Datasheet

MAX9918/MAX9919/MAX9920
-20V to +75V Input Range, Precision
Uni-/Bidirectional, Current-Sense Amplifiers
3
Maxim Integrated
PARAMETERS SYMBOL CONDITIONS MIN TYP MAX UNITS
V
RS+
= V
RS-
= +14V ±1.2
MAX9918
V
RS+
= V
RS-
= -2V ±3.3
V
RS+
= V
RS-
= +14V ±1.8
MAX9919_
V
RS+
= V
RS-
= -2V ±1.8
V
RS+
= V
RS-
= +14V ±2.4
Input Offset Voltage Drift
(Note 3)
V
OSD
MAX9920
V
RS+
= V
RS-
= -2V ±8.8
μV/°C
Common-Mode Range V
CM
Inferred from CMRR tests -20 +75 V
-2V ≤ V
CM
≤ +14V 80
M AX 9918, M AX 9919
-20V ≤ V
CM
≤ +75V 96
-2V ≤ V
CM
≤ +14V 72
Common-Mode Rejection Ratio
(Note 3)
CMRR
MAX9920
-20V ≤ V
CM
≤ +75V 86
dB
T
A
= +25°C ±175
Input Bias Current I
RS+
, I
RS-
-20V ≤ V
CM
≤ +75V
T
A
= -40°C to +125°C ±250
μA
Input Offset Current ( I
RS +
- I
RS -
) 0 ±8 μA
Input Leakage Current in
Shutdown
-20V ≤ V
CM
≤ +75V, V
SHDN
= V
CC
= 5V ±30 μA
Input Leakage Current V
RS+
= V
RS-
= +14V, +75V, V
CC
= 0V ±30 μA
Common mode 300 kΩ
MAX9918,
MAX9919_
Differential 715 Ω
Common mode 330 kΩ
Input Resistance
MAX9920
Differential 224 Ω
MAX9918, MAX9919_ 50
Full-Scale Sense Voltage (Note 4) V
SENSE
Inferred from gain
error test
MAX9920 200
mV
MAX9918, MAX9920 Adj
MAX9919F 45Gain (Notes 2, 4) G
MAX9919N 90
V/V
MAX9918 30
Minimum Adjustable Gain G
ADJ
MAX9920 7.5
V/V
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 5V, V
RS+
= V
RS-
= +14V, V
SENSE
= (V
RS+
- V
RS-
) = 0V, V
SHDN
= V
GND
= 0V, V
REFIN
= V
CC
/2, R
L
= 100kΩ; for MAX9918, A
V
=
90V/V, R2/R1 = 89kΩ/1kΩ; for MAX9920, A
V
= 20V/V, R2/R1 = 79kΩ/1kΩ; T
A
= -40°C to +125°C, unless otherwise noted. Typical val-
ues are at T
A
= +25°C.) (Note 1)