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LM74A-3MDA Datasheet

  • LM74A-3MDA

  • SPI/MICROWIRE 12-Bit Plus Sign Temperature Sensor (LM74 in D...

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LM74A SPI/MICROWIRE 12-Bit Plus Sign Temperature Sensor (LM74 in Die Form)
November 2004
LM74A
SPI/MICROWIRE
鈩?/div>
12-Bit Plus Sign Temperature Sensor
(LM74 in Die Form)
General Description
The LM74A is a temperature sensor, Delta-Sigma analog-to-
digital converter with an SPI and MICROWIRE compatible
interface in die form. The host can query the LM74A at any
time to read temperature. A shutdown mode decreases
power consumption to less than 10 碌A. This mode is useful
in systems where low average power consumption is critical.
This particular data sheet applies to the LM74 in die form.
The LM74 is available in the SO-8 package as well as an
5-Bump micro SMD package please refer to LM74 data
sheet for detailed specifictions pertaining to the packaged
parts.
The LM74A has 12-bit plus sign temperature resolution
(0.0625藲C per LSB) while operating over a temperature
range of 鈭?0藲C to +150藲C. The LM74A-5 MDA accuracy of
鹵
3.5藲C is specified over a temperature range of 0藲C to
+150藲C.
The LM74A鈥檚 4.5V to 5.5V or 3.0V to 3.6V supply voltage
range, low supply current and simple SPI interface make it
ideal for a wide range of applications. These include thermal
management and protection applications in hard disk drives,
printers, electronic test equipment, and office electronics.
Applications
n
n
n
n
n
System Thermal Management
Personal Computers
Disk Drives
Office Electronics
Electronic Test Equipment
Features
n
0.0625藲C temperature resolution.
n
Shutdown mode conserves power between temperature
reading
n
SPI and MICROWIRE Bus interface
n
LM74 is also available in a 5-Bump micro SMD and
8-pin MSOP
Key Specifications
j
Supply Voltage
j
Supply Current
LM74A-5
LM74A-3
operating
shutdown
4.5V to 5.5V
3.0V to 3.6V
310碌A (typ)
520碌A (max)
8碌A (typ)
j
LM74A-5 MDA
0藲C to 140藲C
140藲C to 150藲C
鹵
3.0藲C(max)
鹵
3.5藲C(max)
Temperature
Accuracy
Simplified Block Diagram
20017701
MICROWIRE
鈩?/div>
is a trademark of National Semiconductor Corporation.
TRI-STATE
廬
is a registered trademark of National Semiconductor Corporation.
漏 2004 National Semiconductor Corporation
DS200177
www.national.com

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