Operating Temperature Range ........................... -40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range ............................ -65°C to +150°C
Lead Temperature (excluding UCSP, soldering, 10s) ..... +300°C
Soldering Temperature (reflow) .......................................+260°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Electrical Characteristics
(V
RS+
= V
RS-
= 3.6V, V
SENSE
= (V
RS+
- V
RS-
) = 0V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
V
RS+
= 5V, T
A
= +25°C
Supply Current (Note 2)
I
CC
V
RS+
= 5V, -40°C < T
A
< +85°C
V
RS+
= 28V, T
A
= +25°C
V
RS+
= 28V, -40°C < T
A
< +85°C
Common-Mode Input Range
Common-Mode Rejection Ratio
Input Offset Voltage (Note 3)
V
CM
CMRR
V
OS
Guaranteed by CMRR , -40°C < T
A
< +85°C
1.6V < V
RS+
< 28V, -40°C < T
A
< +85°C
T
A
= +25°C
-40°C < T
A
< +85°C
MAX9938T
Gain
G
MAX9938F
MAX9938H
MAX9938W
MAX9938T/MAX9938F/
MAX9938H
MAX9938W
Output Resistance
R
OUT
(Note 5)
Gain = 25
OUT Low Voltage
V
OL
Gain = 50
Gain = 100
Gain = 200
OUT High Voltage
Small-Signal Bandwidth
(Note 5)
Output Settling Time
V
OH
V
OH
= V
RS-
- V
OUT
(Note 6)
V
SENSE
= 50mV, gain = 25
BW
V
SENSE
= 50mV, gain = 50
V
SENSE
= 50mV, gain = 100
V
SENSE
= 50mV, gain = 200
t
S
1% final value, V
SENSE
= 50mV
TA = +25°C
-40°C < T
A
< +85°C
T
A
= +25°C
-40°C < T
A
< +85°C
MAX9938T/F/H
MAX9938W
7.0
14.0
10
20
1.5
3
6
12
0.1
125
60
30
15
100
µs
kHz
25
50
100
200
±0.1
±0.1
±0.5
±0.6
±0.7
±0.8
13.2
26.4
15
30
60
120
0.2
V
V
mV
kΩ
%
V/V
1.6
94
130
±100
±500
±600
1.1
MIN
TYP
0.5
MAX
0.85
1.1
1.8
2.5
28
V
dB
µV
µA
UNITS
Gain Error (Note 4)
GE
www.maximintegrated.com
Maxim Integrated │
2
MAX9938
nanoPower, 4-Bump UCSP/SOT23,
Precision Current-Sense Amplifier
Electrical Characteristics (continued)
(V
RS+
= V
RS-
= 3.6V, V
SENSE
= (V
RS+
- V
RS-
) = 0V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
Note
Note
Note
Note
All devices are 100% production tested at T
A
= +25°C. All temperature limits are guaranteed by design.
V
OUT
= 0. I
CC
is the total current into RS+ plus RS- pins.
V
OS
is extrapolated from measurements for the gain-error test.
Gain error is calculated by applying two values of V
SENSE
and calculating the error of the slope vs. the ideal:
Gain = 25, V
SENSE
is 20mV and 120mV.
Gain = 50, V
SENSE
is 10mV and 60mV.
Gain = 100, V
SENSE
is 5mV and 30mV.
Gain = 200, V
SENSE
is 2.5mV and 15mV.
Note 5:
The device is stable for any external capacitance value.
随着阅读器与标签价格的降低和全球市场的扩大，射频标识 RFID(以下简称RFID)的应用与日俱增。标签既可由阅读器供电(无源标签)，也可以由标签的板上电源供电(半有源标签和有源标签)。由于亚微型无源 CMOS 标签的成本降低，库存和其他应用迅速增加。一些评估表明，随着无源标签的价格持续下降，几乎每一个售出产品的内部都将有一个 RFID 标签。由于无源 RFID 标签的重要性及其独特的工程实现...[详细]
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