
Settling time, small-signal
ΔV = ± 0.4 V to 0.01% accuracy
8
µs
e_n
V_REFIN
Output voltage noise density, RTO
Input voltage range at pin REFIN
f = 1 kHz, compensation loop disabled
T_A = –40°C to +125°C
GND
170
nV/√Hz
VDD
V
(1) Fluxgate sensor front-end offset can be reduced using the feature.
(2) Parameter value referred to output (RTO).
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