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參數(shù)資料
| 型號： | MAX6603ATB+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 5/9頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC COND RTD-VOLT 10-TDFN |
| 產(chǎn)品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 2,500 |
| 類型： | 信號調(diào)節(jié)器 |
| 輸入類型： | 電壓 |
| 輸出類型： | 邏輯 |
| 電流 - 電源： | 5.5mA |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 10-WFDFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 10-TDFN-EP（3x3） |
| 包裝： | 帶卷 (TR) |
Dual-Channel, Platinum RTD-to-Voltage
Signal Conditioner
Detailed Description
The MAX6603 converts a Deutsche Institute for Normung
(DIN) standard 200
Pt RTD to a high-level analog volt-
age without the need for external trims or precise dis-
crete components. The Pt RTD resistance conveys
temperature information approximated by the Callendar-
Van Dusen equation and is represented in Figure 1:
R(T) = RO[1 + AT + BT
2+ CT3]
where:
R(T) = Resistance of Pt RTD at temperature (T)
R0 = Base resistance in ohms at 0°C
T = Temperature in
°C
A = 3.9083 E-3
°C-1 (alpha coefficient 1)
B = -5.7750 E-7
°C-2 (alpha coefficient 2)
C = 0 (approximation for temperatures > 0
°C)
(Alpha coefficients can vary depending on
standards.)
The MAX6603 applies a constant excitation current of
1mA (typ) through the Pt RTD, generating a voltage
drop that is amplified and results in a high-level output
voltage. The excitation current (IEXC) typically varies
ratiometrically by 0.2mA/V (typ) with respect to VCC,
and therefore, the amplified signal is ratiometric to the
power supply. The voltage amplification from input to
output is 5 (typ). The output voltage is applied to a
ratiometric ADC to produce a digital value independent
of supply voltage. For ADCs that use VCC as their refer-
ence voltage, sudden changes in the supply voltage do
not affect the microcontroller’s reading of the tempera-
ture. Ratiometricity simplifies the connection to most
Pin Description
PIN
NAME
FUNCTION
1VCC
Power-Supply Input. Bypass to GND with a 0.1F capacitor as close to VCC as possible.
2
RS2-
Sense Resistor 2 Negative Input
3
RS2+
Sense Resistor 2 Positive Input
4
RS1+
Sense Resistor 1 Positive Input
5
RS1-
Sense Resistor 1 Negative Input
6
GND
Ground
7
DG1
Diagnostic Output Signal 1. DG1 asserts low upon fault detection.
8
OUT1
Output Analog Voltage 1. OUT1 is high impedance upon DG1 assertion.
9
OUT2
Output Analog Voltage 2. OUT2 is high impedance upon DG2 assertion.
10
DG2
Diagnostic Output Signal 2. DG2 asserts low upon fault detection.
—EP
Exposed Pad. Connect to GND.
Functional Block Diagram
MAX6603
RS1+
RS1-
OUT1
AMP
FAULT
DETECT
DG1
HI-V
DETECT
IEXC
ESD
CLAMP
ESD
CLAMP
VCC
RSRC
RS2+
RS2-
OUT2
AMP
FAULT
DETECT
DG2
HI-V
DETECT
IEXC
ESD
CLAMP
ESD
CLAMP
VCC
RSRC
VCC
GND
MAX6603
Maxim Integrated
5
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