Datasheet
MAX9934
High-Precision, Low-Voltage, Current-Sense Amplifier
with Current Output and Chip Select for Multiplexing
3
Maxim Integrated
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX9934T 25
Current Gain (Transconductance) G
M
MAX9934F 5
µA/mV
T
A
= +25°C ±0.25
MAX9934T
-40°C ≤ T
A
≤ +125°C ±2.0
T
A
= +25°C ±0.25
Current Gain Error
(Note 4)
G
ME
MAX9934F
-40°C ≤ T
A
≤ +125°C ±2.4
%
MAX9934T ±200
Gain Error Drift G
ME
/dT
MAX9934F ±240
ppm/°C
Input-Bias Current for RS+ I
BRS+
V
RS+
= V
RS-
= 5.5V 0.1 100 nA
V
RS+
= V
RS-
≤ V
CC
- 0.2V 0.1 100 nA
Input-Bias Current for RS- I
BRS-
V
RS+
= V
RS-
= 5.5V 35 60 µA
Input Leakage Current I
LEK
V
CC
= 0V, V
RS+
= V
RS-
= 5.5V 0.1 100 nA
DC CHARACTERISTICS
Minimum Current for Output Low I
OL
Unidirectional, V
OL
= I
OL
x R
OUT
1 100 nA
V
OH
I
OUT
= +600µA, V
OH
= V
CC
- V
OUT
0.1 0.25
Output-Voltage Range
(MAX9934T)
V
OL
I
OUT
= -600µA, bidirectional 0.15 0.25
V
V
OH
I
OUT
= +375µA, V
OH
= V
CC
- V
OUT
0.18 0.30
Output-Voltage Range
(MAX9934F)
V
OL
I
OUT
= -375µA, bidirectional 0.18 0.26
V
Deselected Amplifier Output
Leakage
I
OLK
V
CS
= 0V, V
OUT
= 3.6V,
and 0 ≤ V
CC
≤ 3.6V
0.1 100 nA
LOGIC I/O (CS)
Input Voltage Low CS V
IL
0.54 V
Input Voltage High CS V
IH
1.26 V
Input Current CS I
IL
,I
IH
0 ≤ V
CS
≤ V
CC
0.1 100 nA
POWER SUPPLY
Supply-Voltage Range V
CC
Guaranteed by PSRR 2.5 3.6 V
Power-Supply Rejection Ratio PSRR
2.5V ≤ V
CC
≤ 3.6V,
V
RS+
= V
RS-
= 2V (Note 3)
110 120 dB
Supply Current I
CC
V
CC
= 3.3V, R
OUT
= 10kΩ to 3.3V,
V
RS+
= V
RS-
= 3.1V
120 230 µA
Supply Current, Output
Deselected
I
CC
,
DES
V
CS
= 0V, R
OUT
= 10kΩ to 3.3V,
V
RS+
= V
RS-
= 3.1V
120 210 µA
AC CHARACTERISTICS (C
L
= 1000pF)
MAX9934T
G
M
= 25µA/mV, V
SENSE
= 5mV
1.5
Amplifier Bandwidth BW
MAX9934F
G
M
= 5µA/mV, V
SENSE
= 25mV
5
kHz
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 3.3V, V
RS+
= V
RS-
= 3.0V, V
SENSE
= 0V, V
CM
= (V
RS+
+ V
RS-
)/2, V
CS
= 3.3V, R
OUT
= 10kΩ to GND for unidirectional opera-
tion, R
OUT
= 10kΩ to V
CC
/2 for bidirectional operation. T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
=
+25°C.) (Note 2)