MAX9922 Maxim, MAX9922 Datasheet - Page 5

• Manufacturer Part Number: MAX9922
• Description: The MAX9922/MAX9923 ultra-precision, high-side current-sense amplifiers feature ultra-low offset voltage (VOS) of 25µV (max) and laser-trimmed gain accuracy better than 0
• Manufacturer: Maxim

ELECTRICAL CHARACTERISTICS (continued)
(V
= 0V, MAX9922 is set for A
are at T
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
Power-Down Supply Current
Power-Up Time
RSB
= V
A
= +25°C.) (Note 1)
RS+
PARAMETER
All devices are 100% production tested at T
V
Data sheet limits are guaranteed by design and bench characterization. Thermocouple effects preclude measurement of
this parameter during production testing. Devices are screened during production testing to eliminate defective units.
V
from +25°C to +85°C.
V
specified over a V
the part is rail-to-rail, and goes to within 25mV of the rails, but accuracy is not maintained. Linear operation is not guaran-
teed for V
This is the worst-case REF current needed to directly drive the bottom terminal of the gain setting resistors, at V
and V
MAX9923H/MAX9923F between the FB and REF pins, while in the MAX9922 the resistor is external and user selectable. A
voltage identical to the V
nitude and polarity of V
bias current for REF is typically 1pA in the MAX9922 since it connects to the gate of a MOS transistor. See the External
Reference section for more details.
The range of V
100V/V.
OS
OS
RSB
= V
is measured in bidirectional mode with V
drift limits are guaranteed by design and bench characterization and are the average of drift from -40°C to +25°C and
= V
REF
RS-
RS+
SENSE
= +12V, V
_______________________________________________________________________________________
= V
= 12V, V
DD
REF
V
voltages > ±150mV. See the Typical Operating Characteristics section for plots of Input vs. Output.
=100V/V (R1 = 1kΩ, R2 = 99kΩ), SHDN = V
SENSE
/2 while maintaining gain accuracy. An internal 1kΩ resistor (R1) is present in the MAX9923T/
, V
DD
CM
REF
= +3.3V, V
SENSE
SENSE
SYMBOL
range that keeps the output voltage 250mV away from the rails to achieve full accuracy. Output of
, and V
= V
I
RSBL
DD
, and in the MAX9922 it is dependent on the value of the external resistor as well. The input
develops across this resistor. In all versions the REF input current is dependent on the mag-
/2 for bipolar mode and V
SENSE
GND
V
MAX9922, A
10mV, V
value
DD
= 0V, V
may limit the output swing of the MAX9922 with adjustable gain set to less than
= V
A
REF
DD
REF
= +85°C. All temperature limits are guaranteed by design.
REF
= 0V to 3.3V, settling to 0.1% of final
= 0V, V
V
= V
= V
= 100V/V, V
Ultra-Precision, High-Side
DD
Current-Sense Amplifiers
DD
CONDITIONS
/2.
/2 for bidirectional, V
RSB
REF
= V
DD
REF
= 0V for unipolar mode. Gain accuracy and gain linearity are
, T
RS+
A
= 0V, V
= -40°C to +85°C, unless otherwise noted. Typical values
= V
RS-
SENSE
= 28V
REF
= 0V for unidirectional, V
=
MIN
TYP
0.05
800
SENSE
MAX
1
= V
DD
RS+
UNITS
= 3.3V,
- V
µA
µs
RS-
5