參數(shù)資料
型號(hào)： MAX1459
廠商： Maxim Integrated Products, Inc.
英文描述： 2-Wire, 4-20mA Smart Signal Conditioner
中文描述： 2線、4-20mA智能信號(hào)調(diào)理器
文件頁(yè)數(shù)： 8/24頁(yè)
文件大?。?/td> 243K
代理商： MAX1459
M
Output Buffer
The output buffer (OUT) can swing within 50mV of the
supply rails with no load, or within 0.25V of either rail
while driving a 10k
load. OUT can easily drive 0.1μF
of capacitance. The output is current limited and can
be shorted to either V
DD
or V
SS
indefinitely. If CS is
brought low, OUT goes high impedance, resulting in
typical output impedance of 1M
. This feature allows
parallel MAX1459 connections, reducing test system
wire harness complexity.
Bridge Drive
Fine FSO correction is accomplished by varying the
sensor excitation current with the 12-bit FSO DAC
(Figure 2). Sensor bridge excitation is performed by a
programmable current source capable of delivering up
to 2mA. The reference current at ISRC is established by
resistor R
ISRC
and by the voltage at node ISRC (con-
trolled by the FSO DAC). The reference current flowing
through this pin is multiplied by a current mirror (AA
12) and then made available at BDRIVE for sensor exci-
tation. Modulation of this current with respect to tem-
perature can be used to correct FSOTC errors, while
modulation with respect to the output voltage (V
OUT
)
can be used to correct FSO linearity errors.
Voltage Drive Sensor
For sensors with negligible FSOTC, the MAX1459 can
be configured as a fixed-voltage drive by shorting ISRC
and BDRIVE. Offset TC can then be compensated with
R
TEMP
. Set configuration register bit 5 to 1, and con-
nect TEMPIN to a temperature-dependent voltage
source. This source can easily be generated by induc-
ing a current through R
TEMP
. For more information on
this application, refer to the MAX1459 Reference Man-
ual.
Digital-to-Analog Converters
The four 12-bit, sigma-delta DACs typically settle in
less than 100ms. The four DACs have a corresponding
memory register in EEPROM for storage of correction
coefficients.
The FSO DAC takes its reference from V
DD
and con-
trols V
ISRC
, which sets the baseline sensor excitation
current. The FSO DAC is used for fine adjustments to
the FSO. The offset DAC also takes its reference from
V
DD
and provides a 1.22mV resolution with a V
DD
of
5V. The output of the offset DAC is fed into the output
summing junction where it is gained by approximately
2.3, which increases the resulting output-referred off-
set-correction resolution to 2.8mV.
Both the offset TC and FSOTC DACs take their refer-
ences from a temperature-dependent voltage. In
default mode, this voltage is internally connected to
BDRIVE. Alternatively, a different temperature sensor
can be used through TEMPIN by setting bit 5 of the
configuration register. This temperature sensor can be
either R
TEMP
or an external temperature resistor.
2-Wire, 4–20mA
Smart Signal Conditioner
8
_______________________________________________________________________________________
2.070
230
1
1
1
7
1.827
203
0
1
1
6
1.584
176
1
0
1
5
1.341
149
0
0
1
4
1.098
122
1
1
0
3
0.855
95
0
1
0
2
0.612
68
1
0
0
1
0.369
OUTPUT-
REFERRED IRO
DAC STEP SIZE
(V
DD
= 5V) (V)
41
PGA
GAIN
(+V/+V)
0
PGA
VALUE
A0
A2
0
0
0
A1
Table 2. PGA Gain Settings and IRO DAC
Step Size
0
0
-9
-63
-1.25
1
1
1
0
-7
-54
-1.08
0
1
1
0
-6
-45
-0.90
1
0
1
0
-5
-36
-0.72
0
0
1
0
-4
-27
-0.54
1
1
0
0
-3
-18
-0.36
0
1
0
0
-2
-0.18
1
0
0
0
-1
0
0
0
0
-0
+9
+0.18
1
0
0
1
+1
+18
+0.36
0
1
0
1
+2
+27
+0.54
1
1
0
1
+3
+36
+0.72
0
0
1
1
+4
+45
+0.90
1
0
1
1
+5
+54
+1.08
0
1
1
1
+6
VALUE
C0
C2
C1
SIGN
+63
OFFSET
CORREC-
TION AT
V
DD
= 5V
(mV)
+1.25
OFFSET
CORREC-
TION
PERCENT
OF V
DD
(%)
1
IRO DAC
1
1
1
+7
Table 1. Input-Referred Offset DAC
Correction Values
相關(guān)PDF資料
PDF描述
MAX1459AAP 2-Wire, 4-20mA Smart Signal Conditioner
MAX1459CAP 2-Wire, 4-20mA Smart Signal Conditioner
MAX1460CCM Low-Power, 16-Bit Smart ADC
MAX1460 Low-Power, 16-Bit Smart ADC
MAX1462 Low-Voltage, Low-Power, 16-Bit Smart ADC
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX14590ETA+ 制造商:Maxim Integrated Products 功能描述:HIGH-CURRENT OVERVOLTAGE PROTECTOR WITH ADJUSTABLE OVLO - Rail/Tube
MAX14590ETA+T 制造商:Maxim Integrated Products 功能描述:HIGH-CURRENT OVERVOLTAGE PROTECTOR WITH ADJUSTABLE OVLO - Tape and Reel
MAX14591EETA+ 制造商:Maxim Integrated Products 功能描述:HIGH SPEED, OPEN DRAIN CAPABLE LOGIC LEVEL TRANSLATOR - Rail/Tube
MAX14591EETA+T 制造商:Maxim Integrated Products 功能描述:HIGH SPEED, OPEN DRAIN CAPABLE LOGIC LEVEL TRANSLATOR - Tape and Reel
MAX14591EEWA+ 制造商:Maxim Integrated Products 功能描述:HIGH SPEED, OPEN DRAIN CAPABLE LOGIC LEVEL TRANSLATOR - Rail/Tube
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*