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參數(shù)資料
| 型號： | MAX1459AAP+T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | 2-Wire, 4-20mA Smart Signal Conditioner |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO20 |
| 封裝： | 5.30 MM, 0.65 MM PITCH, SSOP-20 |
| 文件頁數(shù)： | 9/24頁 |
| 文件大?。?/td> | 243K |
| 代理商： | MAX1459AAP+T |
First, calculate the ideal IRO correction voltage using
the following formula, and select the nearest setting
from Table 1:
where IROideal is the exact voltage required to perfect-
ly null the sensor, O(T1) is the sensor offset voltage in
V/V at +25°C, and VBDRIVE(T1) is the nominal sensor
excitation voltage at +25°C. In this example, 30mV
must be subtracted from the amplifier front end to null
the sensor perfectly. From Table 1, select an IRO value
of 3 to set the IRO DAC to 27mV, which is nearest the
ideal value. To subtract this value, set the IRO sign bit
to 0. The residual output-referred offset error will be
corrected later with the offset DAC.
Determining OFFTC COEF Initial Value
Generally, OFFTC COEF can initially be set to 0 since
the offset TC error will be compensated in a later step.
However, sensors with large offset TC errors may
require an initial coarse offset TC adjustment to prevent
the PGA from saturating during the compensation pro-
cedure as temperature is increased. An initial coarse
offset TC adjustment is required for sensors with an off-
set TC greater than about 10% of the FSO. If an initial
coarse offset TC adjustment is required, use the follow-
ing equation:
OFFTC COEF
4096
V
T
V
T
2.3
4096
OTC
FSO
TCS
V
2.3
4096
-1000ppm/ C
4V
-2100ppm/ C
2.5V
2.3
OUT
BDRIVE
=
()
()
°
()
°
x
xx
x
T
xx
x T
xx
1357
IROideal
- O T1
V
T1
- 0.012V/V
2.5V
- 30mV
BDRIVE
=
()
[]
=
()
=
x
MAX1459
2-Wire, 4–20mA
Smart Signal Conditioner
______________________________________________________________________________________
17
MAX1459
12-BIT
D/A
-
OFFSET
TC
12-BIT
D/A
-
OFFSET
CONFIGURATION
REGISTER
12-BIT
D/A
-
FSO
COARSE
OFFSET
(IRO
DAC)
12-BIT
D/A
-
FSOTC
RNBIAS
= 402k
1%
A = 1
VSS
+5V
OUT
VDD
DIGITAL
INTERFACE
PGA
CS
WE
SCLK
DIO
BDRIVE
INM
ISRC
INP
C2
0.1
F
C1
0.1
F
VSS
RISRC
RFTC
RISRC
RFTC
128-BIT
EEPROM
VDD
Σ
SENSOR
SELECT
OUTPUT
AMPOUT
AMP-
AMP+
R
TEMP
TEMP1
TEMP2
TEMPIN
NBIAS
Figure 13. Basic Ratiometric Output Configuration
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1459CAP+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX1459CAP+T | 制造商:Maxim Integrated Products 功能描述:SMART SGNL CONDITIONER 20SSOP - Tape and Reel |
| MAX1459CAP-T | 制造商:Maxim Integrated Products 功能描述:#EMPTY - Tape and Reel |
| MAX145ACPA | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX145ACPA+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 108ksps 5.25V High Speed ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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