Datasheet 搜索 > DA转换器 > Maxim Integrated（美信） > MAX5253BCAP+T 数据手册 > MAX5253BCAP+T 其他数据使用手册 3/8 页
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MAX5253BCAP+T 其他数据使用手册 - Maxim Integrated（美信）
制造商:
Maxim Integrated（美信）
分类:
DA转换器
封装:
SSOP-20
Pictures:
3D模型
符号图
焊盘图
引脚图
产品图
MAX5253BCAP+T数据手册
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Figure 2. The association of µP/µC intelligence with the sensor produces an "intelligent" 4–20mA
transmitter.
New low-power low-voltage D/A converters from Maxim meet both requirements for a digitally adjustable
4–20mA current loop: a 3V/5V supply-voltage capability, and internal amplifiers able to control the gate
voltage of an external MOSFET. The only drawback in this configuration is the need to drive an external
n-channel MOSFET, which requires a much higher supply voltage. If not provided on-board, this voltage
must be realized with an external power-boost circuit.
Fortunately, most industrial-control applications provide both high and low voltages for support of 3V/5V
programmable-logic control as well as the sensors (piezoelectric, pressure, temperature, and flow) that
demand voltages as high as 36V (24V typical). As component suppliers adapt to the industry's need for
lower power, the use of common-threshold MOSFETs (controllable by a single +5V power supply) is
spreading rapidly.
You can create a reliable, digitally adjustable 4–20mA current loop by combining an op amp and a
MOSFET with one of the D/A converters in Table 1. Most of these D/A converters have Schmitt-trigger
inputs, which enable a direct interface to the optocouplers in an isolated system.
Table 1. D/A Converters for 4–20mA Current Loops
Model Resolution
VCC
Range
DACs
Power-
On
Reset
Shutdown
Schmitt-
Trigger
Inputs
User-
Program-
mable
Outputs
Internal
Ref
Rail-
to-Rail
Output
Package*
MAX5354 10
5V ±
10%
1
µMAX
MAX5355 10
3.15V
to
3.6V
1
µMAX
MAX5251 10
3V to
3.6V
4
SSOP
MAX5352 12
5V ±
10%
1
µMAX
MAX5353 12
3.15V
to
3.6V
1
µMAX
5V ±
Page 3 of 8
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